Sharp CD-C1W Service Manual page 45

• Check the tracking system.
Check the waveform of IC1 pin 7 (TE).
The waveform shown in Figure 45-1
appears, and no disc state appears
soon.
Playback is possible in TEST mode.
Data cannot be read.
• Check the spindle system
Play operation is performed without disc.
Yes
The turntable rotates a little.
Yes
The turntable fails to rotate or rotates at high speed.
• Checking the VCO-PLL system.
Play operation is performed when disc exists.
Yes
Although the HF waveform is normal, TOC data cannot be
read.
0.5s
1.00 V
IC2 3 PDO
0.5s
1.00 V
IC2 16 FD
Figure 45-2
• 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.
All manuals and user guides at all-guides.com
Tracking servo is inoperative.
Yes
Playback is impossible
Yes
although initialization
is possible.
Yes
No
No
No
Stop -- > Play
As VCO freque-
ncy is locked at
4.32 MHz, voltage
of PDD rises and
stabili- zes.
2
3
Yes
Yes
– 45 –
Yes
Normal jump is
Yes
impeded, and the
program top
cannot be
reached.
Check the VCO-PLL system.
5ms
1.00 V
IC1 7 TE
5 ms
5.0 V
IC1 54 DRF
Figure 45-1
The spindle driver is normal.
Check the periphery of IC1 pin 23 to pin 27, pin 39, pin 40, IC2
pin 12, pin 13, from IC3 to CNP3.
Check the PDD waveform of IC2 pin 3. (Figure 45-2)
Check the IC1 pin 43, pin 44, IC2 pin 3, pin 5, pin 7, pin 10, and
pin 11.
Usually, the number of pulses of flawless disc is 100 pulses/sec
No
or less.
CD-C1W,CP-C1W
Check the periphery of IC1 pin 8 to
pin 15, and IC5 to CNP2.
Check the
Yes
periphery of IC1
pin 14.
4
3
Abnormal