Read Sharp CD-C3H (serv.man12) Service Manual online
CD-C3H/CP-C3H
– 51 –
• Although HF waveform is normal and time
indication is normal, no sound is not output.
Check the IC2 pin 48 (EFLG).
Check the IC2 pin 37 and pin 40.
Check IC501 and POWER AMP. IC901.
Yes
Yes
No
Usually, the number of pulses of flawless disc is 100 pulses/sec
or less.
or less.
Data cannot be read.
Check the waveform of IC1 pin 7 (TE).
The waveform shown in Figure 51-1
appears, and no disc state appears
soon.
appears, and no disc state appears
soon.
Yes
Check the periphery of IC1 pin 8 to
pin 15, and IC3 to CNP2.
pin 15, and IC3 to CNP2.
Tracking servo is inoperative.
Yes
Yes
Playback is possible in TEST mode.
Yes
Normal jump is
impeded, and the
program top
cannot be
reached.
impeded, and the
program top
cannot be
reached.
Playback is impossible
although initialization
is possible.
although initialization
is possible.
Yes
Yes
Check the
periphery of IC1
pin 14.
periphery of IC1
pin 14.
Figure 51-1
3
4
5ms
1.00 V
IC1 7 TE
1.00 V
IC1 7 TE
5 ms
5.0 V
IC1 54 DRF
5.0 V
IC1 54 DRF
Yes
Yes
The turntable rotates a little.
The turntable fails to rotate or rotates at high speed.
The spindle driver is normal.
No
Play operation is performed when disc exists.
Yes
Although the HF waveform is normal, TOC data cannot be
read.
read.
No
Check the periphery of IC1 pin 23 to pin 27, pin 39, pin 40, IC2
pin 12, pin 13, from IC3 to CNP3.
pin 12, pin 13, from IC3 to CNP3.
No
Check the PDO waveform of IC2 pin 3. (Figure 51-2)
Check the IC1 pin 43, pin 44, IC2 pin 3, pin 5, pin 7, pin 10, and
pin 11.
pin 11.
Abnormal
Figure 51-2
Stop -- > Play
As VCO frequency is
locked at 4.32 MHz,
voltage of PDO rises
and stabilizes.
locked at 4.32 MHz,
voltage of PDO rises
and stabilizes.
2
3
0.5s
1.00 V
IC2 3 PDO
1.00 V
IC2 3 PDO
0.5s
1.00 V
IC1 16 FD
1.00 V
IC1 16 FD
