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Service Manual

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

Description of SHARP CDC477H 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 51 (click to view)
• Playback can only be performed when a disc is loaded.
Is the Focus servo active? (Can you hear it working?) Yes Yes Does the DRF signal change from "L" to "H"? Yes Yes Is HF waveform normal (see the Fig.51-1, 2)? Yes Check the tracking system. Waveform is unstable.
0.5s 1.00 V IC1 16 FD 0.5s 10.0 V IC2 13 CLV+ 0.5s 10.0 V IC1 54 DRF 0.5s 2.00 V IC1 7 TE


Check the laser diode driver. Check the area around IC1(16) - (21) (focus servo circuit).


If the disc is not turning, the DRF should not change to "H".

Check the spin system.


Level is abnormal. Yes

Check the periphery of IC1 pins 41 and 42.

Check the spin system.
Waveform in case of normal play-back

HF 1.0V/DIV 0.5µsec/DIV(DC) (When playing back the disc)

2 1 3 4

Figure 51-1 • Check the tracking system.

Figure 51-2

Check waveform of IC1 pin 7 (TE).

The waveform shown in Fig.51-3 appears, and nodisc state appears soon.


Tracking servo is inoperative. Yes

Check the periphery of IC 1 pin 8 to pin 15, and IC 3 to CNP2.

Play is possible in TEST mode.


Although IL is possible, play is impossible.


Normal jump is impeded, and the program top cannot be reached.


Check the periphery of IC 1 pin 14.

Data cannot be read.


Check the VCO-PLL system.

5ms 1.00 V IC1 7 TE


5 ms 5.0 V IC1 54 DRF


Figure 51-3 – 51 –

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