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SONY CXJS77
Service Manual


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

Description of SONY CXJS77 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 21 (click to view)
CX-JS77 SECTION 5 ELECTRICAL ADJUSTMENTS
CD SECTION
Note: 1. CD Block is basically designed to operate without adjustment. Therefore, 2. 3. 4. check each item in order given. Use YEDS-18 (3-702-101-01) unless otherwise indicated. Use an oscilloscope with more than 10MΩ impedance. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

RF signal waveform VOLT/DIV : 200mV TIME/DIV : 500ns

level : 1.3 ± 0.3 Vp-p

S-CURVE CHECK
Oscilloscope CD board TP(FE) TP(VC)

– CD BOARD (Conductor Side) –

Procedure : 1. Connect an oscilloscope to TP (FE) and TP (VC) on the CD board. 2. Press the I/1 button to 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

TP (VC)

TP (FE) IC101

A within 3 ± 0.5 Vp-p B

TP (RFACO)

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.

Connecting Location: CD board

RFAC LEVEL CHECK
oscilloscope CD board TP(RFACO) TP(VC)

Procedure : 1. Connect an oscilloscope to TP (RFACO) and TP (VC) on the CD board. 2. Press the I/1 button to turn the power ON. 3. Load a disc (YEDS-18) and playback. 4. Confirm that oscilloscope waveform is clear and check if RFAC signal level is correct or not.
Note: Clear RFAC signal waveform means that the shape “ ◊ ” can be clearly distinguished at the center of the waveform.

Connecting Location: CD board

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