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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 QTCD161H 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 28 (click to view)
⢠Playback can only be performed when a disc is loaded.

Is the Focus servo active? (Can you hear it working?) No Yes

Check the laser diode driver. Check the area around IC801(16) - (21) (focus servo circuit).

Yes Does the DRF signal change from "L" to "H"? No Yes Yes Is HF waveform normal (see the Fig. 28-1, 2)? Yes Check the tracking system. Waveform is unstable. No
Level is abnormal.

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

Check the spin system.

Check the periphery of IC801 pins 41 and 42. Yes

Check the spin system.

HF 0.1V/DIV 0.5µsec/DIV(DC) IC801 41 (When playing back the disc)

0.5s 1.00 V IC801 16 FD 0.5s 10.0 V IC801 12 CLV+ 0.5s 10.0 V IC801 54 DRF 0.5s 2.00 V IC801 7 TE

Waveform in case of normal playback

2 1 3 4

Figure 28-1 ⢠Check the tracking system.
Check waveform of IC801 pin 7 (TE).

Figure 28-2

The waveform shown in Fig. 28-3 appears, and no-disc state appears soon.


Tracking servo is inoperative.


Check the periphery of IC801 pin 8 to pin 15, and IC803 to BI801/CNS801.

Play is possible in TEST mode.


The unit will be initialzed in Normal mode, but Yes it will not play back.

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


Check the periphery of IC801 pin 14.

Data cannot be read.

5ms 1.00 V IC801 7 TE

Check the VCO-PLL system.


5 ms 5.0 V IC801 54 DRF


Figure 28-3 â 28 â

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