SHARP CD-C1600C
Instrukcja Serwisowa

CD-C1600C
� Playback can only be performed when a disc is loaded.

Is the Focus servo active? (Can you hear it working?) Yes Does the DRF signal change from "L" to "H"?

No

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

No Yes Is HF waveform normal (see the Fig.40-1,2)? Yes Check the tracking system. No

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

Check the spin system. Yes

Level is abnormal. Yes Waveform is unstable. Yes

Check the periphery of IC1 pins 41 and 42. Check the spin system.

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

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

Waveform in case of normal playback

2 1 3 4

Figure 40-1 � Check the tracking system.
Check waveform of IC1 pin 7 (TE).

Figure 40-2

The waveform shown in Fig. 40-3 appears, and nodisc state appears soon.

Yes

Tracking servo is inoperative. Yes

Check the periphery of IC 1 pin 8 to pin 15, and IC 5 to CNP2.

Play is possible in TEST mode.

Yes

Although IL is possible, play is impossible. Yes

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

Check the periphery of IC 1 pin 14.

Data cannot be read.

Yes

Check the VCO-PLL system.

5ms 1.00 V IC1 7 TE

4

5 ms 5.0 V IC1 54 DRF

3

Figure 40-3
� 40 �