sx-1250 service manual (hi-res)

AM/FM STEREO RECEIVER

s -1250 < ART-158-0>

- ·'- '

Q.,, PIONEER®

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.

SX-1250

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

r FM 300 Q BAL.

L '-¢-+-+-Juarr~

Mixer

Fig. 1. Circuitry of FM front end

IF il - -o-- _.,

15 1------------------------ -o-SIGNAL meter

Fig. 2. Block diagram for HA 1137

J 11

MODEL SX-1250 COMES IN THREE VERSIONS DISTINGUISHED AS FOLLOWS:

2

Type Voltage Remarks

KCU 120V only 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

s I•

11 OV, 120V. 220V and 240V (Switchable) General export model with de-emphasis selector switch ( 25~ots/501's/751's)

When repairing S or HG type, please see the manual on page 101 .

CONTENTS 1. SPEC! FICATIONS 4

2. FRONT PANEL 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5. LEVEL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6. BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7. DISASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

8. PARTS LOCATION

8.1 Front Panel View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

8.2 Rear Panel View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

8.3 Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

8.4 Bottom Vrew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

8.5 Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

9. ADJUSTMENTS

9.1 AM Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~-

9.2 FM Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.3 Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 38

9.4 Stabilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 38

10. DIAL CORD STRINGING .. .. ....... ... ............ ...... ... . .... ..... . 39

11 . EXPLODED VIEWS ....................... .... ................. .. ... .. . 40

12. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTS

12.1 Miscellaneous-parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

SX-1250

12.2 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

12.3 Internal Circuitry of Integrated Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ICs ................................... 6 Transistors .............................. 82 Diodes ................................ 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 than 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 than 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 1 00,000 Hz ~?d B

Input Sensitivity/Impedance POWER AMP IN ................ 1 V/50k ohms

Output 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 Network) .. 100dB

Preamplifier Section

Input Sensitivity/ Impedance PHONO 1 .................. 2.5mV/50k ohms PHONO 2 .................. 2.5mY/50k ohms MIC .............. . ....... 6.5mV/50k ohms AUX ...................... 150mV/50k ohms TAPE PLAY 1 ... ........ .... 150mV/50k ohms TAPE PLAY 2 ............... 150mV/50k ohms TAPE PLAY 2 (DIN connector) .... 150mY/50k ohms

PHONO Overload Level (T.H.D. 0.1%) PHONO 1 . . . . . . . . . . . . . . . . . . . 500mV (1kHz) PHONO 2 . . . . . . . . . . . . . . . . . . . SOOmV (1kHz)

Output Level / Impedance TAPE REC 1 ....................... 150mY TAPE REC 2 ...... .. ............... 150mV TAPE REC 2 (DIN connector) .... 30mV/80k ohms

4

PRE OUT I V/ 1 k ohm~ I OtJ I Ht~rmonic Distortion

(20Ht ot 20,000H7, 1 V ou tput) .. No more than 0.02% F rcquency Response

PIIONO (RIAA equal i;ation) . .30H; to 15,000Ht ± 0.2dB AUX, TAPE PLAY . .. . . . . . I OHz to 50,0001lt •?dB

Tone Control

BASS ................. MA IN ±10dB ( IOOilz) ± 5dB ( SOH1) ± I Od B (IOkllz) ± Sd B (20kHz)

SUB TREBLE ............... MAIN

SUB 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 PLAY ........... ... ...... 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 . . . . . 74dB Di stortion at 65dBf 1 OOHL ..... 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 (1kHz), 35dB (30Hz -15kHz) Subcarrier Product Ratio ......... . ........ 74dB SCA Rejection Ratio ............. ... . . ... 74dB Antenna Input . . .............. 300 ohms ba lanced

7 5 ohm~ u nbalanccd

AM Sec tion

Sen~itivity (I HI , f errite antenna) .. . ....... 300JJ.V/m (IH r, [xt. antenna) .............. 15JJ.V

Selectivity .... .... ....... . . .. . . ....... 40d8 Signa l-to-Noise Ratio ....... .. ............ 55d8 l mc~ge Response Ratio .. . .. . .. . ........... 65d8 I r Response Ratio . . . . . . . . . . . . . . . . . . . . . . . 85d 8 Antenna ........... Built-in Ferrite Loopst ick Antenna

Miscellaneous

Powe1 Requirements . . . . . . . . . . . . . . . . . 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 improuemen 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 the wrench counterclockwise. Be particularly careful not to scratch the front panel when employing the wrench.

SX-1250

5

2. FRONT PANEL 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.

AM ......... For AM broadcast reception.

PHONO 1

AUX

To operate a turntable connected to the PHONO 1 input jacks.

For listening to audio component (cartridge tape player, TV sound tuner, etc.) connected to the AUX input jacks.

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 broJclcJ~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.

r TAPE -----,

PHONO 2/MIC. As above for PHONO 2 jacks, or for reproduction through microphones connected to the M IC iack is on the front panel. Note, when the microphone is connected to the jack the turntable connected to the PHON02 jacks cannot be used.

OUPl.ICATE M O NITOR AOAPTO~

1 2

0~ 09 0~ 0~ TAPE MONITOR (1, 2) SWITCHES J

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) .

For normal use, leave in the OFF (up) positions.

6

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.

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.

22 18

34· 18,2

~~,·'''•/~ 110 MUTING

40 ~~ ~· B

~ ~ 48 - B .

• • ' 4 54

' - 20d8 62 . 2

70 ~ 0 -dB

VOLUME

SPEAKER BUTTONS Three sets of speaker terminals, A, B, and C, are provided on the rear panel, 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 de

pressed 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.

PHONES JACK Accepts stereo headphones.

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 control 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 response regardless of the tone control setting.

FM TUNING METER With the SIGNAL meter needle deflected to the right, make fine adjustment by centering the FM TUNING meter needle (indicating optimum reception).

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

work together. The optimum point of the SIGNAL meter needle is the same as in AM tuning. Then use the FM TUN ING meters.

SPEAKER SYSTEM INDICATOR FM STEREO INDICATOR

l r r ,

1 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.

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.

PROGRAM SOURCE INDICATOR )

r r I r 1

--- - I~"~II?EI ---~- 0 1---:~;:--------,-,al,-,-.~-. -, -qz_,t_9.!::4= .. !~,9=6=,=98=-,=I=OO=,=I=OZ=I:::!...lg_-14-,-I 0-6-, -,\,2-;8-,-------~~ . ,/ ,~ AM U •o 10 U 9C> Ill 10 Ill 111 .J(. IU I ~( •0 ,. 1Qkl-ll

- ... +

JlU~ I 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.

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.

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.

SX-1250

MIC JACKS (L and R) For connect each channel jacks the left and right channel microphones.

NOTE: Use the high impedance (aboue 20kn.) with 6mm diam. phone plugs.

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 audio output by 20dB. This conven ient feature saves having to disturb the VOLUME control, for example when answering the telephone.

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 CONTROL Adjusts the balance between the sound volume from the left and right speaker systems or headphones.

B

3. CONNECTION DIAGRAM

8

TURNTABLE

OUTDOOR FM ANTENNA

T -TYPE FM ANTENNA

300!1 feeder

AM ANTENNA (Indoor or Outdoor)

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 . ) wi th a Dolby • system NR adaptor con· nected between the ADAPTOR OUT and ADAPTOR IN

terminals.

* I he word "Dolby" is a trademark of Dolby Laboratories I nc.

TURNTABLE

GND

R IGHT LEFT

SPEAKER SYSTEMS A

TAPE DECK (open-reel , cassette)

LINE INPUT

LINE OUTPUT

TAPE DECK (Open-reel, cassette)

LINE "INPUT

LINE OUTPUT

c~UIION ~J ~JI Rt MOH I~'<!'A S Sll 801 10M NOI Ct

SV'~ ll..>llll ""'*S""tTt:,..£0

SCJ ..... MA:>e IO,.,L~W ..... oAll.

-" j !"

' , r-: .. ;;.

I

' I I

'··

;,I ..t

"

~r fi f; "i L, !(

i ~

I L ~

' RIGHT LEFT RIGHT

DOLBY NR ADAPTOR 4 CHA NN EL DISCRETE FM ADAPTOR

- -- ~

:.)o D EJ

LINE INPUT

LINE OUTPUT

PRE/POWER AMP

0

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 from the speakers. Always be sure to

switch off the power supply before attempting to remove them.

CONVENIENCE OUTLETS Unswitched: (200W max.)

Switched: (SOW max.)

LEFT

Less frequently used components, which do not requ ire coupled power, can be p lugged into either of these outlets.

A frequen 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 switch operation.

SPEAKER SYSTEMS B SPEAKER SYSTEMS C

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.

SX-1250

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 Miur

r FM 300 Q BAL.

L ~OOfrr~

Fig. 1. Circuitry of FM front end

IF i1 ~-o---l

15


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 feedback 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 -¢- +l

SifUI

Lch o•tprt

Sepa. adj. Rch

output

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 feedback amplifier amplifies the demodulated signal to produce the IC outputs.

I ___ _j

STEREO indicator


12

+ 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.

:. . ___ ___________ ------- ___ /

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.

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).

HA1137 Schmitd circuit

Af output circuit

-!-Jr I Reed

+ Vee, relay

I Fig. 5. Circuitry of FM muting

SIGNAL meter

10 Af

outpwt


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.

+ Vee

Output H~--+-+--+-.--tt--0

Vee Fig. 7. Schematic diagram for Equalizer amplifier

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).

14

TAPE 1 REC @

TAPE 2 REC @

--- DUPLICATE

switch Function o--._ ___ __..._ __ switch

Fig. 8. TAPE REC jacks

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 TAPE 2 PLAY PLAY

J 011! FunctiDII TAP£ IIIOIIITOR 2 TAPE MONITOR 1 switch

switch 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 TAPE 2 REC PLAY REC PLAY @ @ @ @

------ DUPLICATE

switch

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

OUT @

IN

1 TAPE IIIOIIITOR 2 o-----_j----A-'DA!1'PT~OR>---

switch 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.

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 LOUDNESS 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 SX-1250. 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 feedback is applied to a single transistor amplifier. Frequency response becomes variable by providing selectivity in the feedback circuit. The basic circuit of this stage is shown in Fig. 12.

R 4 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.

SX-1250

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, C 2

Ra

R, VR , R.

Fig. 14. 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,

R 4 YR 2 R,

Fig. 15. 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 bypassed.

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 passband 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.

''~1

Ycc , o-- __ __._ _ _____,.__..__ ____ __,

~~~·· <Bl low filler

lOW FilTER switdt

z UJ 1-

~

z: Compos1!e w curve I-

tt

-IZdB/oct

-12 dB/oct

~---------~ HIGH rllTIR switch

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----<1>-------0 Ycc,

Fig. 17. Schematic diagram for power amplifier

16

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.

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.

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

01erload

detector

Center poi1l pote1lial •elector

Relay drin

Rf.-Gh Fig. 18. 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

SX-1250

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.

Note: QS is normally ·OFF due to base bias and does not participate in the muting operation.

Operation by Detector Circuit Command Command from the detector circuits pass 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"'"---.,..---,

Detectors I Relay ~ ceil

R •• 0 6 Vee o-~Mr-.._."Nv~__,-'V\/Ir-,.._--o AC

R •• 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 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

+ Vee

Power a~a,lilier

- Vee

l + Vee

'

I '

I I '

I ' I Vee

Fig. 21 . Basic circuitry for center point potential detector

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 contact. 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.

! ' Relay

S, Fuse Rectifier

Fig. 22. Basic circuitry for inrush current suppressor

5. LEVEL DIAGRAM AUX

(TAPE)

PHONO u------1.

[ dBV]

30

20

10

0

- 10

I

- 20

- 30

- 40 - MIC 6. 5mV

- 50 PHONO 2. 5mV

- 60

-8. 3dB

AUX 150mV , I

I co "0 en en C'>")

I

sx-., eso

8 Q

I I I SPEAKER 39V ' I

I I co

'"0 N C'>")

POWER IN lV/

/~ / <.D

T

FREQUENCY: 1kHz

1 9

6. BLOCK DIAGRAM

FM 75.0. Uf.:BAL.

AUX

PHONO 1

PHONO 2

MIC

MIC

AU X

AC POWER 120V

2 0

GND

AM

AC outlets

Power amJ.

• L._ __ _

------

r-·---

J 'oNe

J ProtecttJn Ctrcwt

~ ........ +-t...._...} ;tamp

--1---tt+-] Con·.tol secC,on

,.-'V\.fV-.-~

I I

r--- J I

:srt:•lEO 1 A: I mJ ".._r.t ,., ~·&-

---~ ___ j ----

. L__ __________________ _

SWrTCHES :

S • • POWEK

( FUNCTION)

S11 : AM S12 : F M S•3: PHONO 1 S14 · PHONO 2/MIC Sts: AUX

St6: TAPE MONITOR 1 Sn: TAPE l'I.ONITOR 2 Sta: APE DUPLICATE S19: ADAPTOR 520: MODE Sz1 : MUTING Sn: LOUDNESS Sz3: TONE 5(4: LOW FlLTER Sts · HIGH FILTER

Sza

SX-1250

(SPEAKERS) S2s-: SPEAKE~S A $27 : SPEAKERS B S 28; SPEAKERS C

Sz~: FM MUTING s30 : FM MULTI PATH S31 : FM DE-EMPHASIS

! PRE OUT

! PRE OUT

SPEAKER A

SPEAKER B

SPEAKER C

PHONES

SPEAKER A

SPEAKER 8

SPEAKER C

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

Bottom Plate Remove the fifteen screws to detach the bottom plate.

22

A \?

~ B

Fig. 25

Fig. 26

Front Panel

Loosen the s all the k etscrews of TU R nobs by pulr NING and VOL emove the three nu~n[" Remove the two UME knobs with a h mm the sub-tone a :;'"'ws from the t exagona! wrench R n volume cont l op edge of the f . emove ro shafts. ront panel.

Front panel

Loosen the setscrews

. .,

l Tone Am IT R p I ler Assembl

emove the th y ree screws (C).

Fig. 27

f$f E ~"'

EE E~ F

Speakers Switch A ~· Remove the fo ssembly .-ur screws (E).

Filter Am IT R P I ler Assembl emove the t y wo screws (F).

Flat Am IT R p I ler Assembl emove the th y ree screws (D).

Function Switch Remove the t Assembly ---~ll"f:(~ ~ wo screws (G).

SX-1250

Fig. 28

Fig. 29

24

8. PARTS LOCATION

8.1 FRONT PANEL VIEW

25

Knob (FILTER 30Hz) AAD-114

Knob (SPEAKERS C) AAD-114

Knob (SPEAKERS B) AAD-114

Knob (SPEAKERS A) AAD -114

Knob (POWER) AAD-113

Knob (BASS 50Hz) AAB-100

Knob (BASS 100Hz) AAB-100

Knob (TONE) AAD-113

•

Knob (FILTER 8kHz) AAD-114

'

Knob (FM MULTIPATH) AAD-114

Knob (FM MUTING) AAD-114

Front panel assembly ANB-386

-r -... -- ~~. ________ .............., .............. .....__,..,._:

.__._. • ._.._ .... _._. .... ._.._...___..;_._.~Me-.~.-.-.-~• c5 o ~ (). ?5 6 r~ r'· ·· (~ -· t'- . ••

. (

...... .. II

Knob (TREBLE 10kHz) AAB-100

Knob (TREBLE 20kHz) AAB-100

lR£U1..£

.r

ioi'l,h .. ,

. ........... f.

-~~-/ • • • • ~ I "" II -II · I I I

Knob (TAPE MONITOR 1) AAD-113

Knob (TAPE DUPLICATE) AAD-113

...

l

Knob (AM) AAD-1 14

Knob (FM) AAD-114

Knob (PHONO 1) AAD-114

Knob (PHONO 2/ MIC) AAD-114

Knob (AUX) AAD -114

Knob (Tuning) AAA-034

Knob (MUTING ) AAD -113

Knob (VOLUME) AAB-104

Knob (LOUDNESS) AAD-113

Knob (MODE) AAD-11 3

Knob (BALANCE) AAB-100

Knob (ADAPTOR) AAD-113

Knob (TAPE MON ITOR 2) AAD-113

)

8.2 REAR PANEL VIEW

Terminal (TAPE 2) AKB-030


Terminal (INPUT) AKB -033

Terminal (GND) • AKE-012

Bar-antenna holder W72-092

Ferrite bar-antenna ATB-051

Terminal (ANTENNA) AKA-004

Slide switch (DE-EMPHASIS) ASH-015

SX-1250

Connector socket 5P ( R EC/PLA Y) AKP-007

Term inal (ADAPTOR) AKB-030

Terminal (SPEAKERS) AKE-014

Terminal (PRE/ POWER AMP) AKB -030

AC power cord ADG-013

AC socket (AC OUTLETS) AKP-005

Terminal (FM DET OUT) AKB-019

28

8.3 TOP VIEW

29

Electrolytic capacitor (22 OOOpF 80V) ACH -056 '

Relay (S2) ASR -015

Power amp lifi er assemb ly AWH-048

Protection circuit assemb ly AWM-091

Tuning drum assembly AXA-070

FM front end AWB-023

Lamp assembly (PL 1- PL4 8V 0 3A) AEL-056 ' ·

Lamp board assembly AWX-096

• -------·

• I I

Power transformer ATT-267

Electrolytic capacitor (22 OOOpF 80V) ACH-056 '

Power amplifier assembly AWH-048

Stabi lizer assembly AWR-106

Tuner assembly AWE-068

Equalizer amplifier assembly AWF -021

Tuning shaft assembly AXA-111

8.4 BOTTOM VIEW

Fuse lA (FU l ) AEK-106

Fuse 1A (FU2) AEK-106



Fuse 1.5A (FU5) AEK-104

Function switch assembly AWS-094

Flat amplifier assembly AWG-042 1

SX-1250

Ferrite balun T22-025

Fuse 12A (FU6, primary) AEK-301

Power supply assembly AWR -107

Filter ampl ifier assembly AWM -089

Speakers switch assembly AWS-095

Ceramic capacitor (0.01,uF 150V) ACG-003

Control amplifier assembly AWG-041

32

8.5 FRONT VIEW

Indicator (STEREO) AAT-028

Indicator (SP-A, SP-B, SP-C) AAT-026

Push switch (SPEAKERS) ASG-094

Phone jack (PHONES) AKN-010

Lever switch (POWER) ASK-080 ..

•

Variable resistor ( 102k, 5-step, BASS 50Hz) ACV-165

33

Variable resistor ( 1 02.6k, 11 -step, BASS 1OOHz) ACV-166

Lever switch (TONE) ASK-090

Variable resistor (99k, 11·step, TREBLE 1OkHz) ACV-167

Variable resistor ( 1 02k, 5·step, TREBLE 20kHz) ACV-168

o. ------------~----~~

Lever switch (TAPE MONITOR 2) ASK·092

Lever switch (TAPE MONITOR 1) ASK-092

Lever switch (DUPLICATE) ASK·084

Double meter (SIGNAL/TUNING) AAW-040

Push switch (FILTER, FM MUTING, MULTI PATH)

ASG-098

Indicator AAT-027

Dial scale plate AAG-106

Tuning shaft assembly AXA-111

Push switch (AM, FM, PHONOI, PHON02/MIC)

ASG·095

Phone jack (M IC) AKN-013

Lever switch (MUTING) ASK-090

Variable resistor (50k, 32-step, VOLUME) ACV·169

Lever switch (LOUDNESS) ASK-090

Lever switch (MODE) ASK-090

Variable resistor (100k-HB, BALANCE) ACV·163

Lever switch (ADAPTOR) ASK-092

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 fre

quency for 600kHz. 6 . Adjust T3 core for maximum reading on AC

voltmeter. 7. Set SX-1250 dial indication and AM SG fre

quency for 1 ,400kHz.

AC Voltmeter

4 ~ .. ,. . -•

• •

SX-1250

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 fre

quency 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 fre

quency 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.

AM Signal Generator

~ oo@ 0 0

@ 00 0

0 0

Fig. 30

35

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 fre

quency 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 fre

quency 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

&0&0 TC3 TC2 m

TC4 Cj 0 TC1

c@f'T4 0

T5

0 ((@)-T6 lli

Fig. 3 1

3 6

Tuner Assembly 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 re

ceived 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 indica

tion 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.

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 sinewaue. These form a Lissajous ' figure such as shown in Fig. 32.

----=

a f4 a 14 =-1-~~ ~~ I ~. ~ I

r~ I I a ., ~ ~n .. ~ ~

I II I!! !!!I

I c

Fig. 32

SX-1250

AC Voltmeter Distortion meter

~ 0@) 0 0

MPX Signal Generator

0 0

FM Signal Generator

~@ Q 0 00 0 0

0 0

0

<0 dummy @ 00 0

antenna

Probe ® i

VERT. HORIZ.

p

DC Voltmeter

•

FM Front End

Fig. 33

37

9.3 POWER AMPLIFIER

1. Tum VR2 fully counter-clockwise before turning on the power.

~- Remove jumper plugs connecting POWER IN and PRE OUT jacks.

3. Connect 5.1 k-ohm resistor to POWER IN jacks. 4. Set power amplifier for no load. 5. Set POWER switch to ON. 6. Adjust VRl for OV between terminal No.9 and

ground. 7. Adjust VR2 for lOOm V between terminals

No.7(+) and No.l9 (- ). 8. Allow set to warm up for at least 10 minutes,

then readjust.

Fig. 34

38

9.4 STABILIZER

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 (- ).

Stabilizer Assembl

'

Fig. 35

10. DIAL CORD STRINGING 1. Remove the wooden cover and the front panel. 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 panel) 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.

SX-1250

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 terms 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

AT Brazier head tapping screw

PT Pan head tapping screw

BT Binding head tapping screw

CT Countersunk head tapping screw

TT Truss head tapping screw

OCT Oval countersunk head tapping screw

PM Pan head machine screw

CM Countersunk head machine screw

OCM Oval countersunk head machine screw

TM Truss head machine screw

BM Binding head machine screw

PSA Pan head screw with spring lock washer

PSB Pan head screw w ith spring lock washer and flat washer

PSF Pan head screw with flat washer

EXAMPLE

PM 3x8

L_ length in mm ( I )

40

diameter in mm ( d )

Symbol

Shape Symbol Description

(JeD EW E type washer

(jc:D FW Flat washer

(leo sw Spring lock washer

[)en N Nut

(]en WN Washer faced nut

tn=o ITW Internal toothed lock washer

(jc::J OTW Outernal toothed lock washer

[)c=:l sc Slotted set screw (Cone point)

[)1:J SF Slotted set screw (FIat point)

(jc:l HS Hexagon socket headless set screw

{)c::l ocw Oval countersunk head wood screw

ao cw Countersunk head wood screw

(1:=1 RW Round head wood screw

oP

ln:::=cl l/ J t

FW 9</lx1 1

T 1 l__ thickness in mm ( t )

~diameter in mm (d)

Symbol

Shape -

Cb ~ -

@ ~

© I © ~ @ ~ (g i @ J

a D

€} D

@ ID>

~

~ --~

G ....

A

B

c

D

1

Exterior

Screw 4x15 ABA-113

Wooden cover AMM-049

2

Coil spring ABH-022

AT 3x8 Spacer 'il AEC-258

Front panel assembly ANB-386

Washer faced nut ABN -024

Knob (BASS 50Hz, 100Hz) Knob (TREBLE 10kHz, 20kHz) Knob (BALANCE) AAB-100

1

Knob (Tuning) AAA-034

2

Screw 4x15 ABA-113

Knob (VOLUME) AAB-104

Mask AED-018

3

3

Screw M4x8 ABA-123

Top plate ANE-105

4

Screw 3x8 ABA-002

See Page 48.

Screw 4x8 ABA-012

Foot AEC-178

Knob (MUTING, LOUDNESS, MODE) Knob (POWER, TONE, ADAPTOR) Knob (TAPE DUPLICATE, MONITOR) AAD-113

4

See Pages 43-47.

Screw 4x8 ABA-012

AT 4x16 Foot AEC-178

5

Screw 3x8 ABA-081

5

SX-1250

6

NOTE: Parts indicated in g·reen type cannot be supplied.

Screw 3x8 ABA-002

Screw 4x8 ABA-012

Screw 4x8 ABA-012

AT 4x16

Screw 3x8 ABA-081

A

B

c

D

6

42

A

B

c

D

43

1

(FRONT) 'de Component Tilp Sl Pulley shaft

ABA-114 Pulley AEC-101

RT 3x6

RT 3x8

Rubber bracket B AEB-086

(STEREO) Indicator AAT-028

\ RT 3x6

1

2

RT 3x8 RT 3x6

Acrylic boardAEC-272

RT 3x6

2

3 4

Rubber spacer AEB-087

Blind sash AAP-037

RT 3x6

PL 1- PL4, 8V 0.3A) Lamp ass, mbly ( AEL-056

I

!board assembly Lamp AWX-096

RT 3x8

RT 3x6 Pull y shaft AB.4,-114

Pulley AEC-101

RT 3x8 (SIGNAL/TUNING) Double meter

AAW-040

Rubber bracket A

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

. g shaft assembly Tunm

AEL-075 AUX jPLI2)

AEL-073

AXA-111 FM PH -1, PH -~. AUX) Indicator (AM, '

AAT-027 Pul(ey ~haft Washer 9</> ABA-114

M45-086 Pul~y ,~small) 9,~.. AE -2.J6 Nut '~'

871·004 J~ Shaft cover \T -~ AAT-025

Tuner assembly AWE-068

·ng drum assembly Tum AXA-070

RT 3x6

Panel base ABN-022

Blf3x6

3 4

--===~5[===;~~~---=:::::b:suuppl ied. - NOTE: . '""" typoo•nnot e' Parts indicated m g

6

RT 3x6

RT 3x6

5

RT 3x6

Equal izer amplifier assembly AWF-021

Pulley shaft ABA-114

Pulley (small) AEC-256

RT 3x6

6

A

B

c

D

1

Top Side Component (REAR)

A

RT 3x10

B

c RT 3x6

D

1

2 3

Screw 3x8 ABA-002

Power amplifier assembly AWH-048

t 1

Connection cable housing ADX-037

Transistor 2SD555-R

PM 3x16 RT 3x10

/

RT 3x10

Connecting plate AKF-053

Spring lock washer ABE-018

Binding head screw M 4x5 ABA-129

2

RT 3x6

Connecting plate AKF-053 Spring lock washer ABE-018

Bindif,g head screw M 4x5 ABA1129

3

SX-1250 4 5 6

NOTE: Connection cable housing ADX-033

Parts indicated in green type cannot be supplied.

4


Protection circuit assembly Connection cable housing AWM-091 ADX-031

I Connection cable housing Stabilizer assembly ADX-036 AWR-106 Connection cable housing

ADX-030 Connection cable housing ADX-034





Power Amplifier assembly AWH-048

Screw 3x8 ABA-002


Insulator wafer AEC-076

RT 3x10

Transistor 2SD555-R RT 3x6

RT 3x10

5 6

A

B

c

D

46

1

Bottom Side Components

A

RT 3x6

B RT 3x6 ;? Lever switch (POWER)

ASK-080 ~

RT 3x6 ~

2 3

NOTE: Parts indicated in green type cannot be supplied.

Fuse holder 1P Terminal strip 2P AKR-028 AKC-030

Relay ASR-015

RT 3x8

Wire supporter AEC-151

RT 3x6

Terminal strip 2P AKC -038

Terminal str ip 2P AKC-030

RT 3x8

l T3x6

Power supply assembly AWR-107

C Speakers switch assemb ly · AWS-095

D

47

1

Control amplifier assembly AWG-041

Microphone jack assembly AWX-097

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

Flat amplifier assembly AWG -042

2 3

A

B

c

D

A

B

c

D

48

1

Rear Panel Component


Terminal (PRE/POWER AMP) AKB-030

Terminal (FM DET OUT) AKB-019

Terminal (TAPE 1) AKB -030

De-emphasis switch assembly AWX-099

Terminal (INPUT) AKB-033

~ Internal toothed lock washer ABE-006 ,

l Terminal (ANTENNA)

TNut7¢> 871-010

AKA-004 RT 3x8

RT 3x10

Strain relief AEC-079

Terminal (GND) AKE-012

RT 3x8

1

Bar-antenna holder W72-092

2

2

3


a ~

9M 3x8 I

r T-3x10 RT 3x8

RT 3x6

Strain relief AEC-079 Screw 3x8 ABA-002 AC power cord ADG-013

RT 3x8

3

A

c

D

A

B

c

D

1

Flat Amplifier Assembly (AWG-042)

Lever switch (DUPLICATE) ASK -084

Lever switch (MONITOR 1) ASK-092

P C bo rd t- d mrt I

Screw ABA-116

Washer faced nut ABN-024 Union nut

ABN-021

Control Amplifier Assembly (AWG-041)

Variable resistor (102.6k, 11 -step, BASS 100Hz) ACV-166

Variable resistor (102k, 5-step, BASS 50Hz) ACV-165

P C bo:1rd held '!leta

Washer faced nut ABN-024

Screw 3x6 @( ABA-116

Washer faced nut ABN-024

1

2

PC. 'Jo ra

RT 3x6

RT 3x6

2

SX-1250

3 NOTE: Parts indicated in green type cannot be supplied.

Lever switch (MONITOR 2) AKS-092

Lever switch (ADAPTOR) ~K~2 A

Variable resistor (100k-HB, BALANCE) ACV-163

Variable resistor (50k, 32-step, VOLUME) ACV-169

I Lever switch (MUTING) ASK-090

Lever switch (LOUDNESS SK-090 Lever switch (MODE) ASK-090

h £ Ia cov.•r

Lever switch (TONE) ASK-090

Variable resistor (99k, 11-step, TREBLE 10kHz) ACV-167 Variable resistor

( 1 02k, 5-step, TREBLE 20kHz) ACV-168

P (.. bO r

3

B

c

D

4 9

A

1 2

Switch Assembly (AWS-094) Push switch (AM, FM, PHONO 1,

PHONO 2/MIC, AUX) ASG-095

3


Switch Assembly (AWX-099)

p (

PC bo rd

Slide switch (DE -EMPHASIS) ASH-015

8 Switch Assembly (AWS-095)

Push switch (SPEAKERS A, B, C) ASG-094

Microphone Jack Assembly (AWX-097)

c

D

50

Phone jack (PHONES) AKN-010

Filter Amplifier Assembly (AWM-089) Push switch (FILTER, FM MUTING, MULTIPATH)

ASG-098

p

1

~ I

Phone jack (MIC) AKN -013

PC b r

5P Connector Assembly (AWX-062)

5P connector socket ( REC/PLA Y) AKP-007

l, b r

2 3

A

8

c

D

12. SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LISTS NOTE:

• Capacitors: in fJ.F unless otherwise noted p:pF 12.1 MISCELLANEOUs-PARTS • Resistors: inn, *W unless otherwise noted k:kn, M :Mn

SEMICONDUCTORS FUSES

Symbol Description Part No. Symbol Description Part No.

01 Transistor 2SB600-R FU1 Fuse 1A AEK-106

02 Transistor 2SB600-R FU2 Fuse 1 A AEK-106

03 Transistor 2S0555-R FU3 Fuse 1A AEK-106

04 Transistor 2S0555-R FU4 Fuse 1A AEK-106

05 Transistor 2SB600-R

06 Transistor 2SB600-R

FU5

I Fuse 1.5A AEK-104

FU6 Fuse 12A (primary) AEK-301 Q7 Transistor 2SD555-R 08 Transistor 2SD555-R

COILS AND TRANSFORMER

SWITCHES Symbol Description Part No.

Symbol Description Part No. T1 Ferrite balun T22-025 T2 Ferrite bar-antenna ATB-051

S1 Lever switch (POWER) ASK-080 T3 Power transformer ATT-267 S2 Relay ASR-015

RESISTOR LAMPS


R1 Carbon film 2.2M Y:.W RDY:.PS 225J PL1 Lamp assembly {8V, 0.3A) AEL-056 PL2 Lamp assembly {8V, 0.3A) AEL-056 PL3 Lamp assembly {8V, 0.3A) AEL-056 CAPACITORS

PL4 Lamp assembly (8V, 0.3A) AEL-056 PL5 Lamp with leads (8V, 50mA, AEL-074

Symbol Description Part No.

SP-At C1 Electrolytic 22,000 80V ACH-056 C2 Electrolytic 22,000 80V ACH-056

PL6 Lamp with leads {8V, 50mA, AEL-072 C3 Electrolytic 22,000 80V ACH-056 SP-B) C4 Electrolytic 22,000 80V ACH-056

PL7 Lamp with leads (8V, 50mA, AEL-073 C5 Ceramic 0 .01 50V CKDYF 103Z 50 SP-C)

PL8 Lamp with leads (8V, 50mA, AEL-076 C6 Ceramic 0.01 50V CKOYF 103Z 50 AM) C7 Ceramic 0.01 50V CKOYF 103Z 50

C8 Ceramic 0.01 50V CKOYF 103Z 50 PL9 Lamp with leads (8V, 50mA, AEL-075 C9 Ceramic 0.01 50V CKOYF 103Z 50

FM) C10 Ceramic 0.01 50V CKOYF 103Z 50 PL10 Lamp with leads (8V, 50mA, AEL-074

PH-1) C11 Ceramic 0.01 50V CKOYF 103Z 50 PL11 Lamp with leads (8V, 50mA, AEL-072 C12 Ceramic O.Q1 150V (DC1.4kV) ACG-003

PH-2) C13 Ceramic O.Q1 150V (OC1.4kV) ACG-003

PL1 2 Lamp with leads (8V, 50mA, AEL-073 AUX)

PL13 Lamp with leads {8V, 50mA, AEL-069

C14 Electrolytic 100 6V CEA 101P 6 C18

I Mylar 0.1 200V COMA 104K 200

C19 Mylar 0.1 200V COMA 104K 200

STEREO)

51

I Appearance Externa

HA1137 HA 1138 HA1196

HA 1201

3SK39 3SK45

2SB600 2SD555

2SA899A

2sC1904

2SC1166

of TranSIStor . sand ICs

910111213141516

~~h 5678

~, ..

Inde_x

0

~G2 G1

~

tY~

2SK30AW

2SA684A 2SC1384

2S8507P 2SB630 2SD313P 2SD325R 2SD610

2SA628 2SA720 2SA733 2SA750 2SA858 2SA872A 2SC945A 2SC1318 2SC1439 2SC1775A

2SC1342

2SA725 2SA726 2SA850 2SC710 2SC869 2SC1312 2SC1313 2SC1735

SX-1250

m:c

52

A

B

c

D

5 3

1

12.2 SCHEMATIC DIAGRAM

., C!l!:!J

'~< "' ~ m!!J

PC'K 1

[!EJ

''"

.. l [!!!)

"'"

l ..... ' "'

SMTCHfS; S, POWEf' St ~fi..A'1

I"UTII't:i LOIJDNE.~ TO!<E \.OW FtLT[f\ HII;H FILTEf\ ~EAr.fO.. A. SPE.IIKE.f\ 8 sPEAHff', C

1

2

9ES•STO'< • I'll OnM,I/-4'1" tS4fc TOlff\4.-..(:f \J'tlf.SS ~TI"'E.Aw SE. NOTED K : ~.a. 11 ~Q.

CA.F~C11'CflS; IN.-,.F !J'olfSS o·HfRIIIISf. NOTED P pF

2

3

r·-------~~~ ASS'y_ AWE·.C!!.._ _______________ _

I t

SIGNAl., \ 'Ol.T.AGE AT SPEMER O.JTP\.-T W/8Q. lltH1

OC ~~MEf'IT 41 t..0 "'P\IT SISIII.Al 0C V0~1'AGE AT NO JHP<JT S!:lNAl

3

4

4 5

PI\OTEC.T IOtl ASS'y Aw" -051 Y,

6

6

1 ''"

J

A

B

c

D

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

HA 1201

.-------------,

~ 4

12.4 THE CIRCUIT OF FM FRONT END (AWB-023)

I

I I

I I

SX-1250

TA 7061AP

56

A

B

c

D

57

1 2

12.5 TUNER ASSEMBLY (AWE-068)

Q1 HA 1201 ~ 2 HA 1201

IN 44-

30

l2 ~------+-------------_J ~--~

13±1V 32

osc vc

E

T3 21 o------- - h --t-------. 1 I

1

26 E

II

~n~ ~ - ~ 2'7 22 AN7 A"' ~CCAL V':- ... 8

23 E

2

Css Q.:J1

2t. RF vc

2. 2p f-l

25 t:

R22 2.ZK

2.8 A'1 ANT

Css 1' O.l/35

3

c, 0.01

f1

.., Qe, Qs .OJO 0?

2SC.945A x3 6.SV

Os

3

33

Qr;

2SC13H

11 E

4

34 35

12 11 10

5 6

Q4 TA7061AP

+B 13~1V

14 MUT NG

R Jl 2..2K AUTO L-------~~~-~--~~~~~~---+~~--~~--------------~~-o13 out

39 12 +B FM

25V CET out

4

10 vco t<dler

'7 ST PILOT

5

Multipatf'l

2 3 4 5 6

6

A

B

c

D

A

8

c

D

1

AWB-023, No. F +-------1---.0r. 32

0 31

- 30 j F!

AWB-023, No.G ----++--.r.o 29 ~~ G 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 ~ -

AWS-094, No.38 ~---+-+---o~""~22

AWB-023, No.E ....., 21

c 20

2

AWS-094, No.39-

1 2

3 4 5

AWM 089, No.5+--------------. AWS-094, No.22~-----------,

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 1

t.H

AWS-094, No.34+----~

AWS-094, No.41-r-

AWS-094, No.B7 ~--'

3

c 33 034 c 35 c 36 c 37

4

c 38 c 39 c 40 c 41 0 42

FM DET OUT @-- ;;;,

AWS-094, No.33 --....J

AWS-094, No.32+------_.

AWR-1 06, No.9 +------...J

Fe

AWX-099, No.2 _____ _J

AWX-099, No.3 +------....J

AWX-099, No.1 t---------...J

AWX-099, No.4+-----------l

5

SX-1250

6

A

8

c

D

6

60

Parts List of Tuner Assembly (AWE-068)

SEMICONDUCTOR


01 IC HA1201 R6 Carbon film 330 RDY..P5 331J



04 IC TA7061AP R9 Carbon film 56 RDY..P5 560J

05 IC • HA1138 R10 Carbon film 56 RDY..P5 560J ,

06 IC HA1196 R11 Carbon film 560k RDY..P5 564J

Q7 Transistor 25C1312·G R12 Carbon film 470 RDY..P5 471J

as Transistor 25C945A·O R13 Carbon film 680 RDY..P5 681J

09 Transistor 25C945A·O R14 Carbon film 47k RDY..PS 473J

010 Transistor 25C945A·O R15 Carbon film 10k RDY..P5 103J

011 Transistor 25C945A·O R16 Carbon film 4 .7k RDY..P5 472J R17 Carbon film 47k RDY..P5 473J

Dl Diode 152076 R18 Carbon film 1k RDY..P5 102J

D2 Diode 152076 R19 Carbon film 15k ROY..P5 153J

D3 Diode 152076 R20 Carbon film 470 RDY..P5 4 71J

D4 Diode 152076 05 Diode 152473 R21 Carbon film 470 RDY..P5 471J

R22 Carbon film 5.6k RDY..P5 562J

D6 Diode 152473 R23 Carbon film 5.6k RDY..P5 562J D7 Diode 152473 R24 Carbon film 220k RDY..P5 224JNL

R25 Carbon film 220k RDY..P5 224JNL TRANSFORMERS AND COILS

Symbol Description Part No. R26 Carbon film 2.2k RDY..P5 222J R27 Carbon film 470 RDY..P5 471J

T1 FM IF transformer ATE-029 R28 Carbon film 2.2k RDY..P5 222J

T2 FM DET transformer ATE-013 R29 Carbon film 4.7k RDY..P5 472J

T3 AM oscillator coi l ATB-019 R30 Carbon film 2.2k RDY..P5 222J

T4 AF RF coil ATB-020 R31 Carbon film 2.2k RDY..P5 222J

Fl FM ceramic filter ATF-018 R32 Carbon film 8.2k RDY..P5 822J

F2 FM ceramic filter ATF-018 R33 Carbon film 8.2k RDY..P5 822J

F3 FM ceramic filter ATF-018 R34 Carbon film 47k RDY..P5 473J

F4 FM ceramic filter ATF-018 R35 Carbon film 30k RDY..P5 303J

F5 AM ceramic filter ATF·027 R36 Carbon film 47k ROY..P5 473J

F6 Anti·birby filter ATF-023 F7 Anti·birby filter ATF·024

R37 Carbon f ilm 30k RDY..P5 303J R38 Carbon film 47k RDY..P5 473J

FB FM lowpass filter ATF-028 R39 Carbon film lOOk RDY..P5 104J R40 Carbon film 1.8k RDY..P5 182J

L1 RF choke coil 2.2J.tH T24-028 L2 RF choke coil 2.2J.tH T24-028 R41 Carbon film 1.8k RDY..P5 182J

L3 RF choke coil 2.2J.tH T24-028 R42 Carbon film 1.8k ROY..P5 182J

L4 RF choke coil 2.2J.tH

I T24-028

L5 RF choke coil 18J.tH ATH-007

R43 Carbon film 1.8k RDY..P5 182J R44 Carbon film 3 .3k RDY..P5 332J R45 Carbon film 3.3k RDY..P5 332J

RESISTORS R46 Carbon film 15k RDY..P5 153J R47 Carbon film 5.6k RDY..P5 562J

Symbol Description Part No. R48 Carbon film lk RDY..P5 102J

Rl Carbon film 100 RDY..P5 101J R2 Carbon film lOOk RDY..P5 104J

R49 Carbon film 100k RDY..P5 104J R50 Carbon film 560k RDY..P5 564J

R3 Carbon film lOOk RDY..P5 104J R4 Carbon film 470 RDY..P5 4 71J R5 Carbon film 150 RDY..P5 151J

R51 Carbon film 100k RDY..P5 104J A 52 Carbon film 180 RDY..P5 181J A 53 Carbon film 47k RDY..P5 473J

61

Symbol Description i Part No. Symbol Description Part No. - -- -

R54 Carbon film 330 RD%PS 331J C26 Electrolytic 4 .7 25V CEANL 4R7P 25 R55 Carbon film 22k RD%PS 223J C27 Mylar 0.047 50V COMA 473J 50

C28 Electrolytic 10 16V CEANL lOOP 16 R56 Carbon film 22k RD%PS 223J C29 Electrolytic 10 16V CEANL lOOP 16 R57 Carbon f ilm 22k RD%PS 223J C30 Polystyrene film 51 0p 50V COSA 511J 50 R58 Carbon f i lm 33k RD%PS 333J R59 Carbon film 5.1k RD%PS 512J C31 Polystyrene film 51 Op 50V COSA 511J 50 R60 Carbon film 3 .3k RD%PS 332J C32 Electrolytic 100 16V CEA101P16

R61 Carbon film 39k I RD%PS 393J R62 Carbon film 2.2k RD%PS 222J

C33 Electrolytic 1 50V CEA 010P 50 C34 Ceramic 0.0033 50V CKDY A 332J 50 C35 Electrolytic 0.1 35V CS2A OR1M 35

R63 Carbon film 100 RD%PS 101J R64 Carbon film 47 RD%PS 470J C36 Electrolytic 25V CEANL 01 OP 25 R65 Carbon film 150 RD%PS 151J C37 Mylar 0.0033 50V COMA 332J 50

C38 Electrolytic 25V CEANL 01 OP 25 R66 Carbon film 680 RD%PS 681J C39 Mylar 0.0033 sov COMA 332J 50 R67 Carbon film 1k RD%PS 102J C40 Po lystyrene film 51 Op 50V COSH 511J 50 R68 Carbon film 47k RD%PS473J

C41 Electrolytic 10V CSSA 010M 10 VR1 Semi-fixed 47k·B C92-048 C42 Electrolytic 3 .3 10V CSSA 3R3M 10 VR2 Semi-fixed 4 .7k·B ACP-018 C43 Electrolytic 0.22 25V CSSA R22M 25 VR3 Semi-fixed 150k-B ACP-014 C44 Ceramic 0.04 sov CKDYF 4032 50

C45 Ceramic 15p 50V CCDWK 150K 50

CAPACITORS . C46 Polystyrene film 41 Op 50V COSA 411J 50

Symbol Description Part No. - -

C47 Ceramic 0.01 50V CKDYA 103J 50

C48 Electrolytic 4 .7 25V CEA 4R7P 25

TC1 Film t rimmer ACM-002 C49 Ceramic 0.04 50V CKDYF 4032 50

TC2 Film trimmer ACM-002 C50 Ceramic 0.04 50V CKDYF 4032 50

TC3 Film trimmer

I ACM-002

C1 Ceramic 0.01 50V CKDYF 1032 50

C51 Ceramic 220p 50V CCDSL 221 K 50 C52 Ceramic 0.01 50V CKDYF 1032 50

C2 Ceramic 0 .047 25V CKDBC 4732 25 C53 Ceramic 0.01 50V CKDYF 1032 50

C3 Ceramic 0 .047 25V CKDBC 4732 25 C54 Ceramic 3p SOV CCDSH 0300 50

C4 Electrolytic 2 20 16V CEA 221P 16 C55 Ceramic 0.01 50V CKDYF 1032 50

C5 Ceramic 0 .047 25V CKDBC 4732 2 5 C56 Electrolytic 10 16V CEA lOOP 16

C6 Ceramic 0.047 25V CKDBC 4732 25 C57 Ceramic 0.01 50V CKDYF 1032 50

C7 Ceramic 15p 50V CCDSL 150K 50 C58 Ceramic 0.01 50V CKDYF 1032 50

C8 Ceramic 0.047 25V CKDBC 4732 25 C59 Electrolytic 0 .1 35V CS2A OR 1M 35

C9 Ceramic 0.047 25V CKDBC 4732 25 C60 Electrolytic 220 16V CEA 221P 16

C10 Electro lyt ic 0.47 50V CEA R47P 50

C11 Ceramic 0.01 50V CKDYF 1032 50

C12 Ceramic 0.047 25V CKDBC 4732 25 C13 Ceramic 0.047 25V CKDBC 4732 25

C61 Electrolytic 47 16V CEA 470P 16 C62

I Ceramic 0.047 25V CKDBC 4732 25

C63 Ceramic 47p 50V CCDSL 470K 50 C64 Ceramic 0 .01 50V CKDYF 103Z 50

C14 Ceramic 0.047 25V CKDBC 4732 25 C15 Ceramic 0.01 50V CKDYF 1032 50

OTHER

Symbol Description Part No. C16 Ceramic 0.01 50V CKDYF 1032 50 1-C17 Ceramic 0.01 50V CKDYF 1032 50 Reed relay ASR-005

C18 Ceramic 0.01 50V CKDYF 1032 50 C19 Ceramic 0.047 25V CKDBC 4732 25

C20 Ceramic 390p 50V CCKSL 391 K 50

C21 Ceramic 390p 50V CCDSL 391 K 50 C22 Ceramic 150p 50V CCDSL 151 K 50 C23 Electrolytic 10 16V CS2A 100M 16 C24 Electrolytic 47 16V CEANL 470P 16 C25 Electrolytic 470 16V CEA 471 P 16

12.6 DE-EMPHASIS SWITCH ASSEMBLY (AWX-099)

AWE-068, No.1

AWE-068, No.4

AWE-068, No.5

AWE-068, No.2

1 2 r-J-• o

0 N

i-15,us

I L_----=-:__1 SOP

Parts List of De-emphasis Switch Assembly (AWX-099)

SWITCH


Sl Slide switch (DE-EMPHASIS) ASH-015-0

CAPACITORS


C1 Mylar 1200p 50V COMA 122J 50 C2 Mylar 1200p 50V COMA 122J 50

C3 Ceramic 15()p 50V CCDSL 151 K 50

SX-1250

I

_ _j

4 C2 1200P C3 150P o-H--o o-tt-o

00 S1 3

l ."~

I 00 ~ 0

2 ~ 00 0

1 -oo --''/"

o--tt-o C1 1200P

63

1 2 3

12.7 EQUALIZER AMPLIFIER ASSEMBLY (AWF-021)

A A

'7 IC

a J

B 8

B :::s:: ' <::i "' 0::

~ :-L C) C)

C) C)

c N .r 3 c 1 0:: a:::

2

4

Q,-vQ4 2SA126S Q l3 2SA850 Q5 "-' c: s 2SC11'lSA Q·4 2SA628A C= .·o 2SA8'12A c1--.4 1S2413 I

Q, 1 2SC1135 Ds.s WZ-240 _ _j (;:12 2SC869 0 0

1 2 3

64

A

-B

c

•

D

SX-1250

1 I 2 I

R31 4-7 f\z9 47 o---J\NI.r---0 o---J\NI.r---0

c113.J/SQ c25 22/ IG 49

V0.1 2SC1775A O.s 2SA672A O.to 2SA87'2A 0-8 2SC1175A

~20K~ lc301~t90~9~BiV( o------o4qv ~wo':I8~C3t 3r.

~ + b'l20;~'=fl~ .... ..!, 'f' O.GV 0 GV'¥ ~ ~'f.'2~/ 16 b+ R33 56 0 1 tS2473x2 D2 D4 ln473x2 D3 o.GV ~ o .,. o o .,. o o I~ R

26 o220

o Ioiii 0

o-.t ~ C23 ~ o---J\/V\r---0 ~? R2s220

R21 75K R21 680 o--------~ R2s o----J\N\r----0 ~

~ c c-z2 680 R23'39K ~ 47~p_3;-ft--o 410p>-l t--o c Q ~

1 C9 Ct6 tOP . O~V . .I. Cto o-t ~ 0 GV Q.G J 3500P

3

Czs 221!6 Cts 3.3/50 o-ft-<> o-ft-<>

+R36220K + o---J\NI.r---0

R34 56 C>---1\/V'v---<

C?A o-tt-o 0.0047 ~

R22 75K o----'\11/'v--

R?A 39K

0

+ en b3500P o~&b(Qsv • 2SC1775A o---f:J--<> .t Rst'o?K Rt5 Q.s ~ • • - 4& sv > Rts > Rts

220/63 ,. 75K ........, r-v 75K -,. 9101< 2.SCI775A Ct6 lOP

1

+ Czs 0 h

220/63

c R,, l c1 cs 220 R40 120 b lOOOP r lOOOP

~ o---JVVv----0 Ctt + + C12 ~ R4t SlK Ct3 27P o-ft--o o--ft-<> Ct4 27P

' o----J\Nv-----0 o-1 J-o 410/6.'3 470/6.3 o-Il-<> R37

~ ~ R13 1.54K R14 1.54K RB 4.7K R43 4.1 K ov o-------IV\I'v- o-------1\1\/v- OV120K

o-----'\/Vv--0 < ~ Q. 2SA72!4~ \ W!-21' • ~21A726S ~

C29 Ds • o---J\/V\r---0 ~ • ~ R7 0. 6V Rn l K Rt2 IK 4&5V 0.6V

R2o' 9 2?0

ZR39 • 47K R3s

47K

t~~-14~ O. GV 100/35 I 100/35 t20l< ~ o---J\/V\r---0 o---J\111\r---0 ~

49V 24V ~ 5V Q.l R9 4.7K Rto 4.7K Q.2 <

Q. ~12 c fN2SA7~ ~726SfN , o-t J-<> R5 2.2.K R6 2.2K o--1 t-o

49 sv 24 6V c3 47p ~ o-----1\N'v---- C4 47P "''A.~ ... 2SC1735 2SCS69 R3 lOOK R4 lOOK ~ o--1 t-o G---J\N'v---0 o------JIN'v--- <>-f t-o

R44 150 Cs 6SP Rt tOOK R2 tOOK C6 68P o---J\/V\r---0 o II o o 1 1 o

R46 tSK Ct 1 C2 1

10 -o

9 (

8 7 ~

6 Q

%,

5 Q

~%

4 Q

3 Q

2 0

2SA6Z8A 2SA850 ~

R40 150

~ R47 15K

1 0

AWS-094, No.19 ~AWS·094, No.20

AWH-048, No.3 AWH-048, No.2

AWM-091, No.1 AWR-106, No.13

AWR· 106, No.ll AWG-042, No.1 0

AWG -042, No. 11 AWS-094, No.23

AWS-094, No.29

1 I 2 ~ 3

A

B

•

c

-D

65

Parts List of Equalizer Amplifier Assembly (AWF-021)

SEMICONDUCTORS

Symbol Description Part No. Symbol Description Part No. 1--

01 Transistor 25A7265·G R26 Carbon fi.lm 220 RDY.PS 221J

02 Transistor 25A7265-G R27 Carbon film 680 RDY.PS 681J

03 Transistor 25A7265-G R28 Carbon film 680 RD%P5 681J

04 Transistor 25A7265-G R29 Carbon film 47 RDY.P5 470J

05 Transistor 25C1775A·D R30 Carbon film 47 RDY.P5 470J

06 Transistor 2SC1775A·D R31 Carbon film 47 ROY.P5 470J

07 Transistor 25C1775A·D R32 Carbon film 47 RO%P5 470J

08 Transistor 2SC1775A·D R33 Carbon film 56 RDY.PS 560J

09 Transistor 25A872A·D R34 Carbon film 56 RDY.P5 560J

010 Transistor 25A872A-D R35 Carbon film 220k RD%P5 224J

011 Transistor 25C1735-D R36 Carbon film 220k RDY.P5 224J

012 Transistor 2SC869·C R37 Carbon film 4.7k RDY.P5 472J

013 Transistor 25A850·D R38 Carbon film 47k RDY.PS 473J

014 Transistor 25A628A-C R39 Carbon film 47k RDY.P5 473J

R40 Carbon film 120 RDY.P5 121J

01 Diode 152473

02 Diode 152473 R41 Carbon film 51k ROY.PS 513J

03 Diode 152473 R42 Carbon film 47k RD%P5 473J

04 Diode 152473 R43 Carbon film 4.7k RDY.P5 472J

05 Zener diode WZ-240 R44 Carbon film 150 RD%P5F 151J

R45 Carbon film 150 RDY.P5F 151J

06 Zener diode - WZ-240 R46 Carbon film 15k ROY.PS 153J

R47 Carbon film 15k RO%P5 153J RESISTORS

Symbol Description Part No. CAPACITORS

R1 Carbon film 100k RD%P5 104JNL Symbol Description Part No. R2 Carbon film 100k RD%PS 104JNL

R3 Carbon film 1 OOk RD%P5 104JNL C1 Metallized mylar 1 100V ACE-008

R4 Carbon film lOOk RD%P5 104JNL C2 Metallized mylar 1 100V ACE-008

R5 Carbon film 2.2k RD%P5 222J C3 Ceramic 47p 50V CC05L 470K 50

C4 Ceramic 47p 50V CCD5L 470K 50

R6 Carbon film 2.2k RD%P5 222J C5 Ceramic 68p 50V CCD5L 680K 50

R7 Carbon film 120k RD%P5 124JNL R8 Carbon film 120k . RD%P5 124JNL C6 Ceramic 68p 50V CCDSL 680K 50

R9 Carbon film 4.7k RD%P5 472J C7 Polystyrene film 1000p 50V C05A 102F 50

R10 Carbon film 4.7k RDY.P5 472J C8 Polystyrene film 1000p 50V C05A 102F 50

C9 Polystyrene film 3500p 50V C05A 352F 50

R11 Carbon film lk RD%P5 1 02J C10 Polystyrene film 3500p 50V C05A 352F 50

R12 Carbon film 1k RD%P5 102J

R13 Metal film 1.54k 'hW RN'h5R 1541F C11 Electrolytic 470 6V CEA471P6

R14 Metal film 1.54k 'hW RN'h5R 1541 F C12 Electrolytic 470 6V CEA 471P 6

R15 Metal film 75.0k '!.W RN'hSR 7502F C13 Ceramic 27p 50V CCD5L 270K 50

C14 Ceramic 27p 50V CCD5L 270K 50

R16 Metal film 75.0k 'hW RN'!.SR 7502F C15 Ceramic 10p 50V CCD5L lOOK 50

R17 Metal film 910k 'hW RN'h5R 91 03F R18 Metal film 910k '!.W RN%5R 9103F C16 Ceramic 10p 50V CC05L lOOK 50

R19 Carbon film 220 RD%P5 221J C17 Electrolytic 3.3 50V CEANL 3R3P 50

R20 Carbon film 220 RDY.PS 221J C18 Electrolytic 3.3 50V CEANL 3R3P 50

C19 Mylar 0.0018 50V COMA 182K 50

R21 Carbon film 75k RD%P5 753JNL C20 Mylar 0.0018 50V COMA 182K 50

R22 Carbon film 75k RDY.PS 753JNL R23 Carbon film 39k RD%P5 393J C21 Ceramic 470p 50V CKDYB 471 K 50

R24 Carbon film 39k RDY.PS 393J C22 Ceramic 470p 50V CKDYB 471 K 50

R25 Carbon film 220 RD%P5 221J C23 Mylar 0.0047 50V COMA 472K 50

66

BX-1250

Symbol Description Part No. 1-- --- - -

C24 Mylar 0.0047 50V CQMA472K 50 C25 Electrolytic 22 16V CSZA 220M 16

C26 Electrolytic 22 16V CSZA 220M 16 C27 Electrolytic 220 63V CEA 221P 63 C28 Electrolytic 220 63V CEA 221P 63 C29 Electrolytic 100 35V CEA 101P 35 C30 Electrolytic · 22 16V CSZA 220M 16

C31 Electrolytic 22 16V CSZA 220M 16 C32 Electrolytic 100 35V CEA 101 P 35

67

12.8 FUNCTION SWITCH ASSEMBLY (AWS-094)

~6 100 '5 ~------------------~AAr--------------<) '6 14 ~~----------------------------~------_.

1l

450---------------------------+-+-------~

440------------,--------------~~--~--~ 1 8 o------------"vVv----0 26 o------.

·s o---------~~~

21 28 230---------~--~-+----~-----+~ 20 0---------~---+~

24 o-------+~rvv-+--1-0

2'7 C>-----... 28 0----~~~~---.~

R 1J00

31 33 ~---------,

34o------' 3So---------------~ 30 u-------------~

36G-----------------~-

3~ o---------D

3S u----------------o 38o----------() 41 o------------~~-+-+~

22 43 4{) 42

Parts List of Function Switch Assembly (AWS-094)

Symbo l Description Part No .

S1 Push switch (FUNCT ION) ASG-095

R1 Carbon film res1stor 100 RD!4PS 101J

R2 Carbon film reSIStor 100 RDY.PS 1 01J

R3 Carbon film res1stor 100 RDY.PS 1 01J R4 Carbon f ilm res1stor 100 RDY.PS 101J R5 Carbon fi lm res1stor 100 RDY.PS 101J R6 Carbon film res1stor 100 RDY.PS 101J

C1 Electrolyt ic capaci tor 220 6V CEA 221P 6

68

r-----012

SX-1250

1 2 3

A ~ PL8 (AM)

A

AWR-106, No.8 ~ PL9 (FM)

AWS-095, No.9

c 1 @ PL10(PHONO 1)

2 ,....

4 ,.... 0 3 @) PLII (PHONO 2) 0!)

6 0

B

r-8 ~ 0 7 @ PL12 (AUX)

R6 100 u ~

I I ~ 10 0 -@ AUX (R) 12,.... 011

~ 0 ~ 0

I ~'>WG -042, No.18

013 *' ~'>WX-097, No.6 ~ 0 ~ 0

AUX 15 014 @) AUX (L) <>----'IN\r---0

Rs 100 R• 100 016 /\WF -021, No.7 ~ r r----+AWF-021, No.4 18 017

i..,i 0 i..i 0 ~ 0

I WX-097, No.7 c 19 ~ 0 ~ 0 ~ 0 20,.... WF-021 , No.1

B

PHONO 2 R3100 0<::1 r::::WE-068, No.41 ~ ~ 23 022 ~

I § PHONO 1 (L) R2 100 024

0 i..i

I~ -@PHONO 1 (R) ~ 0 ~ 0 25 v

026 "WF-021, No.6 ~ 0 ~ 0 ~ 0 r-; PHONO 1 28 9 027 AWX-097, No.5

029

c c

300 t WF -021, No.lO a...i 0 ,11,-i 0 i..i 0 li.....a 0

l <p1

~TUNING METER

~ 0 ~ ~ - 33 9 C?32 ."-" .1lWE-068, No.34 0 0 0 0 0

FM ~34 WE-068, No.35

935 ~AWR-106, No.9

~AWE-068, No.15 371 <[36

i..,i 0 i....a 0 .a...i 0

I @ PL 13 .li.WE-068, No.7

~ 0 ~ ~ 39 a <1 ~tl AWE -068, No.10 0 0

A t-1 ~40 AWE -068, No.33

L-... + C1

42 o_ <?41 ~AWE-068, No.37

~ ~ 0\ SIGNAL METER 220/6 44 0 1--

045 l +~ C14 1 --- 100/6

AWE-068, No.17 AWG -042, No.28

· /\WE-068, No.22 AWM-089, No.3

AWE-068, No.19 AWG -042, No.26

· ~'>WM-089, No.6 D D

~'>WE -068, No.18

1 2 3

69

A

B

c

D

70

1 2

12.9 FLAT AMPLIFIER ASSEMBLY (AWG-042)

<> I

"

G; "' .

r-----1 , Ul C"ll -...,II

"' <• c

> ,, n 10') ~ " • <t

I

I <..) (/)

I N

I a C'"r p .... '"-' <( I ~L

,~~ " ' ' I >'l-" ;?• > ''r r N

I ._,,

a i'

> ,,

;II tJ~~

' ·<

,, '" "-(~ ~ ,'<J

Ill J '" " ~

tl "' -T:

~~~ I

'" J "' .... '" ._, N

/

X X <• " rt

1 2

oo G

' 0

T u

i--l • t""" ,, <t In N

3

A

B

c

D

3

A

-B

-c

D

Rt6 47K

0 0

l [

SG

1 I

AWR -106, No.10

AWE-068, No.39

AWR-1 06, No.14

AWM-091, No.3

1 I

2 I

~AWG-041, No.2

8

~ AWM-089, No.11

,----+ AWM·089, No.14

2

VR2 50K

r--r AWG-041, No.9

9

C16 330P o-U--o

o-tt-o 0 0 Ci5330P

1

~~ .~,~ s, n

I

SX-1250

3 I 4 I 5

AWX-062, No.1+------.

I 6

AWX-062, No.6+--------,

TAPE 2 REC (R)@'---...

AWS·094, No.44+-----,

TAPE 1 REC (R) @----

AWS·094, No.45 r--

TAPE 1 R EC ( L)@-t-----------.

TAPE 2 REC (Ll@------.,

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 @ (Rl OUT (L) PLAY (R)

ADAPTOR OUT (R) ~ r-.DAPTOR TAPE 2 (Q) .J.,. IN (L) PLAY (L .....__.

AWF-021 , No.~ @ ©

AWF -021, No.2-----.

12 13 15 20 22 24 25 26 27 28 29

R7 'lSA872A 1 'lSA872A 'lSCl775~ 4.71< 2SC1715A Q.4 0 GV Cs Q.:~ ll..1

3

3~~ f i:: :7 ~~ t ! r~~f fR~s 470 RT3 f f lK 4 RiB 1K 3 lK <>--M-o ", a I~ o Rg o02 ~I o J l.lK o -.01 o 330K

152473 • 2 ~~K IS2473 ~ 2 0 0 0 13 14 15

0 0

] [

C7 + o---f.l---o

330/63 LL, r I

0

][ 0 l~;: 1 1

1 c r o12

t~· Cs ~

330/63 W-1 VR1 lOOK ( HS)

0

lt 0

r-r--1

I 4 I

0 0 0 17 18 19

0 0

5

250

~~KJ o23r

0 0 0 26 20 21 22 0

0 0

~ ~ 2~f l [ 2\3K

I

0 0

l [ 0 0

] [ 0 0

l [ 0 0

] [ s,

6

o27

lR2 r·2K

28 0

29 0

R4 2.2K

A

•

B

•

c

D

72

Parts List of Flat Amplifier Assembly (AWG-042)

SEMICONDUCTORS

Symbol Description Part No. Symbol Description Part No. --

Q1 Transistor 2SC1775A-E R21 Carbon film 47 RD%PS 470J Q2 Transistor 2SC1775A-E R22 Carbon film 47 RD%PS 470J Q3 Transistor 2SA872A·E R23 Carbon film 6.2k RD%PS 622J Q4 Transistor 2SA872A-E R24 Carbon film 6.2k RD%PS 622J Q5 FET 2SK30AW·Y R25 Carbon film 47k RD%PS 473JNL

Q6 FET 2SK30AW-Y R26 Carbon film 47k RD%PS 473JNL Q7 Transistor 2SA725-G R27 Carbon fi lm 2.7k RD%PS 272J as Transistor 2SA725-G R28 Carbon film 2.7k RD%PS 272J

R29 Carbon film 820k RD%PS 824JNL D1 Diode 152473 R30 Carbon film 820k RD%PS 824JNL D2 Diode 152473 D3 Diode

I 152473

D4 Diode 152473 R31 Carbon film 100 RD%PS 101J R32 Carbon film 100 RD%PS 101J R33 Carbon film 130k RD%PS 134JNL R34 Carbon film 130k RD%PS 134JNL

SWITCHES R35 Carbon film 1.2k RD%PS 122J

Symbol Description Part No. R36 Carbon film 1.2k RD%PS 122J

51 Lever switch (DUPLICATE) ASK-084 R37 Carbon film 22k RD%PS 223J

52 Lever switch (MONITOR 1) ASK-092 R38 Carbon fi lm 22k RD%PS 223J

53 Lever switch (MONITOR 2) ASK-092 R39 Carbon film 8.2k RD%PS 822J

S4 Lever switch (ADAPTOR) ASK-092 R40 Carbon film 8.2k RD%PS 822J

55 Lever switch (MODE) .

ASK-090 R41 Carbon film 75k RD%PS 753JNL

S6 Lever switch (MUTING) ASK-090 R42 Carbon film 75k RD%PS 753JNL

57 Lever switch (LOUDNESS) ASK-090 R43 Carbon film 10k RD%PS 1 03J R44 Carbon film 10k RD%PS 103J R45 Carbon film 3.9k RD%PS 392J

RESISTORS

Symbol Description Part No. R46 Carbon film 3.9k RD%PS 392J R47 Carbon film 22k RD%PS 223J

VR1 Variable ( 1 OOk·HB BALANCE) ACV-163 R48 Carbon film 22k RD%PS 223J

VR2 Variable (50k-B2 VOLUME) ACV·169

R1 Carbon film 2.2k RD%PS 222J CAPACITORS

R2 Carbon film 2.2k RD%PS 222J Symbol Description Part No. R3 Carbon film 2.2k RD%PS 222J R4 Carbon film 2.2k RD%PS 222J C1 Metallized mylar 1 100V ACE-008

R5 Carbon film 2.2k RD%PS 222J C2 Metallized mylar 1 100V ACE-008 C3 Metallized mylar 1 100V ACE-008

R6 Carbon film 2.2k RD%PS 222J C4 Metallized mylar 1 100V ACE-008

R7 Carbon film 4.7k RD%PS 472J C5 Ceramic 0.01 500V CKDYF 1032 500

R8 Carbon film 4.7k RD%PS 472J R9 Carbon film 330k RD%PS 334JNL C6 Ceramic 0.01 500V CKDYF 1032 500

R10 Carbon film 330k RD%PS 334JNL C7 Electrolytic 330 63V CEA 331P 63 C8 Electrolytic 330 63V CEA 331 P 63

R11 Carbon film 330k RD%PS 334JNL C9 Electrolytic 22 16V CS2A 220M 16

R12 Carbon film 330k RD%PS 334JNL C10 Electrolytic 22 16V CS2A 220M 16

R13 Carbon film 1k RD%PS 102J R14 Carbon film 1k RD%PS 102J C11 Electrolytic 22 16V CS2A 220M 16

R15 Carbon film 1k RD%PS 102J C12 Electrolytic 22 16V CS2A 220M 16 C13 Mylar 0.22 50V CQMA 224J 50

R16 Carbon fi lm 1k RD%PS 102J C14 Mylar 0.22 50V COMA 224J 50

R17 Carbon film 1.1 k RD%PS 112J C15 Ceramic 330R 50V CKDYB 331 K 50

R18 Carbon film 1.1 k RD%PS 112J R19 Carbon film 47 RD%PS470J C16 Ceramic 33()p 50V CKDYB 331 K 50

R20 Carbon film 47 RD%PS470J C17 Metallized mylar 1 100V ACE-008

73

Symbol Description Part No. f-- - -

C18 Metallized mylar 1 100V ACE-008 C19 Ceramic 56p 50V CCDSL 560K 50 C20 Ceramic 56p 50V CCDSL 560K 50

C21 Electrolytic 100 10V CEANL 101P 10 C22 Electrolytic 100 10V CEANL 101P 10 C23 Ceramic 68p 50V CCDSL 680K 50 C24 Ceramic 68p 50V CCDSL 680K 50 C25 Ceramic 10p 50V CCDSL 1 OOF 50

C26 Ceramic 1()p 50V CCDSL 100F 50 C27 Electrolytic 220 16V CEANL 221 P 16 C28 Electrolytic 220 16V CEANL 221 P 16 C29 Ceramic 0.04 50V CKDYF 403Z 50 C30 Ceramic 0.04 50V CKDYF 403Z 50

C31 Electrolytic 330 35V CEA 331P 35 C32 Electrolytic 330 35V CEA 331P 35

OTHERS

Symbol Description Part No .

. Screw ABA-116 Union nut ABN-021 Washer faced nut ABN-024

7 4

12.10 5P CONNECTOR ASSEMBLY (AWX-062)

L REG

::s:: ::s:: 0 9 .., a:

I

L_ 6 R I<EC

~ 0 1 Ro 390K -~ 0

)3 lOOK ......, '- I\) ,J. \ 0,... 1 I CJ

I \ ~ 0 0 I I ~ l 'o 10"

0 .... -o- , 0~ R•lOOI\ ~ ~(J)

~on. R2 3901<. r

Parts List of 5P Connector Assembly (AWX-062)


R1 Carbon folm resistor 390k RDY.PS 394J R2 Carbon film resistor 390k ROY.PS 394J R3 Carbon folm resistor 100k RDY.PS 1 04J R4 Carbon film resistor 100k RDY.PS 104J

Connector socket 5p (REC/PLAY) AKP-007

2

~ ...,

@

@

I

_j 5 4 R PB E

AWG-042, No.24

TAPE 2 REC (L)

AWG-042, No.17

TAPE 2 PLAY (L)

AWG-042, No.19

TAPE 2 PLAY (R)

AWG-042, No.29

§) TAPE 2 REC (R)

SX-1250

75

'\) m

....

N

w

9

10

2

0 (") ro l> ~

!'J ~

~

(")

0 2 -i .... ::D 0 r l>

3 :f: 4

"'C r "TT

m ::D )> Cl) Cl)

6 m :f: ro r -<

'7 -)> -zsv ~ 8 G') I N

6 ~ ~ -

5

Q1 2SC1312 C4s Q, 2SC1312 ' ro1ss ~ 13V R41 2SV . VR1-a (13 ~ 1& VR2 -o. C23 ::; ~ 2 2K

R3 102K Rs ?.2!25 ~ u:> R 21 102.6 K R21 2 2/~ c...- <..D >--< 1..1) 4'1KI Cs c~ 14'1K ~... 1.SV 24K'I C21 C23 124K ~,. l .SV Sl-a I ~

I r- ~ 7::(1 t~ Cis 12P Y' -,~~ c3112P C3s ( •g · _ ; c-, - . 0.056 0056 r-n:- c," 0.018 0.018 · ~1-- 22 , 25 r<: • · 1

u ' '<1- ~ - 1-'i '< ·-,;_ ,.... -

Cjo1 S..3+ ~~ ~ c~ -4.1v [O 0

•221 25 cfs>( r21j.?./2S -4.1V(7' +- 3 .,. ~ /2 CL \ ~' 1 "" ""' QJ y R 45 1 K '0/25 4.'7 5 ... C> Yi/25 ~ 5 ~ .,~;-' + :::.:: ~ ~ c.:)L.J>.J\,1\·f\r-"-t-~----t-<.)

~ u~I~ g ~ -47V "'~Ijg g "' a a..J 1 -<

0e> Rs R11 33K ~ ;> · o Rz3 11K '-' o R29 11 K ~ -4.7V w 0

cr. ,.... :"" > X n• - ::.:_ ~~:o ~ "'if c- 1' < 33vK VR 3 o. .., ,: ~... .,. c-:6 VR4-0. "' ;;; ~ ~.... ~+ <:::: r ~o + "7'-T R43 102K cl:. a;: =-.i u;:? 39K a:: cr. (Y -.1' u g uo 01 .~ 2 K

>-t j T I R ! ~ ~ 44 A

,.. 5 Rc; VRJ-b R12 g~ ~ ; t~t3'~ Rz411K vR4 -b R30 11K §~ ~;.~J,~ yJ~.:z "'1~ 2· 2 r< l C:: C> - ~~ ~ v· ~ "'~ 0 0 0 + ~~Tl; 1

I c >- 33K a.:- r 33K r~ ~ T~ -~ ~ ,.... ~ --<...> ~ 44 c4 ~~.L r :! ~ ~ ~l. c::> ~ ..,.I ~ 0 R4; 'K

10/25 4.'7/25 u~ V2'J.2125 o:: rr. f It"' Q1. ~'T"g C~8 cr cr_lf ,.7'' Q.; r:_ r...J\/\·f\r-"-1----+----+---<J

... ..... + ~ \ .,_,_, + ~ i\ ' c + ,;;+ "" ~ ~ ~o "' x: 2.2/25 1 ~ ;!; S' - o

"''" N Cr; !Y oo Ca C1s + ""'· Cn oc ° C3? +.~ ~ w I u·~·c:: 0 056 0.056 ---('=::- 2.2/25 0.018 - (~4Q.Q18 ~1- 2·2f2S ~.~ ..,__ I

- ._ v rl' fh 12P ;::.:: .... f• 'h 12P < u•~g -""" 1 . 1 C~ R22 1 . 1 R2a CJ.,o -

::!. _.... ... .X: + ~ R4 VR,-b R10 2.2/25 ;3 co 24K VR2-b 24K 2.2/25 ~ro 4'7K 4'7K a:: c.ci a:::<.D R4z

I C46 ft ftoo I Y l ~ -----

__ j Q4 2SC1312 Q2 2SC1312

w

_j 0 (") ro l>

'-l '-l

~ ·

J

N

~

w

0 T ("') .. )> )> )> )> :E :E :E :E )>

:2: ~ ~ ~ ~ G) 6 6 6 6 6 0) 0) 0) 0)

CD CD CD CD .;.. . . . ' .

.rv z z z z z ~ ~ 0 0 0 ..... ..... ..... ..... i::o w 0) 0) I'V

I I I I I

~

b1 0 2 ~ 3 o b4 b5 b6 b7 o8

CD

R4> UK o---'INV----<>

I

)> :E G)

6 .;.. I'V . z 0 (o

I

:t---

69 10 0

!

•,tc.o +l CJt ! '00116 1' .. ~'

~UK I 1~ 1~ ~;'K ~~UK ~ !!410Pr*470P! ~ l i~>2SC1312 fJ~f::,'K ,~ f::o• ~ Jit~> IOIZ5 l 1 Rl7 X...~ 7V 1 ~~~ UK

~ r l i •1':/1) :~K9. ~ :K :: ~ C3:+ ~e~ ·~4!V r~~/Z5 c,,2, l en ~ +rc .. !+

.J11115 c, 47115 z.Z/7.5

~. i ' l2lOKi tooK I'8K1H/;,1 ~ tiOOt<! ! r-~l ·Sv-:1' X"' + ~2~5__ ___ --~--s-~ C1i C.. T C2 1SC1312 1.1125 _ -- -~ Rl$10K Re S.ZK

Q. J tzP OJ68~ + +47/!ti 9 - ---- R22ZAK --- ~--A- o----1\1\/'v--0 9

)>

-

•len •J,c, 1'100/16 J 100iK

l c11

t I ·1'100/lo f Ru R10 I. 5V 4R;~ lOOK 221)1(1~

fz~ b o~ 7 ' j SV R3oi1K .a. •+ cliO ~·- ~ -·----1- Rta24K . ca

2SCI3 ~ c12 • • c.. o---'1/1/V--<> _ 1c,- 22125 -- • en o--JVVv----0 Roo 47K T on56 ~131~ 4. 1V o-f 1-<> o-f 1-<> o-ff--<> ~ I r· - a - - - -lf • .-tr~ --- 00022 - _·. --- • - - . O.ol8 r ~~:..., ~~..... ~':.... o----A.Nv----<> o-f~ w ''"'-·-f;.-rr -u 1-- -r ~ ] [ ; ·w .... ~m w Co 0.056 C1 MS6

Lj;_J I~~h . LJ._J f f:t M lJ_J !J' LJ._J .__ ________ .;;10;.:2.;;K;::.n.:.......J I I ~OP 99K.Q. s , IOZ.6K.n. f I 1021\Jl.

0 -.- ("') .. CD T )>

I ~

~

N

.. w

m )( I ~

IU 01 0

Parts List of Control Amplifier Assembly (AWG-041)

SEMICONDUCTORS

Symbol Desc.ription Part No. Symbol Description Part No.

01 Transistor 2SC 1312-G R34 Carbon fi lm 220k RD Y.PS 224JNL

02 Transistor 2SC 1312-G R35 Carbon fi lm 4.7k R DY..PS 472J

03 Transistor 2SC 1312-G 04 Transistor 2SC1312-G R36 Carbon film 4.7k RDY.PS 472J

R37 Carbon f ilm 6.8k RD Y.PS 682J R38 Carbon fi lm 6.8k RDY.PS 682J

RESISTORS AND POTENTIOMETERS R39 Carbon fi lm l OOk RDY. PS 104J

Symbol Description Part No. R40 Carbon f ilm lOOk RDY.PS 1 04J

VR1 Variable res istor R41 Carbon fi lm 2.2k RDY.PS 222J

(1 02k, 5·step, BASS 50Hz) ACV-165 VR2 Variable resistor

R42 Carbon film 2.2k RDY.PS 222J R43 Carbon film 2.2k RDY.PS 222J

( 1 02.6k, 11 -step, BASS 1OOHz) ACV-166 VR3 Variable resistor

R44 Carbon f ilm 2.2k RDY.PS 222J R45 Carbon film 1k RDY.PS 102J

(1 02k, 5-step, TREBLE 20kHz) ACV-168 VR4 Variable r esistor R46 Carbon film 1k RDY.PS 102J

(99k, 11 -step, TREBLE 1OkHz) ACV-167

R1 Carbo n film lOOk RDY.PS 104J CAPACITORS

R2 Carbon f ilm lOOk RDY.PS 104J Symbol Description Part No. R3 Carbon film 47k RDY..PS 4 73J R4 Carbon film 47k RDY.PS 473J Cl Electrolytic 4 .7 25V CSZA 4R7M 25

R5 Carbon f ilm 33k RDY.PS 333J C2 Electrolytic 4.7 25V CSZA 4R7M 25

- C3 Electrolytic 4 .7 25V CSZA 4R7M 25

R6 Carbon film 33k RDY.PS 333J C4 Electrolytic 4.7 25V CSZA 4R7M 25

R7 Carbon film 8.2k R DY.PS 822J C5 Mylar 0.056 50V COMA 563J 50

R8 Carbon film 8 .2k RDY.PS 822J R9 Carbon fil m 47k RDY.PS 473J C6 Mylar 0.056 50V COMA 563J 50

R10 Carbon film 47k RDY.PS 473J C7 Mylar 0.056 50V COMA 563J 50 C8 Mylar 0 .056 50V COMA 563J 50

R11 Carbon film 33k RDY.PS 333J C9 Polystyrene 390p 50V COSA 391J 50

R12 Carbon film 33k RDY.PS 333J C10 Polystyrene 390p 50V COSA 39 1J 50

R13 Carbon film 100k RDY.PS 104JNL R14 Carbon film 100k RDY.PS 104JNL C1 1 Electrolyt ic 2.2 25V CEAN L 2R2P 25

R15 Carbon film 220k RDY.PS 224JN L C12 Electrolytic 2.2 25V CEANL 2R2P 25 C13 Electrolytic 2.2 25V CEAN L 2R2P 25

R 16 Carbon film 220k RDY.PS 224JNL C14 Electrolytic 2.2 25V CEANL 2R2P 25

R17 Carbon film 4.7k RDY.PS 472J C15 Cerarylic 12p 50V CCDSL 120K 50

R18 Carbon film 4.7k RDY.PS 472J R19 Carbon film 6.8k RDY.PS 682J C16 Ceramic 12p 50V CCDSL 120K 50

R20 Carbon film 6.8k RDY.PS 682J C17 Electrolytic 100 10V ACH -3 12 C18 Electrolytic 100 10V ACH-3 12

R21 Carbon film 24k RDY.PS 243J C19 Electrolytic 2.2 25V CEAN L 2R2P 25

R22 Carbon f i lm 24k RDY.PS 243J C20 Electro lyt ic 2.2 25V CEANL 2R2P 25

R23 Carbon film 11 k RDY.PS 113J R24 Carbon film 11 k RDY.PS 113J C21 Mylar 0.018 50V COMA 183J 50

R25 Carbon tilm 10k RDY.PS 103J C22 Mylar 0.018 50V COMA 183J 50 C23 Mylar 0.018 50V COMA 183J 50

R26 Carbon film 10k RDY.PS 103J C24 Mylar 0.018 50V COMA 183J 50 R27 Carbon film 24k RDY.PS 243J C25 Ceramic 2200p 50V CKDY A 222J 50 R28 Carbon fi lm 24k RDY.PS 243J R29 Carbon f i lm 11 k RDY.PS 11 3J C26 Ceramic 2200p 50V CKDY A 222J 50 R30 Carbon film 11 k RDY. PS 113J C27 Electrolytic 2.2 25V CEAN L 2R2P 25

C28 Electrolytic 2.2 25V CEAN L 2R2P 25 R31 Carbon film l OOk RDY.PS 104JNL C29 Electrolytic 2.2 25V CEAN L 2R2P 25 R32 Carbon film 100k RDY.PS 104JN L C30 Electrolytic 2.2 25V CEANL 2R2P 25 R33 Carbon film 220k RDY.PS 224JN L

78

SX-1250


C31 Ceramic 12p 50V CCDSL 120K 50

C32 Ceramic 12p 50V CCDSL 120K 50 C33 Electrolytic 100 10V ACH-312 C34 Electrolytic 100 10V ACH ·312 C35 Electrolytic 2.2 25V CEAN L 2R2P 25

C36 Electrolytic 2.2 25V CEANL 2R2P 25

C37 Electrolytic 100 16V ACH ·31 1

C38 Electrolytic 100 16V ACH·31 1

C39 Electrolytic 100 16V ACH-311

C40 Electrolytic 100 16V ACH-311

C41 Ceramic 470p 50V CKDYB471K50 C42 Ceramic 470p 50V CKDYB471K50

C43 Electrolytic 10 25V CSZA 100M 25

C44 Electrolytic 10 25V CSZA 100M 25 C45 Mylar 0.068 50V COMA 683J 50

C46 Mylar 0.068 50V COMA 683J 50

OTHERS


Lever switch (TON E) ASK-090 Washer faced nut ABN·024

79

A

B

c

D

so

1 2

12.12 FILTER AMPLIFIER ASSEMBLY (AWM-089)

MUT IN

G

Input R

15

17

16

J-o I c'l Cs L_OI

MUTOUT 2 4 3

3

'7 5

13 ~------~----~~DT8

I 25V 14

11_)-----{ 10 Output L

3 I 11 -B 12 -2.5V

8 Output R

I

-~ SWITCHS TRANSISTORS

sl LOW FILTER Ql , Gz 2.SC1313 x 2 Sz HIGH FILTER ( 2SC1345 ) s3 MULTI PATH s4 FM MUTING

1 2 3

A

B

c

D

I

A

-B

-c

-D

1 I 2 I

.--------------------+==:;-----+AWE -068, No.38

1 ! lr-

2

-f-----+ AWE-068, No.14

R.&:lO~

O 1.------+AWS-094, No.42

3 o-- --l!---1 J AWE-068, No.40 ,..,4 D---+----' 1,----~ A WE -068, N o.42

5 o-- -t---' 6 1,-----+ AWS-094, No.40

o--t----' 7 '"'0-- --l-----+ AWE-068, No.36

l. PRE OUT (R) 8

09

- ~ 10 ~ ~ G. PRE OUT (L) ~~•• _ 4.7K_. R\6 2 Ri!

~~'}~ Rev{~~ 2.1K ~ 30K 0,_;.1..:...1-t-----'''-+ ---vv~ 9 9 o AWG -042, No.5 Q., 'J. J. . sv 12

o---t------+AWG-041 , No.7

'"'o-1-3-t------+AWG-041, No.4

~14.;.!.._+-------+AWG-042, No.4

S1 1M Rl41 15 ~ o ~ o ~ o t 51K R 0..:..;:;._-f----,....1-

---R-lK - C1'! 1f0/2R5 ~~r sfK,.., 16 "'' ~ _ o--=-+----~AWG-041, No.5

~ 0 ~ 0 I ,'If ~fif;1fR1 :o-:-=:-!-------+AWG-041 , No.6 I ...., 0 ,..., 0 ...., 0 ,, •oo•f •oo• ~'o l K 1 l c, f!~~ ~ I~; To 1 <>---ANV----0

R~ 30K R1 470K

1 I 2 I

SX-1250

3

A

B

c

D

3

8 1

Parts List of Filter Amplifier Assembly (AWM-089)

SEMICONDUCTORS

Symbol Oeser ipt ion Part No. Symbol Description Part No.

01 Transistor 2SC1313-G CB Mylar 0.1 50V COMA 104J 50 (2SC1345·DI C9 Electrolyt ic 4.7 25V CSZA 4R7M 25

02 Transistor 2SC1313-G C10 Ceramic 5600., 50V CKDY A 562J 50 (2SC 1 345-Dl

C11 Ceramic 2700p 50V CKDY A 272J 50 C12 Electrolyt ic 10 25V CSZA 100M 25

SWITCHES

Symbol Oeser ipt ion Part No. --

S1-4 Push switch (LOW FILTER, ASG-098 HI GH Fl L TER, MULTI PATH, FM MUTING)

RESISTORS

Symbol Descript ion Part No.

R1 Carbon film 470k RDY.PS 4 74J R2 Carbon film 100k RDY.PS 104JNL

R3 Carbon film 5.1 k RDY.PS 512J R4 Carbon f il m 4.7k RDY. PS 472J R5 Carbon fi lm 2 .2k RDY.PS 222J -R6 Carbon f ilm 1M RD'!.PS 105J R7 Carbon film 1M RD'!.PS 105J RB Carbon film 30k RD'!.PS 303J R9 Carbon f ilm 30k RD'!.PS 303J R10 Carbon film 1k RDY.PS 102J

R11 Carbon f ilm 220k RD'!.PS 224J R12 Carbon film 470k RDY.PS 474J R13 Carbon film 100k RD'!.PS 104JNL R14 Carbon film 5.1 k RD'!.PS 512J R15 Carbon film 4.7k RD'!.PS 472J

R16 Carbon f il m 2.2k RD'!.PS 222J R17 Carbon f ilm 1M RD'!.PS 105J R18 Carbon fi lm 1M RD'!.PS 105J R19 Carbon f ilm 30k RD'!.PS 303J R20 Carbon film 1k RD '!. PS 102J

R21 Carbon film 30k RD'!.PS 303J R22 Carbon film 220k RD'!.PS 224J

CAPACITORS


C1 Mylar 0.1 50V COMA 104J 50 C2 My lar 0 .1 50V COMA 104J 50 C3 Electrolytic 4.7 25V CSZA 4R7M 25 C4 Ceramic 5600p 50V CKDY A 562J 50 C5 Ceramic 2700p 50V CKDY A 272J 50

C6 Electro ly tic 10 25V CSZA 100M 25 C7 My lar 0.1 50V COMA 10 4J 50

82

12.13 MICROPHONE JACK ASSEMBLY (AWX-097)

1 -~

.--------------------06

.,

2

,.

1

1 r t ().1

000471 Rl 1 R3 Rs ().2

lBOK ~ 33K 180K ~

D 0

03 r 0

I • 0 [ f" 1,,

().4 R2 ·po4 ...,

180K 0

().5

t" t" n6 r b

0 Cl 0.0047 33 K 180K "'

• o-H-.., 1. C4 r 07 0.0027

Parts List of Microphone Jack Assembly (AWX-097)

RESISTORS

Symbol Oeser iption Part No .

R1 Carbon film 180k RDY.PS 184J NL

R2 Carbon film 180k RDY.PS 184JNL R3 Carbon f ilm 39k RDY.PS 393JNL

R4 Carbon fi lm 39k RDY.PS 393JN L

R5 Carbon film 180k RDY.PS 184JNL

R6 Carbon fi lm 180k RDY.PS 184JNL

3

I ___ _j

Jr.

@ PHONO 2 (R)

@ PHONO 2 (L)

AWS-094, No.27

AWS-094, No.18

AWS-094, No.21

CAPACITORS

Symbol Description

C1 Mylar 4700p

C2 Mylar 4700p

C3 Mylar 2700p

C4 Mylar 2700p

C5 Ceramic 0.04

OTHER

Symbol I Description

- I Phone jack ( M I C)

SX-1250

Part No.

50V COMA 472J 50

50V COMA 472J 50

50V COMA 272J 50

50V COMA 272J 50 50V CKDYF 403Z 50

Part No.

AKN-013

8 3

......

~ . -~ V)

D ~3 0

250610 \.~ <>.:

~

'E.

" ;::; 0 -

L___ __ _

w

0

,-,

~ _,

"' d "' "' ~ 0 ~ ,, <r

J>

"tt 0 :E m ...... :::0 J> s: "tt r "T1

m :::0 J> en (/) m :s: OJ r -< -J> :E ::t 6 .;.. N ~

w

A

07

B

c

D

SX-1250

1 2 3

AWM -091, No. 13 (AWR-106, No. 1) +--- - ....--- ...,__--,

.--+----+---+AWM-091, No. 12 (AWR -106, No.2)

o9

.. r c.~ T410/&o

·r Cs 710118

1

+ Ct <>-4-<>

10/ 16

C.llOP o-t 1-<>

WM-091, No.6 (No.9)

2

WM-091, No.5 t----l>AWR-1 06, No.13 '--~AWF -021, No.3

t-- --+AWR-1 06, No. 1 0 t----l>AWF-021, No.8

C•s 0041 o---1 1--<>

+f C16 410/80

3

A

B

c

D

85

Parts List of Power Amplifier Assembly (AWH-048)

SEMICONDUCTORS


01 Transistor 2SA750-E 02 Transistor 2SA750-E

R19 Carbon film 47 RD%PS 470J R20 Carbon film 620 RD%PSF 621J

03 Transistor 2SC1439-B 04 Transistor 2SC1439-B 05 Transistor 2SA858-B

R21 Carbon film 100 RD%PSF 101J R22 Carbon film 100 RD%PSF 101J

R23 Carbon film 10k RD%PS 103J

06 Transistor 2SA858-B Q7 Transistor 2SC1904A·B

R24 Metal oxide 100 1W RS1PF 101J R25 Metal oxide 100 1W I RS1PF 101J

08 Transistor 2SA899A-B 09 Transistor 2SD61 0-R 010 Transistor 2SB630·R

R26 Metal oxide 1k 1W RS1PF 102J R27 Metal oxide 1k 1W RS1PF 102J R28 Wire wound 0.5 5W I RT5B OR5K

011 Transistor 2SC869-C R29 Wire wound 0.5 5W RT5B OR5K R30 Carbon film 22 RD%PSF 220J

D1 Varistor STV-3H D2 Varistor STV-3H D3 Diode 151886

(SIB01 ·02) D4 Diode 1S1886

(SIB01-02)

R31 Carbon film 22 RD%PSF 220J R32 Wire sound 0.5 5W RT5B OR5K R33 Wire wound 0.5 5W RT5B OR5K R34 Carbon film 22 RD%PSF 220J R35 Carbon film 22 RD%PSF 220J

D5 Diode 152473 D6 Diode 1S1886

- (51801-02) D7 Diode 1S1886

(SIB01 ·02)

R36 Metal film 4.7 1W RN1H 4R7K

R37 Metal film 4.7 1W RN1H 4R7K R38 Metal oxide 10 2W RS2P 100J R39 Metal oxide 10 2W RS2P 100J R40 Carbon film 1.2k RD%PSF 122J

DB Diode 152471 D9 Diode 152471 D10 Diode 151886

R41 Carbon film 1.2k I RD%PSF 122J R42 Carbon film 13k RD%PS 133J R43 Carbon film 13k RD%PS 133J

(SIB01-02) D11 Diode 151886

(SIB01-02)

VR1 Semi-fixed 470-B ACP-033 VR2 Semi·fixed 470-B ACP-033

RESISTORS CAPACITORS

Symbol Description Part No. - - ---1

R1 Carbon film 3.3k RD%PS 332J R2 Carbon film 220k RD%PS 224JNL R3 Carbon film 82 RD%PS 820J R4 Carbon film 47k RD%PS 473JN L R5 Carbon film 47k RD%PS 473JNL

Symbol Description Part No. - f--

C1 Metallized mylar 1 100V ACE-008 C2 Electrolytic 10 16V CEANL lOOP 16

C3 Ceramic 47p 50V CCDSL 470K 50

C4 Ceramic 120p 50V CCDSL 121 K 50 C5 Electrolytic 220 16V CEANL 221P 16

R6 Carbon film 82 RD%PS 820J R7 Carbon film 62k RD%PS 623JNL RB Carbon film 200k RD%PS 204JNL R9 Carbon film 100 RD%PS 101J R10 Carbon film 100 RD%PS 101J

C6 Ceramic 47p 500V CCDSL 470K 500 C7 I Ceramic 10p 500V CCDSL tOOK 500 CB Mylar 0.1 50V COMA 104J 50 C9 Ceramic 47p 500V CCDSL 470K 5€10 C10 Ceramic 47p 500V CCDSL 470K 500

R11 Carbon film 16k RD%PS 163J R12 Carbon film 16k RD%PS 163J R13 Carbon film 1.5k RD%PS 152J R14 Carbon film 62k RD%PS 623JNL R15 Carbon film 220 RD%PSF 221J

C11 Electrolytic 0.22 10V CSZA A 22M ·1 0

C12 Mylar 0.039 250V COMA 393J 250

C13 Ceramic 0 .047 150V ACG-009 C14 Ceramic 0.047 150V ACG-009 C15 Electrolytic 470 80V ACH-038

R16 Carbon film 220 RD%PSF 221J R17 Carbon film 1k RD%PSF 102J R18 Carbon film 47 RD%PS 470J

C16 Electrolytic 470 80V ACH-038 C17 Ceramic 0.047 150V ACG-009 C18 Ceramic 0.047 150V ACG-009

8 6

SX-1250

OTHERS

Symbol Description Part No. -

Heat sink ANH-237

L1 AF choke coil 2.2SJ H T63-009 Transistor socket AKH-002 Insulator wafer AEC-088 . Contact strip (3p, L-type) AKM-024

Contact strip (4p) AKM-034

Contact strip (3p) AKM-033

87

12.15 SPEAKERS SWITCH ASSEMBLY (AWS-095)

s 10

11

'2

ON

n OFi="

14S0 A 13 i5SPB 16SPC n--- --~~-- --x----I---l I I

I

0 lf)

0 Lf)

a::

L __ _ 1 b 8 5 4 2. 3

Parts list of Speakers Switch Assembly (AWS-095)


S1 Push swi tch (SPEAKERS) ASG -094

Rl Metal oxide resistor 150 3W RS3P 151K R2 Metal oxide resistor 150 3W RS3P 151K

J1 Phone jack (PHON ESl AKN-010

BB

A

-

B

c

~ II

D

SX-1250

1 2 3

A

AWM -091 , No.8 +------,

.a...a 0 ~ 0 ,a.,.& 0 i...i 0

~0~0~0~0

!

~ 0 .a.-a 0 .a...a 0 .a...& 0

~o~o~o~o

0 0

~0~ 0 ~0~0

-e-e'o~o~o~o

R1 150 (3W) o---~~~----~o

SP. C

SP. B

I

SPA

Rz 150

C3Wl

---= -· HEADPHONES ----·-

1 2

c 1 .---------+08 L o-

2 .--------+o~ R o-

~3-t-ti-~~----~~ L o-,.----t-+-t--i-+--+---+0~ R o-

4 '"' L O-

S L.....t-+------+-o~ R o-

6

7 ..---+---;>AI\ WM -091, No.7

8

~AWS-094, No.1

r---1-..__1_. · AWR -106, No.8 9

10

~ 11

A j

s J

c J

'--:-:-+-------------.[< L~L, ~ t 014 *

15

16

~ 17

3

B

c

D

8 9

(D 0

.....

N

w

0 (")

~

::; 2SC 1166

___ _:Q_:_G _2SC 1166 --?--- ::' . 2 1S2413• 2 ,-

'<:

~ ~

n·

(; ,d2 1SCS45Aix L

2~ fN

6~

-0.1V

J

'< ~. (..)

rY ,,

:;; L ,-< 0)

+ C" k:. I l:t:.

a,

"

'>:: N

::: ; 1$2413

,, ,;

" '~" f't fO c- N ,. N

... ''

CJ V)

ri n

~

"-'

4 ~~-------------+-----r----~------._~~--~~4---._-+~

I ~

0::. (._ (~

.n

,~{ ~~ ""' C.> _J_ -5.1V t= I

, - .L 1S2413

L__ -----L----i4v AC 1.SV

0 (")

co

65V 1

,f5 -~

co

.-1 I I I I I I L

t. 0::

.. --SS151R SS151

--, r-- 1 I

.1. '( I

i : I c:; I

(,

I I l T 0> I I c__

f- I I I I J I __ .J L--

::-~ ~ ("}

;~ {"} .. ~ ...

'( y ~ ,.., (") ,..,

)>

..... ~ ..... 0)

""0 ::0 0 -i l ..... m (") -i

-~

l I

0 z (")

::0 (")

I c -i )>

A

! (I) (I)

2 m s: co r -< )>

I

0 ,, CJ I ri (.) 0

<tJ: - 0

c

I , u

l T

~ I N 6 (£) ..... -

'2

<} 13 I

I 1 4

w

)>

A

B

c

D

1 2 3

RELAY

R?A 3.3 K ( 3W)

tooooooooJ 0 w.. 0

Cs G4

f'" ++ ++

~~~~ IS2473 100/50 100/16

R1o 3.3~ <3Wl Q.s R11 22

¥~ Cn 0.01

~t--o

S51 51 R

c~ o o1 ~t---o

14 13

c •• 0.01 <>--i t----<>

S5151

12

Cs 001 ~I---<>

11

< I

,....- ~

22,000/8o C2 ~ + ,tC1

___..~

22,000/80

10

c; I

~I VLT

---4AWH-048, No .. 12

'----~AWH-048, No .. 15

1

9 lq

8 7 6

I

2SCI166 G7100P <>-H-o

OV Q. 35V

" 4

l.OV ~6 Rl6 ~ CG 35. GV

+ · 368V

68K 2SC945A, r IOO/so 2SC1166 t I J

152471

5 4 3 2

I <

I L

l ,

AWH-048, No.1 (L)~ AWH -048, No .. 1 (R)~

AWG-042, No .. 2+---... AWR -106, No.14 +------'

AWR-107, No.12+----~

AWR-106, No.11 +-------. AWH -048, No.3+----. AWF -021, No.8 +------'

--+AWH -048, No .. 13 (L) AWS-095, No .. 8

'-----~AWS-095, No.1 L...._ ___ -4AWH-048, No.13 (R)

2 3

A

B

c

D

91

SX-1250

Parts list of Protection Circuit Assembly (AWM-091)

SEMICONDUCTORS CAPACITORS

Symbol Description Part No. Symbol Description I Part No. f-- - f- 1- -

01 Transistor 2SC945A·O C1 Electrolytic 470 6V CEA471P6 (2SC1647-P) C2 Electrolytic 470 6V CEA 471P 6

02 Transistor 2SC945A-0 C3 Electrolytic 4.7 25V CEA 4R7P 25 (2SC1647-P) C4 Electroly t ic 100 16V CEA101P16

Q3 Transistor 2SA733·0 C5 Electrolytic 100 50V CEA101P50

04 Transistor 2SC945A-0 C6 Electrolytic 100 50V CEA101P50 (2SC1647-P) C7 Ceramic 100p 50V CCDSL 101 K 50

05 Transistor 2SC1166-Y C8 Ceramic O.Q1 150V ACG-004 (2SC 1384-0) C9 Ceramic 0.01 150V ACG-004

06 Transistor 2SC1166-Y C10 Ceramic 0.01 150V ACG-004 (2SC1384-0)

Dl

I Diode 152473

D2 Diode 1S2473 D3 Diode 1S2471

C1 1 Ceramic 0.01 150V ACG-004

OTHERS D4 Diode 1S2473 D5 Diode 1S2473


D6

I Diode S5151R

D7 Diode S5151

Sl Relay ASR-010 Contact strip (3p, L-type) AKM-024 Contact strip (5p, L -type) AKM-025

RESISTORS


R1 Carbon film 75k RDY..PS 753J R2 Carbon film 75k RDY..PS 753J R3 Carbon film 2.2k RDY..PS 222J R4 Carbon film 82 RDY..PS 820J R5 Carbon film 82 RDY..PS 820J

R6 Carbon film 10k RDY..PS 103J R7 Carbon film 15k RDY..PS 153J R8 Carbon film 15k RDY..PS 153J R9

I Carbon film 2.2k RDY..PS 222J

R10 Carbon film 150k RDY..PS 154J

R11 Carbon film 15k RDY..PS 153J R12 Carbon film 15k RDY..PS 153J R13 Carbon film 68k RDY..PS 683J R14 Carbon f ilm 91k RDY..PS 913J R15 Carbon film 12k RDY..PS 123J

R16 Carbon film 68k RDY..PS 683J R17 Carbon film 22 RDY..PS 220J R18 Carbon film 15k RDY..PS 153J R1 9 Carbon film 2.2k RDY..PS 222J R20 Metal oxide 220 1W RS1P211J

R21 Carbon film 5.6k RDY..PS 562J R22 Carbon film 6.8k RDY..PS 682J R23 Metal oxide 680 2W RS2P 681J R24 Metal oxide 3.3k 3W RS3P 332K R25

I Metal oxide 3.3k 3W RS3P 332K

9 2

12.17

A

B

c

D

93

1 2

STABILIZER ASSEMBLY (AWR-106)

; QL 2$C86S 2SD313P .........._

85V ~ ~ r <") -'

.,...j . CJ rr co

w ~4

2SC1384

0 .. lJ) cr::> (") +

.......... ........_

0 0 C> N .

N (1')

u L)

l.f)

0 (") . = ~

........_

...... 0 0 0

"' C'l . ::> N u ( J

Q8 ~§A684A 41V "{' s:

'( ('

~· ~

r (Y y .., ~ 0 10

~ Os (YJ cr: -81.5V (Y l..>

1:::; d ,J 6 2SA628A Q5 2SB50'1P ;:J 9 2SD325R

R1 '~ 25 15K

23Y 0:: 0 ....- ~ T ~ IJ) l.l) .......

C'oJ

"" N "' '.!' r u

4

3.\-< (3W) 33K 3\'1: I

3 7_ J 2SD325R 8 5.4V -62V 62V I~ 3 2SC.945A

1 2

3

I A

6SV

10 25V

'-' teo

I

"" (..)

12 Gf\JD

0 B CD ...... r t-~·

;J ()

14 -25V

jl I

-GSV 'l 13.SV

c

(D

~

1:

I ....J

D

3

A

8

c

D

94

1 2 3 ----------~~------------------------------------~--------~

16 0

C12 + o'-fJ-o 47160

CIO ....

o-ft-<> 100/35

~ I 15 14 13 12

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

1

)

0 0

~ 2.7K ~

2SC669 i 66~1·~ 0 • R1

i 2.7K

656::~~ • zso3,~v

65V 17 0

5 4

R15 3.3K (3\1.1! 'If\/\, 0

R1s 3.3K ( 3W) '11\11,

C11 00! o----4 ...._._..,

3

07 S5J5lR

0

Cto 00! ~I--<>

AWH -048, No.12 +-----' AWH-048, No.15 ~--------'

'-----l""'WR-107, No.9 '----~AWR-107, No.8

...._-------#\WS-094, No.1 '-----~AWS-095, No.9

..----=---~AWE-068, No.15 't--t' Cl 't-orr-----+A WE -068, No.7 '-----~MWS-094, No.32

t-------+.AWE-068, No.39 '--------;..,....WG-042, No.1

2 3

22,000/80

A

B

c

D

Parts List of Stabilizer Assembly (AWR-1 06)

SEMICONDUCTORS


1---01 Transistor 2SD313P-E

02 Transistor 2SC869-D

03 Transistor 2SC1318-R 04 Transistor 2SC1384-R 05 Transistor 2SB507P-E

06 Transistor 2SA628A-D Q7 Transistor 2SA720-R 08 Transistor 2SA684A·R 09 Transistor 2SD325R·E 010 Transistor 2SC945A-R

011 Transistor 2SC945A·R 012 Transistor 2SD325R-E 013 Transistor 2SC945A·R

D1 Zener diode WZ-240

D2 Diode 1S2473

03 Zener diode WZ-240

D4 Diode 1S2473

D5 Zener diode WZ-061

D6 Diode 1S2473 D7 Diode - S5151R DB Diode S5151

RESISTORS

Symbol Description Part No. ---1--

R1 Carbon film 2.7k RDY.PSF 272J

R2 Carbon film 2.7k RDY.PSF 272J

R3 Carbon film 2.7k RDY.PS 272J R4 Carbon film 2.7k

I .RDY.PS 272J

R5 Carbon film 8.2k RDY.PS 822J


R7 Carbon film 1 k RDY. PS 102J

RB Carbon film 1k RDY.PS 102J

R9 Carbon film 22k RDY.PS 223J R10 Carbon film 22k RDY.PS 223J

R11 Carbon film 16k RDY.PS 163J R12 Carbon film 16k RDY.PS 163J

R13 Metal oxide 680 2W RS2P 681 K

R14 Metal oxide 1.5k 2W RS2P 152K

R15 Metal oxide 3.3k 3W RS3P 332K

R16 Metal oxide 3.3k 3W RS3P 332K R17 Carbon film 3.9 'h.W RD'h.PSF 3R9J

R18 Metal oxide 100 2W RS2P 101 K



R21 Carbon film 1k RDY.PS 102J



Symbol Description

R24 Carbon film 1.6k R25 Carbon film 1.5k

VR1 Semi-fixed 4.7k-B VR2 Semi-fixed 4 .7k-B

CAPACITORS

Symbol Description

C1 Electrolytic 220 C2 Electrolytic 220 C3 Ceramic 82p C4 Ceramic 82p C5 Electrolytic 47

C6 Electrolytic 47 C7 Electrolytic 22 CB Electrolytic 22 C9 Electrolytic 100 C10 . Electrolytic 100

C11 Electrolytic 47 C12 Electrolytic 47 C13 Electrolytic 1000 C14 Ceramic 82p C15 Electrolytic 47

C16 Electrolytic 22 C17 Electrolytic 220 C18 Electrolytic 47 C19 Electrolytic 47 C20 Ceramic 0.01

C21 Ceramic O.Ql C22 Ceramic 0.01 C23 Ceramic 0.01

OTHERS

Symbol J--- -+--

Description

Heat sink Heat sink Transistor socket Insulator wafer Contact strip (3p, L-type)

Contact strip (5p, L-type)

BOV BOV 500V 500V 35V

35V 50V 50V 35V 35V

BOV BOV 25V 50V 10V

10V 16V 10V 10V 150V

150V 150V 150V

SX-1250

l

P;ort No.

RDY.PS 162J RDY.PS 152J

ACP-034 ACP-034

Part No.

CEA 221P 80 CEA 221 P 80 CCDSL 820K 500 CCDSL 820K 500 CEA 470P 35

CEA 470P 35 CEA 220P 50 CEA 220P 50 CEA 101P 35 CEA 101P35

CEA470P 80 CEA470P 80 CEB 102P 25 CCDSL 820K 50 CEA470P 10

CEA 220P 10 CEA 221P 16 CEA 470P 10 CEA 470P 10 ACG-004

ACG-004 ACG-004 ACG-004

Part No.

ANH-237 ANH-300 AKH-002 ACE-088 AKM-024

AKM-025

95

12.18 POWER SUPPLY ASSEMBLY (AWR-107)

~~

uo

4 r <:t R4

Cro '2· ~ 21'1)

10 -81.SV

0.01 /1~0V Ds. DG

SIB01-0l x2 s

li) U) N 0> N

c:s-....... u -....... C::h + 0 r t '<1 "<!-

5 8 23V

~ I

·~ 01/150'.'

~ 12 11 1SA-'2SV

I I

Parts List of Power Supply Assembly (AWR-1 07)

SEMICONDUCTORS CAPACITORS

Symbol Description I Part No. -

D1 Diode SIBOl-04

Symbol Description ~~ PartNo. t- -

C1 Ceramic 0.01 250V CG-001 D2 Diode SIBOl-04 C2 Ceramic 0.01 250V ACG-001 D3 Diode SIBOl-04 C3 Ceramic 0.01 250V ACG-001 D4 Diode SIB01-04 C4 Ceramic 0.01 250V ACG-001 D5 Diode SIBOl-01 C5 Ceramic 0.01 150V ACG-004

(1S1885) C6 Electrolytic 470 100V CEB 471 P 100

D6 Diode SIBOl-01 C7 Electrolytic 470 100V CEB471P100

I (1S1885) cs Electrolytic 470 25V CEA 471P 25 C9 Electrolytic 470 25V CEA 471 P 25 C10 Ceramic 0.01 150V ACG-004

RESISTORS

Symbol Description Part No. OTHERS

R1 Wire wound 3.3 20W ACN·003 Symbol I Description Part No. R2 Metal oxide 2.2K 2W RS2P 222J R3 Metal oxide 10 2W RS2P 100K Fuse clip AKR-013 R4 Metal oxide 10 2W RS2P lOOK Fuse clip AKR-030

I MICROTEMP AEX-005

96

A

B

c

D

SX-1250

~--------1 ----------~L_ ___________ 2 __________ ~L_ __________ ~3 ________ __

11

C1 +

R4 10 CZNI ~

10 9

c. o~nttso o---i I--<>

0~ SlBOI 01 14 °

C5 0011'50 <>---it-

o, SlBOl-Ql 14 0

AWR -106, No.7

AWR-1 06, No.6

'-----~AWR-106, No.15

..._----~AWX-096, No.2

'----~ AWM-09 1 , No.2

1

5

2

4701100

$1801·04 SliiOHI4 51801 04

3

OR

GRN

BRN

OR

BLU

,_ ~

"'""'~ ~ '"""'

2

3

R! H C20W )

AC 120V 60Hz

A

B

c

D

97

13. PACKING

98

Side pad L AHA-107

Sheet AHG-037

Operating instructions ARB-164 .

FM T-type antenna ADH-002

Hexagonal wrench ANK-018

<J

Packing case

1 nside packing AHC-026

AHD-341 (English) AHD-342 (English/ French)

14. PARTS LIST OF EXPLODED VIEWS

Parts No. Parts Name

AAA-034 Knob AAB-100 Knob AAB-104 Knob AAD-113 Knob AAD-114 Knob

AAF-051 Dial Pointer

AAG·106 Dial Scale Plate AAP-037 Blind Sash AAT-025 Shaft Cover AAT-026 Ind icator

AAT-027 Indicator AAT-028 Indicator AAW-040 Double Meter ABA-002 Screw ABA-012 Screw

ABA-081 Screw ABA-087 Screw ABA-1 13 Screw ABA-114 Pulley Shaft ABA-116 Screw

ABA-123 .

Screw ABA-129 Screw ABE-006 Washer ABE-018 Washer ABH-022 Coil Spring

ABN-021 Nut ABN-022 Panel Base ABN-023 Washer Faced Nut ABN-024 Washer Faced Nut ACG-001 Capacitor (HG, S)

ACG-003 Capacitor (KCU) ACH-056 Capacitor ACV-163 Variable Resistor ACV-165 Variable Resistor ACV-166 Variable Resistor

ACV-167 Variable Resistor ACV-168 Variable Resistor ACV-169 Variable Resistor ADG-013 AC Power Cord (KCU) ADG-015 AC Power Cord (S)

ADH-002 FM Antenna ADX-029 Cable Housing ADX-030 Cable Housing ADX-031 Cable Housing ADX-032 Cable Housing

ADX-033 Cable Housing ADX-034 Cable Housing ADX-035 Cable Housing ADX-036 Cable Housing ADX-037 Cable Housing

Parts No.

ApX-038 ADX-039 AEB-085 AEB-086 AEB-087

AEC-076 AEC-079 AEC-101 AEC-15 1 AEC-178

AEC-256 AEC-258 AEC-272 AED-018 AEK-104

AEK-106 AEK-109 AEK-301 AEK-402 AEK-404

AEK-405 AEL-056 AEL-069 AEL-072 AEL-073

AEL-074 AEL-075 AEL-076 AHA-107 AHA-108

AHC-026 AHD-341 AHD-342 AHG-037 AKA-004

AKB-019 AKB-030 AKB-033 AKC-030 AKC-038

AKE-01 2 AKE-014 AKF-053 AKH-001 AKN-010

AKN-013 AKP-005 AKP-007 AKP-008 AKR-028 I

SX-1250

Parts Name

Cable Housing Cable Housing Rubber Bracket A Rubber Bracket B Rubber Spacer

Insu lator Wafer Strain Rei ief Pulley Wire Supporter Foot

Pulley Spacer Acrylic Board Mask Fuse (1 .5A) (KCU, S)

Fuse (1A) (KCU, S) Fuse (6A) (S) Fuse (12Al (KCU, S) Fuse (1A) (HG) Fuse (6.3A) (HG)

Fuse (1.6A) (HG) Lamp Ass Lamp L amp Lamp

Lamp Lamp Lamp Side Pad L Side Pad R

Inner Packing Packing Case (KU, S, HG) Packing Case (KC) Sheet Terminal

Terminal Terminal Terminal Terminal Strip 2P Terminal Strip 2P

Terminal Terminal Connecting Plate Transistor Socket Phone Jack

Phone Jack AC Socket (KCU, S) 5P Connector Socket AC Socket (HG) Fuse Holder 1 P

99

Parts No. ----

AKR-031 AKX-031 AMM-049 ANB-386 ANE-105

ANK-018 ...

ARB-164 ARB-168 ARB-171 ARD-089

ASG-094 ASG-095 ASG-098 ASH-015 ASK-080

ASK-084 ASK-090 ASK-092

ASK-099 ASK-105

ASR-015 ATB-051 ATT-267 ATT-291 ATT-295

AWB-023 AWE-068 AWF-021

AWG-041 AWG-042

AWH-048 AWM-089 AWM-091 AWR-106 AWR-107

AWR-108 AWS-094 AWS-095 AWS-098 AWX-062

AWX-096 AWX-097 AWX-099 AWX-100 AXA-070

AXA-111 871-004 871-010 M45-086 T22-025

100

Parts Name

Plug in Selector Plug in Selector Wooden Cover Front Panel Ass Top Panel

Hexagonal Wrench Operating Instruction Operating Instruction Operating lnstructton Operating I nstructton

Push Switch Push Switch Push Switch Slide Switch Power Switch (KCU)

Lever Switch Lever Switch Lever Switch Power Switch (S) Power Switch (HGI

Relay · Ferrite Bar Antenna Power Trans (KCU) Power Trans (S) Power Trans (HF)

FM Front End Tuner Ass EO Amp Ass Control Amp Ass Flat Amp Ass

Power Amp Ass Filter Amp Ass Protection Ass Stabi l izer Ass Power Supply Ass

Power Supply Ass Function Switch Ass Speaker Switch Ass Speaker Switch Ass 5P Connector Ass

Lamp Board Ass Mic Jack Ass Switch Ass (KCU) Switch Ass (S) Tuning Drum Ass

Tuntng Shaft Ass Nut Nut Washer Ferrite Balun

Parts No. -

W72-092 2SD555-R 2SB600R

-- Parts Name

Bar Antenna Holder Transistor 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.4 100, with the exception of the power supply section and the deemphasis selector which are described in this supplement.

15.1 CONTRAST OF MISCELLANEOUS-PARTS

FUSES

Part No. Symbol Amp Remarks

KCU type HG type S type

FU1·4 1A AEK-106 AEK-402 AEK-106 Secondary

- ---FU5 1.5A AEK-104 ........ AEK·104

1.6A . . . . . . . . AEK-405 .. ... ... Lamp circuits

FU6 12A AEK-301 •• 0 ••••• AEK-301 Primary vel tage : 11 OV, 120V

6.3A ..... . .. AEK-404 . ....... Primary vol tage: 220V, 240V

6A 0 • •••••• ........ AEK-109 Primary voltage: 220V, 240V

SWITCHES

Symbol Part Name Part No.

Remarks KCU type HG type S type

S1 Lever switch ASK-080 ASK-105 ASK-099 POWER

S3 Plug in selector ........ AKX-037 . ....... 2-position (Line voltage selector) . . . . . . .. . . ..... . AKR-031 4-position with fuse holder

TRANSFORMER

Part No. Symbol Part Name Remarks

KCU type HG type S type -

T3 Power T ransformer ATT-267 ATT-295 ATT-291

RESISTOR



R1 Carbon film 2.2M %W RD%PS 225J ... ..... . .......

CAPACITORS -



C12 Ceramic 0.01 150V ACG-003 ••• • ••• 0 •• 0 0 •••• DC1.4kV

Ceramic 0 .01 250V . . .. . ... ACG-001 ACG-001

C13 Ceramic 0.01 150V ACG-003 ........ . ..... . . DC1.4kV

Ceramic 0 .01 250V . . . . . . . . .. .. .. .. ACG-001

-C15 Polystyrene 510p 50V • • • • • • 0 0 CQSA511J50 ........

-· C16 Polystyrene 510p 50V . .. .. . .. CQSA511J50 ••• • 0. 0 0

C17 Ceramic 56p 50V . . . . . . . . CCDSL560K50 ........

101

P.C. BOARD ASSEMBLIES

Part No. Part Name Remarks

KCU type HG type Stype

De-emphasis switch assembly AWX-099 ........ . ....... 2-position (25s.IS/75).1s) ........ . ....... AWX-101 3-position (25).1s/50).1s/75).1s)

Power supply assembly AWR-107 AWR-108 AWR-1 07

Speakers switch assembly AWS-095 AWS-098 AWS-095

OTHERS

Part Name Part No.

Remarks KCU type HG type s type

AC po\11/er cord ADG-013 0 ••• 0 ••• ADG-015

AC socket (OUTLET) AKP-005 ........ AKP-005

AC socket (INLET) . . . . . . . . AKP-008 ........

Operating instructions ARB-164 ARB-171 ARB-168 English ........ ARD-089 . ....... German/ French

102

15.3

A

B

c

D

105

1 2

SCHEMATIC DIAGRAM FOR SX-1250/HG

Lch

l

r~-· RchlP..O.O 1

.,,

1

SWITCHES, S, POWEA S, RELAT S, M.iO..T.IGf SfLECll.lll!l.Zllll i1ll401 $, ~M ~-ON s. FM OFF-Q!:! So ~ONO I ill - ON S,. f'HONO 2/MIC ill- ON S,. AUX 2Ef.- ON S• TAP( roNITOR I Qft ON S, TAPE ~NITOR 2 Q!l.- ON So TAPE DUPLICATE OFF- ON S• AOAPTOR .Qff:- ON S• MODE ill.!!.tQ- MONO S, MUTING Q!l.- ·2Qd6 Su LOUDNESS 2Et.- ON Sn TONE ~-ON S,. LOW FILHR Qfr- J0H1 S~ HIGH FILTER OFF - 8kHt s. SPEA,ER A E- ON Sn SPEAI<EA B .QEE- ON S,. SPEAKER C OFF- ON

S,, FM MUTING s. FM MULTIPATH S,, REED RELAY 511 RELA'1

RESISTOR ,

OFF -.Q!i QEt- ON

IN 0HM,I/4W '5'' TOLERANCE UNLfS5 OTHERWISE NOTED K •ll H Hll

CAPACITORS, N..,F UNLESS OTHERWISE NOTED P pF

2

SX-1250jHG

3

FM AM TUNER ASS')" AWE · 06e r ·---------·---·-·-·-·-·-·-·-·-· I ! ,, ....

• I :~1

c::::YJ SIG~AL VOLTAGE AT SPEMER Ou'PuT J6V18ll '-"' <> DC CURRENT A I NO INPL T S•GNAL

0C VOLTAGE AT NO .NPUT SIG NAL

3

4

POWER SUPPLY .O.SS'y .O.WR ·106 r·-·-·-·-·-·-·-·-,

d --1?.>-----,9-! _ f 0, 2SC8U • 2SD313P • uv

'i 30••

·----

4

5

5

PAOTECTIO" .o.ss•y .O.WM •0!1 )12

6

6

A

B

c

1 lch

J

D

15.2

A

B

c

D

1 2

SCHEMATIC DIAGRAM FOR SX-1250/S

I~ ~ ~--------~

PlfDHOl

r::JEJ

"[ ~~~

f

"'

Pt1QNO ~

Rcn

l""OhQ I

'"'

1

SWITCMES; s, POWER s, RELAY s, fUst HOlDER s, A~

s. ·~ So ?MONO 1 s. P><ONO 2/~IC s,, AUX s, TAPE MONITOR 1 s, TAPE "'NITOR 2 s,, TAPE OUPLICATE s, ADAPTOR Sm "DOE s., MvTING s. LOUDNESS

s" TONE s. .Ow FiLTER s~ HIGH FILTER s. SPEAKER A s, SPEAKER B s. SPEAKER C

OFF- ON S,, - s,. lHOV 1.1'20V~?!0'<4.1oi0Vs,,

Qf£. -ON S. OFF-Q!:! S" Qll- ON m-o·

!="'' MUTING Fl'\ MULTIPATH REED RElAY RELAY FM DE- EMPHASIS

OFF -.Qli !!fr -ON

1~,..s - so,.s - '!hl

OFF- ON Qtt- ON Qf£.-ON OFF- ON

RESISTOR ; IN 0HM.1/4W >5'' TCL~RANCE U"'ESS OTHERw·SE NOTED K •ll M Mll

QEI- ON ill.!lli!- MONO .Qfr-·20dB Qtt.- o•

CAPACITORS. \_.F J'LESS CTHERW SE NOTED P p<

QE.t... -ON 2Ef. -lOHi OFF-8kHa ~-ON .Qtt.- ON ()FF- ON

2

3

FM OE- EMPHASIS SWITCH Ass'y

AWX - 101

4

POWfR AMP ASl'y AWH-048

~...:..._ ______________________ J_ __________ ~-~---r ·-----~ ·-:---·--i .. ~ ,, ~

C}) SIGNAL VOLTAGE AT SPEAo\(R :.TPuT l8V/8 Q. 'kH L =C> DC CURRENT AT NO INPc T SIGNAL

or VOLTAGE AT NO INPUT SIGNAL

3

fi 'o, :1 ®,, s.A ' -®: :®- r 1 ·L ,~ .~ LJ ~

i ~ ® '· _:?,·· '• i ~ : L_ _______ ·.=..:_ _______ ' ~--j

4

5

5

PROTECTION ASS'y AWM - 0,1 Y2

SX-1250/S

6

flJ, llA 1110,1!0Vl 6Ail20, 744Vl

6

A

B

c

D

104

SX-1250/S

15.4 DE-EMPHASIS SWITCH ASSEMBLY (AWX-101, for S type)

2 3 4 ,- -, I

I CL CL 0 0 0 0 0J 0J

I

I I

Cs 56P

• C,ISOP I L _________ j

C1l'lDOP C6 56P C4 510P 1 o-tt-o o-U--o o-u--o 00 AWE-068, No.4

I Si I

2 0 0 : i 00

g 3 0 0 00

4 c~ 150P Cz1200P Cs 5tOP 00

0--fJ--0 o-u--o o-f 1-<>

AWE-068, No.1

AWE -068, No.5

AWE-068, No.2

Parts List of De-emphasis Switch Assembly (AWX-101, for S type)


S1 Slide switch (DE-EMPHASIS) ASH -017

C1 Ceramic 1200p 50V CKDYA 122J 50 C2 Ceramic 1200p 50V CKDY A 122J 50 C3 Ceramic 150p 50V CCDSL 151 K 50 C4 Polystyrene 510p 50V CQSA 5 11J 50 C5 Polystyrene 510p 50V CQSA 511J 50 C6 Ceramic 56p 50V CCDSL 560K 50

107

15.5 SPEAKERS SWITCH ASSEMBLY (AWS-098, for HG type)

ON

t OFF

1'1 14 SPA 13 15 SP B 16 SP C -- x- --=e---x--,

~ ~ <:') ~

C! 0] 0 0 If) Li)

"' r2 a::

I L_ __ _

5 4 2 3

Parts List of Speaker Switch Assembly (AWS-098, for HG type)


S1 Push switch {SPEAKERS! ASG-100

R1 Metal oxide resistor 150 3W RS3P 151 K R2 Metal oxide resistor 150 3W RS3P151K

Phone jack {PHONESI AKN·010

108

SX-1250/ HG 1 I 2 I 3

A A

. .. AWM-091, No.8 .. - -::> 1

'"' L 0-6 2 A

R O-0 i...i 0 ~ 0 ~ 0 .i...i

'"' L O SP. C 6 3 B ~ 0 ~ 0 ~ 0 ~ 0 6 4

f'I R O-

.O L O-

8 b 5 R O c

8

b 6 ~.

~ 0 ~ 0 &...i 0 ~ 0

SP. B 6 7 ~ o -~ 0 ~ 0 ~ 0 b 8

AWM -091, No.7

0 0 rAWS-094, No.1 .. 6 9

AWR-106, No.8 ... &...i 0 ~ 0 ti...i 0 ~ 0

SPA <j>10 ~ 0 ~ 0 ~ 0 ~ 0

J 9 11

0 12 ~-- R· 150 l3W,

( Vt ~PL PL5

c <j>13 PL7 6 c ,r,

R2 014

~ 150 C3Wl 915

PHONES 016 JACK

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~ I SIBOI -ol•2 "' lr)

r" "' 0 c) ~ .. + ~

6 ~ <:] u

Parts List of Power Supply Assembly (AWR-1 08, for HG type)

SEMICONDUCTORS


Dl Diode SIBOl -04 CAPACITORS

D2 Diode SIBOl-04 D3 Diode SIBOl-04


D4 Diode SIBOl-04 C1-C4 Ceramic 0.01 250V ACG-001 C5 Ceramic 0.01 150V ACG-004

D5 Diode SIBOl-01 C6 Electrolytic 470 100V CEB 471P 100 (IS1885) C7 Electrolytic 470 100V CEB 471P 100

D6 Diode SIB01·01 C8 Electrolytic 470 25V CEA 471P 25 ( IS1885)

C9 Electrolytic 470 25V CEA471P25 C10

RESISTORS Ceramic 0.01 150V ACG-004

Symbol Description Part No. OTHERS

Rl Wire wound 3.3 20W ACN·003 R2 Metal oxide 2.2k 2W RS2P 222J


R3 Metal oxide 10 2W

I RS2P lOOK

R4 Metal oxide 10 2W RS2P lOOK Micro temp AEX-005 Fuse clip AKR-010

110

.---+--o13

012

FU~

1.6A

011

Z 2K/~W

tR> tea

+ 470/25

10 9 8

c. 0.01/ 150 <>-!!---<> us S1BOI1ll

0 14 0

CsQOI/100 <>-!!---<>

• C9 <>-J;t-o 410/2~

7

Ftl4 lA

6

AWR-106, No.7

AWR-106, No.6

'----~AWR - 106, No.15

AWX-096, No.1

AWM-091, No.2

FU3 IA

5

D1 ~ 04 SIBOI 01 <4

~~ - C• 0.01/250 ,4

GRN

BRN

GRN

OR

BLU

BLU

SX-1250/HG

~A L[

cl2 0.01

WHT s.

R1 33 C10WJ

AC INLET

220V 240V 50/ 60H

D

111

sx-1250 service manual (hi-res)

Documents

circuit of fm

tuner section fm

local oscillator output

local oscillator load

stage rf amplifier

circuitry of fm

level diagram

block diagram