Sharp CD-C471 W Service Manual page 43

Play operation is performed without disc.
The turntable rotates a little.
The turntable fails to rotat
Play operation is performed when disc exits.
Although HF waveform is n
1 .oo v
0.5s
Figure 43
Check IC 2 pin 48 (EFLG).
Check IC2 pins 37,40.
Check IC 601 and POWER AMP IC 901,
As VCO freque-
4.32 M Hz, voltage
of PDO rises and
stabilizes.
Abnomal
The spin driver circuit is normal.
Check the periphery of ICl pins 23 to 27, pin 39, and pin 40, IC2
pin 12 and pin 13, IC3 to CNPB.
Yes
Check PDO waveform (Fig. 43).
I
Abnormal
Check the ICl pins 43 and 44, IC2 pins 3. 5. 7, 10, and 11.
Play
Usually, the number of pulses of flawless disc is 100 pulsesisec
or less.
CD-C471 W