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SONY HCD-GTX88
Service Manual


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

Description of SONY HCD-GTX88 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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Text excerpt from page 29 (click to view)
HCD-GTX88

3. Mode: Playback
test tape P-4-A100 (10 kHz, –10 dB) L-CH MAIN board CN510 R-CH pin 3 waveform of oscilloscope

CD SECTION [TEST DISC LIST]
pin 1 L R pin 2 V H oscilloscope

Use the following test disc on test mode. • CD: YEDS-18 (PART No. 3-702-101-01) or PATD-012 (PART No. 4-225-203-01) Note: 1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10MW impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

in phase 45° good

90° 135° 180° wrong

[S-CURVE CHECK]
4. After the adjustments, apply suitable locking compound to the pats adjusted.
BD91 board oscilloscope

Adjustment Location: Playback Head (Deck A). Record/Playback/Erase Head (Deck B).

TP106(FE) TP124(VC)

+ –

Procedure : 1. Connect an oscilloscope to TP106 (FE) and TP124 (VC). 2. Turn the power on. 3. Load a disc (YEDS-18) and actuate the focus search. (In consequence of open and close the disc tray, actuate the focus search) 4. Confirm that the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 3 ± 0.5 Vp-p.
S-curve waveform symmetry

A
forward reverse

within 3 ±0.5Vp-p B

Note: • Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7. • Take sweep time as long as possible and light up the brightness to obtain best waveform.

29

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