Sx-1250 Service Manual (hi-res) c3t4d
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AM/FM STEREO RECEIVER
s
-1250 < ART-158-0>
- ·'-
'
Q.,, PIONEER®
SX-1250
4. CIRCUIT DESCRIPTIONS 4.1 TUNER SECTION FM Front End The FM front end is composed of a tuning circuit employing a 5-gang variable capacitor, a 2-stage RF amplifier and mixer employing dual gate MOS FETs, and a local oscillator with buffer. An equivalent of a cascode amplifier is produced by AC grounding gate-2 of the dual gate MOS FET, allowing stable RF amplification at high gain. The output signal of the RF amplifier is applied to gate-1 of the mixer stage MOS FET, while the local oscillator output signal is applied to gate-2. This technique minimizes input power from the local oscillator, resulting in low mutual interference even if the received signal input level is high. A variation of a Clapp circuit forms the local oscillator. Inclusion of a buffer amplifier between local oscillator and mixer reduces local oscillator load, eliminating distortion of the oscillation waveform. Drawing effect of the local oscillator is also eliminated.
FM IF Section Four integrated circuits (ICs) and four dual element ceramic filters compose this section. HA1201 (diagram on page 56) is a differential amplifier with a constant current source and functions as a current-limiting limiter. HA1137 (diagram .on page 55) contains IF limiter amplifier, quadrature detector, meter drive and muting circuits. The detector circuit contained within this IC is not used in the SX-1250 however, and instead the IF signal is taken from the stage prior to the detector and applied to TA7061AP. This latter IC is a 3-stage differential amplifier (diagram on page 56) and its output goes to the ratio detector for FM detection.
2nd RF amp
'-¢-+-+-Juarr~
r
FM 300 Q BAL. L
Mixer
Fig. 1. Circuitry of FM front end
IF il
- -o-- _.,
15
1--- -- - - - - - - - - - - - - - - - -- --
Fig. 2.
-o-SIGNAL meter
Block diagram for HA 1137
J
11
MODEL SX-1250 COMES IN THREE VERSIONS DISTINGUISHED AS FOLLOWS: Voltage
Type
Remarks
KCU
120V o n ly
CSA (Canada) and UL (U.S.A) approved with de-emphasis selector switch (25~ots/ 75J.'S)
HG
220V and 240V (Switchable)
SEMKO (Sweden), NEMKO (Norway), DEMKO (Denmark) and El (Finland) approved
11 OV, 120V. 220V and 24 0V (Switchable)
General export model with de-emphasis selector switch ( 25~ots / 501's/ 751's)
s
I•
When repairing S or HG type, please see the manual on page 101 .
CONTENTS 1.
SPEC! FICATIONS
4
2.
FRONT FACILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. 4
3.
CONNECTION DIAGRAM
9
4.
CIRCUIT DESCRIPTIONS 4.1
Tuner Section
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2
Audio Section
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3
Protection "Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4
Power Supply Circuit
5.
LEVEL DIAGRAM
6.
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.
DISASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.
PARTS LOCATION
9.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.1
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.2
Rear View
8.3
Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.4
Bottom Vrew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.5
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
ADJUSTMENTS 9. 1
AM Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~-
9.2
FM Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.3
Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9.4
Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 38
. . . . . . . . . . . . . 36
10.
DIAL CORD STRINGING
11 .
EXPLODED VIEWS ....................... .... ................. .. ... .. . 40
12.
SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTS 12.1
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Miscellaneous-parts
.. .. ....... ... ............ ...... ... . .... ..... . 39
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
SX-1250
12.2
Schematic Diagram
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.3
Internal Circuitry of Integrated Circuits
12.4
The Circuit of FM Front End (AWB-023) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
12.5
Tuner Assembly (AWE-068) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
12.6
De-emphasis Switch Assembly (AWX-099) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
12.7
Equalizer Amplifier Assembly (AWF-021) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
12.8
Function Switch Assembly (AWS-094) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
12.9
Flat Amplifier Assembly (AWG-042)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
12.10 5P Connector Assembly (AWX-062) . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . 75 12.11 Control Amplifier Assembly (AWG-041)
................................ 76
12.12 Filter Amplifier Assembly (AWM-089) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 12.13 Microphone Jack Assembly (AWX-097) . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . 83 12.14 Power Amplifier Assembly (AWH-048) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 12.15 Speakers Switch Assembly (AWS-095) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 12.16 Protection Circuit Assembly (AWM-091) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 12.17 Stabilizer Assembly (AWR-106) ....................................... 93 12.18 PowerSupplyAssembly(AWR-107) ......................... .. ......... 96 13.
PACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
14.
PARTS LIST OF EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
15.
SUPPLEMENTS FOR SX-1250/HG AND SX-1250/S
-
15.1
Contrast of Miscellaneous-parts ........ ... ........ . .................... 101
15.2
Schematic Diagram for SX-1250/S ........ . ............... . .. . .. . . . .. . . 103
15.3
Schematic Diagram for SX-1250/HG .... .. . . ...... ........ .. . . .. ... . .... 105
15.4
De-emphasis Switch Assembly (AWX-101, for S type) ...................... 107
15.5
Speakers ~wttch Assembly (AWS~098, for HG type) . ................ . ...... 108
15.6
Power Supply Assembly (AWR-108, for HG type) ......................... 110
3
1. SPECIFICATIONS Semiconductors FETs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 6 82 60
Power Amplifier Section Continuous Power Output from 20 Hertz to 20,000 Hertz (Both channels driven).. 160 watts per channel (8 ohms) 200 watts per channel (4 ohms) Total Harmonic Distortion (20 Hertz to 20,000 Hertz, from AUX) Continuous Rated Power Output. .. No more than 0.1% 80 watts per channel power output, 8 ohms . . . . . . . . . . . No more th an 0.05% 1 watt per channel power output, 8 ohms . . . . . . . . . . . No more th an 0.07% lntermodu lation Distortion (50 Hertz: 7,000 Hertz= 4: 1, from AUX) Continuous Rated Power Output... No more th an 0.1% 80 watts per channel power output, 8 ohms . . . . . . . . . . . No more than 0.05% 1 watt per channel power output, 8 ohms . . . . . . . . . . . No more than 0.07% Frequency Response . . . . . . . . . 5Hz to 100,000 Hz ~?d B Input Sensitivity/I mpedance POWER AMP IN . . . . . . . . . . . . . . . . 1 V/50k ohms Ou t pu t Speaker . . . . . . . . . . . . . . . . A, B, C, A+B, B+C, A+C Headphone . . . . . . . . . . . . . . . . . . . Low Impedance Damping Factor (20Hz to 20,000HL, 8 ohms) ...... . . . . . . . . . . 30 Hum and Noise (IHF , short-circuited, A Net wor k) .. 100dB
Preamplifier Section Input Sensitivity/ Impedance PHONO 1 . . . . . . . . . . . . . . . . . . 2.5mV/50k ohms PHONO 2 . . . . . . . . . . . . . . . . . . 2.5mY/50k ohms MI C . . . . . . . . . . . . . . . ....... 6.5mV/50k ohms AUX . . . . . . . . . . . . . . . . . . . . . . 150mV/50k ohms TAPE PLAY 1 ... ........ .... 150mV/50k ohms TAPE PLAY 2 . . . . . . . . . . . . . . . 150mV/50k ohms TAPE PLAY 2 (DI N connector) .... 150mY/50k ohms PHONO Overload Level (T.H.D. 0.1%) PHONO 1 . . . . . . . . . . . . . . . . . . . 500mV (1k Hz) PHONO 2 . . . . . . . . . . . . . . . . . . . SOOmV (1kHz) Output Level / Impedance TAPE REC 1 . . . . . . . . . . . . . . . . . . . . . . . 150mY TAPE REC 2 ...... .. . . . . . . . . . . . . . . . 150mV TAPE REC 2 (DIN connector) .... 30mV/80 k ohms
4
PRE OU T I V/ 1k ohm~ I OtJ I Ht~ rmonic Distortion (20Ht o t 20,000H7, 1 V ou t put) .. No more than 0.02% Frcquency Response PIIONO (R IAA equal i;ation) . .30H; to 15,000Ht ± 0.2dB AUX, TAPE PLAY . .. . . . . . I OHz to 50,0001lt •?d B Tone Control BASS . . . . . . . . . . . . . . . . . MA IN ±10dB ( I OOilz) SUB ± 5dB ( SOH1) TREBLE . . . . . . . . . . . . . . . MA IN ± I Od B (IOkllz) SUB ± Sd B (20k Hz) Filter LOW . . . . . . . . . . . . . . . . . . .... 30Hz ( 12dB/oct.) HIGH . . . . . . . . . . . . . . . . . . . . . 8kH1 (12dB/oct.) Loudness Contour (Volume control set at 40dB position) ..... +-6dB (1 OOHL). +3dB ( I OkH;) Hum and Noise (IHF , short-circu ited, A Network, rated power) PHONO . ....... . . . . . . . . . . . .... . .... 75dB AUX, TAPE PLA Y . . . . . . . . . . . ... ...... 90dB Muting . . . . . . . . . . . . . . . . . . . . . .. ...... - 20d8
FM Section Usable Sensiti vity ... MONO ... 8.7dBf (3.0pV/300Q) STE REO. . 14.5d Bf (5 .SpY /300Q) Usable Sensitivity (I HF '58)... . . . . . . . . . . . . . 1.5pV SOdB Quieting Sensitivity ... . MONO ... 11.5dBf(4.1pV/300Q) STEREO. . 36.0dBf (69pV/ 300U) Signal-to-Noise Ratio at65dBf .. MONO ....... 80dB STEREO . . . . . 74d B Di stortion at 65dBf 1OOHL ..... MONO. . . . . . . 0.1 % STEREO . .... 0.25% 1kHz ...... MONO. . . . . . . 0. 1% STEREO . . . . . 0.2% 6kHt ...... MONO. . . . . . . 0.3% STEREO . .... 0.3% Frequency Response ........ 30Ht to 15,000HL +?:~dB Cap ture Ratio ... . . . . . . . . . . . . . . . . . . . . . . . l.OdB Alternate Channel Selectivity ....... . ........ 83dB Spurious Response Ratio . . . . . . . . . . . .. . .... 11 Od B Image Response Ratio . . . . . . . . . : . . . . . . . . . . 110dB IF Response Ratio . . ..... . . . . . . . . . . . . . . . 120dB AM Suppression Ratio . . . . . . . . . . . . . . . . . . . . 60dB Muting Threshold . . . . . . . . . . . . . 13dBf (4.9tN/300Q) Stereo Separation . . 50dB (1k Hz), 35 dB (30Hz -15kHz) Subcarrier Product Ratio . . . . . . . . . . ........ 74dB SCA Rejection Ratio . . . . . . . . . . . . . ... . . ... 74dB Antenna Input . . . . . . . . . . . . . . . . 300 ohms ba lanced 7 5 ohm~ u nbalanccd
SX-1250
AM Sec tion (IHI , f errite antenna) .. . ....... 300JJ.V/m (IH r, [xt. antenna) . . . . . . . . . . . . . . 15JJ.V Selectivity .... .... ....... . . .. . . ....... 40d8 Signa l-to-Noise Rati o ....... .. . . . . . . . . . . . . 55d8 l mc~ge Response Ratio .. . .. . .. . ........... 65d8 Ir Respo nse Ratio . . . . . . . . . . . . . . . . . . . . . . . 85d 8 Antenna ........... Built-in Ferrite Loo pst ick Antenna Sen~iti vity
Miscellaneous Powe1 Requ irements . . . . . . . . . . . . . . . . . 120V 60Hz Powe1 Consumption . . . ............ 650W (UL, CSA) 1200W (max.) Dimensions . . ... . .. 556(W) x 186.5(H) x 464.5(0) mm 21-7/8(W) x 7-3/8(H) x 18-1/4(0) in Weight Without Package .......... . 29.2kg (64 lb 4 oz) With Package ......... . . . .. 33.2 kg (73 lb 1 oz) Furnished Parts rM T-type Antennc~ Opel at ing Instruct ions . . . . . . . . . . . . . . . . . ..... . Hex. Wrench .......... . ....... . . . . . . . . . . . . NOTE:
Specifications and the design subject to possible modification without notice due to improue men ts.
HEX WRENCH The accessory Hex. wrench is provided for removing the VOLUME and TUNING knobs, or for tightening its setscrew in the event it becomes loose. If required, loosen the setscrew by inserting the wrench into the hole on the side of the knob and turning t he wrench counterclockwise. Be particularly careful not to scratch t he front when emp loying t he wrench.
5
2. FRONT FACILITIES FUNCTION SELECTOR BUTTONS To select the program source, push each button as fol lows: NOTE: Only one FUNCTION button should be depressed at a time.
PHONO 1
To operate a turntable connected to the PHONO 1 input jacks.
AUX
For listening to audio component (cartridge tape player, TV sound tuner, etc.) connected to the AUX input jacks.
AM ......... For AM broadcast reception.
AM
FM
PHON01
PHON02 / MIC
AU)(
L-
FM
For FM stereo reception. Automatically receives monophonically during FM monophonic broadcasts. The STI: RLO indicator li ght ~ Ufl when the br oJclcJ~t i~ in stereo.
TAPE DUPLICATE SWITCH Set this switch in the ON (down} pos1t1on to duplicate or edit a recorded tape using two tape decks.
PHONO 2/MIC. As above for PHONO 2 jacks, or for reproduction through microphones connected to the MIC iack is on the front . Note, when the microphone is connected to the jack the turntable connected to the PHON02 jacks cannot be used.
r TAPE -----, OUPl.IC ATE M O NITOR 1
AOAPTO~
2
0~ 09 0~ 0~ J
TAPE MONITOR (1, 2) SWITCHES Set these switch in the ON (down} position as fol low: 1 . . . . With a tape deck connected to the T API::. jacks (REC and PLAY), either playback or monitoring of a recording in progress are possible. 2 . . . . Same as in 1 above, with a tape deck connected to the TAPE 2 jacks (REC and PLAY) .
ADAPTOR SWITCH When employing adaptor components, such as a graphic equalizer adaptor, RG processor, or Dolby N R adaptor, depress this ADAPTOR switch to ON.
For normal use, leave in the OFF (up) positions.
VOLUME CONTROL AND AUDIO MUTING
SWITCH The extremely high P,Ower output of the SX-1250 can be finely controlled by combining the calibrated VOLUME control and the AUDIO MUTING switch. The AUDIO MUTING switch can also be used to briefly lower the volume when changing records or tapes.
6
22
2
18
34·18, ~ ~,·'''•/~
110
40 ~~ 48 -
~·
~
MUTING
B B
54 •
62
.
70 ~
0 -dB
VOLUME
'
2
~ .
' 4 - 20d8
•
SX-1250
SPEAKER BUTTONS Three sets of speaker terminals, A, B, and C, are provided on the rear , and the required speaker systems can be se lected by depressing the SPEAKERS buttons as follows: A ........... Speaker systems A operate B . . . . . . . . . . . Speaker systems B operate C ... ·: . . . . . . . Speaker systems C operate NOTES: 1. When any two buttons (A+B, B+C, C+A) are depressed simultaneously, the corresponding pairs of speaker systems will come into operation. Howeuer, it is not possible to operate all three speaker systems at the same lime, euen though all the bu tlons are depressed. 2. For priuate listening through headphones, return all the SPEAKERS buttons to the OFF (undepressed) position.
FM TUNING METER With the SIGNAL meter needle deflected to the right, make fine adju stment by centering the FM TUNING meter needle (indicating optimum reception).
FM MUTING BUTTON Leave this button undepressed (in the ON position) to suppress unpleasant interstation noise while tuning between FM stations. Low-strength signa ls may also be suppressed by this function, so to pick up a weak station depress this button to the OFF position.
SIGNAL METER For AM and FM station tunings. AM tuning: Tune for maximum deflection of the SIGNAL meter needle to the right. FM tuning: Both the SIGNAL and FM TUNING meters wo rk together. The optimum point of the SIGNAL meter needle is the same as in AM tuning. Then use the FM TUN ING meters.
PROGRAM SOURCE INDICATOR
SPEAKER SYSTEM INDICATOR FM STEREO INDICATOR
l
PHONES JACK Accepts stereo headphones.
TUNING KNOB Select the station and tune for optimum reception by observing the SIGNAL meter for AM stations, and both SIGNAL and TUN lNG meters for FM stations.
1
r
r
I
,
rr r
MIC JACKS (L and R) For connect each channel jacks the left and right channel microphones.
0
U
•o
10
U
9C>
Ill
10
Ill
111
.J(. IU
I ~(
•0
NOTE: Use the high impedance (aboue 20kn.) with 6mm diam. phone plugs.
1
- - - --. -,-qz_,t_9.!::4=I~"~II?EI ---~1---:~;:--------,-,al,-,-.~ ..!~,9=6=,=98=-,=I=OO=,=I=OZ=I: :!.l.g_-14-,-I0-6-,-,\,2-;8-,-------~~ . AM
,/
,~
,. 1Qkl-ll
WARNING: Do not plug a microphone into the PHONES jack as may damage the microphone.
POWER SWITCH After turning this switch ON there is a delay of some 6 to 8 seconds, during which time the protection circuit operates to eliminate unpleasant noise. TWIN BASS CONTROLS Adjust low frequency tone. 100Hz: Adjusts frequency band below 400Hz. Control effectiveness at 100Hz is ±10dB. 50Hz: Provides additional co ntrol for the frequency band below 200Hz. Control effectiveness at 50Hz is ±5dB.
TONE SWITCH In the OFF {up) position, this switch causes the amplifier section to operate with a flat frequency respo nse regardless of the tone control setting.
JlU~ HIGH CUT (8kHz) FILTER BUTTON When high frequency scratch noise (from worn records or other source) is unpleasant, depress this button to provide 12dB/octave attenuation at frequencies above 8kHz. If there is no interference, release this button.
I
VOLUME CONTROL Adjusts output level to speakers and headphones. Scale is graduated in dB, and when used in conjunction with the MUTING switch, finer and wider range attenuation can be performed. See additional description on page 6. AUDIO MUTING SWITCH - 20dB Depress this switch to attenuate the aud io output by 20dB. This conven ient feature saves having to disturb the VOLUME control, for example when answering the telephone.
- ... +
LOW CUT (30Hz) FILTER BUTTON When low-pitched rumble (from turntable motor or other source) is obstrusive depress this button to provide 12dB/octave, attenuation at frequencies below 30Hz. If no interference is experienced, release this button.
)
FM MULTIPATH BUTTON When selecting the best position for the FM antenna, depress this button so that multi path noise is heard from the speaker systems. To listen to FM broadcasts, release this button. TWIN TREBLE CONTROLS Adjusts high frequency tone. 10kHz: Adjusts frequency band above 2.5kHz. Control effectiveness at 10kHz is +lOdB. 20kH7: Provides additional control for the frequency band above 5kHz. Control effectiveness at 20kHz is +5dB.
LOUDNESS SWITCH Depress this switch when listening at low volume. The frequency .response of the human ear varies according to the listening volume, and the depressed position compensates for hearing response by emphasizing the bass and treble. MODE SWITCH For stereo playback, leave this switch undepressed (or depress to release, if already depressed). When depressed for MONO playback, left and right channel stereo signals will be mixed to produce monophonic sound from both speaker systems. BALANCE CO NTROL Adjusts the balance between the sound vol ume from the left and right speaker systems or headphones.
B
3. CONNECTION DIAGRAM TURNTABLE
TAPE DECK (open-reel , cassette)
TURNTABLE
TAPE DECK (Open-reel, cassette)
DOLBY NR ADAPTOR
--
-
4 CH A NN EL DISCRETE FM ADAPTOR
~
:.)o D EJ 0
LINE "INPUT
LINE OUTPUT
LINE INPUT
OUTDOOR FM ANTENNA
LINE OUTPUT
LINE IN PUT
LINE OUTPUT
PRE/POWER AMP The brrdge connectrng plugs between PRE OUT and POWER IN jacks shou ld always be left rn posrtron rn normal use. I I they are diSConnected or removed, no sound wrll come fro m the speakers. Always be sure to switch off the power supply before attempting to remove them .
T -TYPE FM ANTENNA c~UIION
~J ~JI
Rt MOH
I~'
ll..>llll SCJ ..... MA:>e
CONVENIENCE OUTLETS Unswitched: Less frequently used components, which do (200W max.) not requ ire coupled power, can be p lugged into either of these outlets.
""'*S""tTt:,..£0
SV'~
300!1 feeder
Sll 801 10M NOI Ct
IO,.,L~W ..... oAll.
Switched: (SOW m ax.)
AM ANTE NNA (Indoor or Outdoor)
GND
"j
'
!"
, r-..
:
;;.
FM DE-EMPHASIS SWITCH Normally, set this swi tch to "75JJs" . Be sure to set it to "25~ts" only when listening to an FM broadcast (pre· emphasis; 25~tsec . ) w i th a Dolby • system NR adaptor con· nected between the ADAPTOR OUT and ADAPTOR IN terminals.
*
8
I he word "Dolby" is a trademark of Dolby Laboratories I nc.
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IL
I
' II
'·· R IGHT
LEFT
SPEAKER SYSTEMS A
RIGHT
"
fi
f;
"iL, !(
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~
' LEFT
SPEAKER SYSTEMS B
RIGHT
LEFT
SPEAKER SYSTEMS C
A frequ en tly used component (turntable, tape deck, etc.) can be plugged into this outlet. By leaving the power switch of that component in the ON position, power supply to the component will be coupled w ith the SX-1250 swi tch operation.
SX-1250
4. CIRCUIT DESCRIPTIONS 4.1 TUNER SECTION FM Front End The FM front end is composed of a tuning circuit employing a 5-gang variable capacitor, a 2-stage RF amplifier and mixer employing dual gate MOS FETs, and a local oscillator with buffer. An equivalent of a cascode amplifier is produced by AC grounding gate-2 of the dual gate MOS FET, allowing stable RF amplification at high gain. The output signal of the RF amplifier is applied to gate-1 of the mixer stage MOS FET, while the local oscillator output signal is applied to gate-2. This technique minimizes input power from the local oscillator, resulting in low mutual interference even if the received signal input level is high. A variation of a Clapp circuit forms the local oscillator. Inclusion of a buffer amplifier between local oscillator and mixer reduces local oscillator load, eliminating distortion of the oscillation waveform. Drawing effect of the local oscillator is also eliminated.
FM IF Section Four integrated circuits (ICs) and four dual element ceramic filters compose this section. HA1201 (diagram on page 56) is a differential amplifier with a constant current source and functions as a current-limiting limiter. HA1137 (diagram on page 55) contains IF limiter amplifier, quadrature detector, meter drive and muting circuits. The detector circuit contained within this IC is not used in the SX-1250 however, and instead the IF signal is taken from the stage prior to the detector and applied to TA7061AP. This latter IC is a 3-stage differential amplifier (diagram on page 56) and its output goes to the ratio detector for FM detection.
2nd RF amp
~OOfrr~
r
FM 300 Q BAL. L
Miur
Fig. 1. Circuitry of FM front end
IF i1
~-o---l
15
Fig. 2.
Block diagram for HA 1137
J
11
Multiplex Decoder The multiplex decoder contains three sections and employs an IC (HA1196) with a block diagram as shown in Fig. 3 (see page 55 for circuit). 1. Switching Signal Generator A PLL {phase locked loop) system is employed. 76kHz is generated by the VCO (voltage controlled oscillator: an oscillator in which frequency is controlled by a voltage) and converted into 38kHz by a frequency divider, then divided again to become 19kHz. This signal and the stereo pilot component (19kHz) of the detected signal are applied to a phase comparator where the difference between them is converted into a voltage. By this voltage is applied to the VCO. And the oscillator sigl)al is locked to the pilot signal. This loop is termed PLL and a 38kHz switching signal synchronized to the pilot signal is obtained and employed as a switching signal.
2. Automatic stereo detector With the PLL locked to the pilot signal, the pilot signal and a 19kHz signal of the same phase are produced. A voltage is then obtained at the phase comparator that is proportional to the pilot signal amplitude. As it increases, the lamp lights and the switch becomes on. The switching signal is applied to the demodulator.
Composite SifUI
-¢-
However, if the FM muting signal is also applied to pin 12, the detector circuit becomes disabled (grounded). Therefore a switching signal to the demodulator is not supplied and mono reproduction is obtained. 3. Demodulator Two differential amplifiers are employed in a switching circuit (Fig. 4). The composite signal is applied to the base of Q3. Q1 and Q2 are alternately switched ON and OFF by the switching signal. The composite signal amplified at Q3 is demodulated by the switching of Q1 and Q2. Q6 and Q3 are loosely coupled at their emitters by R1, R2 and R3. Q6 is driven in opposite phase to Q3 and its low level composite signal output is demodulated by switching of Q4 and Q5. The demodulated signals in opposite phase are combined at the collectors of Q1 and Q2, cancelling crosstalk. Adequate current flow is required in Q3 and Q6 for low distortion. However, if the base bias voltage is raised, the voltage range available at the collector is reduced and clipping occurs (power supply voltage is limited by IC voltage requirement). For this reason, current from an external source is inserted at Q3 and Q6 collectors and become I1 and 12 in Fig. 4. The same amount of current is removed at the emitters of Q3 and Q6 to become 13 and 14 in Fig. 4. Q3 and Q6 therefore operate with adequate current and distortion in this stage is remarkably reduced. A amplifier amplifies the demodulated signal to produce the IC outputs.
+l
I
_ _ _ _j Lch
o•tprt
Sepa. adj.
STEREO
Rch
output Fig. 3. Block diagram for HA 1196
12
indicator
SX-1250 Multipath Monitor Circuit
When multipath reflections exist in the received signal, the signal is converted into AM and PM (amplitude modulation and phase modulation) forms. Since the amplitude of the actual FM signal is fixed, by converting this AM component into a sound and listening to it, the existence (and amount) of multipath reflection can be determined. Short term level variations (audio frequency) are taken as a signal from HA1137 SIGNAL meter drive terminal (pin 13). By setting the FM MULTIPATH switch to ON during FM reception, this signal becomes connected to the audio amplifier and can be heard as a sound which indicates conditions of multipath reflection.
+ Vee
Fig. 4. Basic circuitry of demodulator
FM Muting Circuit (Fig. 5) DC voltage emerges from pin 12 of IC (HA1137) in the event of more than ±70kHz detuning or low input level (less than' 4. 9J..L V antenna input conversion). This is employed for shorting the AF output circuit to perform muting by the reed relay.
AM Tuner The AM tuner employs a 3-gang variable capacitor and an IC (HA1138) with 1-stage of RF and 2-stage of IF amplification. Fig. 6 shows the HA1138 block diagram (see page 55 for circuit).
Af output circuit HA1137
Schmitd circuit
-!-Jr I
Reed + Vee, relay
I Fig. 5. Circuitry of FM muting
10
Af outpwt
:. .___ ___________ ------- ___/
SIGNAL meter
Fig. 6. Block diagram for HA 1138
13
4.2 AUDIO SECTION Equalizer Amplifier The equalizer amplifier is shown in Fig. 7. The first stage (Ql & Q2) is a PNP transistor unbalanced differential amplifier. High voltage gain is provided in the following stage (Q3) by a bootstrap circuit (Cl & Rl). The output stage (Q4 & Q5) is a complementary symmetrical SEPP circuit. The high voltage utility factor of the SEPP circuit provides a high maximum output voltage. Dynamic range of the equalizer amplifier is therefore wide and overload input level at 0.1% distortion is 500mV (rms at 1kHz). Equalizer elements (C2, C3, R2, R3) are polystyrene film capacitors with tolerances within ±1% and metal film resistors with tolerances better than ±1%. These lead to a deviation with respect to the RIAA playback standard within ±0.2dB. Due to the balanced plus and minus power supply, the input and the output points become essentially OV, reducing click noise during FUNCTION switch operation.
The TAPE MONITOR 1 switch selects between the program source selected by the function switch and the input at the TAPE. 1 PLAY jacks (Fig. 9). The TAPE MONITOR 2 switch selects between the signal selected by the TAPE MONITOR 1 switch and the input at the TAPE 2 PLAY jacks (Fig. 9). TAPE 1 PLAY
TAPE 2 PLAY
J
FunctiDII switch
011! TAP£ IIIOIIITOR 2 switch
TAPE MONITOR 1 switch
Fig. 9. Tape monitor circuit
When the DUPLICATE switch is set to ON, the TAPE 1 REC jacks are connected to the TAPE 2 PLAY jacks, and the TAPE 2 REC jacks to the TAPE 1 PLAY jacks (Fig. 10). TAPE 1 REC PLAY
@
@
TAPE 2 REC PLAY
@
@
+ Vee ------ DUPLICATE switch
Output H~--+-+--+-.--tt--0
Vee Fig. 7. Schematic diagram for Equalizer amplifier
Fig. 10. Tape duplicate circuit
The signal selected by the TAPE MONITOR 2 switch appears at the ADAPTOR OUT jacks (Fig. 11). The ADAPTOR switch selects between the signal selected by the TAPE MONITOR 2 switch and the input at the ADAPTOR IN jacks (Fig. 11). ADAPTOR
Tape and Adaptor Circuits With the DUPLICATE switch OFF, the program source selected by the function switches are obtained at the TAPE REC jacks (Fig. 8). TAPE 1 REC
@
Function
TAPE 2 REC
@ --- DUPLICATE switch
o--.______...___
switch
Fig. 8. TAPE REC jacks
14
OUT
@
TAPE IIIOIIITOR 2
switch
IN
1
o-----_j----A-'DA!1'PT~OR>--switch
Fig. 11 . ADAPTOR jacks
MODE Switch When the MODE switch is set to the MONO position, the left and right channels are shorted in the stage following the tape and adaptor circuits.
SX-1250 BALANCE Control
A no-loss HB type variable resistor at center position is employed. An SEPP circuit is inserted as a buffer in the following stage. Muting Circuit
When the MUTING switch is set to the - 20dB position, the signal is attenuated by 20dB. Loudness Circuit This circuit is operated ON or OFF by the LOUD-
NESS switch and is intended to compensate for audibility characteristics of the human ear at low volumes. The VOLUME control variable resistor is tapped. Connecting a CR network at this point enhances low and high frequencies at low volumes. Tone Controls
Twin tone controls are employed with the SX1250. These consist of ultra-low and ultra-high (sub) controls in addition to the conventional BASS and TREBLE (main) controls. The signal is amplified to required level by a 2-stage FET and transistor direct coupled amplifier, after which a 2-stage NFB type tone control circuit is provided. The sub controls form the first stage and the main controls form the second stage of this circuit. With NFB type tone controls, C-B is applied to a single transistor amplifier. Frequency response becomes variable by providing selectivity in the circuit. The basic circuit of this stage is shown in Fig. 12.
R4
VR 2
R•
Fig. 12. Basic circuitry of N FB type tone control circuit
Midrange Operation The C1 and C2 reactances are considerably smaller than VR1 at frequencies above midrange, effectively shorting VRl. At frequencies below midrange, C3 reactance becomes large and in effect, opens the circuit. Consequently, the circuit becomes equivalent to that shown in Fig. 13 with respect to the midrange. In this figure, the circuits parameters are not changed by any change in position of the VR1 and VR2 sliders. The NFB amount is therefore fixed and the circuit gain is also fixed without regard to VR1 and VR2 slider positions.
R.
VR 2
R.
Fig. 13. Midrange operation of N FB type tone control circuit
Low Frequency Operation The reactance of C1 and C2 increases at low frequency to form a circuit as shown in Fig. 14. This reactance increases in proportion to the frequency declines. Also, the NFB amount varies greatly according to VR1 slider position. The circuit gain at low frequencies can therefore be varied by VRl.
C,
C2
Ra
R, Fig. 14.
VR ,
R.
Low frequency operation of NFB type tone control circuit ·
High Frequency Operation The considerably smaller reactance of C1 and C2 at high frequency in comparison with VR1 effectively shorts VR1 to from an equivalent circuit such as that shown in Fig. 15. C3 reactance decreases in , the same degree that the frequency increases and the NFB amount is now mainly controlled by the VR2 slider position. Consequently, the gain at high frequencies can be varied by VR2.
YR, R,
R4 Fig. 15.
YR 2
R,
High frequency operation of N FB type tone control circuit
15
Tone Defeat Circuit By setting the TONE switch to OFF, the above described tone control circuit becomes byed. Filter Circuits (Fig. 16) These are NFB type active filters with - 12dB/ octave slopes. The circuit combines a 2-stage CR element and emitter follower. Normal function of the emitter follower is provided in the band and by 100% NFB, gain becomes essentially "1". NFB is cancelled in the area of the cutoff frequency, composing a peak in the frequency response. This leads to improved and sharper CR filter response. In the actual circuit, CR elements for low and high filters both employ the same emitter follower and each can be selected ON-OFF. Power Amplifier Fig. 17 shows the power amplifier section. The input stage is composed of Q1 & Q2 differential amplifier, with the input signal applied to Ql. Q3 & Q4 differential amplifier comprise the second stage, with Q3 output composed at Q4 by Q5 & Q6 current mirror. Connecting collector and base of Q5 produces the equivalent of a diode. Q3 collector current produces a · forward voltage between Q5 base and emitter, biasing Q6. R1 and R2 in this circuit are equal, while Q5 and Q6 are the same type transistors. Consequently, when voltages between bases and emitters of Q5 & Q6 are equal, current flows in these transistors also become equal. This results in equal current flows in Q3 and Q6. Mutually opposite phase signals drive Q3 and Q4, resulting in mutually opposite phase collector currents. Q4 and Q6 therefore operate as push-pull.
-IZdB/oct
z
UJ
1-
~
-12 dB/oct
~~~··
z:
w
I-
Compos1!e curve
tt
~---------~
Fig. 16. Basic circuitry of filters
Power stage bias voltage is supplied by the voltage drop across D1, D2 and VR2. VR2 is a semi-fixed resistor for power stage bias adjustment, while D1 and D2 are Varistors for temperature compensation. A 3-stage Darlington connection is employed in the power stage (Q7-Q14), with output transistors Qll- Q14 in a complementary symmetrical parallel
Output
''~1
Ycc , o-- _ ___.__ _____,.__..___ _ _ ___,
.___,_---.~1----<1>-------0
Fig. 17. Schematic diagram for pow er amplifier
16
HIGH rllTIR switch
Ycc,
SX-1250 connection. The output center point is at OV from the balanced plus and minus power supply, while 100% DC NFB is applied to Q2 through R3. Because of this, circuit DC gain becomes OdB and DC voltage of the output center point is determined by Q1 base voltage. VR1 is a semi-fixed resistor for fine adjustment of the center point voltage to compensate for irregularities in circuit elements.
flows through the relay coil, operating the relay to turn on the power amplifier output circuit. The reverse bias of Q6 base from D6 & R19-R21 disappears when the power supply is set from ON to OFF. Q6 remains ON however, due to the residual power supply voltage. C4 very rapidly discharges, Q7 base potential drops and Q7 turns OFF. The relay releases and the power amplifier output circuit turns OFF.
SPEAKERS Switches The SX-1250 is provided with 3 sets of speaker terminals (A, B, C). Since the power amplifier can become overloaded if all three sets are used simultaneously, when all 3 SPEAKERS switches are set to ON, the circuit functions as if all switches were OFF and the indicator lamps extinguish.
Note: QS is normally ·OFF due to base bias and does not participate in the muting operation.
4.3 PROTECTION CIRCUIT This circuit protects the power transistors in case of overload, the speakers in case of power amplifier malfunction, and also performs a muting function when the power supply is turned ON or OFF. The protection circuit is composed of three sections (Fig. 18). Power amplilier + Vee
Operation by Detector Circuit Command Command from the detector circuits through one of D3, D4 or D5 and are applied in the form of a current flow. Q5 is normally reverse biased through R14, but when a large current flows through on of these diodes, Q5 base potential declines according to the voltage drop at R14. Q5 then becomes ON, Q6 base potential rises and Q6 becomes ON. C4 rapidly discharges and Q7 base potential drops, turning Q7 OFF. The relay releases and the power amplifier output circuit becomes cut off. -t Vee o--- ----.--1"'"---.,..---, I Relay
01erload detector
~ ceil
Detectors
Center poi1l pote1lial •elector Vee
R••
R••
Relay drin
Fig. 18.
Rf.-Gh
Block diagram of protection circuit
1. Relay Driver Circuit (Fig. 19) The relay which connects the output circuits is driven by this circuit. It also performs a muting function to prevent unpleasant noise during ONOFF operation of the power supply as well as opening the output circuit on command from the detector circuits. Muting Operation When the power supply is turned ON, Q6 base is reverse biased through D6 and R19-R21, turning Q6 OFF. Q7 base potential rises as C4 charges through R22 & R23, and Q7 turns ON several seconds later. The collector current of Q7 then
06
o-~Mr-.._."Nv~__,-'V\/Ir-,.._--o
AC 1. 5V
Fig. 19. Schematic diagram of relay driver circuit
2. Overload Detector Circuit Shorting of the power amplifier load or a load impedance below the specified value causes a command to be sent to the relay drive circuit. This is illustrated in Fig. 20. With the output stage in class B operation, when Qa is operating in the positive half cycle, Qb becomes cut off and the signal current flows as indicated by the solid arrows in Fig. 20. Point D potential at this time is the point A potential divided by R1 and R3. Also, point C potential is the point A potential divided by RE1 and RL (load). Point D is connected to Q1 base and point C to Q1 emitter through R2 and RE2. When RL is extremely small, the point C potential becomes considerably lower than point D. This potential difference forward biases Ql. Q1 turns ON and current flows in D3.
17
Qb operates in the negative half cycle and Qa becomes cut off. The signal flows is indicated by the broken line arrows in the center of Fig. 20. Ql is biased by the potential difference between point C and point E. If RL is extremely small, the point C potential becomes considerably higher than that of point E. Ql turns ON and current flows in D3. If large current flows in Qa and Qb, Ql becomes ON due to the REI and RE2 voltage drops, and current flows in D3. Cl prevents faulty operation due to external noise.
+ Vee
+ Vee
l '
I
Power
'
I
a~a,lilier
I '
I' I
Vee
- Vee
Fig. 21 . Basic circuitry for center point potential detector
- Vee Fig. 20. Basic circuitry for overload detector
3. Center Point Potential Detector Circuit If a DC potential is produced at the junction point of the power amplifier, a command is sent to the relay drive circuit. Fig. 21 shows this operating principle. Q3 and Q4 compose a differential amplifier. When the same input is applied to both input terminals (Q3 and Q4 bases), no output is present. However, if there is a difference between the terminal inputs, the difference is amplified and becomes the output between the two collectors. During normal operation, an AC signal only is present at the junction point. As C2 reactance is sufficiently low, the same signal is applied to Q3 and Q4 bases, resulting in an absence of output at the collector sides. When a DC potential is produced at the junction point, it becomes the input of Q3 only. If the voltage is negative, Q3 collector current declines And at Q4 the collector current increases and the potential drops, causing current to flow through D4. If the DC voltage is positive, Q3 collector current increases and the potential drops, while at Q4 the collector current decreases and the potential rises. Current therefore flows through D5.
18
4.4 POWER SUPPLY CIRCUIT All power supplied are regulated up to the power amplifier predriver stage. Independent power transformer secondary windings are employed for left and right channels in the power stage. Each channel is also supplied from an independent bridge rectifier and two 22,000J.L F capacitors. Position lamps are lighted by DC from a regulated power supply for stable illumination. Inrush Current Suppressor Circuit Ordinarily, power transformer inrush current when the power supply is turned on is opposed by DC resistance of the winding and instantaneous inductance of the air core. In the toroidal power transformer used in the SX-1250, both these factors are very low. Combined with the high charging current of the four 22,000J..LF capacitors in the secondary, inrush current can reach several hundred amperes. A resistors is therefore provided in series with the primary coil to suppress this inrush current to several tens of amperes. This resistor becomes shorted after power transformer excitation. The inrush suppressor circuit is shown in Fig. 22. Sl is the POWER switch and S2 a relay . The Microtemp is a temperature responding fuse. S2 is open before power is turned on, connecting the power transformer primary coil in series with Rl and the Microtemp. After power has been turned on, the relay operates when DC current is obtained from the rectifier, closing S2. If S2 fails to close, due to power supply or relay malfunction, Rl heating opens the Microtemp (109° C operating temperature), thus opening the primary circuit.
sx-., eso ! ' Relay S,
Fig. 22.
Rectifier
Fuse
Basic circuitry for inrush current suppressor
5. LEVEL DIAGRAM AUX (TAPE) PHONO u-- -- - - 1 .
8Q [ dBV]
I I I
SPEAKER 39V
'
I
30
20
I
10
I
co
'"0 N C'>")
POWER IN l V /
0 - 10
,
I
- 20 - 30
- 40 - MIC 6. 5mV
I
- 50
I
I
AUX 150mV
/
/~
<.D
T
co
"0
en en
FR EQU ENCY: 1kHz
C'>")
PHONO 2. 5mV
- 60 -8. 3dB
19
SX-1250
6. BLOCK DIAGRAM SWrTCHES : S• • FM 75.0. Uf.:BA L.
POWEK
(SPEAKERS) S2s-: SPEAKE~S A $27 : SPEAKERS B S 28; SPEAKERS C
( FUNCTION) S11 : AM S12 :
FM
S•3:
PHONO 1 PHONO 2/MIC AUX
S14 ·
GND
Sts:
Sz~:
FM MUTING
s30 :
FM MULTI PATH
S31 :
FM DE-EMPHASIS
AM I I r-- - J I
A:
:srt:•lEO
I mJ ".._r.t ~· &-
,., ---~ 1
------
AUX
----
___ j
St6: Sn: Sta: S19:
TAPE MONITOR 1 TAPE l'I.ONITOR 2 APE DUPLICATE ADAPTOR
Sz1 :
MODE MUTING
Sn:
LOUDNESS
Sz3:
TONE
5(4: Sts ·
LOW FlLTER HIGH FILTER
520:
PHONO 1 PHONO 2
!
MIC
PRE OUT
MIC
!
PRE OUT
r-·---
AU X
J'oNe Ctrcwt JProtecttJn ~. . . . +-t...._...} ;tamp
AC POWER 120V
--1---tt+-]
AC outlets
SPEAKER A SPEAKER B
Con·.tol
SPEAKER C
secC,on
PHONES
,.-'V\.fV-.-~
SPEAKER A Power amJ.
SPEAKER 8 SPEAKER C
•L._ ___
20
.L__ ___________________
Sza
21
7. DISASSEMBLY Top Plate
Remove the six screws (A) to detach the top plate. Wooden Cover
Remove the two screws (B) on each side of the wooden cover. A
A \?
~B
Fig. 25
Bottom Plate
Remove the fifteen screws to detach the bottom plate.
Fig. 26
22
SX-1250
Front
nu~n["
Loosen s the kthe TU NING and VOL all R emove nobsetscrews by pulrof mm the three Remove the sub-tone the two a nUME knobs from with the alt op h exagona! cont edge of wrench the f ront . R emove volume ro shafts. .
:;'"'ws
. .,
l Tone Am p IT R I ler Assembl
emove the th ree screwsy (C). Flat Am p IT R I ler Assembl
emove the th ree screws y (D). Fig. 28
Front
Fig. 27
Loosen the setscrews E
f$f
~"' EE
E~ F
Speakers Switch A
Remove the fo
~·
ssembly .--
ur screws (E).
Filter Am PIT R I ler Assembl
emove the t wo screws (F). y Function Switch
Remove the t
Assembly
wo screws (G).
---~ll"f:(~ ~
Fig. 29
24
8. PARTS LOCATION 8.1
FRONT VIEW
Knob (FILTER 8kHz) AAD-114
Knob (FM MULTI PATH) AAD-114
Knob (AM) AAD-1 14
Knob (FILTER 30Hz) AAD-114
Knob (FM MUTING) AAD-114
Knob (FM) AAD-114
Knob (SPEAKERS C) AAD-114
Front assembly ANB-386
Knob (PHONO 1) AAD-114
Knob (SPEAKERS B) AAD-114
Knob (PHONO 2/ MIC) AAD-114
Knob (SPEAKERS A) AAD -114
Knob (AUX) AAD -114
Knob (Tuning) AAA-034
________
•
.............., ...................__,..,._: -r -.'. -.__._.• ._.._...._._.....
c5 ...
.
._.._...___..;_._.~Me-.~.-.-.-~•
o (). ?5
6
~
......
Knob (MUTING ) AAD -113
~~.
r~
r'· -· t'-
••
·· (~
lR£U1..£ ioi'l,h .. ,
. ........... f.
.r
(
II
-~~-
/
• • • •
~I
"" II -II
·I
I
I
)
Knob (VOLUME) AAB-104
..
Knob (LOUDNESS) AAD-113
Knob (POWER) AAD-113
Knob (MODE) AAD-11 3
Knob (BASS 50H z) AAB -100
25
Knob (BALANCE) AAB-100
Knob (BASS 100H z) AAB-100
Knob (TREBLE 10kHz) AAB- 100
Knob (TAPE MONITOR 1) AAD-113
Knob (TONE) AAD-113
Knob (TREBLE 20kHz) AAB-100
Knob (TAPE DUPLICATE) AAD-113
l
Knob (ADAPTOR) AAD-113
Knob (TAPE MON ITOR 2) AAD-113
SX-1250
8.2 REAR VIEW
Terminal (TAPE 2) AKB -030
Connector socket 5P ( R EC/ PLA Y) AKP-007
Terminal (TAPE 1) AKB -030
Term inal (ADAPTOR) AKB-030
Terminal (INPUT) AKB -033
Terminal (SPEAKERS) AKE-014
Terminal (GND) • AKE-012 Bar-antenna holder W72-092
Ferrite bar-antenna ATB-051
Terminal (ANTENNA) AKA-004
Slide switch (DE-EMPHASIS) ASH -015
Terminal (PRE/ POWER AMP) AKB -030
AC power cord ADG-013
AC socket (AC OUTLETS) AKP-005
Terminal (FM DET OUT) AKB-0 19
28
8.3 TOP VIEW
Power transformer ATT-267
Electrolytic capacitor (22 OOOpF 80V) ACH -056 '
Electrolytic capacitor (22 OOOpF 80V) ACH-056 '
Relay (S2) ASR -015
Power amplifier assembly AWH -048
Power amp lifi er assemb ly AWH -048
Stabili zer assembly AWR -106 Protection circuit assemb ly AWM-091
Tuner assembly AWE -068
Tuning drum assembly AXA-070
Equalizer amplifier assembly AWF -021
FM front end AWB-023
•
-------·
Lamp assembly (PL 1- PL4 8V 0 3A) AEL -056 ' · Tuning shaft assembly AXA -111
Lamp board assembly AWX-096
I
29
•
I
SX-1250
8.4 BOTTOM VIEW
Ferrite balun T22-025
Fuse lA (FU l ) AEK-106
Fuse 12A (FU6, primary) AEK -301
Fuse 1A (FU2) AEK-106
Fuse 1A (FU3) AEK-106 Power supply assembly AWR -107 Fuse 1A (FU4) AEK-106
Fuse 1.5A (FU5) AEK-104
Filter ampl ifier assembly AWM -089
Speakers switch assembly AWS-095
Function switch assembly AWS-094
Flat amplifier assembly AWG-042
Ceramic capacitor (0.01,uF 150V) ACG -003
1
Control amplifier assembly AWG -041
32
8.5 FRONT VIEW Double meter (SIGNAL/TUN IN G) AAW-040
Push switch (FILTER, FM MUTING, MULTI PATH) ASG -098
Indicator (STEREO) AAT-028
Indicator AAT-027
Indicator (SP-A, SP-B, SP-C) AAT-026
Dial scale plate AAG-106
Tuning shaft assembly AXA-111
Push switch (SPEAKERS) ASG-094
Push switch (AM, FM, PHONOI, PHON02/ MIC) ASG·095
Phone jack (PHONES) AKN-010
Lever switch (POWER) ASK-080
..
•
Phone jack (M IC) AKN-013
o.
Lever switch (MUTING) ASK-090
------------~----~~
Variable resistor ( 102k, 5-step, BASS 50H z) ACV-165
Lever switch (LOUDNESS) ASK -090
Variable resistor ( 102.6k, 11 -step, BASS 1OOHz) ACV-166
Lever switch (TONE) ASK-090
Variab le resistor (99k, 11·step, TREBLE 1OkHz) ACV-167
Variable resistor ( 102k, 5·step, TREBLE 20kH z) ACV-168
33
Variable resistor (50k, 32-step, VOLUME) ACV· 169
Lever switch (TAPE MONITOR 2) ASK·092
Lever switch (TAPE MONITOR 1) ASK-092
Lever switch (DUPLICATE) ASK·084
Lever switch (MODE) ASK-090
Variable resistor (100k-HB, BALANCE) ACV·163
Lever switch (ADAPTOR) ASK -092
SX-1250
9. ADJUSTMENTS 9.1 AM TUNER 1. Set function switch to AM . 2. Connect AM signal generator through 1k-ohm resistor to AM antenna terminal. 3. Set DUPLICATE switch to OFF and connect an AC voltmeter to TAPE 1 REC jacks. 4. Set AM SG for 400Hz 30% modulation 100dB output. 5. Set SX-1250 dial indication and AM SG frequency for 600kHz. 6 . Adjust T3 core for maximum reading on AC voltmeter. 7. Set SX-1250 dial indication and AM SG frequency for 1 ,400kHz.
8. Adjust TC1 for maximum reading on AC voltmeter. 9. Set AM SG for 30dB output. 10. Set SX-1250 dial indication and AM SG frequency for 600kHz . 11. Adjust T3, T4 and bar antenna core for maximum reading on AC voltmeter. 12. Set SX-1250 dial indication. and AM SG frequency for 1 ,400kHz. 13. Adjust TC1, TC2 and TC3 for maximum reading on AC voltmeter. 14. Repeat steps 10~ 13 to eliminate variations in AC voltmeter readings.
AC Voltmeter
.. ,. 4
~
.
-• •
AM Signal Generator
~
•
oo@ @ 0
00
0 0 0 0
Fig. 30
35
Tuner Assembly
9.2 FM TUNER FM Front End
1. Set function switch to FM. 2. Set FM MUTING switch to OFF. 3. Connect FM signal generator through 300-ohm dummy load to 300 ohm FM antenna terminals. 4. Set DUPLICATE switch to OFF and connect AC voltmeter to TAPE 1 REC jacks. 5. Set FM SG for 100dB output at 400Hz and 100% modulation. 6. Set SX-1250 dial indication and FM SG frequency for 87.4MHz. 7. Adjust T5 core for maximum indication on SIGNAL meter. 8. Set FM SG for 8dB output and adjust cores of T1, T2, T3 and T4 for maximum reading on AC voltmeter. 9. Set FM SG for 100dB output. 10. Set SX-1250 dial indication and FM SG frequency for 106MHz. 11. Adjust TC5 for maximum indication on SIGNAL meter. 12. Set FM SG for 8dB output and adjust TC1, TC2, TC3 and TC4 for maximum reading on AC voltmeter. 13. Repeat steps 5 ~ 12 to eliminate variations in AC voltmeter readings. 14. After completing above adjustments, adjust T6 core for maximum reading on AC voltmeter. Bottom View of FM Front End
c@-T2
TC2
Multiplex Decoder
24. Connect MPX SG (multiplex signal generator) to the external modulator terminals of the FM SG and set the FM SG for external modulation. 25. Connect PILOT OUT terminal of MPX SG to horizontal input terminal of oscilloscope. 26. Using a probe, connect oscilloscope vertical input terminal to terminal No. 9. 27. Set FM SG for 98MHz 60dB output unmodulated. 28. Tune SX-1250 for exact center of scale indication on TUNING meter. 29. Adjust VR2 so that 4 : 1 frequency ratio Lissajous' (see note below) figure becomes stationary. 30. Set FM SG for 1kHz (L or R), ±67.5kHz deviation, 19kHz (pilot signal) and ±7.5kHz modulation. 31. Adjust VR3 for minimum L-R crosstalk. Note: Signal at terminal No. 9 is 76kHz sawtooth waue and MPX SG pilot out is a 19kHz sine waue. These form a Lissajous ' figure such as shown in Fig. 32.
&0&0 TC3
15. Connect DC voltmeter to terminal No.43. 16. Tum VR1 and VR3 fully counter-clockwise. 17. Detune SX-1250 to where only noise is received and adjust T1 core for center of scale indication on TUNING meter. 18. Set FM SG for 98MHz 60dB output. 19. Tune SX-1250 for exact center of scale indication on TUNING meter. 20. Adjust T2 upper core for OV (±lOmV) between terminal No. 43 and ground. 21. Adjust T2 lower core for minimum distortion. 22. Repeat steps 20- 21 several times. 23. Set FM SG for 100dB output and adjust VR1 so that SIGNAL meter indicates 4.7 on the scale.
-- -=
m
Cj
TC4
0
~~
c@f'T4
~.
0 r~
T5
0
((@)-T6
li
~
I
~~ ~
I ..a
~n ~
I II Fig. 3 1
36
a 14 =-1-
a f4
TC1
I
.,
I
~
I!!!!!I I
c
Fig. 32
SX-1250
AC Voltmeter Distortion meter
~
0@) 00 MPX Signal Generator
0
0
FM Signal Generator
~@ 0
00 dummy antenna
@ 00
Q
0 0
0 0 0 <0
0
®
Probe VERT.
i HORIZ.
p
DC Voltmeter
• FM Front End Fig. 33
37
9.3 POWER AMPLIFIER
9.4 STABILIZER
1. Tum VR2 fully counter-clockwise before turn-
1. Adjust VRl for 65V between terminals No.l7 (+)and No.12 (ground). 2. Adjust VR2 for 65V between terminals No.l2 (ground) and No.l6 (- ).
~-
3. 4. 5. 6. 7. 8.
ing on the power. Remove jumper plugs connecting POWER IN and PRE OUT jacks. Connect 5.1 k-ohm resistor to POWER IN jacks. Set power amplifier for no load. Set POWER switch to ON. Adjust VRl for OV between terminal No.9 and ground. Adjust VR2 for lOOm V between terminals No.7(+) and No.l9 (- ). Allow set to warm up for at least 10 minutes, then readjust.
Stabilizer Assembl Fig. 34
'
Fig. 35
38
SX-1250
10. DIAL CORD STRINGING 1. Remove the wooden cover and the front .
2. Remove the three screws to detach the blind sash (Fig. 36). 3. Turn tuning drum fully clockwise (as viewed from X direction in Fig. 37). 4. Tie one end of cord to stud on inner section of tuning drum (more easily performed by loosening setscrew and temporarily removing tuning drum from shaft). 5. Route cord through tuning drum cutout, make a half turn around the drum, then route in sequ'ence to pulley A. 6. Wind cord 3 turns clockwise (as viewed from rear ) around tuning shaft, then route to pulley B- pulley C-pulley D. 7. Wind cord two turns around tuning drum and tie to spring hook so that tension is applied to the cord. 8. Turn TUNING knob and confirm normal cord motion, then trim off excess cord. 9. Turn the tuning knob fully counterclockwise and fix the dial pointer to cord so that it indicates 87 .4MHz on the dial scale.
Dial Pointer Installation Caution Metal portion of dial pointer is plated. If this section is touched directly by hand or fingerprints and other impurities, it is difficult to remove dirt from aventurine finish. As this is not desirable in of both appearance and anticorrosion, take extreme care not to touch the metal section when handling the dial pointer,
Fig. 36
Starting point (87.4MHz)
Tuning drum
Spring hook
c Tuning shaft
~
Fig. 37
39
11. EXPLODED VIEWS NOMENCLATURE OF SCREWS, WASHERS AND NUTS
The following symbols stand for screws, washers and nuts as shown in exploded view. Symbol
Description
Symbol
Description
Shape
Brazier head tapping screw
AT
Shape
(JeD
E type washer
EW
Cb
~
@
~
PT
Pan head tapping screw
(jc:D
FW
Flat washer
BT
Binding head tapping screw
(leo
sw
Spring lock washer
CT
Countersunk head tapping screw
[)en
N
Nut
TT
Truss head tapping screw
(]en
WN
Washer faced nut
OCT
Oval countersunk head tapping screw
tn=o
ITW
Internal toothed lock washer
(g
i
PM
Pan head machine screw
(jc::J
OTW
Outernal toothed lock washer
@
J
CM
Countersunk head machine screw
[)c=:l
sc
Slotted set screw (Cone point)
a
D
OCM
Oval countersunk head machine screw
[)1:J
SF
Slotted set screw (FIat point)
€}
D
TM
Truss head machine screw
(jc:l
HS
Hexagon socket headless set screw
@
ID>
BM
Binding head machine screw
{)c::l
ocw
Oval countersunk head wood screw
PSA
Pan head screw with spring lock washer
ao
cw
Countersunk head wood screw
PSB
Pan head screw w ith spring lock washer and flat washer
(1:=1
RW
Round head wood screw
PSF
Pan head screw with flat washer
oP
EXAMPLE PM 3x8
L _ length in mm ( I ) diameter in mm ( d ) Symbol
40
ln:::=cl
l/ J
t
T1
FW 9
1
l__ thickness in mm ( t )
~ diameter in mm (d)
Symbol
-
© I © ~ @ ~
~
....
~ --~
G
SX-1250 1
2
4
3
5
Exterior
6 NOTE: Parts indicated in g·reen type cannot be supplied.
Screw M4x8 ABA-123
A
Screw 3x8 ABA-002
A
Screw 3x8 ABA-081 Screw 3x8 ABA-002
Top plate ANE-105
See Page 48.
Screw 4x15 ABA-113
Screw 3x8 ABA-081
See Pages 43-47. B
B Wooden cover AMM-049
Coil spring ABH-022 AT 3x8 Spacer 'il AEC-258
Screw 4x15 ABA-113 Mask AED-018
Screw 4x8 ABA -012
Front assembly ANB-386
c
c Washer faced nut ABN -024
Screw 4x8 ABA-012
Knob (BASS 50Hz, 100Hz) Knob (TREBLE 10kHz, 20kHz) Knob (BALANCE) AAB -100
Foot AEC-178 Screw 4x8 ABA-012
Knob (MUTING, LOUDNESS, MODE) Knob (POWER, TONE, ADAPTOR) Knob (TAPE DUPLICATE, MONITOR) AAD-113
D Knob (Tuning) AAA-034
D Screw 4x8 ABA-012
Knob (VOLUME) AAB-104
AT 4x16
Foot AEC-178 AT 4x16
1
2
3
4
5
6 42
3
2
1 'de Component (FRONT)
Tilp Sl
Pulley shaft
RT 3x6
RT 3x8
Rubber spacer AEB-087
--===~5[===;~~~---=:::::b:suuppl ied. 6
-
ABA-114 Pulley AEC-101 RT 3x6
A
4
NOTE: Parts indicated .m g'""" typoo•nnot e'
RT 3x6
RT 3x6 Lamp ass, mbly (PL 1- PL4, 8V 0.3A) AEL-056
A
I RT 3x8 RT 3x6
Lamp ! board assembly AWX-096 Rubber bracket B AEB-086 Indicator (STEREO) AAT-028
RT 3x8 Acrylic boardAEC-272 RT 3x6 Pull y shaft AB.4,-114 Pulley AEC-101
RT 3x6
B
Tuner assembly AWE -068 Tum·ng drum assembly AXA-070
B RT 3x6
RT 3x6
Equal izer amplifier assembly AWF-021
RT 3x8 Double meter (SIGNAL/TUNING) AAW-040 Rubber bracket A
RT 3x6
AEB -085 'th leads (8V, 50mA) Lamp WI (PL " O) ( PL8) PH -1 AM AEL-q74 AE L-076 PH-2 (PL11) FM (PL9) AE L-q72 AEL-075 AUX jPLI2)
c
Tunm . g shaft assembly
AXA-111 Indicator (AM, FM ' PH -1,
\
PH-~. AUX) Pul(ey ~haft ABA-114
AAT-027 Washer 9
RT 3x6
c
AEL-073
Pul~y ,~small)
M45-086 Nut 9'~'
,~.
AE -2.J6
J~
871·004 Shaft cover AAT-025
\T
-~
Blind sash AAP-037
base ABN-022
Blf3x6
D
D
Pulley (small) AEC-256
1 43
Pulley shaft ABA-114
2
3
4
5
6
SX-1250 2
1
4
3
5
Top Side Component (REAR) Power amplifier assembly AWH-048 Screw 3x8 ABA-002
NOTE: Connection cable housing ADX-033 Connection cable housing ADX-032
RT 3x10
Parts indicated in green type cannot be supplied.
Protection circuit assembly Connection cable housing AWM-091 ADX-031 I Connection cable housing Stabilizer assembly ADX-036 Connection cable housing AWR-106 ADX-030 Connection cable housing ADX-034 Connection cable housing ADX-035 Connection cable housing ADX-039
A t 1
6
Connection cable housing ADX-037 Transistor 2SD555-R PM 3x16 RT 3x10 /
A
Connection cable housing ADX-033 Connection cable housing ADX-032
B
B
Power Amplifier assembly AWH-048
RT 3x10
Screw 3x8 ABA-002 Connection cable housing ADX-038
c
c
RT 3x6
Insulator wafer AEC-076
Connecting plate AKF-053 Spring lock washer ABE-018 Binding head screw M 4x5 ABA-129
D
1
2
RT 3x6 Connecting plate AKF-053 Spring lock washer ABE-018 Bindif,g head screw M 4x5 ABA1129
3
RT 3x10
4
Transistor 2SD555-R RT 3x10
RT 3x6
5
D
6 46
2
1 Bottom Side Components
3 NOTE: Parts indicated in green type cannot be supplied.
Fuse holder 1P AKR-028
Terminal strip 2P AKC -030
Relay ASR-015
A
A RT 3x8 Wire er AEC-151
RT 3x6
RT 3x6 Terminal strip 2P AKC -038
Terminal strip 2P AKC-030
B
;?
RT 3x8
B
RT 3x6 Lever switch (POWER) ASK-080
~ RT 3x6
~ l
T3x6
Power supply assembly AWR-107
C
c
Speakers switch assemb ly · AWS-095
Fuse 1A (FU1) AEK -106 Fuse 1A (FU2) AEK-106 Fuse 1A (FU3) AEK-106 Fuse 1A (FU4) AEK-106 Fuse 1.5A (FU5) AEK-104
D
Control amplifier assembly AWG-041
D
Microphone jack assembly AWX-097 Flat amplifier assembly AWG -042
1 47
2
3
1
2
3
Rear Component
NOTE: Parts indicated in green type cannot be supplied.
A
A Terminal (TAPE 2) AKB-030 Terminal (PRE/POWER AMP) AKB-030 T erminal (FM DET OUT) AKB-019 Terminal (TAPE 1) AKB -030
B
De-emphasis switch assembly AWX-099 Terminal (INPUT) AKB-033
~
,
T Nut7¢> 871-010
Internal toothed lock washer ABE-006
l
Terminal (ANTENNA) AKA-004
c
a RT 3x8
RT 3x8
~
9M 3x8
I
r T-3x10
RT 3x10 Strain relief AEC-079
Strain relief AEC-079 Screw 3x8 ABA-002 AC power cord ADG-013
c
RT 3x8
Terminal (GND) AKE-012 RT 3x8 RT 3x6 Bar-antenna holder W72 -092
D
D
1 48
2
3
SX-1250 1
2
Parts indicated in green type cannot be supplied. Lever switch (MONITOR 2) AKS -092 Lever switch (ADAPTOR)
Lever switch (DUPLICATE) ASK -084 Lever switch (MONITOR 1) ASK-092
~K~2
A P C bo rd
t-
3 NOTE:
Flat Amplifier Assembly (AWG-042)
Variable resistor (100k-HB, BALANCE) ACV-163 Variable resistor (50k, 32-step, VOLUME) ACV -169
d mrt I
Screw ABA-116
I
A
Lever switch (MUTING) ASK-090
Lever switch (LOUDNESS SK-090 Lever switch (MODE) ASK-090
B
Washer faced nut ABN-024
B Union nut ABN-021
PC. 'Jo ra
Control Amplifier Assembly (AWG-041) RT 3x6
Variable resistor (102.6k, 11 -step, BASS 100Hz) ACV -166 Variable resistor (102k, 5-step, BASS 50Hz) ACV -165
c
h £ Ia cov.•r
Lever switch (TONE) ASK -090 Variable resistor (99k, 11-step, TREBLE 10kH z) ACV-167 Variable resistor ( 102k, 5-step, TREBLE 20kHz) ACV -168
P C bo:1rd held '!leta
Washer faced nut ABN -024
D
Screw 3x6 ABA-116 Washer faced nut ABN -024
c
@( P (..
D
bO r
RT 3x6
1
2
3 4 9
2
1 Switch Assembly (AWS-094)
3 NOTE: Parts indicated in green type cannot be supplied.
Push switch (AM, FM, PHONO 1, PHONO 2/MIC, AUX) ASG-095
Switch Assembly (AWX-099)
A
A
Slide switch (DE -EMPHASIS) ASH-015
p (
PC bo
8
Switch Assembly (AWS-095)
rd
Microphone Jack Assembly (AWX-097)
Push switch (SPEAKERS A, B, C) ASG-094
8
Phone jack (PHONES) AKN-010
~
Phone jack (MIC) AKN -013
I
PC b
r
c
c Filter Amplifier Assembly (AWM-089) Push switch (FILTER, FM MUTING, MULTIPATH) ASG-098
5P Connector Assembly (AWX-062) 5P connector socket ( REC/ PLA Y) AKP-007
p
l,
D
1 50
2
b
3
r
D
12. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTS NOTE: 12.1
• Capacitors: in fJ.F unless otherwise noted p:pF • Resistors: inn, *W unless otherwise noted k:kn, M :Mn
MISCELLANEOUs-PARTS
FUSES
SEMICONDUCTORS Symbol
Description
Part No.
Symbol
01 02 03 04 05
Transistor Transistor Transistor Transistor Transistor
2SB600-R 2SB600-R 2S0555-R 2S0555-R 2SB600-R
FU1 FU2 FU3 FU4 FU5
06
Transistor Transistor Transistor
2SB600-R 2SD555-R 2SD555-R
FU6
Q7
08
Part No.
Description Fuse Fuse Fuse Fuse Fuse
I
AEK-106 AEK-106 AEK-106 AEK-106 AEK-104
1A 1A 1A 1A 1.5A
Fuse 12A (primary)
AEK-301
COILS AND TRANSFORMER Symbol
SWITCHES Symbol S1 S2
Description Lever switch (POWER) Relay
Part No. ASK-080 ASR-015
Description
Part No.
Ferrite balun Ferrite bar-antenna Power transformer
T1 T2 T3
T22-025 ATB-051 ATT-267
RESISTOR LAMPS
Symbol Description
Symbol
Description Carbon film
R1 PL1 PL2 PL3 PL4 PL5
PL6 PL7 PL8
assembly {8V, 0.3A) assembly {8V, 0.3A) assembly {8V, 0.3A) assembly (8V, 0.3A) with leads (8V, 50mA, SP-At
AEL-056 AEL-056 AEL-056 AEL-056 AEL-074
Lamp with leads {8V, 50mA, SP-B) Lamp with leads (8V, 50mA, SP-C) Lamp with leads (8V, 50mA, AM)
AEL-072
Lamp Lamp Lamp Lamp Lamp
PL10 PL11
PL1 2 PL13
2.2M
Y:.W
RDY:.PS 225J
CAPACITORS Symbol
Description
Part No.
C1 C2 C3 C4 C5
Electrolytic Electrolytic Electrolytic Electrolytic Ceramic
22,000 22,000 22,000 22,000 0 .01
80V 80V 80V 80V 50V
ACH-056 ACH-056 ACH-056 ACH-056 CKDYF 103Z 50
AEL-076
C6 C7
Lamp with leads (8V, 50mA, FM) Lamp with leads (8V, 50mA, PH-1) Lamp with leads (8V, 50mA, PH-2)
AEL-075
C9 C10
Ceramic Ceramic Ceramic Ceramic Ceramic
0.01 0.01 0.01 0.01 0.01
50V 50V 50V 50V 50V
CKOYF CKOYF CKOYF CKOYF CKOYF
Lamp with leads (8V, 50mA, AUX) Lamp with leads {8V, 50mA, STEREO)
AEL-073
C11 C12 C13 C14 C18 C19
Ceramic Ceramic O.Q1 Ceramic O.Q1 Electrolytic Mylar Mylar
50V 0.01 150V (DC1.4kV) 150V (OC1.4kV) 100 6V 200V 0.1 0. 1 200V
AEL-073
C8 PL9
Part No.
Part No.
AEL-074 AEL-072
AEL-069
I
103Z 50 103Z 50 103Z 50 103Z 50 103Z 50
CKOYF 103Z 50 ACG-003 ACG-003 CEA 101P 6 COMA 104K 200 COMA 104K 200
51
SX-1250 ExternaI Appearance of TranSIStor . sand ICs
HA1137 HA 1138 HA1196
HA 1201
910111213141516
~~h 5678
~,.
2SK30AW
2SA684A 2SC1384
2S8507P 2SB630 2 SD313P 2SD325R 2SD610
Inde_x
3SK39 3SK45
0
~G2 G1
2SA628 2SA720 2SA733 2SA750 2SA858 2 SA872A 2SC945A 2SC1318 2SC1439 2SC1775A
2SB600 2SD555 2SC1342
2SA899A 2sC1904
2SC1166
~ tY~
2SA725 2SA726 2SA850 2SC710 2SC869 2SC1312 2SC1313 2SC1735
m:c 52
2
1
3
4
6
12.2 SCHEMATIC DIAGRAM
PI\OTEC.T IOtl ASS'y
Aw" -051
Y,
A
A r ·-------~~~ ASS'y_ AWE ·.C!!.._ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
I
t
B
B
.,
C!l!:!J '~<
"' ~
m!!J PC'K 1
[!EJ
''"
c
l ..
c
[!!!)
..' l
"'"
"'
SMTCHfS;
S,
POWEf'
St
~fi..A'1
1
''"
J
9ES•STO'< • I'll OnM,I/-4'1" tS4fc TOlff\4.-..(:f \J'tlf.SS ~TI"'E.Aw SE. NOTED K : ~.a. 11 ~Q.
D
SIGNAl., \'Ol.T.AGE AT SPEMER O.JTP\.-T CA.F~C11'CflS;
I"UTII't:i
IN.-,.F !J'olfSS o·HfRIIIISf. NOTED P pF
LOIJDNE.~
D
W/8Q. lltH1
OC ~~MEf'IT 41 t..0 "'P\IT SISIII.Al V0~1'AGE AT NO JHP<JT S!:lNAl
0C
TO!<E \.OW FtLT[f\ HII;H FILTEf\ ~EAr.fO.. A.
SPE.IIKE.f\ 8 sPEAHff', C
1 53
2
3
4
5
6
12.3 INTERNAL CIRCUITRY OF INTEGRATED CIRCUITS
HA1138 (AM IC)
r ·----
~ ~ I~ I
!
HA1196
f _r___ _ i I I
i
7
•
'>
6
12
tO
II
55
SX-1250 TA 7061AP
HA 1201
.-------------,
~
4
12.4 THE CIRCUIT OF FM FRONT END (AWB-023)
I
I I
I I
56
2
1
4
3
5
6
12.5 TUNER ASSEMBLY (AWE-068)
A
A
34
33
Q1 IN
HA 1201
~2
HA 1201
Q4 TA7061AP
44-
12
30
B
35
~------+-------------_J
l2
c,
~--~
Css
R22 2.ZK
Q.:J1
Css 1'
10
B
0.01
+B
f1
2. 2p f-l 13 ±1V 32
11
O.l/35
13~1V
14 Qr;
RJl 2..2K L-------~~~-~--~~~~~~---+~~--~~--------------~~-o 13
MUT NG AUTO
out
2SC13H Multipatf'l
c
c .., Qe, Qs .OJO 0?
2SC.945A
osc vc
x3
T3
6.SV
Os
21 o------- - h --t-------. 1I II
~n~ ~ -~
E
26 E D
2'7
22
AN7 A"' ~CCAL V':... 8
23 E
2t.
RF
vc
25 t:
2.8
'7 ST PILOT
A'1
ANT 11 E
1 57
2
3
2
3
4
5
6
D
10
39 12 +B FM 25V CET out
vco t
4
5
6
SX-1250 2
1
4
3
5
6
AWM 089, No.5+---- - - - - - - - - - - . AWS-094, No.22~-----------,
A
A
AWM-089, No.4 + - - - - - - - - - - - - . AWG-042, No.1 AWR-106, No.10 ~--------_. AWM-089, No.1 ~------- AWS-094, No.35 ~-------. AWM-089, No.7~--....., AWS-094, No.31 "FM TIHI.IJNr. AWS-094, No.30 ...... ··~0Mt AWS-094, No.34+----~
c 33
1
t.H
034
c 35
c 36 c 37
c 38
c 39
c40 c 41
Fe
0 42
AWB-023, No. F + - - - ----1---.0r. 32
8
0 31
- 30 AWB-023, No.G - - - -++--.r.o 29
j~~ G
8
F!
AWB-023, N'o.H ~----4-f--.0./')44 AMANT BLU BLK ~ (VVJ
~~-~~-~.r.28
IYEW REO
~~--+--4-f--~v27
AWB-023,
No.C~ £~,-~-'--v"'26
~----------++-~-oo25
AWB-023, No.D ~----+--1--o- 24
-
.-++---of""l 23
c
~
c
AWS-094, No.38 ~---+-+---o~""~22 AWB-023, No.E
....., 21
c 20
FM DET OUT @-AWS-094, No.39-
AWS-094, No.33
;;;,
--....J
AWS-094, No.41-r-AWS-094, No. 3 2 + - - - - - -_.
AWS-094, No.B7 ~--'
AWR -1 06, No.9 + - - - - - - . . . J
D
D
AWX-099, No.2 _ _ _ _ __J AWX-099, No.3 +------....J AWX-099, No.1
t---------...J
AWX-099, N o . 4 + - - - - - - - - - - - l
1
2
3
4
5
6 60
Parts List of Tuner Assembly (AWE-068) SEMICONDUCTOR Symbol
Description
Part No.
Symbol
Description
Part No.
HA1201 HA1201 HA1137 TA7061AP HA1138
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
330 470 470 56 56
RDY..P5 331J RDY..P5 471J RDY..P5 471J RDY..P5 560J RDY..P5 560J
09 010
IC Transistor Transistor Transistor Transistor
HA1196 25C1312·G 25C945A·O 25C945A·O 25C945A·O
R11 R12 R13 R14 R15
Carbon Carbon Carbon Carbon Carbon
film film film film film
560k 470 680 47k 10k
RDY..P5 564J RDY..P5 471J RDY..P5 681J RDY..PS 473J RDY..P5 103J
011
Transistor
25C945A·O
Dl D2 D3 D4 05
Diode Diode Diode Diode Diode
152076 152076 152076 152076 152473
R16 R17 R18 R19 R20
Carbon Carbon Carbon Carbon Carbon
film film film film film
4 .7 k 47k 1k 15k 470
RDY..P5 RDY..P5 RDY..P5 ROY..P5 RDY..P5
472J 473J 102J 153J 4 71J
D6 D7
Diode Diode
152473 152473
R21 R22 R23 R24 R25
Carbon Carbon Carbon Carbon Carbon
film film film film film
470 5.6k 5.6k 220k 220k
RDY..P5 RDY..P5 RDY..P5 RDY..P5 RDY..P5
471J 562J 562J 224JNL 224JNL
R26 R27 R28 R29 R30
Carbon film Carbon film Carbon film Carbon film Carbon film
2.2k 470 2.2k 4.7k 2.2k
RDY..P5 RDY..P5 RDY..P5 RDY..P5 RDY..P5
222J 471J 222J 472J 222J
R31 R32 R33 R34 R35
Carbon film Carbon film Carbon film Carbon film Carbon film
2.2k 8.2k 8.2k 47k 30k
RDY..P5 RDY..P5 RDY..P5 RDY..P5 RDY..P5
222J 822J 822J 473J 303J
R36 R37 R38 R39 R40
Carbon film Carbon f ilm Carbon film Carbon film Carbon film
47k 30k 47k lOOk 1.8k
ROY..P5 473J RDY..P5 303J RDY..P5 473J RDY..P5 104J RDY..P5 182J
R41 R42 R43 R44 R45
Carbon Carbon Carbon Carbon Carbon
film film film film film
1.8k 1.8k 1.8k 3 .3k 3.3k
RD Y..P5 ROY..P5 RDY..P5 RDY..P5 RDY..P5
182J 182J 182J 332J 332J
R46 R47 R48 R49 R50
Carbon Carbon Carbon Carbon Carbon
film film film film film
15k 5.6 k lk 100k 560k
RDY..P5 RDY..P5 RDY..P5 RDY..P5 RDY..P5
153J 562J 102J 104J 564J
R51 A 52 A 53
Carbon film Carbon film Carbon film
100k 180 47k
RDY..P5 104J RDY..P5 181J RDY..P5 473J
01 02 03 04 05
IC IC IC IC IC
06 Q7
as
, •
TRANSFORMERS AND COILS Symbol
Description
Part No.
T1 T2 T3 T4
FM IF transformer FM DET transformer AM oscillator coi l AF RF coil
ATE-029 ATE-013 ATB-019 ATB-020
Fl F2 F3 F4 F5
FM ceramic filter FM ceramic filter FM ceramic filter FM ceramic filter AM ceramic filter
ATF-018 ATF-018 ATF-018 ATF-018 ATF·027
F6 F7 FB
Anti·birby filter Anti·birby filter FM low filter
ATF-023 ATF·024 ATF-028
L1 L2 L3 L4 L5
RF choke RF choke RF choke RF choke RF choke
T24-028 T24-028 T24-028 T24-028 ATH -007
coil coil coil coil coil
2.2J.t H 2.2J.tH 2.2J.tH 2.2J.tH 18J.tH
I
RESISTORS Symbol Rl R2 R3 R4 R5
61
Description Carbon Carbon Carbon Carbon Carbon
film film film film film
100 lOOk lOOk 470 150
Part No. RDY..P5 101J RDY..P5 104J RDY..P5 104J RDY..P5 4 7 1J RDY..P5 151J
Symbol
i
Description
Part No.
Symbol
R54 R55
Carbon film Carbon film
330 2 2k
RD%PS 331J RD%PS 223J
R56 R57 R58 R59 R60
Carbon Carbon Carbon Carbon Carbon
film f ilm f ilm film film
22k 22k 33k 5. 1k 3 .3k
RD%PS RD%PS RD%PS RD%PS RD%PS
223J 223J 333J 512J 332J
R61 R62 R63 R64 R65
Carbon Carbon Carbon Carbon Carbon
film film film film film
39k 2.2k 100 47 150
RD%PS RD%PS RD%PS RD%PS RD%PS
393J 222J 101J 470J 151J
R66 R67 R68
Carbon film Carbon film Carbon film
680 1k 47k
RD%PS 681J RD%PS 102J RD%PS473J
VR1 VR2 VR3
Semi-fixed Semi-fi x ed Semi-fi x ed
47k· B 4 .7k· B 150k-B
C92-048 A-018 A-014
I
.
CAPACITORS Description
Symbol
Part No.
-
TC1 TC2 TC3
Film t rimmer Film trimmer Film trimmer
ACM-002 ACM-002 ACM-002
C1 C2 C3 C4 C5
Ceramic Ceramic Ceramic Electrolytic Ceramic
0.01 0 .047 0 .047 2 20 0 .047
50V 25V 25V 16V 25V
C6 C7 C8 C9 C10
Ceramic Ceramic Ceramic Ceramic Elec tro lyt ic
0.047 15p 0.047 0.047 0.47
25V 50V 25V 25V 50V
CKDBC 4732 25 CCDSL 150K 50 CKDBC 4732 25 CKDBC 4732 25 CEA R47P 50
C11 C12 C13 C14 C15
Ceramic Ceramic Ceramic Ceramic Ceramic
0.01 0.047 0.047 0.047 0.01
50V 25V 25V 25V 50V
CKDYF 1032 50 CKDBC 4732 25 CKDBC 4732 25 CKDBC 4732 25 CKDYF 1032 50
C16 C17 C18 C19 C20
Ceramic Ceramic Ceramic Ceramic Ceramic
0.01 0.01 0.01 0.047 390p
50V 50V 50V 25V 50V
CKDYF 1032 50 CKDYF 1032 50 CKDYF 1032 50 CKDBC 4732 25 CCKSL 391 K 50
C21 C22 C23 C24 C25
Ceramic Ceramic Elec trolytic Electrolytic Electrolytic
390p 150p 10 47 470
50V 50V 16V 16V 16V
CCDSL 391 K 50 CCDSL 151 K 50 CS2A 100M 16 CEANL 470P 16 CEA 471 P 16
I
CKDYF 1032 50 CKDBC 4732 25 CKDBC 4732 25 CEA 221P 16 CKDBC 4732 2 5
Description
Part No.
-C26 C27 C28 C29 C30
Electrolytic Mylar Elect rolytic Electrolytic Polystyrene film
C31 C32 C33 C34 C35
4 .7 0.047 10 10 51 0p
-
25V 50V 16V 16V 50V
CEANL 4R7P 25 COMA 473J 50 CEANL lOOP 16 CEANL lOOP 16 COSA 511J 50
Polystyrene film 51 Op Electrolytic 100 Electrolytic 1 Ceramic 0.0033 Electrolytic 0.1
50V 16V 50V 50V 35V
COSA 511J 50 CEA101P16 CEA 010P 50 CKDY A 332J 50 CS2A OR1M 35
C36 C37 C38 C39 C40
Electrolytic Mylar 0.0033 Electrolytic Mylar 0.0033 Po lystyrene film 51 Op
25V 50V 25V
CEANL 01 OP 25 COMA 332J 50 CEANL 01 OP 25 COMA 332J 50 COSH 511J 50
C41 C42 C43 C44 C45
Electrolytic Electrolytic Electrolytic Ceramic Ceramic
C46 C47 C48 C49 C50 C51 C52 C53 C54 C55
sov 50V
50V
CSSA 010M 10 CSSA 3R3M 10 CSSA R22M 25 CKDYF 4032 50 CCDWK 150K 50
Polystyrene film 41 Op 0.01 Ceramic Electrolytic 4 .7 Ceramic 0.04 Ceramic 0.04
50V 50V 25V 50V 50V
COSA 411J 50 CKDYA 103J 50 CEA 4R7P 25 CKDYF 4032 50 CKDYF 4032 50
Ceramic Ceramic Ceramic Ceramic Ceramic
220p 0.01 0.01 3p 0.01
50V 50V 50V SOV 50V
CCDSL 221 K 50 CKDYF 1032 50 CKDYF 1032 50 CCDSH 0300 50 CKDYF 1032 50
C56 C57 C58 C59 C60
Electrolytic Ceramic Ceramic Electrolytic Electrolytic
10 0.01 0.01 0 .1 2 20
16V 50V 50V 35V 16V
CEA lOOP 16 CKDYF 1032 50 CKDYF 1032 50 CS2A OR 1M 35 CEA 221P 16
C61 C62 C63 C64
Electrolytic Ceramic Ceramic Ceramic
47 0.047 47p 0 .01
16V 25V 50V 50V
CEA 470P 16 CKDBC 4732 25 CCDSL 470K 50 CKDYF 103Z 50
I
3 .3 0.22 0.04 15p
10V 10V 25V
sov
OTHER Symbol
Description
Part No.
1Reed relay
ASR-005
SX-1250 12.6 DE-EMPHASIS SWITCH ASSEMBLY (AWX-099)
r-J1
2
• o 0
N
i15,us
L_----=-:__1 SOP
I
I
__j
4 00
AWE -068, No.1
3 AWE -068, No.4
00
AWE-068, No.5
00
2 1
-oo
AWE-068, No.2
C2 1200P o-H--o
C3 150P
o-tt-o S1
."~
l
~
0
~
0
o--tt-o C1 1200P
--''/"
I
Parts List of De-emphasis Switch Assembly (AWX-099) SWITCH
Sl
Part No.
Description
Symbol
Slide switch (DE- EMPHASIS)
ASH-015-0
CAPACITORS Symbol C1 C2 C3
Part No.
Description Mylar Mylar Ceramic
1200p 1200p 15()p
50V 50V 50V
COMA 122J 50 COMA 122J 50 CCDSL 151 K 50
63
2
1
3
12.7 EQUALIZER AMPLIFIER ASSEMBLY (AWF-021)
A
A
IC
'7
a J
8
B
:::s::
B
'
<::i
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0::
:-L
~
C) C)
C) C)
c
.r
N
3
a:::
1 0::
c
2 4
Q,-vQ4
Q5 "-' c: s
C= .·o Q, 1 (;:12
0
2SA850 2SA628A 1S2413
I
__j
WZ-240
0
1 64
2SA126S Q l3 2SC11'lSA Q·4 2SA8'12A c1--. 4 2SC1135 Ds.s 2SC869
2
3
SX-1250
I
1
R31 4-7
O.to 2 SA87'2A 0-8 2SC1175A 4 o------oqv 3r. +b'l20;~'=fl~ O.GV 0 GV' ¥ ~ ~'f.'2~/16 b+ 01 tS2473x2 D2 D4 ln473x2 D3 o.GV o .,. o o .,. o o I~ R o o Ioiii 0 26 220 ~ o---J\/V\r---0 49
~
o-.t ~ C23
~?
-
R2s220 R21 680 o--------~
R2175K
o----J\N\r----0
~ R23'39K
+ en
~
R4t SlK o----J\Nv-----0
~
o-ft--o
o-1 J-o
410/6.'3
49V
<
W!-21' • Ds
100/35
24V
R7
2SC1735
c
24 6V
2SCS69
•
Ct4 27P
470/6.3
o-Il-<>
RB o-------1\1\/v- OV120K 4
~ Q.2 ~726SfN
Rt2 IK
R46 tSK
o-----1\N'v---R4 lOOK o------JIN'v--R2 tOOK o
R3 lOOK G---J\N'v---0 Rt tOOK o
8
(
R37
ZR39
4.7K
• 47K
2SA6Z8A
<>-f t-o
2SA850
R47 15K
5
4
3
2
1
~
Q
Q
Q
Q
0
0
%,
~%
~AWS·094,
c
-
No.20
AWH-048, No.2
AWM-091, No.1
•
R40 150
6
AWH -048, No.3
I
~
7
AWS-094, No.19
R3s 47K
~
C6 68P o
11
B
"''A.~...
C4 47P
C2 1
Ct 1
9
0
O. GV 100/35
<
o--1 t-o
R6 2.2K
~
II
h
220/63
t~~-14~
4&5V 0.6V
o---J\111\r---0 Rto 4.7K
R5 2.2.K
c3 47p
+ Czs 0
R2o'
R14 1.54K
Rn l K
Cs 6SP o
R44 150
o---J\/V\r---0
-o
R?A 39K
9 2?0
o--ft-<>
~Q.l o---J\/V\r---0 R9 4.7K fN2SA7~
o--1 t-o
~
10
~
1 cs
2SA72! ~ \ ~ ~ •
o-t J-<> sv
Ct6 lOP
~ Q. ~21A726S • o---J\/V\r---0 0. 6V
, 49
Q
+ C12
t20l< ~ 5V
~12
Q.
R22 75K
r lOOOP
Ctt +
Ct3 27P
R43 4.1 K
C29
o----'\11/'v---
O~ V
R13 1.54K ov o-------IV\I'v-
o-----'\/Vv--0
~
680 c
b lOOOP
R40 120
~ o---JVVv----0 '
~
410p>-l t--o
2.SCI775A
l c1
R,, 220
47~p_3;-ft--o
R2s
~
.t
220/63
~
1C9
c-z2
A
R34 56 C>---1\/V'v---< C?A o-tt-o 0.0047
Ct6 tOP . . .I. Cto o-t ~ 0 GV Q.G J 3500P b3500P o~&b(Q sv • 2SC1775A Rst'o?K Rt5 Q.s ~ • • - 4& sv >Rts > Rts 75K ........, r-v 75K -,. 9101< ,.
o---f:J--<> c
c
~
Czs 221!6 Cts 3.3/50 o-ft-<> o-ft-<> +R36220K + o---J\NI.r---0
~wo':I8~C3t
......!,'f'
R33 56
c
9
~20K~ lc301 ~t90~~BiV( ~
3
f\z9 47
o---J\NI.r---0 o---J\NI.r---0 c25 22/ IG V0.1 2SC1775A O.s 2SA672A
c113.J/SQ
A
B
I
2
AWR-106, No.13 AWG -042, No.10
AWR· 106, No.ll AWG -042, No. 11
AWS-094, No.23
AWS-094, No.29
D
D
1
I
2
~
3 65
Parts List of Equalizer Amplifier Assembly (AWF-021) SEMICONDUCTORS Part No.
Description
Symbol
Part No.
Description
Symbol
1--
01 02 03 04 05
Transistor Transistor Transistor Transistor Transistor
25A7265·G 25A7265-G 25A7265-G 25A7265-G 25C1775A·D
R26 R27 R28 R29 R30
Carbon Carbon Carbon Carbon Carbon
fi.lm film film film film
220 680 680 47 47
RDY.PS RDY.PS RD%P5 RDY.P5 RDY.P5
06 07 08 09 010
Transistor Transistor Transistor Transistor Transistor
2SC1775A·D 25C1775A·D 2SC1775A·D 25A872A·D 25A872A-D
R31 R32 R33 R34 R35
Carbon Carbon Carbon Carbon Carbon
film film film film film
47 47 56 220k
ROY.P5 470J RO%P5 470J RDY.PS 560J RDY.P5 560J RD%P5 224J
011 012 013 014
Transistor Transistor Transistor Transistor
25C1735-D 2SC869·C 25A850·D 25A628A-C
R36 R37 R38 R39 R40
Carbon Carbon Carbon Carbon Carbon
film film film film film
220k 4.7k 47k 47k 120
RDY.P5 RDY.P5 RDY.PS RDY.P5 RDY.P5
01 02 03 04 05
Diode Diode Diode Diode Zener diode
152473 152473 152473 152473 WZ-240
R41 R42 R43 R44 R45
Carbon film Carbon film Carbon film Carbon film Carbon film
51k 47k 4.7k 150 150
ROY.PS 513J RD%P5 473J RDY.P5 472J RD%P5F 151J RDY.P5F 151J
06
Zener diode
R46 R47
Carbon film Carbon film
15k 15k
ROY.PS 153J RO%P5 153J
-
56
221J 681J 681J 470J 470J
224J 472J 473J 473J 121J
WZ-240
RESISTORS Description
Symbol
Part No.
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
100k 100k 1 OOk lOOk 2.2k
RD%P5 RD%PS RD%P5 RD%P5 RD%P5
104JNL 104JNL 104JNL 104JNL 222J
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
2.2k 120k 120k 4.7k 4.7k
RD%P5 RD%P5 . RD%P5 RD%P5 RDY.P5
222J 124JNL 124JNL 472J 472J
R11 R12 R13 R14 R15
Carbon film Carbon film Metal film Metal film Metal film
lk 1k 1.54k 1.54k 75.0k
R16 R17 R18 R19 R20
Metal film Metal film Metal film Carbon film Carbon film
75.0k 910k 910k 220 220
R21 R22 R23 R24 R25
Carbon film Carbon film Carbon film Carbon film Carbon film
75k 75k 39k 39k 220
66
'hW 'hW '!.W 'hW 'hW '!.W
RD%P5 1 02J RD%P5 102J RN'h5R 1541F RN'h5R 1541 F RN'hSR 7502F RN'!.SR 7502F RN'h5R 91 03F RN%5R 9103F RD%P5 221J RDY.PS 221J RD%P5 753JNL RDY.PS 753JNL RD%P5 393J RDY.PS 393J RD%P5 221J
CAPACITORS Part No.
Description
Symbol C1 C2 C3 C4 C5
Metallized mylar 1 Metallized mylar 1 47p Ceramic 47p Ceramic 68p Ceramic
100V 100V 50V 50V 50V
ACE-008 ACE-008 CC05L 470K 50 CCD5L 470K 50 CCD5L 680K 50
C6 C7 C8 C9 C10
Ceramic Polystyrene Polystyrene Polystyrene Polystyrene
68p film 1000p film 1000p film 3500p film 3500p
50V 50V 50V 50V 50V
CCDSL 680K 50 C05A 102F 50 C05A 102F 50 C05A 352F 50 C05A 352F 50
C11 C12 C13 C14 C15
Electrolytic Electrolytic Ceramic Ceramic Ceramic
470 470 27p 27p 10p
6V 6V 50V 50V 50V
CEA471P6 CEA 471P 6 CCD5L 270K 50 CCD5L 270K 50 CCD5L lOOK 50
C16 C17 C18 C19 C20
Ceramic Electrolytic Electrolytic Mylar Mylar
10p 3.3 3.3 0.0018 0.0018
50V 50V 50V 50V 50V
CC05L lOOK 50 CEANL 3R3P 50 CEANL 3R3P 50 COMA 182K 50 COMA 182K 50
C21 C22 C23
Ceramic Ceramic Mylar
470p 470p 0.0047
50V 50V 50V
CKDYB 471 K 50 CKDYB 471 K 50 COMA 472K 50
BX-1250
Symbol
Description 1--
---
Part No.
-
-
C24 C25
Mylar Electrolytic
0.0047 22
50V 16V
CQMA472K 50 CSZA 220M 16
C26 C27 C28 C29 C30
Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic ·
22 220 220 100 22
16V 63V 63V 35V 16V
CSZA 220M 16 CEA 221P 63 CEA 221P 63 CEA 101P 35 CSZA 220M 16
C31 C32
Electrolytic Electrolytic
22 100
16V 35V
CSZA 220M 16 CEA 101 P 35
67
12.8 FUNCTION SWITCH ASSEMBLY (AWS-094) r - - - - -012
'5
~6
100
~------------------~AAr--------------<)
'6
14 ~~----------------------------~------_. 1l 450---------------------------+-+-------~
440------------,--------------~~--~--~
18 o------------"vVv---- 0 26 o-- - - - - . ·s o---------~~~
21
28 230---------~--~-+----~-----+~ 20 0---------~---+~
24
o-------+~rvv-+--1-0
2'7 C>-----... 28 0----~~~~---.~
R 1 J00
31 33
~---------,
34o------' 3So---------------~ 30 u-------------~ 36G-----------------~-
3~ o---------D
3S u----------------o 3 8 o - - - - - - - - - - () 41
o------------~~-+-+~
22 43
4{)
Parts List of Function Switch Assembly (AWS-094) Part No .
Description
Symbo l S1
Push switch (F UNCT ION)
R1 R2 R3 R4 R5 R6
Carbon Carbon Carbon Carbon Carbon Carbon
C1
Electrolyt ic capaci tor
68
film film film f ilm fi lm film
res1stor reSIStor res1stor res1stor res1stor res1stor
ASG-095
100 100 100 100 100 100 220
RD!4PS RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS 6V
101J 101J 101J 101J 10 1J 101J
CEA 221P 6
42
SX-1250 1
2
3
~ PL 8 (AM)
A AWR-106, No.8
A
~ PL 9 (FM)
AWS-095, No.9
c
2 ,.... 4 ,....
1
0 3
@
PL10(PHONO 1)
@)
PLII (PHONO 2)
@
PL 12 (AUX)
0!) 6 0 8 ~
r-
R6 100
10 0 12,....
~
~
0
~
0
~ ~
AUX
B
0
I
0
0 7 u ~ 011 013
15
*'
II
-@ AUX (R) ~'>WG - 042 ,
014
@) AUX (L)
<>----'IN\r---0
Rs 100
/\WF -021, No.7
016
R• 100
017
rr----+AWF-021, No.4
c 19
WX -097, No.7 WF-021 , No.1
~
i..,i
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0
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0
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PHONO 2
R3100
~
18
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I § PHONO 1 (L)
~
R2 100
~ ~
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0
0
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0
0
PHO NO 1
024 026
9
027 029
300
c
a...i
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0
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0
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AWG -042, No.28
.1lWE-068, No.34
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c
~AWE-068,
No.15 @ PL 13 .li.WE-068, No.7 AWE -068, No.10 AWE -068, No.33
~AWE- 068,
No.37 0\ SIGNAL METER
l
+~
C14
1
--- 100/6 AWE-068, No.17 · /\WE -068, No.22
AWM-089, No.3
AWE-068, No.19
AWG -042, No.26
D
· ~'>WM-089, No.6 ~'>WE -068,
1
WF -021, No.lO
~TUNING METER
."-"
~1--
~
D
AWX-097, No.5
~40
42
L-...
"WF-021, No.6
r-;
C?32
935 i..,i
- @ PHONO 1 (R)
25 v 28
B
r::::WE-068, No.41
~
23
No.18 No.6
~'>WX-097,
2
No.18
3 69
1
2
3
12.9 FLAT AMPLIFIER ASSEMBLY (AWG-042)
.
G;
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<>
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u
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rt
1 70
2
3
SX-1250 1
I
I
2
I
3
I
4
I
5
6 AWX-062, No.6+--------,
AWR -106, No.10
TAPE 2 REC (R) @ ' - - -...
AWE -068, No.39
AWS·094, No.44 + - - - - - ,
AWR -106, No.14
A
A
TAPE 1 REC (R) @----
AWM-091, No.3 ~ AWG-041, ~
AWX-062, No.1+------.
No.2
AWM -089, No.11
TAPE 1 R EC ( L)@ - t - - - - - - - - - - - . TAPE 2 REC (Ll@ - - - - - - . ,
,----+ AWM·089, No.14
-
AWS·094, No.45 r - -
r--r AWG -041, No.9
TAPE 1 PLAY (L) @ - - - - - - ,
•
AWX·062, No.4+AWS·094,
No.14~
AWX-062, No.3+-----,
TAPE 1 PLAY
ADAPTOR IN (R) @:...____----,.-----;§)ADAPTOR TAPE 2 OUT (L) PLAY (R) ADAPTOR OUT (R) ~ r-.DAPTOR TAPE 2 (Q) .J.,. IN (L) PLAY (L .....__. AWF -021 , No.~ @ ©
B
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B
AWF -021, No.2-----.
8
-
9
12 13
R7 4.71<
1
'lSA872A Q.4 0 GV
2SC1715A
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152473 • 2 C7 + o---f.l---o
C16 330P
o-U--o 0
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l[ VR2 50K Rt6 47K
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25 26
27 28 29
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6 72
Parts List of Flat Amplifier Assembly (AWG-042) SEMICONDUCTORS Symbol
Description
--
Part No.
Description
Symbol
Part No.
Q1 Q2 Q3 Q4 Q5
Transistor Transistor Transistor Transistor FET
2SC1775A-E 2SC1775A-E 2SA872A·E 2SA872A-E 2SK30AW·Y
R21 R22 R23 R24 R25
Carbon Carbon Carbon Carbon Carbon
film film film film film
47 47 6.2k 6.2k 47k
RD%PS RD%PS RD%PS RD%PS RD%PS
470J 470J 622J 622J 473JNL
Q6 Q7
as
FET Transistor Transistor
2SK30AW-Y 2SA725-G 2SA725-G
D1 D2 D3 D4
Diode Diode Diode Diode
152473 152473 152473 152473
R26 R27 R28 R29 R30
Carbon Carbon Carbon Carbon Carbon
film fi lm film film film
47k 2.7k 2.7k 820k 820k
RD%PS RD%PS RD%PS RD%PS RD%PS
473JNL 272J 272J 824JNL 824JNL
R31 R32 R33 R34 R35
Carbon Carbon Carbon Carbon Carbon
film film film film film
100 100 130k 130k 1.2k
RD%PS RD%PS RD%PS RD%PS RD%PS
101J 101J 134JNL 134JNL 122J
R36 R37 R38 R39 R40
Carbon Carbon Carbon Carbon Carbon
film film fi lm film film
1.2k 22k 22k 8.2k 8.2k
RD%PS RD%PS RD%PS RD%PS RD%PS
122J 223J 223J 822J 822J
R41 R42 R43 R44 R45
Carbon Carbon Carbon Carbon Carbon
film film film film film
75k 75k 10k 10k 3.9k
RD%PS RD%PS RD%PS RD%PS RD%PS
753JNL 753JNL 1 03J 103J 392J
R46 R47 R48
Carbon film Carbon film Carbon film
3.9k 22k 22k
RD%PS 392J RD%PS 223J RD%PS 223J
I
SWITCHES Symbol 51 52 53
Description
55
Lever Lever Lever Lever Lever
S6 57
Lever switch (MUTING) Lever switch (LOUDNESS)
S4
switch switch switch switch switch
(DUPLICATE) (MONITOR 1) (MONITOR 2) (ADAPTOR) (MODE)
Part No.
.
ASK-084 ASK-092 ASK-092 ASK-092 ASK-090 ASK-090 ASK-090
RESISTORS Symbol
Description
VR1 VR2
Variable ( 1OOk·HB BALANCE) Variable (50k-B2 VOLUME)
ACV-163 ACV·169
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
2.2k 2.2k 2.2k 2.2k 2.2k
RD%PS RD%PS RD%PS RD%PS RD%PS
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
2.2k 4.7k 4.7k 330k 330k
RD%PS 222J RD%PS 472J RD%PS 472J RD%PS 334JNL RD%PS 334JNL
R11 R12 R13 R14 R15
Carbon Carbon Carbon Carbon Carbon
film film film film film
330k 330k 1k 1k 1k
RD%PS RD%PS RD%PS RD%PS RD%PS
R16 R17 R18 R19 R20
Carbon film Carbon film Carbon film Carbon film Carbon film
1k 1.1 k 1.1 k 47 47
RD%PS 102J RD%PS 112J RD%PS 112J RD%PS470J RD%PS470J
73
Part No.
222J 222J 222J 222J 222J
334JNL 334JNL 102J 102J 102J
CAPACITORS Symbol
Description
C1 C2 C3 C4 C5
Metallized Metallized Metallized Metallized Ceramic
C6 C7 C8 C9 C10
mylar mylar mylar mylar
Part No.
1 1 1 1 0.01
100V 100V 100V 100V 500V
ACE-008 ACE-008 ACE-008 ACE-008 CKDYF 1032 500
Ceramic Electrolytic Electrolytic Electrolytic Electrolytic
0.01 330 330 22 22
500V 63V 63V 16V 16V
CKDYF 1032 500 CEA 331P 63 CEA 331 P 63 CS2A 220M 16 CS2A 220M 16
C11 C12 C13 C14 C15
Electrolytic Electrolytic Mylar Mylar Ceramic
22 22 0.22 0.22 330R
16V 16V 50V 50V 50V
CS2A 220M 16 CS2A 220M 16 CQMA 224J 50 COMA 224J 50 CKDYB 331 K 50
C16 C17
33()p Ceramic Metallized mylar 1
50V 100V
CKDYB 331 K 50 ACE-008
Symbol f-- C18 C19 C20
Description
Part No.
Metallized mylar 1 56p Ceramic 56p Ceramic
100V 50V 50V
ACE-008 CCDSL 560K 50 CCDSL 560K 50
C21 C22 C23 C24 C25
Electrolytic Electrolytic Ceramic Ceramic Ceramic
100 100 68p 68p 10p
10V 10V 50V 50V 50V
CEANL 101P 10 CEANL 101P 10 CCDSL 680K 50 CCDSL 680K 50 CCDSL 1 OOF 50
C26 C27 C28 C29 C30
Ceramic Electrolytic Electrolytic Ceramic Ceramic
1()p 220 220 0 .04 0.04
50V 16V 16V 50V 50V
CCDSL 100F 50 CEANL 221 P 16 CEANL 221 P 16 CKDYF 403Z 50 CKDYF 403Z 50
C31 C32
Electrolytic Electrolytic
330 330
35V 35V
CEA 331P 35 CEA 331P 35
OTHERS Symbol
Description Screw Union nut Washer faced nut
74
.
Part No . ABA-116 ABN-021 ABN-024
SX-1250 12.10 5P CONNECTOR ASSEMBLY (AWX-062)
L REG
::s::
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AWG-042, No.24
1
-
2
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TAPE 2 REC (L) AWG-042, No.17
1
@ TAPE 2 PLAY (L)
l
@ TAPE 2 PLAY (R)
r
§) TAPE 2 REC (R)
AWG-042, No.19
~
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AWG-042, No.29
Parts List of 5P Connector Assembly (AWX-062) Symbol R1 R2 R3 R4
Description Carbon Carbon Carbon Carbon
folm film folm film
resistor resistor resistor resistor
Part No. 390k 390k 100k 100k
Connector socket 5p (REC/PLAY)
RDY.PS ROY.PS RDY.PS RDY.PS
394J 394J 104J 104J
AKP-007
75
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4'7K C46
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C23 124K
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Parts List of Control Amplifier Assembly (AWG-041) SEMICONDUCTORS Symbol 01 02 03 04
Desc.ription
Part No.
Transistor Transistor Transistor Transistor
2SC 1312-G 2SC 1312-G 2SC 1312-G 2SC1312-G
RESISTORS AND POTENTIOMETERS Symbol VR1 VR2 VR3 VR4
Description
Part No.
Variable res istor (1 02k, 5·step, BASS 50Hz) Variable resistor ( 102.6k, 11 -step, BASS 1OOHz) Variable resistor (1 02k, 5-step, TREBLE 20kHz)
ACV- 165 ACV-166 ACV-168
Variabl e r esistor (99k, 11 -step, TREBLE 1OkHz)
ACV- 167
R1 R2 R3 R4 R5
Carbo n Carbon Carbon Carbon Carbon
film f ilm film film f ilm
lOOk lOOk 47k 47k 33k
RDY.PS RDY.PS RDY..PS RDY.PS RDY.PS
104J 104J 4 73J 473J 333J
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film fil m film
33k 8.2k 8 .2k 47k 47k
RDY.PS R DY.PS RDY.PS RDY.PS RDY.PS
333J 822J 822J 473J 473J
R11 R12 R13 R14 R15
Carbon Carbo n Carbon Carbon Carbon
film film film film film
33k 33k 100k 100k 220k
RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS
333J 333J 104JNL 104JNL 224JN L
R 16 R 17 R18 R19 R20
Carbon Carbon Carbon Carbon Carbon
film film film film film
220k 4.7k 4.7k 6.8k 6.8k
RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS
224JNL 472J 472J 682J 682J
R21 R22 R23 R24 R25
Carbo n Carbon Carbon Carbon Carbon
film f ilm film film tilm
24k 24k 11 k 11 k 10k
RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS
243J 243J 113J 113J 103J
R26 R27 R28 R29 R30
Carbon Carbon Carbon Ca rbon Carbon
film film fi lm f ilm film
10k 24k 24k 11 k 11 k
RDY.PS RDY.PS RDY.PS RDY.PS RDY. PS
103J 243J 243J 11 3J 113J
R31 R32 R33
Carbon film Carbon film Carbon film
l OOk 100k 220k
RDY.PS 104JNL RDY.PS 104JN L RDY.PS 224JN L
78
-
Symbol
Description
Part No.
R34 R35
Carbon film Carbon film
220k 4.7k
RD Y.PS 224JNL R DY.. PS 472J
R36 R37 R38 R39 R40
Carbon Carbon Carbon Carbon Carbon
film f ilm film film f ilm
4.7k 6.8k 6.8k l OOk lOO k
RDY.PS RD Y.PS RDY. PS RDY. PS RDY.PS
472J 682J 682J 104J 104J
R41 R42 R43 R44 R45
Carbon Carbon Carbon Carbon Carbon
fi lm film film f ilm film
2.2k 2.2k 2.2k 2.2k 1k
RDY.PS RDY.PS RDY.PS RDY. PS RDY.PS
222J 222J 222J 222J 102J
R46
Carbon film
1k
RDY.PS 102J
CAPACITORS Symbol
Description
Part No.
Cl C2 C3 C4 C5
Electrolytic Electrolytic Electrolytic Electrolytic Mylar
4 .7 4.7 4 .7 4.7 0.056
25V 25V 25V 25V 50V
CSZA 4R7M CSZA 4R7M CSZA 4R7M CSZA 4R7M COMA 563J
C6 C7 C8 C9 C10
Mylar Mylar Mylar Polystyrene Polystyrene
0.056 0.056 0 .056 390p 390p
50V 50V 50V 50V 50V
COMA 563J 50 COMA 563J 50 COMA 563J 50 COSA 391J 50 COSA 39 1J 50
C1 1 C12 C13 C14 C15
Electrolyt ic Electrolytic Electrolytic Electrolytic Cerarylic
2.2 2.2 2.2 2.2 12p
25V 25V 25V 25V 50V
CEAN L 2R2P CEANL 2R2P CEAN L 2R2P C EANL 2R2P CCDSL 120K
C16 C17 C18 C19 C20
Ceram ic Electrolytic Electrolytic Electrolytic Electro lyt ic
12p 100 100 2.2 2.2
50V 10V 10V 25V 25V
CCDSL 120K 50 ACH -3 12 ACH -3 12 CEAN L 2R2P 25 CEANL 2R2P 25
C21 C22 C23 C24 C25
My lar Mylar My lar Mylar Ceramic
0.0 18 0.018 0.018 0.018 2200p
50V 50V 50V 50V 50V
COMA 183J 50 COMA 183J 50 COMA 183J 50 COMA 183J 50 CKDY A 222J 50
C26 C27 C28 C29 C30
Ceramic Electrolytic Electrolytic Electrolytic Electrolytic
2200p 2.2 2.2 2.2 2.2
50V 25V 25V 25V 25V
CKDY A 222J 50 CEAN L 2R2P 25 CEAN L 2R2P 25 CEAN L 2R2P 25 CEANL 2R2P 25
25 25 25 25 50
25 25 25 25 50
SX-1250
Symbol
Part No.
Description
C31 C32 C33 C34 C35
Ceramic Ceramic Electrolytic Electrolytic Electrolytic
12p 12p 100 100 2.2
50V 50V 10V 10V 25V
CCDSL 120K 50 CCDSL 120K 50 ACH-312 ACH ·312 CEAN L 2R2P 25
C36 C37 C38 C39 C40
Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic
2.2 100 100 100 100
25V 16V 16V 16V 16V
CEANL 2R2P 25 ACH ·31 1 ACH·31 1 ACH-311 ACH-311
C41 C42 C43 C44 C45
Ceramic Ceramic Electrolytic Electrolytic Mylar
470p 470p 10 10 0.068
50V 50V 25V 25V 50V
CKDYB471K50 CKDYB471K50 CSZA 100M 25 CSZA 100M 25 COMA 683J 50
C46
Mylar
0.068
50V
COMA 683J 50
OTHERS Symbol
Description Lever switch (TON E) Washer faced nut
Part No. ASK-090 ABN·024
79
2
1
3
12.12 FILTER AMPLIFIER ASSEMBLY (AWM-089)
A
A
MUTOUT
2
'7
3
4
5
MUT
IN
13
~------~----~~D T 8 I
11_) - - - - - {
25V 14
10 Output
B
L
B
3
G 15 I
11
-B 12 -2.5V
17
c
8 Output
c
R
Input 16 R J-o Cs
L_O I c'l
I
-~ TRANSISTORS
SWITCHS LOW FILTER sl HIGH FILTER Sz MULTI PATH FM MUTI NG
Ql , Gz
s3 s4
D
1 so
I
2.SC1313 x2 ( 2SC1345 ) D
2
3
SX-1250
I
1
I
2
3
I A
A
-
. - - - - - - - - - - - - - - - - - - - - + = =: ; - - - - - +AWE -068, No.38 1
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O2
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10 2
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30K
12 o---t-- - - - - + AWG -041 , No.7
~1 4.;.!.._+-------+AWG-042, No.4 o
~
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No.5
c
:o-:-= :-!- - - - - - - + AWG -041 , No.6
•oo•
1 <>---ANV----0
R~ 3 0K
R1 4 70K
D
D
1
I
2
I
3 8 1
Parts List of Filter Amplifier Assembly (AWM-089) SEMICONDUCTORS Symbol
Oeser ipt ion
01
Transistor
02
Transistor
Part No. 2SC1313-G (2SC1345·DI 2SC1313-G (2SC 1345-Dl
SWITCHES Oeser ipt ion
Symbol S1-4
Push switch
--
(LOW FILTER, HI G H Fl L TER, MULTI PATH, FM MUTING)
Part No.
ASG-098
RESISTORS Symbol
Descript ion
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film f il m fi lm
470k 100k 5. 1 k 4.7k 2 .2k
R6 R7 RB R9 R10
Carbon Carbon Carbon Carbon Carbon
f ilm film film f il m film
R11 R12 R13 R14 R15
Carbon Carbon Carbo n Carbon Carbon
R16 R17 R18 R19 R20
Carbon Carbon Carbon Carbon Carbon
R2 1 R22
Carbon film Carbon film
Part No. RDY.PS RDY.PS RDY.PS RDY. PS RDY.PS
4 74J 104JNL 5 12J 472J 222J
1M 1M 30k 30k 1k
RD'!.PS RD'!.PS RD'!.PS RD'!.PS RDY.PS
105J 105J 303J 303J 102J
f il m film film film film
220k 470k 100k 5.1 k 4.7k
RD'!.PS RDY.PS RD'!.PS RD'!.PS RD'!.PS
224J 474J 104JNL 5 12J 472J
f il m f ilm fi lm f ilm film
2.2k 1M 1M 30k 1k
RD'!.PS RD'!.PS RD'!.PS RD'!.PS RD '!. PS
222J 105J 105J 303J 102J
30k 220k
RD'!.PS 303J RD'!. PS 224J
-
CAPACITORS Symbol
Description
Part No.
C1 C2 C3 C4 C5
Mylar My lar Electrolytic Ceramic Ceramic
0.1 0 .1 4.7 5600p 2700p
50V 50V 25V 50V 50V
COMA 104J 50 COMA 104J 50 CSZA 4 R7M 25 CKDY A 562J 50 CKDY A 272J 50
C6 C7
Electro ly tic My lar
10 0.1
25V 50V
CSZA 100M 25 COMA 10 4J 50
82
Symbol
D escription
Part No.
CB C9 C10
Mylar Electrolyt ic Ceramic
0.1 4.7 5600.,
50V 25V 50V
COMA 104J 50 CSZA 4R7M 25 CKDY A 562J 50
C11 C12
Ceram ic Electrolyt ic
2700p 10
50V 25V
CKDY A 272J 50 CSZA 100M 25
SX-1250 12.13 MICROPHONE JACK ASSEMBLY (AWX-097) 1 -~
.--------------------06
., 3
_ _ _ _ jI 2
1 00047 1
,. Dr
•
I
0
0 0
1r t
Rl lBOK
1
~
[f"
R3 33K
R2
0
r
b
•
0
Cl 0.0047
1.
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C4 0.0027
@ PHONO 2 (R)
().2
@ PHONO 2 (L)
~
03
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1,,
180K
o-H-..,
Rs 180K
().1
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Jr.
().5
t" t" 33 K
180K
AWS -094, No.2 7 AWS-094, No.18
"'
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AWS-094, No.21
Parts List of Microphone Jack Assembly (AWX-097) CAPACITORS
Oeser iption
Symbo l
Part No .
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film f ilm film film
180k 180k 39k 39k 180k
RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS
R6
Carbon fil m
180k
RDY.PS 184JNL
Mylar Mylar Mylar Mylar Ceramic
C1 C2 C3 C4 C5
184J NL 184JNL 393JNL 393JN L 184JNL
Part No.
Description
Symbo l
RESISTORS
4700p 4700p 2700p 2700p 0.04
50V 50V 50V 50V 50V
COMA 472J 50 COMA 472J 50 COMA 272J 50 COMA 272J 50 CKDYF 403Z 50
OTHER Symbol
-
I
I
Description Phone j ack ( M I C)
Part No. AKN-013
8 3
J>
"tt
0
:E
......
m ...... :::0
J>
s: "tt
r
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w
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SX-1250 1
2
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AWM -09 1, No. 13 (AWR-106, No. 1) + - --
-
....---
...,__--,
.--+----+---+AWM-091, No. 12 (AWR -106, No.2)
A
A WM-09 1, No.6 (No.9)
07 o9
B
B
. T410/&o r c.~ c
C•s 0041
o---1 1--<>
+f 410/80 C16
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Cs
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WM -091, No.5 t -- - - l>AWR-106, No.13 '--~AWF - 021, No.3 t -- --+AWR -106, No. 10 t -- - - l>AWF-021, No.8
D
D
1
2
3 85
Parts List of Power Amplifier Assembly (AWH-048) SEMICONDUCTORS Symbol
Description
Part No.
01 02 03 04 05
Transistor Transistor Transistor Transistor Transistor
2SA750-E 2SA750-E 2SC1439-B 2SC1439-B 2SA858-B
06 08 09 010
Transistor Transistor Transistor Transistor Transistor
2SA858-B 2SC1904A·B 2SA899A-B 2SD61 0-R 2SB630· R
011
Transistor
2SC869-C
D1 D2 D3
V aristor Varistor Diode
D4
Diode
STV-3H STV-3H 151886 (SIB01 ·02) 1S1886 (SIB01-02)
D5 D6
Diode Diode
D7
Diode
DB D9 D10
Diode Diode Diode
D11
Diode
Q7
152473 1S1886 (51801-02) 1S1886 (SIB01 ·02)
-
152471 152471 151886 (SIB01-02) 151886 (SIB01-02)
Description
Part No. -
86
Description
Part No.
R19 R20
Carbon film Carbon film
47 620
RD%PS 470J RD%PSF 621J
R21 R22 R23 R24 R25
Carbon film Carbon film Carbon film Metal oxide Metal oxide
100 100 10k 100 100
RD%PSF 101J RD%PSF 101J RD%PS 103J RS1PF 101J RS1PF 101J
R26 R27 R28 R29 R30
Metal oxide Metal oxide Wire wound Wire wound Carbon film
1k 1k 0.5 0.5 22
R31 R32 R33 R34 R35
Carbon film Wire sound Wire wound Carbon film Carbon film
22 0.5 0.5 22 22
R36 R37 R38 R39 R40
Metal film Metal film Metal oxide Metal oxide Carbon film
4.7 4.7 10 10 1.2k
R41 R42 R43
Carbon film Carbon film Carbon film
1.2k 13k 13k
Semi-fixed Semi·fixed
470-B 470-B
VR1 VR2
1W 1W 1W 1W 5W 5W
I I
RS1PF 102J RS1PF 102J RT5B OR5K RT5B OR5K RD%PSF 220J RD%PSF 220J RT5B OR5K RT5B OR5K RD%PSF 220J RD%PSF 220J
5W 5W
1W 1W 2W 2W
RN1H 4R7K RN1H 4R7K RS2P 100J RS2P 100J RD%PSF 122J I
RD%PSF 122J RD%PS 133J RD%PS 133J A-033 A-033
CAPACITORS
RESISTORS Symbol
Symbol
-
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
3.3k 220k 82 47k 47k
---1 RD%PS 332J RD%PS 224JNL RD%PS 820J RD%PS 473JN L RD%PS 473JNL
R6 R7 RB R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
82 62k 200k 100 100
RD%PS RD%PS RD%PS RD%PS RD%PS
R11 R12 R13 R14 R15
Carbon Carbon Carbon Carbon Carbon
film film film film film
16k 16k 1.5k 62k 220
RD%PS 163J RD%PS 163J RD%PS 152J RD%PS 623JNL RD%PSF 221J
R16 R17 R18
Carbon film Carbon film Carbon film
220 1k 47
RD%PSF 221J RD%PSF 102J RD%PS 470J
820J 623JNL 204JNL 101J 101J
Symbol -
Description
Part No.
f--
C1 C2 C3 C4 C5
Metallized mylar 1 Electrolytic 10 47p Ceramic Ceramic 120p Electrolytic 220
100V 16V 50V 50V 16V
ACE-008 CEANL lOOP CCDSL 470K CCDSL 121 K CEANL 221P
Ceramic Ceramic Mylar Ceramic Ceramic
4 7p 10p 0.1 47p 47p
500V 500V 50V 500V 500V
CCDSL 470K 500 CCDSL tOOK 500 COMA 104J 50 CCDSL 470K 5€10 CCDSL 4 70K 500
C11 C12 C13 C14 C15
Electrolytic Mylar Ceramic Ceramic Electrolytic
0.22 0.039 0 .047 0.047 470
10V 250V 150V 150V 80V
CSZA A 22M ·10 COMA 393J 250 ACG-009 ACG-009 ACH-038
C16 C17 C18
Electrolytic Ceramic Ceramic
470 0.047 0.047
80V 150V 150V
ACH-038 ACG-009 ACG-009
C6 C7 CB C9 C10
I
16 50 50 16
SX-1250
OTHERS Symbol
Description
Part No.
L1
.
Heat sink AF choke coil 2.2SJ H Transistor socket Insulator wafer strip (3p, L-type)
ANH-237 T63-009 AKH-002 AEC-088 AKM-024
strip (4p) strip (3p)
AKM-034 AKM-033
87
12.15 SPEAKERS SWITCH ASSEMBLY (AWS-095)
ON
n
n---
14S 0 A
OFi=" i5SPB
--x----I---l
13
--~~--
16SPC
I
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'2 I
L _ __ 1
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5
8
Parts list of Speakers Switch Assembly (AWS-095) Symbol
Description
Part No.
S1
Push swi tch (SPEAKERS)
Rl R2
Metal oxide resistor Metal oxide resistor
J1
Phone jack (PHON ESl
BB
150 150
ASG -094 3W 3W
RS3P 151K RS3P 151K AKN-010
4
2.
3
SX-1250 1
2
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No.7
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No.1
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~0~
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S51 51 R
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~I
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22,000/80
AWG-042, No . 2 + - - -... AWR -106, No.14 +------' AWR-107 , No.12 +----~
VLT
---4 AWH-048, No . 12 '----~ AWH - 048,
AWR-106, No.11 +-------. AWH -048, No.3 + - - - - . AWF -021, No.8 +------'
No . 15
- - +AWH -048, No . 13 (L) AWS-095, No . 8 '-----~A WS - 095, No.1 L....__ _ _-4AWH-048, No.13 (R)
D
1
2
D
3 91
SX-1250 Parts list of Protection Circuit Assembly (AWM-091) SEMICONDUCTORS
CAPACITORS
Symbol f-01
Transistor
02
Transistor
Q3
Transistor
04
Transistor
05
Transistor
06
Transistor
Dl D2 D3 D4 D5
Diode Diode Diode Diode Diode
152473 1S2473 1S2471 1S2473 1S2473
Diode Diode
S5151R S5151
D6 D7
Description
I
I
Part No. 2SC945A·O (2SC1647-P) 2SC945A-0 (2SC1647-P) 2SA733·0 2SC945A-0 (2SC1647-P) 2SC1166-Y (2SC 1384-0) 2SC1166-Y (2SC1384-0)
-
Symbol
I
Description
Part No.
1-
f-
-
C1 C2 C3 C4 C5
Electrolytic Electrolytic Electrolytic Electroly t ic Electrolytic
470 470 4.7 100 100
6V 6V 25V 16V 50V
CEA471P6 CEA 471P 6 CEA 4R7P 25 CEA101P16 CEA101P50
C6 C7 C8 C9 C10
Electrolytic Ceramic Ceramic Ceramic Ceramic
100 100p O.Q1 0.01 0.01
50V 50V 150V 150V 150V
CEA101P50 CCDSL 101 K 50 ACG-004 ACG-004 ACG-004
C1 1
Ceramic
0.01
150V
ACG-004
OTHERS Symbol Sl
Description Relay strip (3p, L-type) strip (5p, L -type)
Part No. ASR-0 10 AKM-024 AKM-025
RESISTORS Symbol
Description
Part No.
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
75k 75k 2.2k 82 82
R DY..PS RDY..PS RDY..PS RDY..PS RDY..PS
753J 753J 222J 820J 820J
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
10k 15k 15k 2.2k 150k
RDY..PS RDY..PS RDY..PS RDY..PS RDY..PS
103J 153J 153J 222J 154J
R11 R12 R13 R14 R15
Carbon Carbon Carbon Carbon Carbon
film film film f ilm film
15k 15k 68k 9 1k 12k
RDY..PS RDY..PS RDY..PS RDY..PS RDY..PS
153J 153J 683J 913J 123J
R16 R17 R18 R1 9 R20
Carbon film Carbon film Carbon film Carbon film Metal oxide
68k 22 15k 2.2k 220
RDY..PS 683J RDY..PS 220J RDY..PS 153J RDY..PS 222J RS1P211J
R21 R22 R23 R24 R25
Carbon film Carbon film Metal oxide Metal oxide Metal oxide
5.6k 6.8k 680 3.3k 3.3k
I
I
1W
2W 3W 3W
RDY..PS 562J RDY..PS 682J RS2P 681J RS3P 332K RS3P 332K
92
1
2
3
I
12.17 STABILIZER ASSEMBLY (AWR-106)
A
QL 2$C86S
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AWH-048, No.3 +---------. AWM -091, No.1 AWF-021. No.8 +---- - - ' AWH-048, No.2 WF-021, No.3 .----l>AWG -042, No.2 WM -091, No.3 '-----4-AWR -107, No. lO
D
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AWH -048, No.12 +-----' AWH-048, No.15 '-----l""'WR-107, No.9 '----~AWR- 10 7, No.8 ...._-------#\WS-094, No.1 '-----~AWS-095, No.9 ..----=---~AWE -068, No.15 't--t' Cl 't-orr-----+AWE -068, No.7 '-----~MWS-094, No.32 t - - -- - - - +.AWE-068, No.39 '--------;..,....WG-042, No.1
2
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SX-1250 Parts List of Stabilizer Assembly (AWR-1 06) SEMICONDUCTORS Symbol
Description
Part No.
Symbol
Description
P;ort No.
1--Transistor Tra nsistor Transistor Transistor Transistor
2S D313P-E 2SC869-D 2SC1318-R 2SC1384-R 2SB507P-E
08 09 010
Transistor Transistor Transistor Transistor Transistor
2SA628A-D 2SA720-R 2SA684A·R 2SD325R·E 2SC945A-R
011 012 013
Transistor Transistor Transistor
D1 D2 03 D4 D5
Zener diode Diode Zener diode Diode Zener diode
D6 D7 DB
Diode Diode Diode
01
02 03 04 05 06 Q7
-
Symbol R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
2.7k 2.7k 2.7k 2.7k 8.2k
R6 R7 RB R9 R10
Carbon film Carbon film Carbon film Carbon film Carbon film
8.2k 1k 1k 22k 22k
R11 R12 R13 R14 R15
Carbon film Carbon film Metal oxide Metal oxide Metal oxide
16k 16k 680 1.5k 3.3k
R16 R17 R18 R19 R20
Metal oxide Carbon film Metal oxide Carbon film Carbon film
3.3k 3.9 100 1.5k 1.5k
R21 R22 R23
Carbon film Carbon film Carbon film
1k 1k 1k
I
3W 3W 'h.W 2W
RDY.PS 162J RDY.PS 152J
VR1 VR2
Semi-fixed Semi-fixed
4.7k-B 4 .7k-B
A-034 A-034
CAPACITORS Symbol
Description
Part No.
2SC945A·R 2SD325R-E 2SC945A·R
220 220 82p 82p 47
BOV BOV 500V 500V 35V
CEA 221P 80 CEA 221 P 80 CCDSL 820K 500 CCDSL 820K 500 CEA 470P 35
WZ-240 1S2473 WZ-240 1S2473 WZ-061
C6 C7 CB C9 C10 .
Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic
47 22 22 100 100
35V 50V 50V 35V 35V
CEA 470P 35 CEA 220P 50 CEA 220P 50 CEA 101P 35 CEA 101P35
1S2473 S5151R S5151
C11 C12 C13 C14 C15
Electrolytic Electrolytic Electrolytic Ceramic Electrolytic
47 47 1000 82p 47
BOV BOV 25V 50V 10V
CEA470P 80 CEA470P 80 CEB 102P 25 CCDSL 820K 50 CEA470P 10
C16 C17 C18 C19 C20
Electrolytic Electrolytic Electrolytic Electrolytic Ceramic
22 220 47 47 0.01
10V 16V 10V 10V 150V
CEA 220P CEA 221P CEA 470P CEA 470P ACG-004
C21 C22 C23
Ceramic Ceramic Ceramic
O.Ql 0.01 0.01
150V 150V 150V
ACG-004 ACG-004 ACG-004
RDY.PSF 272J RDY.PSF 272J RDY.PS 272J .RDY.PS 272J RDY.PS 822J RDY.PS RDY. PS RDY.PS RDY.PS RDY.PS
2W 2W
1.6k 1.5k
Electrolytic Electrolytic Ceramic Ceramic Electrolytic
Part No.
Description
Carbon film Carbon film
C1 C2 C3 C4 C5
RESISTORS
- - - 1--
R24 R25
822J 102J 102J 223J 223J
RDY.PS 163J RDY.PS 163J RS2P 681 K RS2P 152K RS3P 332K RS3P 332K RD'h.PSF 3R9J RS2P 101 K RDY.PS 152J RDY.PS 152J
10 16 10 10
OTHERS Description
Symbol
J--- - + - -
l
Part No.
Heat sink Heat sink Transistor socket Insulator wafer strip (3p, L -type)
ANH -237 ANH -300 AKH-002 ACE-088 AKM -024
strip (5p, L-type)
AKM-025
RDY.PS 102J RDY.PS 102J RDY.PS 102J
95
12.18 POWER SUPPLY ASSEMBLY (AWR-107)
~~
uo r <:t
4
R4 '2· ~ 21'1)
10
-81.SV
8
23V
Cro
0.01 /1~0V
Ds. DG
SIB01-0l x2
s
li)
U)
N
N
0>
c:s-....... C::h
u
-.......
+
r
0
t
"
'<1
5
~
1SA-'2SV
11
·~
I
~12
01/150'.'
I
I
Parts List of Power Supply Assembly (AWR-1 07) SEMICONDUCTORS Symbol
CAPACITORS
I
Description
-
D1 D2 D3 D4 D5
Diode Diode Diode Diode Diode
SIBOl-04 SIBOl-04 SIBOl-04 SIB01-04 SIBOl-01 (1S1885)
D6
Diode
SIBOl-01 (1S1885)
I
Symbol
Part No.
Description
t-
R1 R2 R3 R4
Description
0.01 0.01 0.01 0.01 0.01
250V 250V 250V 250V 150V
CG-001 ACG-001 ACG-001 ACG-001 ACG-004
C6 C7
Electrolytic Electrolytic Electrolytic Electrolytic Ceramic
470 470 470 470 0.01
100V 100V 25V 25V 150V
CEB 471 P 100 CEB471P100 CEA 471P 25 CEA 471 P 25 ACG-004
cs C9 C10
Wire wound Metal oxide Metal oxide Metal oxide
3.3 2.2K 10 10
Part No. 20W 2W 2W 2W
ACN·003 RS2P 222J RS2P 100K RS2P lOOK
OTHERS Symbol
I
I
96
PartNo.
Ceramic Ceramic Ceramic Ceramic Ceramic
RESISTORS Symbol
~~
C1 C2 C3 C4 C5
Description
Part No.
Fuse clip Fuse clip
AKR-013 AKR-030
MICROTEMP
AEX-005
-
SX-1250
___________2__________~L_
~--------1 ----------~L_
__________
~3__________
A
A
C1
+
4701100
c. o~nttso o---i I--<> 0~
$1801·04
SlBOI 01
14
SliiOHI4
51801 04
°
,_
~
C5 0011'50
<>---it-
"'""'~ ~ '"""'
o, SlBOl-Ql 14
0
R!
H C20W )
B
B R4 10 CZNI ~
11
10
9
5
2
3
AWR -106, No.7 AWR -106, No.6 '-----~AW R -106,
No. 15
c
c
OR
GRN BRN
OR
BLU
..._----~AWX -096 , '----~ AWM-09 1 ,
No.2
AC 120V 60Hz
No.2
D
D
1
2
3 97
13. PACKING
Side pad L AHA-107
Sheet AHG-037
Operating instructions ARB-164 .
FM T-type antenna ADH -002 Hexagonal wrench ANK-018
<J
1nside packing AHC-026
Packing case AHD-341 (English) AHD-342 (English/ French)
98
SX-1250
14. PARTS LIST OF EXPLODED VIEWS Parts No.
Parts Name
Parts No.
Parts Name
AAA-034 AAB-100 AAB-104 AAD-113 AAD- 114
Knob Knob Knob Knob Knob
ApX-038 ADX-039 AEB-085 AEB-086 AEB-087
Cable Housing Cable Housing Rubber Bracket A Rubber Bracket B Rubber Spacer
AAF-051 AAG·106 AAP-037 AAT-025 AAT-026
Dial Pointer Dial Scale Plate Blind Sash Shaft Cover Ind icator
AEC-076 AEC-079 AEC- 101 AEC-15 1 AEC- 178
Insu lator Wafer Strain Rei ief Pulley Wire er Foot
AAT-027 AAT-028 AAW-040 ABA-002 ABA-012
Indicator Indicator Double Meter Screw Screw
AEC-256 AEC-258 AEC-272 AED-0 18 AEK-104
Pulley Spacer Acrylic Board Mask Fuse (1 .5A) (KCU, S)
ABA-081 ABA-087 ABA-1 13 ABA-114 ABA-116
Screw Screw Screw Pulley Shaft Screw
AEK-106 AEK-109 AEK-301 AEK-402 AEK-404
Fuse Fuse Fuse Fuse Fuse
Screw Screw Washer Washer Coil Spri ng
AEK-405 AEL-056 AEL-069 AEL-072 AEL-073
Fuse (1.6A) (HG) Lamp Ass Lamp L amp Lamp
ABN-021 ABN-022 ABN-023 ABN-024 ACG-001
Nut Base Washer Faced Nut Washer Faced Nut Capacitor (HG, S)
AEL-074 AEL-075 AEL-076 AHA-107 AHA-108
Lamp Lamp Lamp Side Pad L Side Pad R
ACG-003 ACH-056 ACV-163 ACV- 165 ACV-166
Capacitor (KCU) Capacitor Variable Resistor Variable Resistor Variable Resistor
AHC-026 AHD-341 A HD-342 AHG-037 AKA-004
Inner Packing Packing Case (KU, S, HG) Packing Case (KC) Sheet Terminal
ACV-167 ACV-168 ACV-169 ADG-013 ADG-015
Variable Resistor Variable Resistor Variable Resistor AC Power Cord (KCU) AC Power Cord (S)
AKB-019 AKB-030 AKB-033 AKC-030 AKC-038
Terminal Ter minal Terminal Terminal Strip 2P Terminal Strip 2P
ADH-002 ADX-029 ADX-030 ADX-031 ADX-032
FM Antenna Cable Housing Cable Housing Cable Housing Cable Housing
AKE-01 2 AKE-014 AKF-053 AKH-001 AKN-010
Terminal Terminal Connecting Plate Transistor Socket Phone Jack
ADX-033 ADX-034 ADX-035 ADX-036 ADX-037
Cable Cable Cable Cable Cable
AKN-013 AKP-005 AKP-007 AKP-008 AKR-028
Phone Jack AC Socket (KCU, S) 5P Connector Socket AC Socket (HG) Fuse Ho lder 1P
ABA-123 ABA-129 ABE-006 ABE-018 ABH -022
.
Housing Housing Housing Housing Housing
I
(1A) (KCU, S) (6A) (S) (12Al (KCU , S) (1A) (HG) (6.3A) (HG)
99
Parts No. AKR-031 AKX-031 AMM-049 ANB-386 ANE-105 ANK-018 ARB-164 ARB-168 ARB-171 ARD-089
-- --
...
Parts Name Plug in Selector Plug in Selector Wooden Cover Front Ass Top Hexagonal Wrench Operating In struction Operating Instruction Operating lnstructton Operating I nstructton
ASG-094 ASG-095 ASG-098 ASH-015 ASK-080
Push Switch Push Switch Push Switch Slide Switch Power Switch (KCU)
ASK-084 ASK-090 ASK-092 ASK-099 ASK-105
Lever Switch Lever Switch Lever Switch Power Switch (S) Power Switch (HGI
ASR-015 A TB-051 ATT-267 ATT-291 ATT-295
Relay · Ferrite Bar Antenna Power Trans (KCU) Power Trans (S) Power Trans (HF)
AWB-023 AWE-068 AWF-021 AWG-041 AWG-042
FM Front End Tuner Ass EO Amp Ass Control Amp Ass Flat Amp Ass
AWH-048 AWM-089 AWM-091 AWR-106 AWR-107
Power Amp Ass Filter Amp Ass Protection Ass Stabi l izer Ass Power Supply Ass
AWR-108 AWS-094 AWS-095 AWS-098 AWX-062
Power Supply Ass Function Switch Ass Speaker Switch Ass Speaker Switch Ass 5P Connector Ass
AWX-096 AWX-097 AWX-099 AWX-100 AXA-070
Lamp Board Ass Mic Jack Ass Switch Ass (KCU) Switch Ass (S) Tuning Drum A ss
AXA-111 871-004 871-010 M45-086 T22-025
Tuntng Shaft Ass Nut Nut Washer Ferrite Balun
100
-
Parts No. W72-092 2SD555-R 2SB600R
--
Parts Name Bar Antenna Holder Transist or Transistor
SX-'1250
15. SUPPLEMENTS FOR SX-1250/HG AND SX-1250/S For servicing of the SX- 1250/HG or S please refer to pp.4 emphasis selector which are described in this supplement.
15.1
100, with the exception of the power supply section and the de-
CONTRAST OF MISCELLANEOUS-PARTS
FUSES Part No. Symbol
Amp
FU1·4 FU5
FU6
KCU type
HG type
1A
AEK-106
AEK-402
1.5A 1.6A
AEK-104 .. . . ... .
........
12A 6.3A 6A
AEK-301
..... . .. 0
•
••••••
Remarks
S type AEK-106
-
Secondary
---
AEK·104
AEK-405
.. ... ...
Lamp circuits
••
AEK-301
Primary vel tage : 11 OV, 120V Primary vol tage: 220V, 240V Primary voltage: 220V, 240V
0
•••••
AEK-404
. .......
........
AEK-109
SWITCHES Symbol
Part No.
Part Name
Remarks
KCU type
HG type
S type ASK-099
POWER 2-position 4-position with fuse holder
S1
Lever switch
ASK-080
ASK-105
S3
Plug i n selector (Line voltage selector)
........ . . . . . . ..
AKX-037
. .......
. . ..... .
AKR-031
KCU type
HG type
ATT-267
ATT-295
TRANSFORMER Symbol
T3
Part No.
Part Name
Power T ransformer
Remarks S type
-
ATT-291
RESISTOR
R1
Part No.
Part Name
Symbol
Carbon film 2.2M
%W
Remarks
KCU type
HG type
S type
RD%PS 225J
... .....
. .......
CAPACITORS Symbol
KCU type C12
C13
-
Part No.
Part Name
Ceramic Ceramic
0.01 0 .01
150V 250V
Ceramic Ceramic
0.01 0 .01
150V 250V
ACG-003
Remarks
HG type •••
•
•••
S type 0
••
0
0
••••
. . .. . ...
ACG-001
ACG-001
ACG-003
........ .. .. .. ..
. ..... . .
........ •
CQSA511J50
DC1.4kV
DC1.4kV
ACG-001
C15
Polystyrene 510p 50V
•
•
•
•
•
0
0
........
-· C16
Polystyrene 510p 50V
. .. .. . ..
CQSA511J50
C17
Ceramic
........
CCDSL560K50
56p
50V
•••
•
0.
0
0
........
101
P.C. BOARD ASSEMBLIES Part No.
Part Name
Remarks Stype
KCU type
HG type
AWX-099
........
. .......
........
. .......
AWX-101
Power supply assembly
AWR-107
AWR-108
AWR-1 07
Speakers switch assembly
AWS-095
AWS-098
AWS-095
De-emphasis switch assembly
2-position (25s.IS/75).1s) 3-position (25).1s/50).1s/75).1s)
OTHERS Part No.
Part Name KCU type
HG type
s type ADG-015
AC po\11/er cord
ADG-013
AC socket (OUTLET) AC socket (INLET)
AKP-005
........
AKP-005
.. ......
AKP-008
........
ARB-164
ARB-171 ARD-089
. .......
Operating instructions
........
10 2
0
•••
0
•••
Remarks
ARB-168
English German/ French
SX-1250jHG 1 15.3
3
2
4
5
6
SCHEMATIC DIAGRAM FOR SX-1250/HG
POWER SUPPLY .O.SS'y .O.WR ·106
r · -·- · - · - · - · - · -·-,
d
A
--1?.>-----,9-!_ f 30••
FM AM TUNER ASS')"
0, 2SC8U
• 2SD313P
• uv
PAOTECTIO" .o.ss•y .O.WM
'i
•0!1 )12
A
AWE · 06e
r ·- - - - - - - - - · - - -· - · - · - · - · - · - · - · - ·
! ,,....
I
• I
:~1
·---B
B
Lch
c
l
c
r~-·
RchlP..O.O
1
.,, SWITCHES, S, POWEA S, RELAT S, M.iO..T.IGf SfLECll.lll!l.Zllll i1ll401
$,
s. So S,. S,.
S• S, So
S• S• S, Su Sn S,.
D
S~
s. Sn
S,.
1 105
~M
FM ~ONO I
f'HONO 2/MIC AUX TAP( roNITOR I TAPE ~NITOR 2 TAPE DUPLICATE AOAPTOR MODE MUTING LOUDNESS TONE LOW FILHR HIGH FILTER SPEA,ER A SPEAI<EA B SPEAKER C
~ -ON
OFF-Q!:!
S,,
s. S,,
FM MUTING FM MULTIPATH REED RELAY
511
RELA'1
OFF -.Q!i QEt- ON
1
lch
ill - ON i l l - ON 2Ef.- ON Qft
ON
Q!l.- ON OFF- ON ON
.Qff:-
ill.!!.tQ- MONO Q!l.- ·2Qd6
2Et.-
ON
RESISTOR , IN 0HM,I/4W TOLERANCE UNLfS5 OTHERWISE NOTED K •ll H Hll
J
'5''
CAPACITORS, N..,F UNLESS
OTHERWISE NOTED P pF
c::::YJ <>
SIG~AL VOLTAGE AT SPEMER Ou'PuT DC CURRENT 0C VOLTAGE
J6V18ll '-"'
A I NO INPL T S•GNAL AT NO .NPUT SIG NAL
D
~-ON
QfrOFF -
J0H1 8kHt
E- ON
.QEE- ON OFF- ON
2
3
4
5
6
SX-1250/S 1 15.2
2
4
3
5
6
SCHEMATIC DIAGRAM FOR SX-1250/S
PROTECTION ASS'y AWM - 0,1 Y2
A
A flJ, llA 1110,1!0Vl 6Ail20, 744Vl
B
B
FM OE- EMPHASIS SWITCH Ass'y AWX - 101
I
~
~ ~--------~
PlfDHOl
r::JEJ
c
"[ ~~~
c
"' f
Pt1QNO ~
Rcn
l
""OhQ I
'"' SWITCMES; POWER RELAY fUst HOlDER
s, s, s, s, s. So
s. s,,
s, s, s,, s, Sm s., s. s" s.
D
s~
s. s, s.
1
A~
·~
?MONO 1 P>
LOUDNESS TONE .Ow FiLTER HIGH FILTER SPEAKER A SPEAKER B SPEAKER C
S,,
OFF- ON
-
s,.
lHOV 1.1'20V~?!0'<4.1oi0Vs,, Qf£. -ON S. OFF-Q!:! S" Qll- ON
!="'' MUTING Fl'\ MULTIPATH REED RElAY RELAY FM DE- EMPHASIS
OFF -.Qli
!!fr
1~,..s
-ON
i
m-o·
OFF- ON ON Qf£.-ON
Qtt-
MONO
.Qfr-·20dB
Qtt.-
'o,
o•
CAPACITORS. \_.F J'LESS
s.A ' C})
ON
ill.!lli!-
fi -®: :®-
RESISTOR ; IN 0HM.1/4W >5'' TCL~RANCE U"'ESS OTHERw·SE NOTED K •ll M Mll
OFF- ON
QEI-
CTHERW SE NOTED P
:1
·-:---·--
POWfR AMP ASl'y
~...:...__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _J __ _ _ _ _ _ _ _ _ _~-~---r · -----~
- so,.s - '!hl
p<
=C>
SIGNAL VOLTAGE AT SPEAo\(R :.TPuT DC CURRENT AT NO INPc T SIGNAL VOLTAGE AT NO INPUT SIGNAL
l8V/8 Q. 'kH L
or
QE.t... -ON
2Ef. -lOHi OFF-8kH a
~ -ON .Qtt.- ON
,~
.
.~
~
r 1
LJ ® '·
,
AWH-048
~
®,, ~
·L
i ~ _:?,·· '• iL_ ___ ____~ : ·.=..:_ _______ ' ~--j
D
()FF- ON
2
3
4
5
6 104
SX-1250/S 15.4
DE-EMPHASIS SWITCH ASSEMBLY (AWX-101, for S type)
,-
3
2
I
I
4
-, CL 0 0
CL 0 0
0J
0J
I
Cs 56P •
C,ISOP
I I I
L _________ j C6 56P
C1l'lDOP
o-tt-o
I
Si c~ 150P
0--fJ--0
C4 510P
o-U--o 0
0
0
0
1
o-u--o
:
Cz1200P
o-u--o
00
AWE-068, No.4
2 00
i
g Cs 5tOP
I
o-f 1-<>
AWE-068, No.1
3
00
AWE -068, No.5
4
00
AWE-068, No.2
Parts List of De-emphasis Switch Assembly (AWX-101, for S type) Symbol
Description
Part No.
S1
Slide switch (DE-EMPHASIS)
ASH -017
C1 C2 C3 C4 C5 C6
Ceramic Ceramic Ceramic Polystyrene Polystyrene Ceramic
CKDYA 122J 50 CKDY A 122J 50 CCDS L 151 K 50 CQSA 5 11J 50 CQSA 511J 50 CC DS L 560K 50
1200p 1200p 150p 510p 5 10p 56p
50V 50V 50V 50V 50V 50V
107
15.5
SPEAKERS SWITCH ASSEMBLY (AWS-098, for HG type)
ON
t
- x- --=e---x--, OFF
1'1
~
13
15 SP B
16 SP C
~
<:')
~
C!
0]
0
14 SPA
0
If)
Li)
a::"'
r2
I
L_ _ _ _
5 4
Parts List of Speaker Switch Assembly (AWS-098, for HG type) Symbol
Description
S1
Push switch {SPEAKERS!
R1 R2
Metal oxide resistor 150 Metal oxide resistor 150 Phone jack {PHONESI
108
Part No. ASG-100 3W 3W
RS3P 151 K RS3P151K AKN·010
2
3
SX-1250/ HG
I
1
I
2
3
A
A
. ..
.
AWM -091, No .8
-
::> 1 ~
0
~
0
.i...i
0
i...i
0
~
0 ~
0
~
0
~
0
62 SP. C
8
.
~
0
~
0
&...i
0
~
o -~
0
~
0
0
~
0
~
0
SP. B
&...i
0
ti...i
0
~
0
~
0
~
0
~
0
~
0
SPA
-
6
4
.O L O-
b b 6 b
5
RO
B
f'I R O-
c
8
~.
6
7 AWM -091, No .7
8
...
rAWS-094, No.1 AWR-106, No.8
<j>10
9 11 0 12
-
R· 150 l 3W,
<j>13
c R2
~ -
R O-
3
69
~
A
'"' L O
6
0
0
'"' L 0-
150 C3Wl
PHONES JACK
,r,
014
~PL
( VPL7 t
J~-
PL 5
6
c
915 016
.
0 17
7
D
D
1
I
2
I
3 109
15.6
POWER SUPPLY ASSEMBLY (AWR-108, for HG type)
~-------------,
.!
i I
. I
4t I
C.,O.OI/150
+~J~ SIBOI -ol•2
I
lr)
r" "'
..
0
~
+
~
u
6
"' c) ~
<:]
Parts List of Power Supply Assembly (AWR-1 08, for HG type) SEMICONDUCTORS Symbol
Description
Part No.
Dl D2 D3 D4
Diode Diode Diode Diode
SIBOl -04 SIBOl-04 SIBOl-04 SIBOl-04
D5
Diode
D6
Diode
SIBOl-01 (IS1885) SIB01·01 ( IS1885)
RESISTORS Symbol Rl R2 R3 R4
110
Description Wire wound Metal oxide Metal oxide Metal oxide
3.3 2.2k 10 10
Part No. 20W 2W 2W 2W
I
ACN·003 RS2P 222J RS2P lOOK RS2P lOOK
CAPACITORS Symbol
Description
Part No.
C1-C4 C5 C6 C7 C8
Ceramic Ceramic Electrolytic Electrolytic Electrolytic
0.01 0.01 470 470 470
250V 150V 100V 100V 25V
ACG-001 ACG-004 CEB 471P 100 CEB 471P 100 CEA 471P 25
C9 C10
Electrolytic Ceramic
470 0.01
25V 150V
CEA471P25 ACG-004
OTHERS Symbol
Description Micro temp Fuse clip
Part No. AEX-005 AKR-010
SX-1250/HG
.---+--o13 012
t t R> Z 2 K/~W
D1 ~ 04
SIBOI 01 <4
~~ -
0.01/250
C•
,4
ea
+
470/25
c. 0.01/ 150 <>-!!---<> 0
us S1BOI1ll 14 0
Ftl4 lA
~A
FU3 IA
CsQOI/100
<>-!!---<>
R1 33
L[
FU~
1.6A
C10WJ
• C9 <>-J;t-o 410/2~
10
9
8
7
011
6
5
AWR-106, No.7 AWR-106, No.6 '----~ AWR - 106,
No.15
GRN AC INLET
BRN GRN
cl2
220V 240V 50/ 60H
0.01 OR BLU BLU AWX -096, No.1
WHT
s.
AWM -091, No.2
D
111
s
-1250 < ART-158-0>
- ·'-
'
Q.,, PIONEER®
SX-1250
4. CIRCUIT DESCRIPTIONS 4.1 TUNER SECTION FM Front End The FM front end is composed of a tuning circuit employing a 5-gang variable capacitor, a 2-stage RF amplifier and mixer employing dual gate MOS FETs, and a local oscillator with buffer. An equivalent of a cascode amplifier is produced by AC grounding gate-2 of the dual gate MOS FET, allowing stable RF amplification at high gain. The output signal of the RF amplifier is applied to gate-1 of the mixer stage MOS FET, while the local oscillator output signal is applied to gate-2. This technique minimizes input power from the local oscillator, resulting in low mutual interference even if the received signal input level is high. A variation of a Clapp circuit forms the local oscillator. Inclusion of a buffer amplifier between local oscillator and mixer reduces local oscillator load, eliminating distortion of the oscillation waveform. Drawing effect of the local oscillator is also eliminated.
FM IF Section Four integrated circuits (ICs) and four dual element ceramic filters compose this section. HA1201 (diagram on page 56) is a differential amplifier with a constant current source and functions as a current-limiting limiter. HA1137 (diagram .on page 55) contains IF limiter amplifier, quadrature detector, meter drive and muting circuits. The detector circuit contained within this IC is not used in the SX-1250 however, and instead the IF signal is taken from the stage prior to the detector and applied to TA7061AP. This latter IC is a 3-stage differential amplifier (diagram on page 56) and its output goes to the ratio detector for FM detection.
2nd RF amp
'-¢-+-+-Juarr~
r
FM 300 Q BAL. L
Mixer
Fig. 1. Circuitry of FM front end
IF il
- -o-- _.,
15
1--- -- - - - - - - - - - - - - - - - -- --
Fig. 2.
-o-SIGNAL meter
Block diagram for HA 1137
J
11
MODEL SX-1250 COMES IN THREE VERSIONS DISTINGUISHED AS FOLLOWS: Voltage
Type
Remarks
KCU
120V o n ly
CSA (Canada) and UL (U.S.A) approved with de-emphasis selector switch (25~ots/ 75J.'S)
HG
220V and 240V (Switchable)
SEMKO (Sweden), NEMKO (Norway), DEMKO (Denmark) and El (Finland) approved
11 OV, 120V. 220V and 24 0V (Switchable)
General export model with de-emphasis selector switch ( 25~ots / 501's/ 751's)
s
I•
When repairing S or HG type, please see the manual on page 101 .
CONTENTS 1.
SPEC! FICATIONS
4
2.
FRONT FACILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6. 4
3.
CONNECTION DIAGRAM
9
4.
CIRCUIT DESCRIPTIONS 4.1
Tuner Section
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2
Audio Section
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3
Protection "Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4
Power Supply Circuit
5.
LEVEL DIAGRAM
6.
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.
DISASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.
PARTS LOCATION
9.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.1
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.2
Rear View
8.3
Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.4
Bottom Vrew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.5
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
ADJUSTMENTS 9. 1
AM Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~-
9.2
FM Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.3
Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9.4
Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 38
. . . . . . . . . . . . . 36
10.
DIAL CORD STRINGING
11 .
EXPLODED VIEWS ....................... .... ................. .. ... .. . 40
12.
SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTS 12.1
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Miscellaneous-parts
.. .. ....... ... ............ ...... ... . .... ..... . 39
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
SX-1250
12.2
Schematic Diagram
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.3
Internal Circuitry of Integrated Circuits
12.4
The Circuit of FM Front End (AWB-023) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
12.5
Tuner Assembly (AWE-068) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
12.6
De-emphasis Switch Assembly (AWX-099) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
12.7
Equalizer Amplifier Assembly (AWF-021) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
12.8
Function Switch Assembly (AWS-094) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
12.9
Flat Amplifier Assembly (AWG-042)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
12.10 5P Connector Assembly (AWX-062) . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . 75 12.11 Control Amplifier Assembly (AWG-041)
................................ 76
12.12 Filter Amplifier Assembly (AWM-089) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 12.13 Microphone Jack Assembly (AWX-097) . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . 83 12.14 Power Amplifier Assembly (AWH-048) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 12.15 Speakers Switch Assembly (AWS-095) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 12.16 Protection Circuit Assembly (AWM-091) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 12.17 Stabilizer Assembly (AWR-106) ....................................... 93 12.18 PowerSupplyAssembly(AWR-107) ......................... .. ......... 96 13.
PACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
14.
PARTS LIST OF EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
15.
SUPPLEMENTS FOR SX-1250/HG AND SX-1250/S
-
15.1
Contrast of Miscellaneous-parts ........ ... ........ . .................... 101
15.2
Schematic Diagram for SX-1250/S ........ . ............... . .. . .. . . . .. . . 103
15.3
Schematic Diagram for SX-1250/HG .... .. . . ...... ........ .. . . .. ... . .... 105
15.4
De-emphasis Switch Assembly (AWX-101, for S type) ...................... 107
15.5
Speakers ~wttch Assembly (AWS~098, for HG type) . ................ . ...... 108
15.6
Power Supply Assembly (AWR-108, for HG type) ......................... 110
3
1. SPECIFICATIONS Semiconductors FETs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 6 82 60
Power Amplifier Section Continuous Power Output from 20 Hertz to 20,000 Hertz (Both channels driven).. 160 watts per channel (8 ohms) 200 watts per channel (4 ohms) Total Harmonic Distortion (20 Hertz to 20,000 Hertz, from AUX) Continuous Rated Power Output. .. No more than 0.1% 80 watts per channel power output, 8 ohms . . . . . . . . . . . No more th an 0.05% 1 watt per channel power output, 8 ohms . . . . . . . . . . . No more th an 0.07% lntermodu lation Distortion (50 Hertz: 7,000 Hertz= 4: 1, from AUX) Continuous Rated Power Output... No more th an 0.1% 80 watts per channel power output, 8 ohms . . . . . . . . . . . No more than 0.05% 1 watt per channel power output, 8 ohms . . . . . . . . . . . No more than 0.07% Frequency Response . . . . . . . . . 5Hz to 100,000 Hz ~?d B Input Sensitivity/I mpedance POWER AMP IN . . . . . . . . . . . . . . . . 1 V/50k ohms Ou t pu t Speaker . . . . . . . . . . . . . . . . A, B, C, A+B, B+C, A+C Headphone . . . . . . . . . . . . . . . . . . . Low Impedance Damping Factor (20Hz to 20,000HL, 8 ohms) ...... . . . . . . . . . . 30 Hum and Noise (IHF , short-circuited, A Net wor k) .. 100dB
Preamplifier Section Input Sensitivity/ Impedance PHONO 1 . . . . . . . . . . . . . . . . . . 2.5mV/50k ohms PHONO 2 . . . . . . . . . . . . . . . . . . 2.5mY/50k ohms MI C . . . . . . . . . . . . . . . ....... 6.5mV/50k ohms AUX . . . . . . . . . . . . . . . . . . . . . . 150mV/50k ohms TAPE PLAY 1 ... ........ .... 150mV/50k ohms TAPE PLAY 2 . . . . . . . . . . . . . . . 150mV/50k ohms TAPE PLAY 2 (DI N connector) .... 150mY/50k ohms PHONO Overload Level (T.H.D. 0.1%) PHONO 1 . . . . . . . . . . . . . . . . . . . 500mV (1k Hz) PHONO 2 . . . . . . . . . . . . . . . . . . . SOOmV (1kHz) Output Level / Impedance TAPE REC 1 . . . . . . . . . . . . . . . . . . . . . . . 150mY TAPE REC 2 ...... .. . . . . . . . . . . . . . . . 150mV TAPE REC 2 (DIN connector) .... 30mV/80 k ohms
4
PRE OU T I V/ 1k ohm~ I OtJ I Ht~ rmonic Distortion (20Ht o t 20,000H7, 1 V ou t put) .. No more than 0.02% Frcquency Response PIIONO (R IAA equal i;ation) . .30H; to 15,000Ht ± 0.2dB AUX, TAPE PLAY . .. . . . . . I OHz to 50,0001lt •?d B Tone Control BASS . . . . . . . . . . . . . . . . . MA IN ±10dB ( I OOilz) SUB ± 5dB ( SOH1) TREBLE . . . . . . . . . . . . . . . MA IN ± I Od B (IOkllz) SUB ± Sd B (20k Hz) Filter LOW . . . . . . . . . . . . . . . . . . .... 30Hz ( 12dB/oct.) HIGH . . . . . . . . . . . . . . . . . . . . . 8kH1 (12dB/oct.) Loudness Contour (Volume control set at 40dB position) ..... +-6dB (1 OOHL). +3dB ( I OkH;) Hum and Noise (IHF , short-circu ited, A Network, rated power) PHONO . ....... . . . . . . . . . . . .... . .... 75dB AUX, TAPE PLA Y . . . . . . . . . . . ... ...... 90dB Muting . . . . . . . . . . . . . . . . . . . . . .. ...... - 20d8
FM Section Usable Sensiti vity ... MONO ... 8.7dBf (3.0pV/300Q) STE REO. . 14.5d Bf (5 .SpY /300Q) Usable Sensitivity (I HF '58)... . . . . . . . . . . . . . 1.5pV SOdB Quieting Sensitivity ... . MONO ... 11.5dBf(4.1pV/300Q) STEREO. . 36.0dBf (69pV/ 300U) Signal-to-Noise Ratio at65dBf .. MONO ....... 80dB STEREO . . . . . 74d B Di stortion at 65dBf 1OOHL ..... MONO. . . . . . . 0.1 % STEREO . .... 0.25% 1kHz ...... MONO. . . . . . . 0. 1% STEREO . . . . . 0.2% 6kHt ...... MONO. . . . . . . 0.3% STEREO . .... 0.3% Frequency Response ........ 30Ht to 15,000HL +?:~dB Cap ture Ratio ... . . . . . . . . . . . . . . . . . . . . . . . l.OdB Alternate Channel Selectivity ....... . ........ 83dB Spurious Response Ratio . . . . . . . . . . . .. . .... 11 Od B Image Response Ratio . . . . . . . . . : . . . . . . . . . . 110dB IF Response Ratio . . ..... . . . . . . . . . . . . . . . 120dB AM Suppression Ratio . . . . . . . . . . . . . . . . . . . . 60dB Muting Threshold . . . . . . . . . . . . . 13dBf (4.9tN/300Q) Stereo Separation . . 50dB (1k Hz), 35 dB (30Hz -15kHz) Subcarrier Product Ratio . . . . . . . . . . ........ 74dB SCA Rejection Ratio . . . . . . . . . . . . . ... . . ... 74dB Antenna Input . . . . . . . . . . . . . . . . 300 ohms ba lanced 7 5 ohm~ u nbalanccd
SX-1250
AM Sec tion (IHI , f errite antenna) .. . ....... 300JJ.V/m (IH r, [xt. antenna) . . . . . . . . . . . . . . 15JJ.V Selectivity .... .... ....... . . .. . . ....... 40d8 Signa l-to-Noise Rati o ....... .. . . . . . . . . . . . . 55d8 l mc~ge Response Ratio .. . .. . .. . ........... 65d8 Ir Respo nse Ratio . . . . . . . . . . . . . . . . . . . . . . . 85d 8 Antenna ........... Built-in Ferrite Loo pst ick Antenna Sen~iti vity
Miscellaneous Powe1 Requ irements . . . . . . . . . . . . . . . . . 120V 60Hz Powe1 Consumption . . . ............ 650W (UL, CSA) 1200W (max.) Dimensions . . ... . .. 556(W) x 186.5(H) x 464.5(0) mm 21-7/8(W) x 7-3/8(H) x 18-1/4(0) in Weight Without Package .......... . 29.2kg (64 lb 4 oz) With Package ......... . . . .. 33.2 kg (73 lb 1 oz) Furnished Parts rM T-type Antennc~ Opel at ing Instruct ions . . . . . . . . . . . . . . . . . ..... . Hex. Wrench .......... . ....... . . . . . . . . . . . . NOTE:
Specifications and the design subject to possible modification without notice due to improue men ts.
HEX WRENCH The accessory Hex. wrench is provided for removing the VOLUME and TUNING knobs, or for tightening its setscrew in the event it becomes loose. If required, loosen the setscrew by inserting the wrench into the hole on the side of the knob and turning t he wrench counterclockwise. Be particularly careful not to scratch t he front when emp loying t he wrench.
5
2. FRONT FACILITIES FUNCTION SELECTOR BUTTONS To select the program source, push each button as fol lows: NOTE: Only one FUNCTION button should be depressed at a time.
PHONO 1
To operate a turntable connected to the PHONO 1 input jacks.
AUX
For listening to audio component (cartridge tape player, TV sound tuner, etc.) connected to the AUX input jacks.
AM ......... For AM broadcast reception.
AM
FM
PHON01
PHON02 / MIC
AU)(
L-
FM
For FM stereo reception. Automatically receives monophonically during FM monophonic broadcasts. The STI: RLO indicator li ght ~ Ufl when the br oJclcJ~t i~ in stereo.
TAPE DUPLICATE SWITCH Set this switch in the ON (down} pos1t1on to duplicate or edit a recorded tape using two tape decks.
PHONO 2/MIC. As above for PHONO 2 jacks, or for reproduction through microphones connected to the MIC iack is on the front . Note, when the microphone is connected to the jack the turntable connected to the PHON02 jacks cannot be used.
r TAPE -----, OUPl.IC ATE M O NITOR 1
AOAPTO~
2
0~ 09 0~ 0~ J
TAPE MONITOR (1, 2) SWITCHES Set these switch in the ON (down} position as fol low: 1 . . . . With a tape deck connected to the T API::. jacks (REC and PLAY), either playback or monitoring of a recording in progress are possible. 2 . . . . Same as in 1 above, with a tape deck connected to the TAPE 2 jacks (REC and PLAY) .
ADAPTOR SWITCH When employing adaptor components, such as a graphic equalizer adaptor, RG processor, or Dolby N R adaptor, depress this ADAPTOR switch to ON.
For normal use, leave in the OFF (up) positions.
VOLUME CONTROL AND AUDIO MUTING
SWITCH The extremely high P,Ower output of the SX-1250 can be finely controlled by combining the calibrated VOLUME control and the AUDIO MUTING switch. The AUDIO MUTING switch can also be used to briefly lower the volume when changing records or tapes.
6
22
2
18
34·18, ~ ~,·'''•/~
110
40 ~~ 48 -
~·
~
MUTING
B B
54 •
62
.
70 ~
0 -dB
VOLUME
'
2
~ .
' 4 - 20d8
•
SX-1250
SPEAKER BUTTONS Three sets of speaker terminals, A, B, and C, are provided on the rear , and the required speaker systems can be se lected by depressing the SPEAKERS buttons as follows: A ........... Speaker systems A operate B . . . . . . . . . . . Speaker systems B operate C ... ·: . . . . . . . Speaker systems C operate NOTES: 1. When any two buttons (A+B, B+C, C+A) are depressed simultaneously, the corresponding pairs of speaker systems will come into operation. Howeuer, it is not possible to operate all three speaker systems at the same lime, euen though all the bu tlons are depressed. 2. For priuate listening through headphones, return all the SPEAKERS buttons to the OFF (undepressed) position.
FM TUNING METER With the SIGNAL meter needle deflected to the right, make fine adju stment by centering the FM TUNING meter needle (indicating optimum reception).
FM MUTING BUTTON Leave this button undepressed (in the ON position) to suppress unpleasant interstation noise while tuning between FM stations. Low-strength signa ls may also be suppressed by this function, so to pick up a weak station depress this button to the OFF position.
SIGNAL METER For AM and FM station tunings. AM tuning: Tune for maximum deflection of the SIGNAL meter needle to the right. FM tuning: Both the SIGNAL and FM TUNING meters wo rk together. The optimum point of the SIGNAL meter needle is the same as in AM tuning. Then use the FM TUN ING meters.
PROGRAM SOURCE INDICATOR
SPEAKER SYSTEM INDICATOR FM STEREO INDICATOR
l
PHONES JACK Accepts stereo headphones.
TUNING KNOB Select the station and tune for optimum reception by observing the SIGNAL meter for AM stations, and both SIGNAL and TUN lNG meters for FM stations.
1
r
r
I
,
rr r
MIC JACKS (L and R) For connect each channel jacks the left and right channel microphones.
0
U
•o
10
U
9C>
Ill
10
Ill
111
.J(. IU
I ~(
•0
NOTE: Use the high impedance (aboue 20kn.) with 6mm diam. phone plugs.
1
- - - --. -,-qz_,t_9.!::4=I~"~II?EI ---~1---:~;:--------,-,al,-,-.~ ..!~,9=6=,=98=-,=I=OO=,=I=OZ=I: :!.l.g_-14-,-I0-6-,-,\,2-;8-,-------~~ . AM
,/
,~
,. 1Qkl-ll
WARNING: Do not plug a microphone into the PHONES jack as may damage the microphone.
POWER SWITCH After turning this switch ON there is a delay of some 6 to 8 seconds, during which time the protection circuit operates to eliminate unpleasant noise. TWIN BASS CONTROLS Adjust low frequency tone. 100Hz: Adjusts frequency band below 400Hz. Control effectiveness at 100Hz is ±10dB. 50Hz: Provides additional co ntrol for the frequency band below 200Hz. Control effectiveness at 50Hz is ±5dB.
TONE SWITCH In the OFF {up) position, this switch causes the amplifier section to operate with a flat frequency respo nse regardless of the tone control setting.
JlU~ HIGH CUT (8kHz) FILTER BUTTON When high frequency scratch noise (from worn records or other source) is unpleasant, depress this button to provide 12dB/octave attenuation at frequencies above 8kHz. If there is no interference, release this button.
I
VOLUME CONTROL Adjusts output level to speakers and headphones. Scale is graduated in dB, and when used in conjunction with the MUTING switch, finer and wider range attenuation can be performed. See additional description on page 6. AUDIO MUTING SWITCH - 20dB Depress this switch to attenuate the aud io output by 20dB. This conven ient feature saves having to disturb the VOLUME control, for example when answering the telephone.
- ... +
LOW CUT (30Hz) FILTER BUTTON When low-pitched rumble (from turntable motor or other source) is obstrusive depress this button to provide 12dB/octave, attenuation at frequencies below 30Hz. If no interference is experienced, release this button.
)
FM MULTIPATH BUTTON When selecting the best position for the FM antenna, depress this button so that multi path noise is heard from the speaker systems. To listen to FM broadcasts, release this button. TWIN TREBLE CONTROLS Adjusts high frequency tone. 10kHz: Adjusts frequency band above 2.5kHz. Control effectiveness at 10kHz is +lOdB. 20kH7: Provides additional control for the frequency band above 5kHz. Control effectiveness at 20kHz is +5dB.
LOUDNESS SWITCH Depress this switch when listening at low volume. The frequency .response of the human ear varies according to the listening volume, and the depressed position compensates for hearing response by emphasizing the bass and treble. MODE SWITCH For stereo playback, leave this switch undepressed (or depress to release, if already depressed). When depressed for MONO playback, left and right channel stereo signals will be mixed to produce monophonic sound from both speaker systems. BALANCE CO NTROL Adjusts the balance between the sound vol ume from the left and right speaker systems or headphones.
B
3. CONNECTION DIAGRAM TURNTABLE
TAPE DECK (open-reel , cassette)
TURNTABLE
TAPE DECK (Open-reel, cassette)
DOLBY NR ADAPTOR
--
-
4 CH A NN EL DISCRETE FM ADAPTOR
~
:.)o D EJ 0
LINE "INPUT
LINE OUTPUT
LINE INPUT
OUTDOOR FM ANTENNA
LINE OUTPUT
LINE IN PUT
LINE OUTPUT
PRE/POWER AMP The brrdge connectrng plugs between PRE OUT and POWER IN jacks shou ld always be left rn posrtron rn normal use. I I they are diSConnected or removed, no sound wrll come fro m the speakers. Always be sure to switch off the power supply before attempting to remove them .
T -TYPE FM ANTENNA c~UIION
~J ~JI
Rt MOH
I~'
ll..>llll SCJ ..... MA:>e
CONVENIENCE OUTLETS Unswitched: Less frequently used components, which do (200W max.) not requ ire coupled power, can be p lugged into either of these outlets.
""'*S""tTt:,..£0
SV'~
300!1 feeder
Sll 801 10M NOI Ct
IO,.,L~W ..... oAll.
Switched: (SOW m ax.)
AM ANTE NNA (Indoor or Outdoor)
GND
"j
'
!"
, r-..
:
;;.
FM DE-EMPHASIS SWITCH Normally, set this swi tch to "75JJs" . Be sure to set it to "25~ts" only when listening to an FM broadcast (pre· emphasis; 25~tsec . ) w i th a Dolby • system NR adaptor con· nected between the ADAPTOR OUT and ADAPTOR IN terminals.
*
8
I he word "Dolby" is a trademark of Dolby Laboratories I nc.
;,I
~r
..t
IL
I
' II
'·· R IGHT
LEFT
SPEAKER SYSTEMS A
RIGHT
"
fi
f;
"iL, !(
i
~
~
' LEFT
SPEAKER SYSTEMS B
RIGHT
LEFT
SPEAKER SYSTEMS C
A frequ en tly used component (turntable, tape deck, etc.) can be plugged into this outlet. By leaving the power switch of that component in the ON position, power supply to the component will be coupled w ith the SX-1250 swi tch operation.
SX-1250
4. CIRCUIT DESCRIPTIONS 4.1 TUNER SECTION FM Front End The FM front end is composed of a tuning circuit employing a 5-gang variable capacitor, a 2-stage RF amplifier and mixer employing dual gate MOS FETs, and a local oscillator with buffer. An equivalent of a cascode amplifier is produced by AC grounding gate-2 of the dual gate MOS FET, allowing stable RF amplification at high gain. The output signal of the RF amplifier is applied to gate-1 of the mixer stage MOS FET, while the local oscillator output signal is applied to gate-2. This technique minimizes input power from the local oscillator, resulting in low mutual interference even if the received signal input level is high. A variation of a Clapp circuit forms the local oscillator. Inclusion of a buffer amplifier between local oscillator and mixer reduces local oscillator load, eliminating distortion of the oscillation waveform. Drawing effect of the local oscillator is also eliminated.
FM IF Section Four integrated circuits (ICs) and four dual element ceramic filters compose this section. HA1201 (diagram on page 56) is a differential amplifier with a constant current source and functions as a current-limiting limiter. HA1137 (diagram on page 55) contains IF limiter amplifier, quadrature detector, meter drive and muting circuits. The detector circuit contained within this IC is not used in the SX-1250 however, and instead the IF signal is taken from the stage prior to the detector and applied to TA7061AP. This latter IC is a 3-stage differential amplifier (diagram on page 56) and its output goes to the ratio detector for FM detection.
2nd RF amp
~OOfrr~
r
FM 300 Q BAL. L
Miur
Fig. 1. Circuitry of FM front end
IF i1
~-o---l
15
Fig. 2.
Block diagram for HA 1137
J
11
Multiplex Decoder The multiplex decoder contains three sections and employs an IC (HA1196) with a block diagram as shown in Fig. 3 (see page 55 for circuit). 1. Switching Signal Generator A PLL {phase locked loop) system is employed. 76kHz is generated by the VCO (voltage controlled oscillator: an oscillator in which frequency is controlled by a voltage) and converted into 38kHz by a frequency divider, then divided again to become 19kHz. This signal and the stereo pilot component (19kHz) of the detected signal are applied to a phase comparator where the difference between them is converted into a voltage. By this voltage is applied to the VCO. And the oscillator sigl)al is locked to the pilot signal. This loop is termed PLL and a 38kHz switching signal synchronized to the pilot signal is obtained and employed as a switching signal.
2. Automatic stereo detector With the PLL locked to the pilot signal, the pilot signal and a 19kHz signal of the same phase are produced. A voltage is then obtained at the phase comparator that is proportional to the pilot signal amplitude. As it increases, the lamp lights and the switch becomes on. The switching signal is applied to the demodulator.
Composite SifUI
-¢-
However, if the FM muting signal is also applied to pin 12, the detector circuit becomes disabled (grounded). Therefore a switching signal to the demodulator is not supplied and mono reproduction is obtained. 3. Demodulator Two differential amplifiers are employed in a switching circuit (Fig. 4). The composite signal is applied to the base of Q3. Q1 and Q2 are alternately switched ON and OFF by the switching signal. The composite signal amplified at Q3 is demodulated by the switching of Q1 and Q2. Q6 and Q3 are loosely coupled at their emitters by R1, R2 and R3. Q6 is driven in opposite phase to Q3 and its low level composite signal output is demodulated by switching of Q4 and Q5. The demodulated signals in opposite phase are combined at the collectors of Q1 and Q2, cancelling crosstalk. Adequate current flow is required in Q3 and Q6 for low distortion. However, if the base bias voltage is raised, the voltage range available at the collector is reduced and clipping occurs (power supply voltage is limited by IC voltage requirement). For this reason, current from an external source is inserted at Q3 and Q6 collectors and become I1 and 12 in Fig. 4. The same amount of current is removed at the emitters of Q3 and Q6 to become 13 and 14 in Fig. 4. Q3 and Q6 therefore operate with adequate current and distortion in this stage is remarkably reduced. A amplifier amplifies the demodulated signal to produce the IC outputs.
+l
I
_ _ _ _j Lch
o•tprt
Sepa. adj.
STEREO
Rch
output Fig. 3. Block diagram for HA 1196
12
indicator
SX-1250 Multipath Monitor Circuit
When multipath reflections exist in the received signal, the signal is converted into AM and PM (amplitude modulation and phase modulation) forms. Since the amplitude of the actual FM signal is fixed, by converting this AM component into a sound and listening to it, the existence (and amount) of multipath reflection can be determined. Short term level variations (audio frequency) are taken as a signal from HA1137 SIGNAL meter drive terminal (pin 13). By setting the FM MULTIPATH switch to ON during FM reception, this signal becomes connected to the audio amplifier and can be heard as a sound which indicates conditions of multipath reflection.
+ Vee
Fig. 4. Basic circuitry of demodulator
FM Muting Circuit (Fig. 5) DC voltage emerges from pin 12 of IC (HA1137) in the event of more than ±70kHz detuning or low input level (less than' 4. 9J..L V antenna input conversion). This is employed for shorting the AF output circuit to perform muting by the reed relay.
AM Tuner The AM tuner employs a 3-gang variable capacitor and an IC (HA1138) with 1-stage of RF and 2-stage of IF amplification. Fig. 6 shows the HA1138 block diagram (see page 55 for circuit).
Af output circuit HA1137
Schmitd circuit
-!-Jr I
Reed + Vee, relay
I Fig. 5. Circuitry of FM muting
10
Af outpwt
:. .___ ___________ ------- ___/
SIGNAL meter
Fig. 6. Block diagram for HA 1138
13
4.2 AUDIO SECTION Equalizer Amplifier The equalizer amplifier is shown in Fig. 7. The first stage (Ql & Q2) is a PNP transistor unbalanced differential amplifier. High voltage gain is provided in the following stage (Q3) by a bootstrap circuit (Cl & Rl). The output stage (Q4 & Q5) is a complementary symmetrical SEPP circuit. The high voltage utility factor of the SEPP circuit provides a high maximum output voltage. Dynamic range of the equalizer amplifier is therefore wide and overload input level at 0.1% distortion is 500mV (rms at 1kHz). Equalizer elements (C2, C3, R2, R3) are polystyrene film capacitors with tolerances within ±1% and metal film resistors with tolerances better than ±1%. These lead to a deviation with respect to the RIAA playback standard within ±0.2dB. Due to the balanced plus and minus power supply, the input and the output points become essentially OV, reducing click noise during FUNCTION switch operation.
The TAPE MONITOR 1 switch selects between the program source selected by the function switch and the input at the TAPE. 1 PLAY jacks (Fig. 9). The TAPE MONITOR 2 switch selects between the signal selected by the TAPE MONITOR 1 switch and the input at the TAPE 2 PLAY jacks (Fig. 9). TAPE 1 PLAY
TAPE 2 PLAY
J
FunctiDII switch
011! TAP£ IIIOIIITOR 2 switch
TAPE MONITOR 1 switch
Fig. 9. Tape monitor circuit
When the DUPLICATE switch is set to ON, the TAPE 1 REC jacks are connected to the TAPE 2 PLAY jacks, and the TAPE 2 REC jacks to the TAPE 1 PLAY jacks (Fig. 10). TAPE 1 REC PLAY
@
@
TAPE 2 REC PLAY
@
@
+ Vee ------ DUPLICATE switch
Output H~--+-+--+-.--tt--0
Vee Fig. 7. Schematic diagram for Equalizer amplifier
Fig. 10. Tape duplicate circuit
The signal selected by the TAPE MONITOR 2 switch appears at the ADAPTOR OUT jacks (Fig. 11). The ADAPTOR switch selects between the signal selected by the TAPE MONITOR 2 switch and the input at the ADAPTOR IN jacks (Fig. 11). ADAPTOR
Tape and Adaptor Circuits With the DUPLICATE switch OFF, the program source selected by the function switches are obtained at the TAPE REC jacks (Fig. 8). TAPE 1 REC
@
Function
TAPE 2 REC
@ --- DUPLICATE switch
o--.______...___
switch
Fig. 8. TAPE REC jacks
14
OUT
@
TAPE IIIOIIITOR 2
switch
IN
1
o-----_j----A-'DA!1'PT~OR>--switch
Fig. 11 . ADAPTOR jacks
MODE Switch When the MODE switch is set to the MONO position, the left and right channels are shorted in the stage following the tape and adaptor circuits.
SX-1250 BALANCE Control
A no-loss HB type variable resistor at center position is employed. An SEPP circuit is inserted as a buffer in the following stage. Muting Circuit
When the MUTING switch is set to the - 20dB position, the signal is attenuated by 20dB. Loudness Circuit This circuit is operated ON or OFF by the LOUD-
NESS switch and is intended to compensate for audibility characteristics of the human ear at low volumes. The VOLUME control variable resistor is tapped. Connecting a CR network at this point enhances low and high frequencies at low volumes. Tone Controls
Twin tone controls are employed with the SX1250. These consist of ultra-low and ultra-high (sub) controls in addition to the conventional BASS and TREBLE (main) controls. The signal is amplified to required level by a 2-stage FET and transistor direct coupled amplifier, after which a 2-stage NFB type tone control circuit is provided. The sub controls form the first stage and the main controls form the second stage of this circuit. With NFB type tone controls, C-B is applied to a single transistor amplifier. Frequency response becomes variable by providing selectivity in the circuit. The basic circuit of this stage is shown in Fig. 12.
R4
VR 2
R•
Fig. 12. Basic circuitry of N FB type tone control circuit
Midrange Operation The C1 and C2 reactances are considerably smaller than VR1 at frequencies above midrange, effectively shorting VRl. At frequencies below midrange, C3 reactance becomes large and in effect, opens the circuit. Consequently, the circuit becomes equivalent to that shown in Fig. 13 with respect to the midrange. In this figure, the circuits parameters are not changed by any change in position of the VR1 and VR2 sliders. The NFB amount is therefore fixed and the circuit gain is also fixed without regard to VR1 and VR2 slider positions.
R.
VR 2
R.
Fig. 13. Midrange operation of N FB type tone control circuit
Low Frequency Operation The reactance of C1 and C2 increases at low frequency to form a circuit as shown in Fig. 14. This reactance increases in proportion to the frequency declines. Also, the NFB amount varies greatly according to VR1 slider position. The circuit gain at low frequencies can therefore be varied by VRl.
C,
C2
Ra
R, Fig. 14.
VR ,
R.
Low frequency operation of NFB type tone control circuit ·
High Frequency Operation The considerably smaller reactance of C1 and C2 at high frequency in comparison with VR1 effectively shorts VR1 to from an equivalent circuit such as that shown in Fig. 15. C3 reactance decreases in , the same degree that the frequency increases and the NFB amount is now mainly controlled by the VR2 slider position. Consequently, the gain at high frequencies can be varied by VR2.
YR, R,
R4 Fig. 15.
YR 2
R,
High frequency operation of N FB type tone control circuit
15
Tone Defeat Circuit By setting the TONE switch to OFF, the above described tone control circuit becomes byed. Filter Circuits (Fig. 16) These are NFB type active filters with - 12dB/ octave slopes. The circuit combines a 2-stage CR element and emitter follower. Normal function of the emitter follower is provided in the band and by 100% NFB, gain becomes essentially "1". NFB is cancelled in the area of the cutoff frequency, composing a peak in the frequency response. This leads to improved and sharper CR filter response. In the actual circuit, CR elements for low and high filters both employ the same emitter follower and each can be selected ON-OFF. Power Amplifier Fig. 17 shows the power amplifier section. The input stage is composed of Q1 & Q2 differential amplifier, with the input signal applied to Ql. Q3 & Q4 differential amplifier comprise the second stage, with Q3 output composed at Q4 by Q5 & Q6 current mirror. Connecting collector and base of Q5 produces the equivalent of a diode. Q3 collector current produces a · forward voltage between Q5 base and emitter, biasing Q6. R1 and R2 in this circuit are equal, while Q5 and Q6 are the same type transistors. Consequently, when voltages between bases and emitters of Q5 & Q6 are equal, current flows in these transistors also become equal. This results in equal current flows in Q3 and Q6. Mutually opposite phase signals drive Q3 and Q4, resulting in mutually opposite phase collector currents. Q4 and Q6 therefore operate as push-pull.
-IZdB/oct
z
UJ
1-
~
-12 dB/oct
~~~··
z:
w
I-
Compos1!e curve
tt
~---------~
Fig. 16. Basic circuitry of filters
Power stage bias voltage is supplied by the voltage drop across D1, D2 and VR2. VR2 is a semi-fixed resistor for power stage bias adjustment, while D1 and D2 are Varistors for temperature compensation. A 3-stage Darlington connection is employed in the power stage (Q7-Q14), with output transistors Qll- Q14 in a complementary symmetrical parallel
Output
''~1
Ycc , o-- _ ___.__ _____,.__..___ _ _ ___,
.___,_---.~1----<1>-------0
Fig. 17. Schematic diagram for pow er amplifier
16
HIGH rllTIR switch
Ycc,
SX-1250 connection. The output center point is at OV from the balanced plus and minus power supply, while 100% DC NFB is applied to Q2 through R3. Because of this, circuit DC gain becomes OdB and DC voltage of the output center point is determined by Q1 base voltage. VR1 is a semi-fixed resistor for fine adjustment of the center point voltage to compensate for irregularities in circuit elements.
flows through the relay coil, operating the relay to turn on the power amplifier output circuit. The reverse bias of Q6 base from D6 & R19-R21 disappears when the power supply is set from ON to OFF. Q6 remains ON however, due to the residual power supply voltage. C4 very rapidly discharges, Q7 base potential drops and Q7 turns OFF. The relay releases and the power amplifier output circuit turns OFF.
SPEAKERS Switches The SX-1250 is provided with 3 sets of speaker terminals (A, B, C). Since the power amplifier can become overloaded if all three sets are used simultaneously, when all 3 SPEAKERS switches are set to ON, the circuit functions as if all switches were OFF and the indicator lamps extinguish.
Note: QS is normally ·OFF due to base bias and does not participate in the muting operation.
4.3 PROTECTION CIRCUIT This circuit protects the power transistors in case of overload, the speakers in case of power amplifier malfunction, and also performs a muting function when the power supply is turned ON or OFF. The protection circuit is composed of three sections (Fig. 18). Power amplilier + Vee
Operation by Detector Circuit Command Command from the detector circuits through one of D3, D4 or D5 and are applied in the form of a current flow. Q5 is normally reverse biased through R14, but when a large current flows through on of these diodes, Q5 base potential declines according to the voltage drop at R14. Q5 then becomes ON, Q6 base potential rises and Q6 becomes ON. C4 rapidly discharges and Q7 base potential drops, turning Q7 OFF. The relay releases and the power amplifier output circuit becomes cut off. -t Vee o--- ----.--1"'"---.,..---, I Relay
01erload detector
~ ceil
Detectors
Center poi1l pote1lial •elector Vee
R••
R••
Relay drin
Fig. 18.
Rf.-Gh
Block diagram of protection circuit
1. Relay Driver Circuit (Fig. 19) The relay which connects the output circuits is driven by this circuit. It also performs a muting function to prevent unpleasant noise during ONOFF operation of the power supply as well as opening the output circuit on command from the detector circuits. Muting Operation When the power supply is turned ON, Q6 base is reverse biased through D6 and R19-R21, turning Q6 OFF. Q7 base potential rises as C4 charges through R22 & R23, and Q7 turns ON several seconds later. The collector current of Q7 then
06
o-~Mr-.._."Nv~__,-'V\/Ir-,.._--o
AC 1. 5V
Fig. 19. Schematic diagram of relay driver circuit
2. Overload Detector Circuit Shorting of the power amplifier load or a load impedance below the specified value causes a command to be sent to the relay drive circuit. This is illustrated in Fig. 20. With the output stage in class B operation, when Qa is operating in the positive half cycle, Qb becomes cut off and the signal current flows as indicated by the solid arrows in Fig. 20. Point D potential at this time is the point A potential divided by R1 and R3. Also, point C potential is the point A potential divided by RE1 and RL (load). Point D is connected to Q1 base and point C to Q1 emitter through R2 and RE2. When RL is extremely small, the point C potential becomes considerably lower than point D. This potential difference forward biases Ql. Q1 turns ON and current flows in D3.
17
Qb operates in the negative half cycle and Qa becomes cut off. The signal flows is indicated by the broken line arrows in the center of Fig. 20. Ql is biased by the potential difference between point C and point E. If RL is extremely small, the point C potential becomes considerably higher than that of point E. Ql turns ON and current flows in D3. If large current flows in Qa and Qb, Ql becomes ON due to the REI and RE2 voltage drops, and current flows in D3. Cl prevents faulty operation due to external noise.
+ Vee
+ Vee
l '
I
Power
'
I
a~a,lilier
I '
I' I
Vee
- Vee
Fig. 21 . Basic circuitry for center point potential detector
- Vee Fig. 20. Basic circuitry for overload detector
3. Center Point Potential Detector Circuit If a DC potential is produced at the junction point of the power amplifier, a command is sent to the relay drive circuit. Fig. 21 shows this operating principle. Q3 and Q4 compose a differential amplifier. When the same input is applied to both input terminals (Q3 and Q4 bases), no output is present. However, if there is a difference between the terminal inputs, the difference is amplified and becomes the output between the two collectors. During normal operation, an AC signal only is present at the junction point. As C2 reactance is sufficiently low, the same signal is applied to Q3 and Q4 bases, resulting in an absence of output at the collector sides. When a DC potential is produced at the junction point, it becomes the input of Q3 only. If the voltage is negative, Q3 collector current declines And at Q4 the collector current increases and the potential drops, causing current to flow through D4. If the DC voltage is positive, Q3 collector current increases and the potential drops, while at Q4 the collector current decreases and the potential rises. Current therefore flows through D5.
18
4.4 POWER SUPPLY CIRCUIT All power supplied are regulated up to the power amplifier predriver stage. Independent power transformer secondary windings are employed for left and right channels in the power stage. Each channel is also supplied from an independent bridge rectifier and two 22,000J.L F capacitors. Position lamps are lighted by DC from a regulated power supply for stable illumination. Inrush Current Suppressor Circuit Ordinarily, power transformer inrush current when the power supply is turned on is opposed by DC resistance of the winding and instantaneous inductance of the air core. In the toroidal power transformer used in the SX-1250, both these factors are very low. Combined with the high charging current of the four 22,000J..LF capacitors in the secondary, inrush current can reach several hundred amperes. A resistors is therefore provided in series with the primary coil to suppress this inrush current to several tens of amperes. This resistor becomes shorted after power transformer excitation. The inrush suppressor circuit is shown in Fig. 22. Sl is the POWER switch and S2 a relay . The Microtemp is a temperature responding fuse. S2 is open before power is turned on, connecting the power transformer primary coil in series with Rl and the Microtemp. After power has been turned on, the relay operates when DC current is obtained from the rectifier, closing S2. If S2 fails to close, due to power supply or relay malfunction, Rl heating opens the Microtemp (109° C operating temperature), thus opening the primary circuit.
sx-., eso ! ' Relay S,
Fig. 22.
Rectifier
Fuse
Basic circuitry for inrush current suppressor
5. LEVEL DIAGRAM AUX (TAPE) PHONO u-- -- - - 1 .
8Q [ dBV]
I I I
SPEAKER 39V
'
I
30
20
I
10
I
co
'"0 N C'>")
POWER IN l V /
0 - 10
,
I
- 20 - 30
- 40 - MIC 6. 5mV
I
- 50
I
I
AUX 150mV
/
/~
<.D
T
co
"0
en en
FR EQU ENCY: 1kHz
C'>")
PHONO 2. 5mV
- 60 -8. 3dB
19
SX-1250
6. BLOCK DIAGRAM SWrTCHES : S• • FM 75.0. Uf.:BA L.
POWEK
(SPEAKERS) S2s-: SPEAKE~S A $27 : SPEAKERS B S 28; SPEAKERS C
( FUNCTION) S11 : AM S12 :
FM
S•3:
PHONO 1 PHONO 2/MIC AUX
S14 ·
GND
Sts:
Sz~:
FM MUTING
s30 :
FM MULTI PATH
S31 :
FM DE-EMPHASIS
AM I I r-- - J I
A:
:srt:•lEO
I mJ ".._r.t ~· &-
,., ---~ 1
------
AUX
----
___ j
St6: Sn: Sta: S19:
TAPE MONITOR 1 TAPE l'I.ONITOR 2 APE DUPLICATE ADAPTOR
Sz1 :
MODE MUTING
Sn:
LOUDNESS
Sz3:
TONE
5(4: Sts ·
LOW FlLTER HIGH FILTER
520:
PHONO 1 PHONO 2
!
MIC
PRE OUT
MIC
!
PRE OUT
r-·---
AU X
J'oNe Ctrcwt JProtecttJn ~. . . . +-t...._...} ;tamp
AC POWER 120V
--1---tt+-]
AC outlets
SPEAKER A SPEAKER B
Con·.tol
SPEAKER C
secC,on
PHONES
,.-'V\.fV-.-~
SPEAKER A Power amJ.
SPEAKER 8 SPEAKER C
•L._ ___
20
.L__ ___________________
Sza
21
7. DISASSEMBLY Top Plate
Remove the six screws (A) to detach the top plate. Wooden Cover
Remove the two screws (B) on each side of the wooden cover. A
A \?
~B
Fig. 25
Bottom Plate
Remove the fifteen screws to detach the bottom plate.
Fig. 26
22
SX-1250
Front
nu~n["
Loosen s the kthe TU NING and VOL all R emove nobsetscrews by pulrof mm the three Remove the sub-tone the two a nUME knobs from with the alt op h exagona! cont edge of wrench the f ront . R emove volume ro shafts. .
:;'"'ws
. .,
l Tone Am p IT R I ler Assembl
emove the th ree screwsy (C). Flat Am p IT R I ler Assembl
emove the th ree screws y (D). Fig. 28
Front
Fig. 27
Loosen the setscrews E
f$f
~"' EE
E~ F
Speakers Switch A
Remove the fo
~·
ssembly .--
ur screws (E).
Filter Am PIT R I ler Assembl
emove the t wo screws (F). y Function Switch
Remove the t
Assembly
wo screws (G).
---~ll"f:(~ ~
Fig. 29
24
8. PARTS LOCATION 8.1
FRONT VIEW
Knob (FILTER 8kHz) AAD-114
Knob (FM MULTI PATH) AAD-114
Knob (AM) AAD-1 14
Knob (FILTER 30Hz) AAD-114
Knob (FM MUTING) AAD-114
Knob (FM) AAD-114
Knob (SPEAKERS C) AAD-114
Front assembly ANB-386
Knob (PHONO 1) AAD-114
Knob (SPEAKERS B) AAD-114
Knob (PHONO 2/ MIC) AAD-114
Knob (SPEAKERS A) AAD -114
Knob (AUX) AAD -114
Knob (Tuning) AAA-034
________
•
.............., ...................__,..,._: -r -.'. -.__._.• ._.._...._._.....
c5 ...
.
._.._...___..;_._.~Me-.~.-.-.-~•
o (). ?5
6
~
......
Knob (MUTING ) AAD -113
~~.
r~
r'· -· t'-
••
·· (~
lR£U1..£ ioi'l,h .. ,
. ........... f.
.r
(
II
-~~-
/
• • • •
~I
"" II -II
·I
I
I
)
Knob (VOLUME) AAB-104
..
Knob (LOUDNESS) AAD-113
Knob (POWER) AAD-113
Knob (MODE) AAD-11 3
Knob (BASS 50H z) AAB -100
25
Knob (BALANCE) AAB-100
Knob (BASS 100H z) AAB-100
Knob (TREBLE 10kHz) AAB- 100
Knob (TAPE MONITOR 1) AAD-113
Knob (TONE) AAD-113
Knob (TREBLE 20kHz) AAB-100
Knob (TAPE DUPLICATE) AAD-113
l
Knob (ADAPTOR) AAD-113
Knob (TAPE MON ITOR 2) AAD-113
SX-1250
8.2 REAR VIEW
Terminal (TAPE 2) AKB -030
Connector socket 5P ( R EC/ PLA Y) AKP-007
Terminal (TAPE 1) AKB -030
Term inal (ADAPTOR) AKB-030
Terminal (INPUT) AKB -033
Terminal (SPEAKERS) AKE-014
Terminal (GND) • AKE-012 Bar-antenna holder W72-092
Ferrite bar-antenna ATB-051
Terminal (ANTENNA) AKA-004
Slide switch (DE-EMPHASIS) ASH -015
Terminal (PRE/ POWER AMP) AKB -030
AC power cord ADG-013
AC socket (AC OUTLETS) AKP-005
Terminal (FM DET OUT) AKB-0 19
28
8.3 TOP VIEW
Power transformer ATT-267
Electrolytic capacitor (22 OOOpF 80V) ACH -056 '
Electrolytic capacitor (22 OOOpF 80V) ACH-056 '
Relay (S2) ASR -015
Power amplifier assembly AWH -048
Power amp lifi er assemb ly AWH -048
Stabili zer assembly AWR -106 Protection circuit assemb ly AWM-091
Tuner assembly AWE -068
Tuning drum assembly AXA-070
Equalizer amplifier assembly AWF -021
FM front end AWB-023
•
-------·
Lamp assembly (PL 1- PL4 8V 0 3A) AEL -056 ' · Tuning shaft assembly AXA -111
Lamp board assembly AWX-096
I
29
•
I
SX-1250
8.4 BOTTOM VIEW
Ferrite balun T22-025
Fuse lA (FU l ) AEK-106
Fuse 12A (FU6, primary) AEK -301
Fuse 1A (FU2) AEK-106
Fuse 1A (FU3) AEK-106 Power supply assembly AWR -107 Fuse 1A (FU4) AEK-106
Fuse 1.5A (FU5) AEK-104
Filter ampl ifier assembly AWM -089
Speakers switch assembly AWS-095
Function switch assembly AWS-094
Flat amplifier assembly AWG-042
Ceramic capacitor (0.01,uF 150V) ACG -003
1
Control amplifier assembly AWG -041
32
8.5 FRONT VIEW Double meter (SIGNAL/TUN IN G) AAW-040
Push switch (FILTER, FM MUTING, MULTI PATH) ASG -098
Indicator (STEREO) AAT-028
Indicator AAT-027
Indicator (SP-A, SP-B, SP-C) AAT-026
Dial scale plate AAG-106
Tuning shaft assembly AXA-111
Push switch (SPEAKERS) ASG-094
Push switch (AM, FM, PHONOI, PHON02/ MIC) ASG·095
Phone jack (PHONES) AKN-010
Lever switch (POWER) ASK-080
..
•
Phone jack (M IC) AKN-013
o.
Lever switch (MUTING) ASK-090
------------~----~~
Variable resistor ( 102k, 5-step, BASS 50H z) ACV-165
Lever switch (LOUDNESS) ASK -090
Variable resistor ( 102.6k, 11 -step, BASS 1OOHz) ACV-166
Lever switch (TONE) ASK-090
Variab le resistor (99k, 11·step, TREBLE 1OkHz) ACV-167
Variable resistor ( 102k, 5·step, TREBLE 20kH z) ACV-168
33
Variable resistor (50k, 32-step, VOLUME) ACV· 169
Lever switch (TAPE MONITOR 2) ASK·092
Lever switch (TAPE MONITOR 1) ASK-092
Lever switch (DUPLICATE) ASK·084
Lever switch (MODE) ASK-090
Variable resistor (100k-HB, BALANCE) ACV·163
Lever switch (ADAPTOR) ASK -092
SX-1250
9. ADJUSTMENTS 9.1 AM TUNER 1. Set function switch to AM . 2. Connect AM signal generator through 1k-ohm resistor to AM antenna terminal. 3. Set DUPLICATE switch to OFF and connect an AC voltmeter to TAPE 1 REC jacks. 4. Set AM SG for 400Hz 30% modulation 100dB output. 5. Set SX-1250 dial indication and AM SG frequency for 600kHz. 6 . Adjust T3 core for maximum reading on AC voltmeter. 7. Set SX-1250 dial indication and AM SG frequency for 1 ,400kHz.
8. Adjust TC1 for maximum reading on AC voltmeter. 9. Set AM SG for 30dB output. 10. Set SX-1250 dial indication and AM SG frequency for 600kHz . 11. Adjust T3, T4 and bar antenna core for maximum reading on AC voltmeter. 12. Set SX-1250 dial indication. and AM SG frequency for 1 ,400kHz. 13. Adjust TC1, TC2 and TC3 for maximum reading on AC voltmeter. 14. Repeat steps 10~ 13 to eliminate variations in AC voltmeter readings.
AC Voltmeter
.. ,. 4
~
.
-• •
AM Signal Generator
~
•
oo@ @ 0
00
0 0 0 0
Fig. 30
35
Tuner Assembly
9.2 FM TUNER FM Front End
1. Set function switch to FM. 2. Set FM MUTING switch to OFF. 3. Connect FM signal generator through 300-ohm dummy load to 300 ohm FM antenna terminals. 4. Set DUPLICATE switch to OFF and connect AC voltmeter to TAPE 1 REC jacks. 5. Set FM SG for 100dB output at 400Hz and 100% modulation. 6. Set SX-1250 dial indication and FM SG frequency for 87.4MHz. 7. Adjust T5 core for maximum indication on SIGNAL meter. 8. Set FM SG for 8dB output and adjust cores of T1, T2, T3 and T4 for maximum reading on AC voltmeter. 9. Set FM SG for 100dB output. 10. Set SX-1250 dial indication and FM SG frequency for 106MHz. 11. Adjust TC5 for maximum indication on SIGNAL meter. 12. Set FM SG for 8dB output and adjust TC1, TC2, TC3 and TC4 for maximum reading on AC voltmeter. 13. Repeat steps 5 ~ 12 to eliminate variations in AC voltmeter readings. 14. After completing above adjustments, adjust T6 core for maximum reading on AC voltmeter. Bottom View of FM Front End
c@-T2
TC2
Multiplex Decoder
24. Connect MPX SG (multiplex signal generator) to the external modulator terminals of the FM SG and set the FM SG for external modulation. 25. Connect PILOT OUT terminal of MPX SG to horizontal input terminal of oscilloscope. 26. Using a probe, connect oscilloscope vertical input terminal to terminal No. 9. 27. Set FM SG for 98MHz 60dB output unmodulated. 28. Tune SX-1250 for exact center of scale indication on TUNING meter. 29. Adjust VR2 so that 4 : 1 frequency ratio Lissajous' (see note below) figure becomes stationary. 30. Set FM SG for 1kHz (L or R), ±67.5kHz deviation, 19kHz (pilot signal) and ±7.5kHz modulation. 31. Adjust VR3 for minimum L-R crosstalk. Note: Signal at terminal No. 9 is 76kHz sawtooth waue and MPX SG pilot out is a 19kHz sine waue. These form a Lissajous ' figure such as shown in Fig. 32.
&0&0 TC3
15. Connect DC voltmeter to terminal No.43. 16. Tum VR1 and VR3 fully counter-clockwise. 17. Detune SX-1250 to where only noise is received and adjust T1 core for center of scale indication on TUNING meter. 18. Set FM SG for 98MHz 60dB output. 19. Tune SX-1250 for exact center of scale indication on TUNING meter. 20. Adjust T2 upper core for OV (±lOmV) between terminal No. 43 and ground. 21. Adjust T2 lower core for minimum distortion. 22. Repeat steps 20- 21 several times. 23. Set FM SG for 100dB output and adjust VR1 so that SIGNAL meter indicates 4.7 on the scale.
-- -=
m
Cj
TC4
0
~~
c@f'T4
~.
0 r~
T5
0
((@)-T6
li
~
I
~~ ~
I ..a
~n ~
I II Fig. 3 1
36
a 14 =-1-
a f4
TC1
I
.,
I
~
I!!!!!I I
c
Fig. 32
SX-1250
AC Voltmeter Distortion meter
~
0@) 00 MPX Signal Generator
0
0
FM Signal Generator
~@ 0
00 dummy antenna
@ 00
Q
0 0
0 0 0 <0
0
®
Probe VERT.
i HORIZ.
p
DC Voltmeter
• FM Front End Fig. 33
37
9.3 POWER AMPLIFIER
9.4 STABILIZER
1. Tum VR2 fully counter-clockwise before turn-
1. Adjust VRl for 65V between terminals No.l7 (+)and No.12 (ground). 2. Adjust VR2 for 65V between terminals No.l2 (ground) and No.l6 (- ).
~-
3. 4. 5. 6. 7. 8.
ing on the power. Remove jumper plugs connecting POWER IN and PRE OUT jacks. Connect 5.1 k-ohm resistor to POWER IN jacks. Set power amplifier for no load. Set POWER switch to ON. Adjust VRl for OV between terminal No.9 and ground. Adjust VR2 for lOOm V between terminals No.7(+) and No.l9 (- ). Allow set to warm up for at least 10 minutes, then readjust.
Stabilizer Assembl Fig. 34
'
Fig. 35
38
SX-1250
10. DIAL CORD STRINGING 1. Remove the wooden cover and the front .
2. Remove the three screws to detach the blind sash (Fig. 36). 3. Turn tuning drum fully clockwise (as viewed from X direction in Fig. 37). 4. Tie one end of cord to stud on inner section of tuning drum (more easily performed by loosening setscrew and temporarily removing tuning drum from shaft). 5. Route cord through tuning drum cutout, make a half turn around the drum, then route in sequ'ence to pulley A. 6. Wind cord 3 turns clockwise (as viewed from rear ) around tuning shaft, then route to pulley B- pulley C-pulley D. 7. Wind cord two turns around tuning drum and tie to spring hook so that tension is applied to the cord. 8. Turn TUNING knob and confirm normal cord motion, then trim off excess cord. 9. Turn the tuning knob fully counterclockwise and fix the dial pointer to cord so that it indicates 87 .4MHz on the dial scale.
Dial Pointer Installation Caution Metal portion of dial pointer is plated. If this section is touched directly by hand or fingerprints and other impurities, it is difficult to remove dirt from aventurine finish. As this is not desirable in of both appearance and anticorrosion, take extreme care not to touch the metal section when handling the dial pointer,
Fig. 36
Starting point (87.4MHz)
Tuning drum
Spring hook
c Tuning shaft
~
Fig. 37
39
11. EXPLODED VIEWS NOMENCLATURE OF SCREWS, WASHERS AND NUTS
The following symbols stand for screws, washers and nuts as shown in exploded view. Symbol
Description
Symbol
Description
Shape
Brazier head tapping screw
AT
Shape
(JeD
E type washer
EW
Cb
~
@
~
PT
Pan head tapping screw
(jc:D
FW
Flat washer
BT
Binding head tapping screw
(leo
sw
Spring lock washer
CT
Countersunk head tapping screw
[)en
N
Nut
TT
Truss head tapping screw
(]en
WN
Washer faced nut
OCT
Oval countersunk head tapping screw
tn=o
ITW
Internal toothed lock washer
(g
i
PM
Pan head machine screw
(jc::J
OTW
Outernal toothed lock washer
@
J
CM
Countersunk head machine screw
[)c=:l
sc
Slotted set screw (Cone point)
a
D
OCM
Oval countersunk head machine screw
[)1:J
SF
Slotted set screw (FIat point)
€}
D
TM
Truss head machine screw
(jc:l
HS
Hexagon socket headless set screw
@
ID>
BM
Binding head machine screw
{)c::l
ocw
Oval countersunk head wood screw
PSA
Pan head screw with spring lock washer
ao
cw
Countersunk head wood screw
PSB
Pan head screw w ith spring lock washer and flat washer
(1:=1
RW
Round head wood screw
PSF
Pan head screw with flat washer
oP
EXAMPLE PM 3x8
L _ length in mm ( I ) diameter in mm ( d ) Symbol
40
ln:::=cl
l/ J
t
T1
FW 9
1
l__ thickness in mm ( t )
~ diameter in mm (d)
Symbol
-
© I © ~ @ ~
~
....
~ --~
G
SX-1250 1
2
4
3
5
Exterior
6 NOTE: Parts indicated in g·reen type cannot be supplied.
Screw M4x8 ABA-123
A
Screw 3x8 ABA-002
A
Screw 3x8 ABA-081 Screw 3x8 ABA-002
Top plate ANE-105
See Page 48.
Screw 4x15 ABA-113
Screw 3x8 ABA-081
See Pages 43-47. B
B Wooden cover AMM-049
Coil spring ABH-022 AT 3x8 Spacer 'il AEC-258
Screw 4x15 ABA-113 Mask AED-018
Screw 4x8 ABA -012
Front assembly ANB-386
c
c Washer faced nut ABN -024
Screw 4x8 ABA-012
Knob (BASS 50Hz, 100Hz) Knob (TREBLE 10kHz, 20kHz) Knob (BALANCE) AAB -100
Foot AEC-178 Screw 4x8 ABA-012
Knob (MUTING, LOUDNESS, MODE) Knob (POWER, TONE, ADAPTOR) Knob (TAPE DUPLICATE, MONITOR) AAD-113
D Knob (Tuning) AAA-034
D Screw 4x8 ABA-012
Knob (VOLUME) AAB-104
AT 4x16
Foot AEC-178 AT 4x16
1
2
3
4
5
6 42
3
2
1 'de Component (FRONT)
Tilp Sl
Pulley shaft
RT 3x6
RT 3x8
Rubber spacer AEB-087
--===~5[===;~~~---=:::::b:suuppl ied. 6
-
ABA-114 Pulley AEC-101 RT 3x6
A
4
NOTE: Parts indicated .m g'""" typoo•nnot e'
RT 3x6
RT 3x6 Lamp ass, mbly (PL 1- PL4, 8V 0.3A) AEL-056
A
I RT 3x8 RT 3x6
Lamp ! board assembly AWX-096 Rubber bracket B AEB-086 Indicator (STEREO) AAT-028
RT 3x8 Acrylic boardAEC-272 RT 3x6 Pull y shaft AB.4,-114 Pulley AEC-101
RT 3x6
B
Tuner assembly AWE -068 Tum·ng drum assembly AXA-070
B RT 3x6
RT 3x6
Equal izer amplifier assembly AWF-021
RT 3x8 Double meter (SIGNAL/TUNING) AAW-040 Rubber bracket A
RT 3x6
AEB -085 'th leads (8V, 50mA) Lamp WI (PL " O) ( PL8) PH -1 AM AEL-q74 AE L-076 PH-2 (PL11) FM (PL9) AE L-q72 AEL-075 AUX jPLI2)
c
Tunm . g shaft assembly
AXA-111 Indicator (AM, FM ' PH -1,
\
PH-~. AUX) Pul(ey ~haft ABA-114
AAT-027 Washer 9
RT 3x6
c
AEL-073
Pul~y ,~small)
M45-086 Nut 9'~'
,~.
AE -2.J6
J~
871·004 Shaft cover AAT-025
\T
-~
Blind sash AAP-037
base ABN-022
Blf3x6
D
D
Pulley (small) AEC-256
1 43
Pulley shaft ABA-114
2
3
4
5
6
SX-1250 2
1
4
3
5
Top Side Component (REAR) Power amplifier assembly AWH-048 Screw 3x8 ABA-002
NOTE: Connection cable housing ADX-033 Connection cable housing ADX-032
RT 3x10
Parts indicated in green type cannot be supplied.
Protection circuit assembly Connection cable housing AWM-091 ADX-031 I Connection cable housing Stabilizer assembly ADX-036 Connection cable housing AWR-106 ADX-030 Connection cable housing ADX-034 Connection cable housing ADX-035 Connection cable housing ADX-039
A t 1
6
Connection cable housing ADX-037 Transistor 2SD555-R PM 3x16 RT 3x10 /
A
Connection cable housing ADX-033 Connection cable housing ADX-032
B
B
Power Amplifier assembly AWH-048
RT 3x10
Screw 3x8 ABA-002 Connection cable housing ADX-038
c
c
RT 3x6
Insulator wafer AEC-076
Connecting plate AKF-053 Spring lock washer ABE-018 Binding head screw M 4x5 ABA-129
D
1
2
RT 3x6 Connecting plate AKF-053 Spring lock washer ABE-018 Bindif,g head screw M 4x5 ABA1129
3
RT 3x10
4
Transistor 2SD555-R RT 3x10
RT 3x6
5
D
6 46
2
1 Bottom Side Components
3 NOTE: Parts indicated in green type cannot be supplied.
Fuse holder 1P AKR-028
Terminal strip 2P AKC -030
Relay ASR-015
A
A RT 3x8 Wire er AEC-151
RT 3x6
RT 3x6 Terminal strip 2P AKC -038
Terminal strip 2P AKC-030
B
;?
RT 3x8
B
RT 3x6 Lever switch (POWER) ASK-080
~ RT 3x6
~ l
T3x6
Power supply assembly AWR-107
C
c
Speakers switch assemb ly · AWS-095
Fuse 1A (FU1) AEK -106 Fuse 1A (FU2) AEK-106 Fuse 1A (FU3) AEK-106 Fuse 1A (FU4) AEK-106 Fuse 1.5A (FU5) AEK-104
D
Control amplifier assembly AWG-041
D
Microphone jack assembly AWX-097 Flat amplifier assembly AWG -042
1 47
2
3
1
2
3
Rear Component
NOTE: Parts indicated in green type cannot be supplied.
A
A Terminal (TAPE 2) AKB-030 Terminal (PRE/POWER AMP) AKB-030 T erminal (FM DET OUT) AKB-019 Terminal (TAPE 1) AKB -030
B
De-emphasis switch assembly AWX-099 Terminal (INPUT) AKB-033
~
,
T Nut7¢> 871-010
Internal toothed lock washer ABE-006
l
Terminal (ANTENNA) AKA-004
c
a RT 3x8
RT 3x8
~
9M 3x8
I
r T-3x10
RT 3x10 Strain relief AEC-079
Strain relief AEC-079 Screw 3x8 ABA-002 AC power cord ADG-013
c
RT 3x8
Terminal (GND) AKE-012 RT 3x8 RT 3x6 Bar-antenna holder W72 -092
D
D
1 48
2
3
SX-1250 1
2
Parts indicated in green type cannot be supplied. Lever switch (MONITOR 2) AKS -092 Lever switch (ADAPTOR)
Lever switch (DUPLICATE) ASK -084 Lever switch (MONITOR 1) ASK-092
~K~2
A P C bo rd
t-
3 NOTE:
Flat Amplifier Assembly (AWG-042)
Variable resistor (100k-HB, BALANCE) ACV-163 Variable resistor (50k, 32-step, VOLUME) ACV -169
d mrt I
Screw ABA-116
I
A
Lever switch (MUTING) ASK-090
Lever switch (LOUDNESS SK-090 Lever switch (MODE) ASK-090
B
Washer faced nut ABN-024
B Union nut ABN-021
PC. 'Jo ra
Control Amplifier Assembly (AWG-041) RT 3x6
Variable resistor (102.6k, 11 -step, BASS 100Hz) ACV -166 Variable resistor (102k, 5-step, BASS 50Hz) ACV -165
c
h £ Ia cov.•r
Lever switch (TONE) ASK -090 Variable resistor (99k, 11-step, TREBLE 10kH z) ACV-167 Variable resistor ( 102k, 5-step, TREBLE 20kHz) ACV -168
P C bo:1rd held '!leta
Washer faced nut ABN -024
D
Screw 3x6 ABA-116 Washer faced nut ABN -024
c
@( P (..
D
bO r
RT 3x6
1
2
3 4 9
2
1 Switch Assembly (AWS-094)
3 NOTE: Parts indicated in green type cannot be supplied.
Push switch (AM, FM, PHONO 1, PHONO 2/MIC, AUX) ASG-095
Switch Assembly (AWX-099)
A
A
Slide switch (DE -EMPHASIS) ASH-015
p (
PC bo
8
Switch Assembly (AWS-095)
rd
Microphone Jack Assembly (AWX-097)
Push switch (SPEAKERS A, B, C) ASG-094
8
Phone jack (PHONES) AKN-010
~
Phone jack (MIC) AKN -013
I
PC b
r
c
c Filter Amplifier Assembly (AWM-089) Push switch (FILTER, FM MUTING, MULTIPATH) ASG-098
5P Connector Assembly (AWX-062) 5P connector socket ( REC/ PLA Y) AKP-007
p
l,
D
1 50
2
b
3
r
D
12. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTS NOTE: 12.1
• Capacitors: in fJ.F unless otherwise noted p:pF • Resistors: inn, *W unless otherwise noted k:kn, M :Mn
MISCELLANEOUs-PARTS
FUSES
SEMICONDUCTORS Symbol
Description
Part No.
Symbol
01 02 03 04 05
Transistor Transistor Transistor Transistor Transistor
2SB600-R 2SB600-R 2S0555-R 2S0555-R 2SB600-R
FU1 FU2 FU3 FU4 FU5
06
Transistor Transistor Transistor
2SB600-R 2SD555-R 2SD555-R
FU6
Q7
08
Part No.
Description Fuse Fuse Fuse Fuse Fuse
I
AEK-106 AEK-106 AEK-106 AEK-106 AEK-104
1A 1A 1A 1A 1.5A
Fuse 12A (primary)
AEK-301
COILS AND TRANSFORMER Symbol
SWITCHES Symbol S1 S2
Description Lever switch (POWER) Relay
Part No. ASK-080 ASR-015
Description
Part No.
Ferrite balun Ferrite bar-antenna Power transformer
T1 T2 T3
T22-025 ATB-051 ATT-267
RESISTOR LAMPS
Symbol Description
Symbol
Description Carbon film
R1 PL1 PL2 PL3 PL4 PL5
PL6 PL7 PL8
assembly {8V, 0.3A) assembly {8V, 0.3A) assembly {8V, 0.3A) assembly (8V, 0.3A) with leads (8V, 50mA, SP-At
AEL-056 AEL-056 AEL-056 AEL-056 AEL-074
Lamp with leads {8V, 50mA, SP-B) Lamp with leads (8V, 50mA, SP-C) Lamp with leads (8V, 50mA, AM)
AEL-072
Lamp Lamp Lamp Lamp Lamp
PL10 PL11
PL1 2 PL13
2.2M
Y:.W
RDY:.PS 225J
CAPACITORS Symbol
Description
Part No.
C1 C2 C3 C4 C5
Electrolytic Electrolytic Electrolytic Electrolytic Ceramic
22,000 22,000 22,000 22,000 0 .01
80V 80V 80V 80V 50V
ACH-056 ACH-056 ACH-056 ACH-056 CKDYF 103Z 50
AEL-076
C6 C7
Lamp with leads (8V, 50mA, FM) Lamp with leads (8V, 50mA, PH-1) Lamp with leads (8V, 50mA, PH-2)
AEL-075
C9 C10
Ceramic Ceramic Ceramic Ceramic Ceramic
0.01 0.01 0.01 0.01 0.01
50V 50V 50V 50V 50V
CKOYF CKOYF CKOYF CKOYF CKOYF
Lamp with leads (8V, 50mA, AUX) Lamp with leads {8V, 50mA, STEREO)
AEL-073
C11 C12 C13 C14 C18 C19
Ceramic Ceramic O.Q1 Ceramic O.Q1 Electrolytic Mylar Mylar
50V 0.01 150V (DC1.4kV) 150V (OC1.4kV) 100 6V 200V 0.1 0. 1 200V
AEL-073
C8 PL9
Part No.
Part No.
AEL-074 AEL-072
AEL-069
I
103Z 50 103Z 50 103Z 50 103Z 50 103Z 50
CKOYF 103Z 50 ACG-003 ACG-003 CEA 101P 6 COMA 104K 200 COMA 104K 200
51
SX-1250 ExternaI Appearance of TranSIStor . sand ICs
HA1137 HA 1138 HA1196
HA 1201
910111213141516
~~h 5678
~,.
2SK30AW
2SA684A 2SC1384
2S8507P 2SB630 2 SD313P 2SD325R 2SD610
Inde_x
3SK39 3SK45
0
~G2 G1
2SA628 2SA720 2SA733 2SA750 2SA858 2 SA872A 2SC945A 2SC1318 2SC1439 2SC1775A
2SB600 2SD555 2SC1342
2SA899A 2sC1904
2SC1166
~ tY~
2SA725 2SA726 2SA850 2SC710 2SC869 2SC1312 2SC1313 2SC1735
m:c 52
2
1
3
4
6
12.2 SCHEMATIC DIAGRAM
PI\OTEC.T IOtl ASS'y
Aw" -051
Y,
A
A r ·-------~~~ ASS'y_ AWE ·.C!!.._ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
I
t
B
B
.,
C!l!:!J '~<
"' ~
m!!J PC'K 1
[!EJ
''"
c
l ..
c
[!!!)
..' l
"'"
"'
SMTCHfS;
S,
POWEf'
St
~fi..A'1
1
''"
J
9ES•STO'< • I'll OnM,I/-4'1" tS4fc TOlff\4.-..(:f \J'tlf.SS ~TI"'E.Aw SE. NOTED K : ~.a. 11 ~Q.
D
SIGNAl., \'Ol.T.AGE AT SPEMER O.JTP\.-T CA.F~C11'CflS;
I"UTII't:i
IN.-,.F !J'olfSS o·HfRIIIISf. NOTED P pF
LOIJDNE.~
D
W/8Q. lltH1
OC ~~MEf'IT 41 t..0 "'P\IT SISIII.Al V0~1'AGE AT NO JHP<JT S!:lNAl
0C
TO!<E \.OW FtLT[f\ HII;H FILTEf\ ~EAr.fO.. A.
SPE.IIKE.f\ 8 sPEAHff', C
1 53
2
3
4
5
6
12.3 INTERNAL CIRCUITRY OF INTEGRATED CIRCUITS
HA1138 (AM IC)
r ·----
~ ~ I~ I
!
HA1196
f _r___ _ i I I
i
7
•
'>
6
12
tO
II
55
SX-1250 TA 7061AP
HA 1201
.-------------,
~
4
12.4 THE CIRCUIT OF FM FRONT END (AWB-023)
I
I I
I I
56
2
1
4
3
5
6
12.5 TUNER ASSEMBLY (AWE-068)
A
A
34
33
Q1 IN
HA 1201
~2
HA 1201
Q4 TA7061AP
44-
12
30
B
35
~------+-------------_J
l2
c,
~--~
Css
R22 2.ZK
Q.:J1
Css 1'
10
B
0.01
+B
f1
2. 2p f-l 13 ±1V 32
11
O.l/35
13~1V
14 Qr;
RJl 2..2K L-------~~~-~--~~~~~~---+~~--~~--------------~~-o 13
MUT NG AUTO
out
2SC13H Multipatf'l
c
c .., Qe, Qs .OJO 0?
2SC.945A
osc vc
x3
T3
6.SV
Os
21 o------- - h --t-------. 1I II
~n~ ~ -~
E
26 E D
2'7
22
AN7 A"' ~CCAL V':... 8
23 E
2t.
RF
vc
25 t:
2.8
'7 ST PILOT
A'1
ANT 11 E
1 57
2
3
2
3
4
5
6
D
10
39 12 +B FM 25V CET out
vco t
4
5
6
SX-1250 2
1
4
3
5
6
AWM 089, No.5+---- - - - - - - - - - - . AWS-094, No.22~-----------,
A
A
AWM-089, No.4 + - - - - - - - - - - - - . AWG-042, No.1 AWR-106, No.10 ~--------_. AWM-089, No.1 ~------- AWS-094, No.35 ~-------. AWM-089, No.7~--....., AWS-094, No.31 "FM TIHI.IJNr. AWS-094, No.30 ...... ··~0Mt AWS-094, No.34+----~
c 33
1
t.H
034
c 35
c 36 c 37
c 38
c 39
c40 c 41
Fe
0 42
AWB-023, No. F + - - - ----1---.0r. 32
8
0 31
- 30 AWB-023, No.G - - - -++--.r.o 29
j~~ G
8
F!
AWB-023, N'o.H ~----4-f--.0./')44 AMANT BLU BLK ~ (VVJ
~~-~~-~.r.28
IYEW REO
~~--+--4-f--~v27
AWB-023,
No.C~ £~,-~-'--v"'26
~----------++-~-oo25
AWB-023, No.D ~----+--1--o- 24
-
.-++---of""l 23
c
~
c
AWS-094, No.38 ~---+-+---o~""~22 AWB-023, No.E
....., 21
c 20
FM DET OUT @-AWS-094, No.39-
AWS-094, No.33
;;;,
--....J
AWS-094, No.41-r-AWS-094, No. 3 2 + - - - - - -_.
AWS-094, No.B7 ~--'
AWR -1 06, No.9 + - - - - - - . . . J
D
D
AWX-099, No.2 _ _ _ _ __J AWX-099, No.3 +------....J AWX-099, No.1
t---------...J
AWX-099, N o . 4 + - - - - - - - - - - - l
1
2
3
4
5
6 60
Parts List of Tuner Assembly (AWE-068) SEMICONDUCTOR Symbol
Description
Part No.
Symbol
Description
Part No.
HA1201 HA1201 HA1137 TA7061AP HA1138
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
330 470 470 56 56
RDY..P5 331J RDY..P5 471J RDY..P5 471J RDY..P5 560J RDY..P5 560J
09 010
IC Transistor Transistor Transistor Transistor
HA1196 25C1312·G 25C945A·O 25C945A·O 25C945A·O
R11 R12 R13 R14 R15
Carbon Carbon Carbon Carbon Carbon
film film film film film
560k 470 680 47k 10k
RDY..P5 564J RDY..P5 471J RDY..P5 681J RDY..PS 473J RDY..P5 103J
011
Transistor
25C945A·O
Dl D2 D3 D4 05
Diode Diode Diode Diode Diode
152076 152076 152076 152076 152473
R16 R17 R18 R19 R20
Carbon Carbon Carbon Carbon Carbon
film film film film film
4 .7 k 47k 1k 15k 470
RDY..P5 RDY..P5 RDY..P5 ROY..P5 RDY..P5
472J 473J 102J 153J 4 71J
D6 D7
Diode Diode
152473 152473
R21 R22 R23 R24 R25
Carbon Carbon Carbon Carbon Carbon
film film film film film
470 5.6k 5.6k 220k 220k
RDY..P5 RDY..P5 RDY..P5 RDY..P5 RDY..P5
471J 562J 562J 224JNL 224JNL
R26 R27 R28 R29 R30
Carbon film Carbon film Carbon film Carbon film Carbon film
2.2k 470 2.2k 4.7k 2.2k
RDY..P5 RDY..P5 RDY..P5 RDY..P5 RDY..P5
222J 471J 222J 472J 222J
R31 R32 R33 R34 R35
Carbon film Carbon film Carbon film Carbon film Carbon film
2.2k 8.2k 8.2k 47k 30k
RDY..P5 RDY..P5 RDY..P5 RDY..P5 RDY..P5
222J 822J 822J 473J 303J
R36 R37 R38 R39 R40
Carbon film Carbon f ilm Carbon film Carbon film Carbon film
47k 30k 47k lOOk 1.8k
ROY..P5 473J RDY..P5 303J RDY..P5 473J RDY..P5 104J RDY..P5 182J
R41 R42 R43 R44 R45
Carbon Carbon Carbon Carbon Carbon
film film film film film
1.8k 1.8k 1.8k 3 .3k 3.3k
RD Y..P5 ROY..P5 RDY..P5 RDY..P5 RDY..P5
182J 182J 182J 332J 332J
R46 R47 R48 R49 R50
Carbon Carbon Carbon Carbon Carbon
film film film film film
15k 5.6 k lk 100k 560k
RDY..P5 RDY..P5 RDY..P5 RDY..P5 RDY..P5
153J 562J 102J 104J 564J
R51 A 52 A 53
Carbon film Carbon film Carbon film
100k 180 47k
RDY..P5 104J RDY..P5 181J RDY..P5 473J
01 02 03 04 05
IC IC IC IC IC
06 Q7
as
, •
TRANSFORMERS AND COILS Symbol
Description
Part No.
T1 T2 T3 T4
FM IF transformer FM DET transformer AM oscillator coi l AF RF coil
ATE-029 ATE-013 ATB-019 ATB-020
Fl F2 F3 F4 F5
FM ceramic filter FM ceramic filter FM ceramic filter FM ceramic filter AM ceramic filter
ATF-018 ATF-018 ATF-018 ATF-018 ATF·027
F6 F7 FB
Anti·birby filter Anti·birby filter FM low filter
ATF-023 ATF·024 ATF-028
L1 L2 L3 L4 L5
RF choke RF choke RF choke RF choke RF choke
T24-028 T24-028 T24-028 T24-028 ATH -007
coil coil coil coil coil
2.2J.t H 2.2J.tH 2.2J.tH 2.2J.tH 18J.tH
I
RESISTORS Symbol Rl R2 R3 R4 R5
61
Description Carbon Carbon Carbon Carbon Carbon
film film film film film
100 lOOk lOOk 470 150
Part No. RDY..P5 101J RDY..P5 104J RDY..P5 104J RDY..P5 4 7 1J RDY..P5 151J
Symbol
i
Description
Part No.
Symbol
R54 R55
Carbon film Carbon film
330 2 2k
RD%PS 331J RD%PS 223J
R56 R57 R58 R59 R60
Carbon Carbon Carbon Carbon Carbon
film f ilm f ilm film film
22k 22k 33k 5. 1k 3 .3k
RD%PS RD%PS RD%PS RD%PS RD%PS
223J 223J 333J 512J 332J
R61 R62 R63 R64 R65
Carbon Carbon Carbon Carbon Carbon
film film film film film
39k 2.2k 100 47 150
RD%PS RD%PS RD%PS RD%PS RD%PS
393J 222J 101J 470J 151J
R66 R67 R68
Carbon film Carbon film Carbon film
680 1k 47k
RD%PS 681J RD%PS 102J RD%PS473J
VR1 VR2 VR3
Semi-fixed Semi-fi x ed Semi-fi x ed
47k· B 4 .7k· B 150k-B
C92-048 A-018 A-014
I
.
CAPACITORS Description
Symbol
Part No.
-
TC1 TC2 TC3
Film t rimmer Film trimmer Film trimmer
ACM-002 ACM-002 ACM-002
C1 C2 C3 C4 C5
Ceramic Ceramic Ceramic Electrolytic Ceramic
0.01 0 .047 0 .047 2 20 0 .047
50V 25V 25V 16V 25V
C6 C7 C8 C9 C10
Ceramic Ceramic Ceramic Ceramic Elec tro lyt ic
0.047 15p 0.047 0.047 0.47
25V 50V 25V 25V 50V
CKDBC 4732 25 CCDSL 150K 50 CKDBC 4732 25 CKDBC 4732 25 CEA R47P 50
C11 C12 C13 C14 C15
Ceramic Ceramic Ceramic Ceramic Ceramic
0.01 0.047 0.047 0.047 0.01
50V 25V 25V 25V 50V
CKDYF 1032 50 CKDBC 4732 25 CKDBC 4732 25 CKDBC 4732 25 CKDYF 1032 50
C16 C17 C18 C19 C20
Ceramic Ceramic Ceramic Ceramic Ceramic
0.01 0.01 0.01 0.047 390p
50V 50V 50V 25V 50V
CKDYF 1032 50 CKDYF 1032 50 CKDYF 1032 50 CKDBC 4732 25 CCKSL 391 K 50
C21 C22 C23 C24 C25
Ceramic Ceramic Elec trolytic Electrolytic Electrolytic
390p 150p 10 47 470
50V 50V 16V 16V 16V
CCDSL 391 K 50 CCDSL 151 K 50 CS2A 100M 16 CEANL 470P 16 CEA 471 P 16
I
CKDYF 1032 50 CKDBC 4732 25 CKDBC 4732 25 CEA 221P 16 CKDBC 4732 2 5
Description
Part No.
-C26 C27 C28 C29 C30
Electrolytic Mylar Elect rolytic Electrolytic Polystyrene film
C31 C32 C33 C34 C35
4 .7 0.047 10 10 51 0p
-
25V 50V 16V 16V 50V
CEANL 4R7P 25 COMA 473J 50 CEANL lOOP 16 CEANL lOOP 16 COSA 511J 50
Polystyrene film 51 Op Electrolytic 100 Electrolytic 1 Ceramic 0.0033 Electrolytic 0.1
50V 16V 50V 50V 35V
COSA 511J 50 CEA101P16 CEA 010P 50 CKDY A 332J 50 CS2A OR1M 35
C36 C37 C38 C39 C40
Electrolytic Mylar 0.0033 Electrolytic Mylar 0.0033 Po lystyrene film 51 Op
25V 50V 25V
CEANL 01 OP 25 COMA 332J 50 CEANL 01 OP 25 COMA 332J 50 COSH 511J 50
C41 C42 C43 C44 C45
Electrolytic Electrolytic Electrolytic Ceramic Ceramic
C46 C47 C48 C49 C50 C51 C52 C53 C54 C55
sov 50V
50V
CSSA 010M 10 CSSA 3R3M 10 CSSA R22M 25 CKDYF 4032 50 CCDWK 150K 50
Polystyrene film 41 Op 0.01 Ceramic Electrolytic 4 .7 Ceramic 0.04 Ceramic 0.04
50V 50V 25V 50V 50V
COSA 411J 50 CKDYA 103J 50 CEA 4R7P 25 CKDYF 4032 50 CKDYF 4032 50
Ceramic Ceramic Ceramic Ceramic Ceramic
220p 0.01 0.01 3p 0.01
50V 50V 50V SOV 50V
CCDSL 221 K 50 CKDYF 1032 50 CKDYF 1032 50 CCDSH 0300 50 CKDYF 1032 50
C56 C57 C58 C59 C60
Electrolytic Ceramic Ceramic Electrolytic Electrolytic
10 0.01 0.01 0 .1 2 20
16V 50V 50V 35V 16V
CEA lOOP 16 CKDYF 1032 50 CKDYF 1032 50 CS2A OR 1M 35 CEA 221P 16
C61 C62 C63 C64
Electrolytic Ceramic Ceramic Ceramic
47 0.047 47p 0 .01
16V 25V 50V 50V
CEA 470P 16 CKDBC 4732 25 CCDSL 470K 50 CKDYF 103Z 50
I
3 .3 0.22 0.04 15p
10V 10V 25V
sov
OTHER Symbol
Description
Part No.
1Reed relay
ASR-005
SX-1250 12.6 DE-EMPHASIS SWITCH ASSEMBLY (AWX-099)
r-J1
2
• o 0
N
i15,us
L_----=-:__1 SOP
I
I
__j
4 00
AWE -068, No.1
3 AWE -068, No.4
00
AWE-068, No.5
00
2 1
-oo
AWE-068, No.2
C2 1200P o-H--o
C3 150P
o-tt-o S1
."~
l
~
0
~
0
o--tt-o C1 1200P
--''/"
I
Parts List of De-emphasis Switch Assembly (AWX-099) SWITCH
Sl
Part No.
Description
Symbol
Slide switch (DE- EMPHASIS)
ASH-015-0
CAPACITORS Symbol C1 C2 C3
Part No.
Description Mylar Mylar Ceramic
1200p 1200p 15()p
50V 50V 50V
COMA 122J 50 COMA 122J 50 CCDSL 151 K 50
63
2
1
3
12.7 EQUALIZER AMPLIFIER ASSEMBLY (AWF-021)
A
A
IC
'7
a J
8
B
:::s::
B
'
<::i
"'
0::
:-L
~
C) C)
C) C)
c
.r
N
3
a:::
1 0::
c
2 4
Q,-vQ4
Q5 "-' c: s
C= .·o Q, 1 (;:12
0
2SA850 2SA628A 1S2413
I
__j
WZ-240
0
1 64
2SA126S Q l3 2SC11'lSA Q·4 2SA8'12A c1--. 4 2SC1135 Ds.s 2SC869
2
3
SX-1250
I
1
R31 4-7
O.to 2 SA87'2A 0-8 2SC1175A 4 o------oqv 3r. +b'l20;~'=fl~ O.GV 0 GV' ¥ ~ ~'f.'2~/16 b+ 01 tS2473x2 D2 D4 ln473x2 D3 o.GV o .,. o o .,. o o I~ R o o Ioiii 0 26 220 ~ o---J\/V\r---0 49
~
o-.t ~ C23
~?
-
R2s220 R21 680 o--------~
R2175K
o----J\N\r----0
~ R23'39K
+ en
~
R4t SlK o----J\Nv-----0
~
o-ft--o
o-1 J-o
410/6.'3
49V
<
W!-21' • Ds
100/35
24V
R7
2SC1735
c
24 6V
2SCS69
•
Ct4 27P
470/6.3
o-Il-<>
RB o-------1\1\/v- OV120K 4
~ Q.2 ~726SfN
Rt2 IK
R46 tSK
o-----1\N'v---R4 lOOK o------JIN'v--R2 tOOK o
R3 lOOK G---J\N'v---0 Rt tOOK o
8
(
R37
ZR39
4.7K
• 47K
2SA6Z8A
<>-f t-o
2SA850
R47 15K
5
4
3
2
1
~
Q
Q
Q
Q
0
0
%,
~%
~AWS·094,
c
-
No.20
AWH-048, No.2
AWM-091, No.1
•
R40 150
6
AWH -048, No.3
I
~
7
AWS-094, No.19
R3s 47K
~
C6 68P o
11
B
"''A.~...
C4 47P
C2 1
Ct 1
9
0
O. GV 100/35
<
o--1 t-o
R6 2.2K
~
II
h
220/63
t~~-14~
4&5V 0.6V
o---J\111\r---0 Rto 4.7K
R5 2.2.K
c3 47p
+ Czs 0
R2o'
R14 1.54K
Rn l K
Cs 6SP o
R44 150
o---J\/V\r---0
-o
R?A 39K
9 2?0
o--ft-<>
~Q.l o---J\/V\r---0 R9 4.7K fN2SA7~
o--1 t-o
~
10
~
1 cs
2SA72! ~ \ ~ ~ •
o-t J-<> sv
Ct6 lOP
~ Q. ~21A726S • o---J\/V\r---0 0. 6V
, 49
Q
+ C12
t20l< ~ 5V
~12
Q.
R22 75K
r lOOOP
Ctt +
Ct3 27P
R43 4.1 K
C29
o----'\11/'v---
O~ V
R13 1.54K ov o-------IV\I'v-
o-----'\/Vv--0
~
680 c
b lOOOP
R40 120
~ o---JVVv----0 '
~
410p>-l t--o
2.SCI775A
l c1
R,, 220
47~p_3;-ft--o
R2s
~
.t
220/63
~
1C9
c-z2
A
R34 56 C>---1\/V'v---< C?A o-tt-o 0.0047
Ct6 tOP . . .I. Cto o-t ~ 0 GV Q.G J 3500P b3500P o~&b(Q sv • 2SC1775A Rst'o?K Rt5 Q.s ~ • • - 4& sv >Rts > Rts 75K ........, r-v 75K -,. 9101< ,.
o---f:J--<> c
c
~
Czs 221!6 Cts 3.3/50 o-ft-<> o-ft-<> +R36220K + o---J\NI.r---0
~wo':I8~C3t
......!,'f'
R33 56
c
9
~20K~ lc301 ~t90~~BiV( ~
3
f\z9 47
o---J\NI.r---0 o---J\NI.r---0 c25 22/ IG V0.1 2SC1775A O.s 2SA672A
c113.J/SQ
A
B
I
2
AWR-106, No.13 AWG -042, No.10
AWR· 106, No.ll AWG -042, No. 11
AWS-094, No.23
AWS-094, No.29
D
D
1
I
2
~
3 65
Parts List of Equalizer Amplifier Assembly (AWF-021) SEMICONDUCTORS Part No.
Description
Symbol
Part No.
Description
Symbol
1--
01 02 03 04 05
Transistor Transistor Transistor Transistor Transistor
25A7265·G 25A7265-G 25A7265-G 25A7265-G 25C1775A·D
R26 R27 R28 R29 R30
Carbon Carbon Carbon Carbon Carbon
fi.lm film film film film
220 680 680 47 47
RDY.PS RDY.PS RD%P5 RDY.P5 RDY.P5
06 07 08 09 010
Transistor Transistor Transistor Transistor Transistor
2SC1775A·D 25C1775A·D 2SC1775A·D 25A872A·D 25A872A-D
R31 R32 R33 R34 R35
Carbon Carbon Carbon Carbon Carbon
film film film film film
47 47 56 220k
ROY.P5 470J RO%P5 470J RDY.PS 560J RDY.P5 560J RD%P5 224J
011 012 013 014
Transistor Transistor Transistor Transistor
25C1735-D 2SC869·C 25A850·D 25A628A-C
R36 R37 R38 R39 R40
Carbon Carbon Carbon Carbon Carbon
film film film film film
220k 4.7k 47k 47k 120
RDY.P5 RDY.P5 RDY.PS RDY.P5 RDY.P5
01 02 03 04 05
Diode Diode Diode Diode Zener diode
152473 152473 152473 152473 WZ-240
R41 R42 R43 R44 R45
Carbon film Carbon film Carbon film Carbon film Carbon film
51k 47k 4.7k 150 150
ROY.PS 513J RD%P5 473J RDY.P5 472J RD%P5F 151J RDY.P5F 151J
06
Zener diode
R46 R47
Carbon film Carbon film
15k 15k
ROY.PS 153J RO%P5 153J
-
56
221J 681J 681J 470J 470J
224J 472J 473J 473J 121J
WZ-240
RESISTORS Description
Symbol
Part No.
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
100k 100k 1 OOk lOOk 2.2k
RD%P5 RD%PS RD%P5 RD%P5 RD%P5
104JNL 104JNL 104JNL 104JNL 222J
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
2.2k 120k 120k 4.7k 4.7k
RD%P5 RD%P5 . RD%P5 RD%P5 RDY.P5
222J 124JNL 124JNL 472J 472J
R11 R12 R13 R14 R15
Carbon film Carbon film Metal film Metal film Metal film
lk 1k 1.54k 1.54k 75.0k
R16 R17 R18 R19 R20
Metal film Metal film Metal film Carbon film Carbon film
75.0k 910k 910k 220 220
R21 R22 R23 R24 R25
Carbon film Carbon film Carbon film Carbon film Carbon film
75k 75k 39k 39k 220
66
'hW 'hW '!.W 'hW 'hW '!.W
RD%P5 1 02J RD%P5 102J RN'h5R 1541F RN'h5R 1541 F RN'hSR 7502F RN'!.SR 7502F RN'h5R 91 03F RN%5R 9103F RD%P5 221J RDY.PS 221J RD%P5 753JNL RDY.PS 753JNL RD%P5 393J RDY.PS 393J RD%P5 221J
CAPACITORS Part No.
Description
Symbol C1 C2 C3 C4 C5
Metallized mylar 1 Metallized mylar 1 47p Ceramic 47p Ceramic 68p Ceramic
100V 100V 50V 50V 50V
ACE-008 ACE-008 CC05L 470K 50 CCD5L 470K 50 CCD5L 680K 50
C6 C7 C8 C9 C10
Ceramic Polystyrene Polystyrene Polystyrene Polystyrene
68p film 1000p film 1000p film 3500p film 3500p
50V 50V 50V 50V 50V
CCDSL 680K 50 C05A 102F 50 C05A 102F 50 C05A 352F 50 C05A 352F 50
C11 C12 C13 C14 C15
Electrolytic Electrolytic Ceramic Ceramic Ceramic
470 470 27p 27p 10p
6V 6V 50V 50V 50V
CEA471P6 CEA 471P 6 CCD5L 270K 50 CCD5L 270K 50 CCD5L lOOK 50
C16 C17 C18 C19 C20
Ceramic Electrolytic Electrolytic Mylar Mylar
10p 3.3 3.3 0.0018 0.0018
50V 50V 50V 50V 50V
CC05L lOOK 50 CEANL 3R3P 50 CEANL 3R3P 50 COMA 182K 50 COMA 182K 50
C21 C22 C23
Ceramic Ceramic Mylar
470p 470p 0.0047
50V 50V 50V
CKDYB 471 K 50 CKDYB 471 K 50 COMA 472K 50
BX-1250
Symbol
Description 1--
---
Part No.
-
-
C24 C25
Mylar Electrolytic
0.0047 22
50V 16V
CQMA472K 50 CSZA 220M 16
C26 C27 C28 C29 C30
Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic ·
22 220 220 100 22
16V 63V 63V 35V 16V
CSZA 220M 16 CEA 221P 63 CEA 221P 63 CEA 101P 35 CSZA 220M 16
C31 C32
Electrolytic Electrolytic
22 100
16V 35V
CSZA 220M 16 CEA 101 P 35
67
12.8 FUNCTION SWITCH ASSEMBLY (AWS-094) r - - - - -012
'5
~6
100
~------------------~AAr--------------<)
'6
14 ~~----------------------------~------_. 1l 450---------------------------+-+-------~
440------------,--------------~~--~--~
18 o------------"vVv---- 0 26 o-- - - - - . ·s o---------~~~
21
28 230---------~--~-+----~-----+~ 20 0---------~---+~
24
o-------+~rvv-+--1-0
2'7 C>-----... 28 0----~~~~---.~
R 1 J00
31 33
~---------,
34o------' 3So---------------~ 30 u-------------~ 36G-----------------~-
3~ o---------D
3S u----------------o 3 8 o - - - - - - - - - - () 41
o------------~~-+-+~
22 43
4{)
Parts List of Function Switch Assembly (AWS-094) Part No .
Description
Symbo l S1
Push switch (F UNCT ION)
R1 R2 R3 R4 R5 R6
Carbon Carbon Carbon Carbon Carbon Carbon
C1
Electrolyt ic capaci tor
68
film film film f ilm fi lm film
res1stor reSIStor res1stor res1stor res1stor res1stor
ASG-095
100 100 100 100 100 100 220
RD!4PS RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS 6V
101J 101J 101J 101J 10 1J 101J
CEA 221P 6
42
SX-1250 1
2
3
~ PL 8 (AM)
A AWR-106, No.8
A
~ PL 9 (FM)
AWS-095, No.9
c
2 ,.... 4 ,....
1
0 3
@
PL10(PHONO 1)
@)
PLII (PHONO 2)
@
PL 12 (AUX)
0!) 6 0 8 ~
r-
R6 100
10 0 12,....
~
~
0
~
0
~ ~
AUX
B
0
I
0
0 7 u ~ 011 013
15
*'
II
-@ AUX (R) ~'>WG - 042 ,
014
@) AUX (L)
<>----'IN\r---0
Rs 100
/\WF -021, No.7
016
R• 100
017
rr----+AWF-021, No.4
c 19
WX -097, No.7 WF-021 , No.1
~
i..,i
0
i..i
0
~
0
~
0
~
0
~
0
PHONO 2
R3100
~
18
I
20,....
0<::1
022
I § PHONO 1 (L)
~
R2 100
~ ~
0 0
i..i ~
0
0
~
~
I~
0
0
PHO NO 1
024 026
9
027 029
300
c
a...i
0
,11,-i
0
~
0
~
0
i..i
0
~
0
FM
li.....a
0
0
0
-
0
l
33
9
0
i....a
0
.a...i
0
~
0
~
0
~
0
A t-1
I
~34
371
<[36
a
<1 ~tl
39
o_
+ C1
t
220/6
44 0
045
AWG -042, No.28
.1lWE-068, No.34
WE -068, No.35 ~AWR-106, No.9
c
~AWE-068,
No.15 @ PL 13 .li.WE-068, No.7 AWE -068, No.10 AWE -068, No.33
~AWE- 068,
No.37 0\ SIGNAL METER
l
+~
C14
1
--- 100/6 AWE-068, No.17 · /\WE -068, No.22
AWM-089, No.3
AWE-068, No.19
AWG -042, No.26
D
· ~'>WM-089, No.6 ~'>WE -068,
1
WF -021, No.lO
~TUNING METER
."-"
~1--
~
D
AWX-097, No.5
~40
42
L-...
"WF-021, No.6
r-;
C?32
935 i..,i
- @ PHONO 1 (R)
25 v 28
B
r::::WE-068, No.41
~
23
No.18 No.6
~'>WX-097,
2
No.18
3 69
1
2
3
12.9 FLAT AMPLIFIER ASSEMBLY (AWG-042)
.
G;
"'
<>
0
u
"
A
'
T
I
r-----1 Ul C"ll
, -...,II
A
i--l
t""" ,,•
B
B
"'
<• c
,,
> n 10')
"
~
•
I I
<..) (/)
I
C'"r
p .... '"-' <( ~L
c
N
a
"'
I
,~~
'" ;?•
I
c
>'l-
>
''r r N I
._,,
a
i'
,,> ;II tJ~~
·<
'
,, '" "(~ ~
Ill
"~
,'<J J
'"
tl
"'
D
-T:
D
~~~
I
'"
'"
J
.... "' ._,
X
oo
N
G
/
X
<•
"
rt
1 70
2
3
SX-1250 1
I
I
2
I
3
I
4
I
5
6 AWX-062, No.6+--------,
AWR -106, No.10
TAPE 2 REC (R) @ ' - - -...
AWE -068, No.39
AWS·094, No.44 + - - - - - ,
AWR -106, No.14
A
A
TAPE 1 REC (R) @----
AWM-091, No.3 ~ AWG-041, ~
AWX-062, No.1+------.
No.2
AWM -089, No.11
TAPE 1 R EC ( L)@ - t - - - - - - - - - - - . TAPE 2 REC (Ll@ - - - - - - . ,
,----+ AWM·089, No.14
-
AWS·094, No.45 r - -
r--r AWG -041, No.9
TAPE 1 PLAY (L) @ - - - - - - ,
•
AWX·062, No.4+AWS·094,
No.14~
AWX-062, No.3+-----,
TAPE 1 PLAY
ADAPTOR IN (R) @:...____----,.-----;§)ADAPTOR TAPE 2 OUT (L) PLAY (R) ADAPTOR OUT (R) ~ r-.DAPTOR TAPE 2 (Q) .J.,. IN (L) PLAY (L .....__. AWF -021 , No.~ @ ©
B
@ (Rl
B
AWF -021, No.2-----.
8
-
9
12 13
R7 4.71<
1
'lSA872A Q.4 0 GV
2SC1715A
lK
4
<>--M-o
02
!
o
~I
o
152473 • 2 C7 + o---f.l---o
C16 330P
o-U--o 0
o-tt-o
0
0
l[ VR2 50K Rt6 47K
~~ .~,~
SG
0
0
Ci5330P
0
330/63
1 ][ s,
n
Cs
~ 330/63
",
RiB
J ~~K
l.lK
22
20
24
25 26
27 28 29
•
'lSCl775~
'lSA872A Cs Q.:~
ll..1
o27
250
3~~ fi:: :7 ~~ t r~~f fR~s
c
15
1K
a
4703
I~
o
lK RT3 o -. 01 o
IS2473 ~ 2
ff
330K
cr
VR 1 lOOK ( HS)
r-r--1
o23r
Rg
LL, 1l~;:1 1 rI W-1
~~KJ 0
0
0
13 14 15 0
o12
0
0
0
17 18 19 0
0
0
l[ 0
0 0 0 20 21 22
0
0
26 0
0
][ 0
0
t~· lt
0
0
l[
2\3K
I
2
I
3
I
4
][ s,
I
5
I
r·2K
c
28 0
29 0
0
D
1
lR2
0
~ ~ 2~f l [
][ 0
0
R4
2.2K
D
6 72
Parts List of Flat Amplifier Assembly (AWG-042) SEMICONDUCTORS Symbol
Description
--
Part No.
Description
Symbol
Part No.
Q1 Q2 Q3 Q4 Q5
Transistor Transistor Transistor Transistor FET
2SC1775A-E 2SC1775A-E 2SA872A·E 2SA872A-E 2SK30AW·Y
R21 R22 R23 R24 R25
Carbon Carbon Carbon Carbon Carbon
film film film film film
47 47 6.2k 6.2k 47k
RD%PS RD%PS RD%PS RD%PS RD%PS
470J 470J 622J 622J 473JNL
Q6 Q7
as
FET Transistor Transistor
2SK30AW-Y 2SA725-G 2SA725-G
D1 D2 D3 D4
Diode Diode Diode Diode
152473 152473 152473 152473
R26 R27 R28 R29 R30
Carbon Carbon Carbon Carbon Carbon
film fi lm film film film
47k 2.7k 2.7k 820k 820k
RD%PS RD%PS RD%PS RD%PS RD%PS
473JNL 272J 272J 824JNL 824JNL
R31 R32 R33 R34 R35
Carbon Carbon Carbon Carbon Carbon
film film film film film
100 100 130k 130k 1.2k
RD%PS RD%PS RD%PS RD%PS RD%PS
101J 101J 134JNL 134JNL 122J
R36 R37 R38 R39 R40
Carbon Carbon Carbon Carbon Carbon
film film fi lm film film
1.2k 22k 22k 8.2k 8.2k
RD%PS RD%PS RD%PS RD%PS RD%PS
122J 223J 223J 822J 822J
R41 R42 R43 R44 R45
Carbon Carbon Carbon Carbon Carbon
film film film film film
75k 75k 10k 10k 3.9k
RD%PS RD%PS RD%PS RD%PS RD%PS
753JNL 753JNL 1 03J 103J 392J
R46 R47 R48
Carbon film Carbon film Carbon film
3.9k 22k 22k
RD%PS 392J RD%PS 223J RD%PS 223J
I
SWITCHES Symbol 51 52 53
Description
55
Lever Lever Lever Lever Lever
S6 57
Lever switch (MUTING) Lever switch (LOUDNESS)
S4
switch switch switch switch switch
(DUPLICATE) (MONITOR 1) (MONITOR 2) (ADAPTOR) (MODE)
Part No.
.
ASK-084 ASK-092 ASK-092 ASK-092 ASK-090 ASK-090 ASK-090
RESISTORS Symbol
Description
VR1 VR2
Variable ( 1OOk·HB BALANCE) Variable (50k-B2 VOLUME)
ACV-163 ACV·169
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
2.2k 2.2k 2.2k 2.2k 2.2k
RD%PS RD%PS RD%PS RD%PS RD%PS
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
2.2k 4.7k 4.7k 330k 330k
RD%PS 222J RD%PS 472J RD%PS 472J RD%PS 334JNL RD%PS 334JNL
R11 R12 R13 R14 R15
Carbon Carbon Carbon Carbon Carbon
film film film film film
330k 330k 1k 1k 1k
RD%PS RD%PS RD%PS RD%PS RD%PS
R16 R17 R18 R19 R20
Carbon film Carbon film Carbon film Carbon film Carbon film
1k 1.1 k 1.1 k 47 47
RD%PS 102J RD%PS 112J RD%PS 112J RD%PS470J RD%PS470J
73
Part No.
222J 222J 222J 222J 222J
334JNL 334JNL 102J 102J 102J
CAPACITORS Symbol
Description
C1 C2 C3 C4 C5
Metallized Metallized Metallized Metallized Ceramic
C6 C7 C8 C9 C10
mylar mylar mylar mylar
Part No.
1 1 1 1 0.01
100V 100V 100V 100V 500V
ACE-008 ACE-008 ACE-008 ACE-008 CKDYF 1032 500
Ceramic Electrolytic Electrolytic Electrolytic Electrolytic
0.01 330 330 22 22
500V 63V 63V 16V 16V
CKDYF 1032 500 CEA 331P 63 CEA 331 P 63 CS2A 220M 16 CS2A 220M 16
C11 C12 C13 C14 C15
Electrolytic Electrolytic Mylar Mylar Ceramic
22 22 0.22 0.22 330R
16V 16V 50V 50V 50V
CS2A 220M 16 CS2A 220M 16 CQMA 224J 50 COMA 224J 50 CKDYB 331 K 50
C16 C17
33()p Ceramic Metallized mylar 1
50V 100V
CKDYB 331 K 50 ACE-008
Symbol f-- C18 C19 C20
Description
Part No.
Metallized mylar 1 56p Ceramic 56p Ceramic
100V 50V 50V
ACE-008 CCDSL 560K 50 CCDSL 560K 50
C21 C22 C23 C24 C25
Electrolytic Electrolytic Ceramic Ceramic Ceramic
100 100 68p 68p 10p
10V 10V 50V 50V 50V
CEANL 101P 10 CEANL 101P 10 CCDSL 680K 50 CCDSL 680K 50 CCDSL 1 OOF 50
C26 C27 C28 C29 C30
Ceramic Electrolytic Electrolytic Ceramic Ceramic
1()p 220 220 0 .04 0.04
50V 16V 16V 50V 50V
CCDSL 100F 50 CEANL 221 P 16 CEANL 221 P 16 CKDYF 403Z 50 CKDYF 403Z 50
C31 C32
Electrolytic Electrolytic
330 330
35V 35V
CEA 331P 35 CEA 331P 35
OTHERS Symbol
Description Screw Union nut Washer faced nut
74
.
Part No . ABA-116 ABN-021 ABN-024
SX-1250 12.10 5P CONNECTOR ASSEMBLY (AWX-062)
L REG
::s::
::s:: 0 9.., a:
I
_j
I
L_ 6 R I<EC
~
0
Ro 390K
0 ~ )3 lOOK ......, 'I
CJ
I
0
I
I\)
,J.
\ 0,... \ ~ 0
'o....
-o- ,
0
I ~ 10"
R•lOOI\
0~
~(J)
5 4 R PB E
AWG-042, No.24
1
-
2
~ ...,
TAPE 2 REC (L) AWG-042, No.17
1
@ TAPE 2 PLAY (L)
l
@ TAPE 2 PLAY (R)
r
§) TAPE 2 REC (R)
AWG-042, No.19
~
~ on. R2 3901<.
AWG-042, No.29
Parts List of 5P Connector Assembly (AWX-062) Symbol R1 R2 R3 R4
Description Carbon Carbon Carbon Carbon
folm film folm film
resistor resistor resistor resistor
Part No. 390k 390k 100k 100k
Connector socket 5p (REC/PLAY)
RDY.PS ROY.PS RDY.PS RDY.PS
394J 394J 104J 104J
AKP-007
75
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m
ro
(")
0
l> ~
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....
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....
0
Q1 2SC1312
C4s
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·
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4.'7 /25
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~
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VRJ-b
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c44 >-
33K c4
10/25 ... +
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u~
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Cr;
"'' " N
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0 056
rl' -""" 1 . ::!. R4
I I
02.6 K
0.018
'<
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:::.:: ~ ~
g "'
R29 11 K ~
"'
l.SV C3s
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R45 1K
4'7K C46
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-
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r
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R10
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vR4 -b
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;3
co
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R22 1 24K
11K
g
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oc °- (~4Q.Q18
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0
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0
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01
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r
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R43
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2 2K
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n•- :._
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0.018
cfs>( Rz3 11K
~,.
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c...-
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R41
::; ~
C23
2 2/~
C23 124K
C21
Y'
•221 25 01 ~' ~
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13V
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I
24K'I
c," - 1-'i
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2
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0
Parts List of Control Amplifier Assembly (AWG-041) SEMICONDUCTORS Symbol 01 02 03 04
Desc.ription
Part No.
Transistor Transistor Transistor Transistor
2SC 1312-G 2SC 1312-G 2SC 1312-G 2SC1312-G
RESISTORS AND POTENTIOMETERS Symbol VR1 VR2 VR3 VR4
Description
Part No.
Variable res istor (1 02k, 5·step, BASS 50Hz) Variable resistor ( 102.6k, 11 -step, BASS 1OOHz) Variable resistor (1 02k, 5-step, TREBLE 20kHz)
ACV- 165 ACV-166 ACV-168
Variabl e r esistor (99k, 11 -step, TREBLE 1OkHz)
ACV- 167
R1 R2 R3 R4 R5
Carbo n Carbon Carbon Carbon Carbon
film f ilm film film f ilm
lOOk lOOk 47k 47k 33k
RDY.PS RDY.PS RDY..PS RDY.PS RDY.PS
104J 104J 4 73J 473J 333J
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film fil m film
33k 8.2k 8 .2k 47k 47k
RDY.PS R DY.PS RDY.PS RDY.PS RDY.PS
333J 822J 822J 473J 473J
R11 R12 R13 R14 R15
Carbon Carbo n Carbon Carbon Carbon
film film film film film
33k 33k 100k 100k 220k
RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS
333J 333J 104JNL 104JNL 224JN L
R 16 R 17 R18 R19 R20
Carbon Carbon Carbon Carbon Carbon
film film film film film
220k 4.7k 4.7k 6.8k 6.8k
RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS
224JNL 472J 472J 682J 682J
R21 R22 R23 R24 R25
Carbo n Carbon Carbon Carbon Carbon
film f ilm film film tilm
24k 24k 11 k 11 k 10k
RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS
243J 243J 113J 113J 103J
R26 R27 R28 R29 R30
Carbon Carbon Carbon Ca rbon Carbon
film film fi lm f ilm film
10k 24k 24k 11 k 11 k
RDY.PS RDY.PS RDY.PS RDY.PS RDY. PS
103J 243J 243J 11 3J 113J
R31 R32 R33
Carbon film Carbon film Carbon film
l OOk 100k 220k
RDY.PS 104JNL RDY.PS 104JN L RDY.PS 224JN L
78
-
Symbol
Description
Part No.
R34 R35
Carbon film Carbon film
220k 4.7k
RD Y.PS 224JNL R DY.. PS 472J
R36 R37 R38 R39 R40
Carbon Carbon Carbon Carbon Carbon
film f ilm film film f ilm
4.7k 6.8k 6.8k l OOk lOO k
RDY.PS RD Y.PS RDY. PS RDY. PS RDY.PS
472J 682J 682J 104J 104J
R41 R42 R43 R44 R45
Carbon Carbon Carbon Carbon Carbon
fi lm film film f ilm film
2.2k 2.2k 2.2k 2.2k 1k
RDY.PS RDY.PS RDY.PS RDY. PS RDY.PS
222J 222J 222J 222J 102J
R46
Carbon film
1k
RDY.PS 102J
CAPACITORS Symbol
Description
Part No.
Cl C2 C3 C4 C5
Electrolytic Electrolytic Electrolytic Electrolytic Mylar
4 .7 4.7 4 .7 4.7 0.056
25V 25V 25V 25V 50V
CSZA 4R7M CSZA 4R7M CSZA 4R7M CSZA 4R7M COMA 563J
C6 C7 C8 C9 C10
Mylar Mylar Mylar Polystyrene Polystyrene
0.056 0.056 0 .056 390p 390p
50V 50V 50V 50V 50V
COMA 563J 50 COMA 563J 50 COMA 563J 50 COSA 391J 50 COSA 39 1J 50
C1 1 C12 C13 C14 C15
Electrolyt ic Electrolytic Electrolytic Electrolytic Cerarylic
2.2 2.2 2.2 2.2 12p
25V 25V 25V 25V 50V
CEAN L 2R2P CEANL 2R2P CEAN L 2R2P C EANL 2R2P CCDSL 120K
C16 C17 C18 C19 C20
Ceram ic Electrolytic Electrolytic Electrolytic Electro lyt ic
12p 100 100 2.2 2.2
50V 10V 10V 25V 25V
CCDSL 120K 50 ACH -3 12 ACH -3 12 CEAN L 2R2P 25 CEANL 2R2P 25
C21 C22 C23 C24 C25
My lar Mylar My lar Mylar Ceramic
0.0 18 0.018 0.018 0.018 2200p
50V 50V 50V 50V 50V
COMA 183J 50 COMA 183J 50 COMA 183J 50 COMA 183J 50 CKDY A 222J 50
C26 C27 C28 C29 C30
Ceramic Electrolytic Electrolytic Electrolytic Electrolytic
2200p 2.2 2.2 2.2 2.2
50V 25V 25V 25V 25V
CKDY A 222J 50 CEAN L 2R2P 25 CEAN L 2R2P 25 CEAN L 2R2P 25 CEANL 2R2P 25
25 25 25 25 50
25 25 25 25 50
SX-1250
Symbol
Part No.
Description
C31 C32 C33 C34 C35
Ceramic Ceramic Electrolytic Electrolytic Electrolytic
12p 12p 100 100 2.2
50V 50V 10V 10V 25V
CCDSL 120K 50 CCDSL 120K 50 ACH-312 ACH ·312 CEAN L 2R2P 25
C36 C37 C38 C39 C40
Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic
2.2 100 100 100 100
25V 16V 16V 16V 16V
CEANL 2R2P 25 ACH ·31 1 ACH·31 1 ACH-311 ACH-311
C41 C42 C43 C44 C45
Ceramic Ceramic Electrolytic Electrolytic Mylar
470p 470p 10 10 0.068
50V 50V 25V 25V 50V
CKDYB471K50 CKDYB471K50 CSZA 100M 25 CSZA 100M 25 COMA 683J 50
C46
Mylar
0.068
50V
COMA 683J 50
OTHERS Symbol
Description Lever switch (TON E) Washer faced nut
Part No. ASK-090 ABN·024
79
2
1
3
12.12 FILTER AMPLIFIER ASSEMBLY (AWM-089)
A
A
MUTOUT
2
'7
3
4
5
MUT
IN
13
~------~----~~D T 8 I
11_) - - - - - {
25V 14
10 Output
B
L
B
3
G 15 I
11
-B 12 -2.5V
17
c
8 Output
c
R
Input 16 R J-o Cs
L_O I c'l
I
-~ TRANSISTORS
SWITCHS LOW FILTER sl HIGH FILTER Sz MULTI PATH FM MUTI NG
Ql , Gz
s3 s4
D
1 so
I
2.SC1313 x2 ( 2SC1345 ) D
2
3
SX-1250
I
1
I
2
3
I A
A
-
. - - - - - - - - - - - - - - - - - - - - + = =: ; - - - - - +AWE -068, No.38 1
!
3
o--
lr-- f- - - - - + AWE-068, No.14
O2
.------+ AWS-094, No.42 1 --l!---1 AWE-068, No.40
,..,4
J
5 o-- - t- - - '1
D---+----' ,----~
,-----+ AWS-094, No.40 6 o--t----'1 7 '"'0-- --l- - - - - + AWE-068, No.36
B
l.
8
~~•• _ 4.7K_.
~~'}~
Rev{~ ~ 9
---vv ~
'J.
Q.,
G.
R\6
Ri!
o ~
9 2.1K
J.
sv
.
~ PRE OUT (L)
10 2
0,_;.1..1-t-----'''-+ :. . AWG -042, No.5
30K
12 o---t-- - - - - + AWG -041 , No.7
~1 4.;.!.._+-------+AWG-042, No.4 o
~
o
~
---R-lK
~ ~ I ...., 0
o -
~
0
-
PRE OUT (R)
13 '"'o-- -t-- - - - - + AWG -041, No.4
~
c
~ ~
-
B
09
R.&:lO~
-
A WE -068, No.42
,...,
~'o l K
0
....,
_
0 0
~
S1
t
Rl41
1M
15
51K
C1'! 1f0/2R5
R
~~r
sfK,..,
I ,'If ~fif;1fR1 ,,
•oo•f
1 l c, f!~~ I~; To
0..:..;:;._-f----,....1-
16
"''
o--=-+----~ AWG - 041,
No.5
c
:o-:-= :-!- - - - - - - + AWG -041 , No.6
•oo•
1 <>---ANV----0
R~ 3 0K
R1 4 70K
D
D
1
I
2
I
3 8 1
Parts List of Filter Amplifier Assembly (AWM-089) SEMICONDUCTORS Symbol
Oeser ipt ion
01
Transistor
02
Transistor
Part No. 2SC1313-G (2SC1345·DI 2SC1313-G (2SC 1345-Dl
SWITCHES Oeser ipt ion
Symbol S1-4
Push switch
--
(LOW FILTER, HI G H Fl L TER, MULTI PATH, FM MUTING)
Part No.
ASG-098
RESISTORS Symbol
Descript ion
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film f il m fi lm
470k 100k 5. 1 k 4.7k 2 .2k
R6 R7 RB R9 R10
Carbon Carbon Carbon Carbon Carbon
f ilm film film f il m film
R11 R12 R13 R14 R15
Carbon Carbon Carbo n Carbon Carbon
R16 R17 R18 R19 R20
Carbon Carbon Carbon Carbon Carbon
R2 1 R22
Carbon film Carbon film
Part No. RDY.PS RDY.PS RDY.PS RDY. PS RDY.PS
4 74J 104JNL 5 12J 472J 222J
1M 1M 30k 30k 1k
RD'!.PS RD'!.PS RD'!.PS RD'!.PS RDY.PS
105J 105J 303J 303J 102J
f il m film film film film
220k 470k 100k 5.1 k 4.7k
RD'!.PS RDY.PS RD'!.PS RD'!.PS RD'!.PS
224J 474J 104JNL 5 12J 472J
f il m f ilm fi lm f ilm film
2.2k 1M 1M 30k 1k
RD'!.PS RD'!.PS RD'!.PS RD'!.PS RD '!. PS
222J 105J 105J 303J 102J
30k 220k
RD'!.PS 303J RD'!. PS 224J
-
CAPACITORS Symbol
Description
Part No.
C1 C2 C3 C4 C5
Mylar My lar Electrolytic Ceramic Ceramic
0.1 0 .1 4.7 5600p 2700p
50V 50V 25V 50V 50V
COMA 104J 50 COMA 104J 50 CSZA 4 R7M 25 CKDY A 562J 50 CKDY A 272J 50
C6 C7
Electro ly tic My lar
10 0.1
25V 50V
CSZA 100M 25 COMA 10 4J 50
82
Symbol
D escription
Part No.
CB C9 C10
Mylar Electrolyt ic Ceramic
0.1 4.7 5600.,
50V 25V 50V
COMA 104J 50 CSZA 4R7M 25 CKDY A 562J 50
C11 C12
Ceram ic Electrolyt ic
2700p 10
50V 25V
CKDY A 272J 50 CSZA 100M 25
SX-1250 12.13 MICROPHONE JACK ASSEMBLY (AWX-097) 1 -~
.--------------------06
., 3
_ _ _ _ jI 2
1 00047 1
,. Dr
•
I
0
0 0
1r t
Rl lBOK
1
~
[f"
R3 33K
R2
0
r
b
•
0
Cl 0.0047
1.
r
C4 0.0027
@ PHONO 2 (R)
().2
@ PHONO 2 (L)
~
03
·po4
1,,
180K
o-H-..,
Rs 180K
().1
().4 ...,
Jr.
().5
t" t" 33 K
180K
AWS -094, No.2 7 AWS-094, No.18
"'
n6
07
AWS-094, No.21
Parts List of Microphone Jack Assembly (AWX-097) CAPACITORS
Oeser iption
Symbo l
Part No .
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film f ilm film film
180k 180k 39k 39k 180k
RDY.PS RDY.PS RDY.PS RDY.PS RDY.PS
R6
Carbon fil m
180k
RDY.PS 184JNL
Mylar Mylar Mylar Mylar Ceramic
C1 C2 C3 C4 C5
184J NL 184JNL 393JNL 393JN L 184JNL
Part No.
Description
Symbo l
RESISTORS
4700p 4700p 2700p 2700p 0.04
50V 50V 50V 50V 50V
COMA 472J 50 COMA 472J 50 COMA 272J 50 COMA 272J 50 CKDYF 403Z 50
OTHER Symbol
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Description Phone j ack ( M I C)
Part No. AKN-013
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A
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3 85
Parts List of Power Amplifier Assembly (AWH-048) SEMICONDUCTORS Symbol
Description
Part No.
01 02 03 04 05
Transistor Transistor Transistor Transistor Transistor
2SA750-E 2SA750-E 2SC1439-B 2SC1439-B 2SA858-B
06 08 09 010
Transistor Transistor Transistor Transistor Transistor
2SA858-B 2SC1904A·B 2SA899A-B 2SD61 0-R 2SB630· R
011
Transistor
2SC869-C
D1 D2 D3
V aristor Varistor Diode
D4
Diode
STV-3H STV-3H 151886 (SIB01 ·02) 1S1886 (SIB01-02)
D5 D6
Diode Diode
D7
Diode
DB D9 D10
Diode Diode Diode
D11
Diode
Q7
152473 1S1886 (51801-02) 1S1886 (SIB01 ·02)
-
152471 152471 151886 (SIB01-02) 151886 (SIB01-02)
Description
Part No. -
86
Description
Part No.
R19 R20
Carbon film Carbon film
47 620
RD%PS 470J RD%PSF 621J
R21 R22 R23 R24 R25
Carbon film Carbon film Carbon film Metal oxide Metal oxide
100 100 10k 100 100
RD%PSF 101J RD%PSF 101J RD%PS 103J RS1PF 101J RS1PF 101J
R26 R27 R28 R29 R30
Metal oxide Metal oxide Wire wound Wire wound Carbon film
1k 1k 0.5 0.5 22
R31 R32 R33 R34 R35
Carbon film Wire sound Wire wound Carbon film Carbon film
22 0.5 0.5 22 22
R36 R37 R38 R39 R40
Metal film Metal film Metal oxide Metal oxide Carbon film
4.7 4.7 10 10 1.2k
R41 R42 R43
Carbon film Carbon film Carbon film
1.2k 13k 13k
Semi-fixed Semi·fixed
470-B 470-B
VR1 VR2
1W 1W 1W 1W 5W 5W
I I
RS1PF 102J RS1PF 102J RT5B OR5K RT5B OR5K RD%PSF 220J RD%PSF 220J RT5B OR5K RT5B OR5K RD%PSF 220J RD%PSF 220J
5W 5W
1W 1W 2W 2W
RN1H 4R7K RN1H 4R7K RS2P 100J RS2P 100J RD%PSF 122J I
RD%PSF 122J RD%PS 133J RD%PS 133J A-033 A-033
CAPACITORS
RESISTORS Symbol
Symbol
-
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
3.3k 220k 82 47k 47k
---1 RD%PS 332J RD%PS 224JNL RD%PS 820J RD%PS 473JN L RD%PS 473JNL
R6 R7 RB R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
82 62k 200k 100 100
RD%PS RD%PS RD%PS RD%PS RD%PS
R11 R12 R13 R14 R15
Carbon Carbon Carbon Carbon Carbon
film film film film film
16k 16k 1.5k 62k 220
RD%PS 163J RD%PS 163J RD%PS 152J RD%PS 623JNL RD%PSF 221J
R16 R17 R18
Carbon film Carbon film Carbon film
220 1k 47
RD%PSF 221J RD%PSF 102J RD%PS 470J
820J 623JNL 204JNL 101J 101J
Symbol -
Description
Part No.
f--
C1 C2 C3 C4 C5
Metallized mylar 1 Electrolytic 10 47p Ceramic Ceramic 120p Electrolytic 220
100V 16V 50V 50V 16V
ACE-008 CEANL lOOP CCDSL 470K CCDSL 121 K CEANL 221P
Ceramic Ceramic Mylar Ceramic Ceramic
4 7p 10p 0.1 47p 47p
500V 500V 50V 500V 500V
CCDSL 470K 500 CCDSL tOOK 500 COMA 104J 50 CCDSL 470K 5€10 CCDSL 4 70K 500
C11 C12 C13 C14 C15
Electrolytic Mylar Ceramic Ceramic Electrolytic
0.22 0.039 0 .047 0.047 470
10V 250V 150V 150V 80V
CSZA A 22M ·10 COMA 393J 250 ACG-009 ACG-009 ACH-038
C16 C17 C18
Electrolytic Ceramic Ceramic
470 0.047 0.047
80V 150V 150V
ACH-038 ACG-009 ACG-009
C6 C7 CB C9 C10
I
16 50 50 16
SX-1250
OTHERS Symbol
Description
Part No.
L1
.
Heat sink AF choke coil 2.2SJ H Transistor socket Insulator wafer strip (3p, L-type)
ANH-237 T63-009 AKH-002 AEC-088 AKM-024
strip (4p) strip (3p)
AKM-034 AKM-033
87
12.15 SPEAKERS SWITCH ASSEMBLY (AWS-095)
ON
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Parts list of Speakers Switch Assembly (AWS-095) Symbol
Description
Part No.
S1
Push swi tch (SPEAKERS)
Rl R2
Metal oxide resistor Metal oxide resistor
J1
Phone jack (PHON ESl
BB
150 150
ASG -094 3W 3W
RS3P 151K RS3P 151K AKN-010
4
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VLT
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AWR-106, No.11 +-------. AWH -048, No.3 + - - - - . AWF -021, No.8 +------'
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SX-1250 Parts list of Protection Circuit Assembly (AWM-091) SEMICONDUCTORS
CAPACITORS
Symbol f-01
Transistor
02
Transistor
Q3
Transistor
04
Transistor
05
Transistor
06
Transistor
Dl D2 D3 D4 D5
Diode Diode Diode Diode Diode
152473 1S2473 1S2471 1S2473 1S2473
Diode Diode
S5151R S5151
D6 D7
Description
I
I
Part No. 2SC945A·O (2SC1647-P) 2SC945A-0 (2SC1647-P) 2SA733·0 2SC945A-0 (2SC1647-P) 2SC1166-Y (2SC 1384-0) 2SC1166-Y (2SC1384-0)
-
Symbol
I
Description
Part No.
1-
f-
-
C1 C2 C3 C4 C5
Electrolytic Electrolytic Electrolytic Electroly t ic Electrolytic
470 470 4.7 100 100
6V 6V 25V 16V 50V
CEA471P6 CEA 471P 6 CEA 4R7P 25 CEA101P16 CEA101P50
C6 C7 C8 C9 C10
Electrolytic Ceramic Ceramic Ceramic Ceramic
100 100p O.Q1 0.01 0.01
50V 50V 150V 150V 150V
CEA101P50 CCDSL 101 K 50 ACG-004 ACG-004 ACG-004
C1 1
Ceramic
0.01
150V
ACG-004
OTHERS Symbol Sl
Description Relay strip (3p, L-type) strip (5p, L -type)
Part No. ASR-0 10 AKM-024 AKM-025
RESISTORS Symbol
Description
Part No.
R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
75k 75k 2.2k 82 82
R DY..PS RDY..PS RDY..PS RDY..PS RDY..PS
753J 753J 222J 820J 820J
R6 R7 R8 R9 R10
Carbon Carbon Carbon Carbon Carbon
film film film film film
10k 15k 15k 2.2k 150k
RDY..PS RDY..PS RDY..PS RDY..PS RDY..PS
103J 153J 153J 222J 154J
R11 R12 R13 R14 R15
Carbon Carbon Carbon Carbon Carbon
film film film f ilm film
15k 15k 68k 9 1k 12k
RDY..PS RDY..PS RDY..PS RDY..PS RDY..PS
153J 153J 683J 913J 123J
R16 R17 R18 R1 9 R20
Carbon film Carbon film Carbon film Carbon film Metal oxide
68k 22 15k 2.2k 220
RDY..PS 683J RDY..PS 220J RDY..PS 153J RDY..PS 222J RS1P211J
R21 R22 R23 R24 R25
Carbon film Carbon film Metal oxide Metal oxide Metal oxide
5.6k 6.8k 680 3.3k 3.3k
I
I
1W
2W 3W 3W
RDY..PS 562J RDY..PS 682J RS2P 681J RS3P 332K RS3P 332K
92
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12.17 STABILIZER ASSEMBLY (AWR-106)
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SX-1250 Parts List of Stabilizer Assembly (AWR-1 06) SEMICONDUCTORS Symbol
Description
Part No.
Symbol
Description
P;ort No.
1--Transistor Tra nsistor Transistor Transistor Transistor
2S D313P-E 2SC869-D 2SC1318-R 2SC1384-R 2SB507P-E
08 09 010
Transistor Transistor Transistor Transistor Transistor
2SA628A-D 2SA720-R 2SA684A·R 2SD325R·E 2SC945A-R
011 012 013
Transistor Transistor Transistor
D1 D2 03 D4 D5
Zener diode Diode Zener diode Diode Zener diode
D6 D7 DB
Diode Diode Diode
01
02 03 04 05 06 Q7
-
Symbol R1 R2 R3 R4 R5
Carbon Carbon Carbon Carbon Carbon
film film film film film
2.7k 2.7k 2.7k 2.7k 8.2k
R6 R7 RB R9 R10
Carbon film Carbon film Carbon film Carbon film Carbon film
8.2k 1k 1k 22k 22k
R11 R12 R13 R14 R15
Carbon film Carbon film Metal oxide Metal oxide Metal oxide
16k 16k 680 1.5k 3.3k
R16 R17 R18 R19 R20
Metal oxide Carbon film Metal oxide Carbon film Carbon film
3.3k 3.9 100 1.5k 1.5k
R21 R22 R23
Carbon film Carbon film Carbon film
1k 1k 1k
I
3W 3W 'h.W 2W
RDY.PS 162J RDY.PS 152J
VR1 VR2
Semi-fixed Semi-fixed
4.7k-B 4 .7k-B
A-034 A-034
CAPACITORS Symbol
Description
Part No.
2SC945A·R 2SD325R-E 2SC945A·R
220 220 82p 82p 47
BOV BOV 500V 500V 35V
CEA 221P 80 CEA 221 P 80 CCDSL 820K 500 CCDSL 820K 500 CEA 470P 35
WZ-240 1S2473 WZ-240 1S2473 WZ-061
C6 C7 CB C9 C10 .
Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic
47 22 22 100 100
35V 50V 50V 35V 35V
CEA 470P 35 CEA 220P 50 CEA 220P 50 CEA 101P 35 CEA 101P35
1S2473 S5151R S5151
C11 C12 C13 C14 C15
Electrolytic Electrolytic Electrolytic Ceramic Electrolytic
47 47 1000 82p 47
BOV BOV 25V 50V 10V
CEA470P 80 CEA470P 80 CEB 102P 25 CCDSL 820K 50 CEA470P 10
C16 C17 C18 C19 C20
Electrolytic Electrolytic Electrolytic Electrolytic Ceramic
22 220 47 47 0.01
10V 16V 10V 10V 150V
CEA 220P CEA 221P CEA 470P CEA 470P ACG-004
C21 C22 C23
Ceramic Ceramic Ceramic
O.Ql 0.01 0.01
150V 150V 150V
ACG-004 ACG-004 ACG-004
RDY.PSF 272J RDY.PSF 272J RDY.PS 272J .RDY.PS 272J RDY.PS 822J RDY.PS RDY. PS RDY.PS RDY.PS RDY.PS
2W 2W
1.6k 1.5k
Electrolytic Electrolytic Ceramic Ceramic Electrolytic
Part No.
Description
Carbon film Carbon film
C1 C2 C3 C4 C5
RESISTORS
- - - 1--
R24 R25
822J 102J 102J 223J 223J
RDY.PS 163J RDY.PS 163J RS2P 681 K RS2P 152K RS3P 332K RS3P 332K RD'h.PSF 3R9J RS2P 101 K RDY.PS 152J RDY.PS 152J
10 16 10 10
OTHERS Description
Symbol
J--- - + - -
l
Part No.
Heat sink Heat sink Transistor socket Insulator wafer strip (3p, L -type)
ANH -237 ANH -300 AKH-002 ACE-088 AKM -024
strip (5p, L-type)
AKM-025
RDY.PS 102J RDY.PS 102J RDY.PS 102J
95
12.18 POWER SUPPLY ASSEMBLY (AWR-107)
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Parts List of Power Supply Assembly (AWR-1 07) SEMICONDUCTORS Symbol
CAPACITORS
I
Description
-
D1 D2 D3 D4 D5
Diode Diode Diode Diode Diode
SIBOl-04 SIBOl-04 SIBOl-04 SIB01-04 SIBOl-01 (1S1885)
D6
Diode
SIBOl-01 (1S1885)
I
Symbol
Part No.
Description
t-
R1 R2 R3 R4
Description
0.01 0.01 0.01 0.01 0.01
250V 250V 250V 250V 150V
CG-001 ACG-001 ACG-001 ACG-001 ACG-004
C6 C7
Electrolytic Electrolytic Electrolytic Electrolytic Ceramic
470 470 470 470 0.01
100V 100V 25V 25V 150V
CEB 471 P 100 CEB471P100 CEA 471P 25 CEA 471 P 25 ACG-004
cs C9 C10
Wire wound Metal oxide Metal oxide Metal oxide
3.3 2.2K 10 10
Part No. 20W 2W 2W 2W
ACN·003 RS2P 222J RS2P 100K RS2P lOOK
OTHERS Symbol
I
I
96
PartNo.
Ceramic Ceramic Ceramic Ceramic Ceramic
RESISTORS Symbol
~~
C1 C2 C3 C4 C5
Description
Part No.
Fuse clip Fuse clip
AKR-013 AKR-030
MICROTEMP
AEX-005
-
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AWR -106, No.7 AWR -106, No.6 '-----~AW R -106,
No. 15
c
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GRN BRN
OR
BLU
..._----~AWX -096 , '----~ AWM-09 1 ,
No.2
AC 120V 60Hz
No.2
D
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1
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3 97
13. PACKING
Side pad L AHA-107
Sheet AHG-037
Operating instructions ARB-164 .
FM T-type antenna ADH -002 Hexagonal wrench ANK-018
<J
1nside packing AHC-026
Packing case AHD-341 (English) AHD-342 (English/ French)
98
SX-1250
14. PARTS LIST OF EXPLODED VIEWS Parts No.
Parts Name
Parts No.
Parts Name
AAA-034 AAB-100 AAB-104 AAD-113 AAD- 114
Knob Knob Knob Knob Knob
ApX-038 ADX-039 AEB-085 AEB-086 AEB-087
Cable Housing Cable Housing Rubber Bracket A Rubber Bracket B Rubber Spacer
AAF-051 AAG·106 AAP-037 AAT-025 AAT-026
Dial Pointer Dial Scale Plate Blind Sash Shaft Cover Ind icator
AEC-076 AEC-079 AEC- 101 AEC-15 1 AEC- 178
Insu lator Wafer Strain Rei ief Pulley Wire er Foot
AAT-027 AAT-028 AAW-040 ABA-002 ABA-012
Indicator Indicator Double Meter Screw Screw
AEC-256 AEC-258 AEC-272 AED-0 18 AEK-104
Pulley Spacer Acrylic Board Mask Fuse (1 .5A) (KCU, S)
ABA-081 ABA-087 ABA-1 13 ABA-114 ABA-116
Screw Screw Screw Pulley Shaft Screw
AEK-106 AEK-109 AEK-301 AEK-402 AEK-404
Fuse Fuse Fuse Fuse Fuse
Screw Screw Washer Washer Coil Spri ng
AEK-405 AEL-056 AEL-069 AEL-072 AEL-073
Fuse (1.6A) (HG) Lamp Ass Lamp L amp Lamp
ABN-021 ABN-022 ABN-023 ABN-024 ACG-001
Nut Base Washer Faced Nut Washer Faced Nut Capacitor (HG, S)
AEL-074 AEL-075 AEL-076 AHA-107 AHA-108
Lamp Lamp Lamp Side Pad L Side Pad R
ACG-003 ACH-056 ACV-163 ACV- 165 ACV-166
Capacitor (KCU) Capacitor Variable Resistor Variable Resistor Variable Resistor
AHC-026 AHD-341 A HD-342 AHG-037 AKA-004
Inner Packing Packing Case (KU, S, HG) Packing Case (KC) Sheet Terminal
ACV-167 ACV-168 ACV-169 ADG-013 ADG-015
Variable Resistor Variable Resistor Variable Resistor AC Power Cord (KCU) AC Power Cord (S)
AKB-019 AKB-030 AKB-033 AKC-030 AKC-038
Terminal Ter minal Terminal Terminal Strip 2P Terminal Strip 2P
ADH-002 ADX-029 ADX-030 ADX-031 ADX-032
FM Antenna Cable Housing Cable Housing Cable Housing Cable Housing
AKE-01 2 AKE-014 AKF-053 AKH-001 AKN-010
Terminal Terminal Connecting Plate Transistor Socket Phone Jack
ADX-033 ADX-034 ADX-035 ADX-036 ADX-037
Cable Cable Cable Cable Cable
AKN-013 AKP-005 AKP-007 AKP-008 AKR-028
Phone Jack AC Socket (KCU, S) 5P Connector Socket AC Socket (HG) Fuse Ho lder 1P
ABA-123 ABA-129 ABE-006 ABE-018 ABH -022
.
Housing Housing Housing Housing Housing
I
(1A) (KCU, S) (6A) (S) (12Al (KCU , S) (1A) (HG) (6.3A) (HG)
99
Parts No. AKR-031 AKX-031 AMM-049 ANB-386 ANE-105 ANK-018 ARB-164 ARB-168 ARB-171 ARD-089
-- --
...
Parts Name Plug in Selector Plug in Selector Wooden Cover Front Ass Top Hexagonal Wrench Operating In struction Operating Instruction Operating lnstructton Operating I nstructton
ASG-094 ASG-095 ASG-098 ASH-015 ASK-080
Push Switch Push Switch Push Switch Slide Switch Power Switch (KCU)
ASK-084 ASK-090 ASK-092 ASK-099 ASK-105
Lever Switch Lever Switch Lever Switch Power Switch (S) Power Switch (HGI
ASR-015 A TB-051 ATT-267 ATT-291 ATT-295
Relay · Ferrite Bar Antenna Power Trans (KCU) Power Trans (S) Power Trans (HF)
AWB-023 AWE-068 AWF-021 AWG-041 AWG-042
FM Front End Tuner Ass EO Amp Ass Control Amp Ass Flat Amp Ass
AWH-048 AWM-089 AWM-091 AWR-106 AWR-107
Power Amp Ass Filter Amp Ass Protection Ass Stabi l izer Ass Power Supply Ass
AWR-108 AWS-094 AWS-095 AWS-098 AWX-062
Power Supply Ass Function Switch Ass Speaker Switch Ass Speaker Switch Ass 5P Connector Ass
AWX-096 AWX-097 AWX-099 AWX-100 AXA-070
Lamp Board Ass Mic Jack Ass Switch Ass (KCU) Switch Ass (S) Tuning Drum A ss
AXA-111 871-004 871-010 M45-086 T22-025
Tuntng Shaft Ass Nut Nut Washer Ferrite Balun
100
-
Parts No. W72-092 2SD555-R 2SB600R
--
Parts Name Bar Antenna Holder Transist or Transistor
SX-'1250
15. SUPPLEMENTS FOR SX-1250/HG AND SX-1250/S For servicing of the SX- 1250/HG or S please refer to pp.4 emphasis selector which are described in this supplement.
15.1
100, with the exception of the power supply section and the de-
CONTRAST OF MISCELLANEOUS-PARTS
FUSES Part No. Symbol
Amp
FU1·4 FU5
FU6
KCU type
HG type
1A
AEK-106
AEK-402
1.5A 1.6A
AEK-104 .. . . ... .
........
12A 6.3A 6A
AEK-301
..... . .. 0
•
••••••
Remarks
S type AEK-106
-
Secondary
---
AEK·104
AEK-405
.. ... ...
Lamp circuits
••
AEK-301
Primary vel tage : 11 OV, 120V Primary vol tage: 220V, 240V Primary voltage: 220V, 240V
0
•••••
AEK-404
. .......
........
AEK-109
SWITCHES Symbol
Part No.
Part Name
Remarks
KCU type
HG type
S type ASK-099
POWER 2-position 4-position with fuse holder
S1
Lever switch
ASK-080
ASK-105
S3
Plug i n selector (Line voltage selector)
........ . . . . . . ..
AKX-037
. .......
. . ..... .
AKR-031
KCU type
HG type
ATT-267
ATT-295
TRANSFORMER Symbol
T3
Part No.
Part Name
Power T ransformer
Remarks S type
-
ATT-291
RESISTOR
R1
Part No.
Part Name
Symbol
Carbon film 2.2M
%W
Remarks
KCU type
HG type
S type
RD%PS 225J
... .....
. .......
CAPACITORS Symbol
KCU type C12
C13
-
Part No.
Part Name
Ceramic Ceramic
0.01 0 .01
150V 250V
Ceramic Ceramic
0.01 0 .01
150V 250V
ACG-003
Remarks
HG type •••
•
•••
S type 0
••
0
0
••••
. . .. . ...
ACG-001
ACG-001
ACG-003
........ .. .. .. ..
. ..... . .
........ •
CQSA511J50
DC1.4kV
DC1.4kV
ACG-001
C15
Polystyrene 510p 50V
•
•
•
•
•
0
0
........
-· C16
Polystyrene 510p 50V
. .. .. . ..
CQSA511J50
C17
Ceramic
........
CCDSL560K50
56p
50V
•••
•
0.
0
0
........
101
P.C. BOARD ASSEMBLIES Part No.
Part Name
Remarks Stype
KCU type
HG type
AWX-099
........
. .......
........
. .......
AWX-101
Power supply assembly
AWR-107
AWR-108
AWR-1 07
Speakers switch assembly
AWS-095
AWS-098
AWS-095
De-emphasis switch assembly
2-position (25s.IS/75).1s) 3-position (25).1s/50).1s/75).1s)
OTHERS Part No.
Part Name KCU type
HG type
s type ADG-015
AC po\11/er cord
ADG-013
AC socket (OUTLET) AC socket (INLET)
AKP-005
........
AKP-005
.. ......
AKP-008
........
ARB-164
ARB-171 ARD-089
. .......
Operating instructions
........
10 2
0
•••
0
•••
Remarks
ARB-168
English German/ French
SX-1250jHG 1 15.3
3
2
4
5
6
SCHEMATIC DIAGRAM FOR SX-1250/HG
POWER SUPPLY .O.SS'y .O.WR ·106
r · -·- · - · - · - · - · -·-,
d
A
--1?.>-----,9-!_ f 30••
FM AM TUNER ASS')"
0, 2SC8U
• 2SD313P
• uv
PAOTECTIO" .o.ss•y .O.WM
'i
•0!1 )12
A
AWE · 06e
r ·- - - - - - - - - · - - -· - · - · - · - · - · - · - · - ·
! ,,....
I
• I
:~1
·---B
B
Lch
c
l
c
r~-·
RchlP..O.O
1
.,, SWITCHES, S, POWEA S, RELAT S, M.iO..T.IGf SfLECll.lll!l.Zllll i1ll401
$,
s. So S,. S,.
S• S, So
S• S• S, Su Sn S,.
D
S~
s. Sn
S,.
1 105
~M
FM ~ONO I
f'HONO 2/MIC AUX TAP( roNITOR I TAPE ~NITOR 2 TAPE DUPLICATE AOAPTOR MODE MUTING LOUDNESS TONE LOW FILHR HIGH FILTER SPEA,ER A SPEAI<EA B SPEAKER C
~ -ON
OFF-Q!:!
S,,
s. S,,
FM MUTING FM MULTIPATH REED RELAY
511
RELA'1
OFF -.Q!i QEt- ON
1
lch
ill - ON i l l - ON 2Ef.- ON Qft
ON
Q!l.- ON OFF- ON ON
.Qff:-
ill.!!.tQ- MONO Q!l.- ·2Qd6
2Et.-
ON
RESISTOR , IN 0HM,I/4W TOLERANCE UNLfS5 OTHERWISE NOTED K •ll H Hll
J
'5''
CAPACITORS, N..,F UNLESS
OTHERWISE NOTED P pF
c::::YJ <>
SIG~AL VOLTAGE AT SPEMER Ou'PuT DC CURRENT 0C VOLTAGE
J6V18ll '-"'
A I NO INPL T S•GNAL AT NO .NPUT SIG NAL
D
~-ON
QfrOFF -
J0H1 8kHt
E- ON
.QEE- ON OFF- ON
2
3
4
5
6
SX-1250/S 1 15.2
2
4
3
5
6
SCHEMATIC DIAGRAM FOR SX-1250/S
PROTECTION ASS'y AWM - 0,1 Y2
A
A flJ, llA 1110,1!0Vl 6Ail20, 744Vl
B
B
FM OE- EMPHASIS SWITCH Ass'y AWX - 101
I
~
~ ~--------~
PlfDHOl
r::JEJ
c
"[ ~~~
c
"' f
Pt1QNO ~
Rcn
l
""OhQ I
'"' SWITCMES; POWER RELAY fUst HOlDER
s, s, s, s, s. So
s. s,,
s, s, s,, s, Sm s., s. s" s.
D
s~
s. s, s.
1
A~
·~
?MONO 1 P>
LOUDNESS TONE .Ow FiLTER HIGH FILTER SPEAKER A SPEAKER B SPEAKER C
S,,
OFF- ON
-
s,.
lHOV 1.1'20V~?!0'<4.1oi0Vs,, Qf£. -ON S. OFF-Q!:! S" Qll- ON
!="'' MUTING Fl'\ MULTIPATH REED RElAY RELAY FM DE- EMPHASIS
OFF -.Qli
!!fr
1~,..s
-ON
i
m-o·
OFF- ON ON Qf£.-ON
Qtt-
MONO
.Qfr-·20dB
Qtt.-
'o,
o•
CAPACITORS. \_.F J'LESS
s.A ' C})
ON
ill.!lli!-
fi -®: :®-
RESISTOR ; IN 0HM.1/4W >5'' TCL~RANCE U"'ESS OTHERw·SE NOTED K •ll M Mll
OFF- ON
QEI-
CTHERW SE NOTED P
:1
·-:---·--
POWfR AMP ASl'y
~...:...__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _J __ _ _ _ _ _ _ _ _ _~-~---r · -----~
- so,.s - '!hl
p<
=C>
SIGNAL VOLTAGE AT SPEAo\(R :.TPuT DC CURRENT AT NO INPc T SIGNAL VOLTAGE AT NO INPUT SIGNAL
l8V/8 Q. 'kH L
or
QE.t... -ON
2Ef. -lOHi OFF-8kH a
~ -ON .Qtt.- ON
,~
.
.~
~
r 1
LJ ® '·
,
AWH-048
~
®,, ~
·L
i ~ _:?,·· '• iL_ ___ ____~ : ·.=..:_ _______ ' ~--j
D
()FF- ON
2
3
4
5
6 104
SX-1250/S 15.4
DE-EMPHASIS SWITCH ASSEMBLY (AWX-101, for S type)
,-
3
2
I
I
4
-, CL 0 0
CL 0 0
0J
0J
I
Cs 56P •
C,ISOP
I I I
L _________ j C6 56P
C1l'lDOP
o-tt-o
I
Si c~ 150P
0--fJ--0
C4 510P
o-U--o 0
0
0
0
1
o-u--o
:
Cz1200P
o-u--o
00
AWE-068, No.4
2 00
i
g Cs 5tOP
I
o-f 1-<>
AWE-068, No.1
3
00
AWE -068, No.5
4
00
AWE-068, No.2
Parts List of De-emphasis Switch Assembly (AWX-101, for S type) Symbol
Description
Part No.
S1
Slide switch (DE-EMPHASIS)
ASH -017
C1 C2 C3 C4 C5 C6
Ceramic Ceramic Ceramic Polystyrene Polystyrene Ceramic
CKDYA 122J 50 CKDY A 122J 50 CCDS L 151 K 50 CQSA 5 11J 50 CQSA 511J 50 CC DS L 560K 50
1200p 1200p 150p 510p 5 10p 56p
50V 50V 50V 50V 50V 50V
107
15.5
SPEAKERS SWITCH ASSEMBLY (AWS-098, for HG type)
ON
t
- x- --=e---x--, OFF
1'1
~
13
15 SP B
16 SP C
~
<:')
~
C!
0]
0
14 SPA
0
If)
Li)
a::"'
r2
I
L_ _ _ _
5 4
Parts List of Speaker Switch Assembly (AWS-098, for HG type) Symbol
Description
S1
Push switch {SPEAKERS!
R1 R2
Metal oxide resistor 150 Metal oxide resistor 150 Phone jack {PHONESI
108
Part No. ASG-100 3W 3W
RS3P 151 K RS3P151K AKN·010
2
3
SX-1250/ HG
I
1
I
2
3
A
A
. ..
.
AWM -091, No .8
-
::> 1 ~
0
~
0
.i...i
0
i...i
0
~
0 ~
0
~
0
~
0
62 SP. C
8
.
~
0
~
0
&...i
0
~
o -~
0
~
0
0
~
0
~
0
SP. B
&...i
0
ti...i
0
~
0
~
0
~
0
~
0
~
0
SPA
-
6
4
.O L O-
b b 6 b
5
RO
B
f'I R O-
c
8
~.
6
7 AWM -091, No .7
8
...
rAWS-094, No.1 AWR-106, No.8
<j>10
9 11 0 12
-
R· 150 l 3W,
<j>13
c R2
~ -
R O-
3
69
~
A
'"' L O
6
0
0
'"' L 0-
150 C3Wl
PHONES JACK
,r,
014
~PL
( VPL7 t
J~-
PL 5
6
c
915 016
.
0 17
7
D
D
1
I
2
I
3 109
15.6
POWER SUPPLY ASSEMBLY (AWR-108, for HG type)
~-------------,
.!
i I
. I
4t I
C.,O.OI/150
+~J~ SIBOI -ol•2
I
lr)
r" "'
..
0
~
+
~
u
6
"' c) ~
<:]
Parts List of Power Supply Assembly (AWR-1 08, for HG type) SEMICONDUCTORS Symbol
Description
Part No.
Dl D2 D3 D4
Diode Diode Diode Diode
SIBOl -04 SIBOl-04 SIBOl-04 SIBOl-04
D5
Diode
D6
Diode
SIBOl-01 (IS1885) SIB01·01 ( IS1885)
RESISTORS Symbol Rl R2 R3 R4
110
Description Wire wound Metal oxide Metal oxide Metal oxide
3.3 2.2k 10 10
Part No. 20W 2W 2W 2W
I
ACN·003 RS2P 222J RS2P lOOK RS2P lOOK
CAPACITORS Symbol
Description
Part No.
C1-C4 C5 C6 C7 C8
Ceramic Ceramic Electrolytic Electrolytic Electrolytic
0.01 0.01 470 470 470
250V 150V 100V 100V 25V
ACG-001 ACG-004 CEB 471P 100 CEB 471P 100 CEA 471P 25
C9 C10
Electrolytic Ceramic
470 0.01
25V 150V
CEA471P25 ACG-004
OTHERS Symbol
Description Micro temp Fuse clip
Part No. AEX-005 AKR-010
SX-1250/HG
.---+--o13 012
t t R> Z 2 K/~W
D1 ~ 04
SIBOI 01 <4
~~ -
0.01/250
C•
,4
ea
+
470/25
c. 0.01/ 150 <>-!!---<> 0
us S1BOI1ll 14 0
Ftl4 lA
~A
FU3 IA
CsQOI/100
<>-!!---<>
R1 33
L[
FU~
1.6A
C10WJ
• C9 <>-J;t-o 410/2~
10
9
8
7
011
6
5
AWR-106, No.7 AWR-106, No.6 '----~ AWR - 106,
No.15
GRN AC INLET
BRN GRN
cl2
220V 240V 50/ 60H
0.01 OR BLU BLU AWX -096, No.1
WHT
s.
AWM -091, No.2
D
111
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