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SONY WMGX400
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY WMGX400 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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This manual is accurate and of high quality. It is only volume 2 of the service manual. This is schematic, parts lists, and exploded mechanical drawings. The theory of operation and the diss-assembly instructions are in volume 1. The unit can be tricky to dis-assemble portions of so the volume 1 manual can be important. The product description of the manual is accurate but it does not say anything about volume 1 and the image of the front page does clearly say Volume 2.
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It has all the information you will need to fix it. The main circuit diagram is only A4 but being a PDF, you can print it to any size - I did it on two sheets of A3 and it didnt lose any detail - just made it readable when pinned up above the bench. I've found the fault, just need to buy some obscure bits to get it going again! I cant fault the process, I paid for the manual in the morning and it was ready to download by lunch time.
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Text excerpt from page 6 (click to view)
WM-GX400

SECTION 3 ADJUSTMENTS
3-2. ELECTRICAL ADJUSTMENTS
Note: 1. Supplied voltage: 3 V (DC) 2. Switch and control position VOLUME control SPEAKER/HEADPHONE switch AVLS switch FUNCTION switch ISS switch

3-1. MECHANICAL ADJUSTMENTS
PRECAUTION 1. Clean the following parts with a denatured alcohol-moistened swab : record/playback/erase head pinch roller capstan rubber belts 2. Demagnetize the record/playback/erase head with a head demagnetizer. (Do not bring the head demagnetizer close to the erase head.) 3. Do not use a magnetized screwdriver for the adjustments. 4. After the adjustments, apply suitable locking compound to the parts adjusted. 5. The adjustments should be performed with the rated power supply voltage unless otherwise noted. 6. Power supply voltage : 3V DC. Torque Measurement
Mode Forward/Reverse Torque Meter CQ-102C Meter Reading 1.97 to 3.92 mN • m (20 to 40 g • cm) (0.28 to 0.55 oz• inch) 0.05 to 0.49 mN • m (0.5 to 5.0 g • cm) (0.007 to 0.07 oz• inch) CQ-102RC 0.05 to 0.49 mN • m (0.5 to 5.0 g • cm) (0.007 to 0.07 oz• inch) more than 4.90 mN • m (50 g • cm) (0.7 oz• inch)

: maximum : i (headphone) : OFF : OFF :1

TAPE DECK SECTION
Test Tape
Type WS-48A Signal 3 kHz, 0 dB

0 dB = 0.775 V

Used for Tape Speed Adjustment

Tape Speed Adjustment Procedure:
test tape WS-48A (3kHz, 0dB) set 16Ω frequency counter

Forward Back Tension Reverse Back Tension

CQ-102C

i headphone jack (J301)

Fast Forward and Rewind

CQ-201B

1. Set REC TIME switch (S706) to NORMAL (4.8cm/s). 2. Play back the center portion of tape in REVmode, adjust RV602 so that the reading on the frequency counter becomes 3,000 Hz. 3. Set REC TIME switch (S706) to DOUBLE (2.4cm/s). 4. Play back the center portion of tape in REVmode, adjust RV601 so that the reading on the frequency counter becomes 1,500 Hz. Specifications: NORMAL (4.8cm/s) : 2,985Hz - 3,015Hz DOUBLE (2.4cm/s) : 1,485Hz - 1,515Hz 5. Confirm the frequency difference between the beginning and the end of tape should be 1.5%. NORMAL (4.8cm/s) : 45Hz DOUBLE (2.4cm/s) : 22.5Hz Adjustment Location:
[MAIN BOARD] (SIDE B)
TP2 GND

IC1 TP1 IC301

RV602

RV601

RV601: Tape Speed Adjustment (2.4cm/s) RV602: Tape Speed Adjustment (4.8cm/s)

6

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