Sharp CD-C410W Service Manual page 35

• Checking the spin system.
Play operation is performed without disc.
Yes
The turntable rotates a little.
No
The turntable fails to rotate or rotates at high speed.
• Checking the VCO-PLL system
Play operation is performed when disc exits.
Yes
Although 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 35
• Although HF waveform is normal and the time
indication is normal, no sound is emitted.
Check IC 2 pin 48 (EFLG).
Check IC2 pins 37, 40.
Check IC 401 and POWER AMP IC 801.
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CD-C410W/C415W/C420W,CP-C410/C415/SR410
Yes
Yes
Yes
Stop --> Play
As VCO freque-
ncy is locked at
4.32 M Hz, voltage
of PDO rises and
stabili- zes.
2
3
No
Yes
Abnomal
The spin driver circuit is normal.
Check the periphery of IC1 pins 23 to 27, pin 39, and pin 40, IC2
pin 12 and pin 13, IC5 to CNP3.
Check PDO waveform (Fig. 35).
Abnormal
Check the IC1 pins 43 and 44, IC2 pins 3, 5, 7, 10, and 11.
Usually, the number of pulses of flawless disc is 100 pulses/sec
or less.
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