Sharp GX-CD30 Service Manual page 12

GX-CD30/30C/130/130C
• Checking the spin system.
Play operation is performed without disc.
The turntable rotates a little.
The turntable fails to rotate or rotates at high speed.
• Checking the VCO-PLL system
Play operation is performed when disc exits.
Although HF waveform is normal, TOC data cannot be read.
0.5s
1.00 V
IC802 3 PDO
0.5s
1.00 V
IC801 16 FD
• Although HF waveform is normal and the time
indication is normal, no sound is emitted.
Check IC802 pin 48 (EFLG).
Check IC802 pins 37and 40.
Check the periphery of IC803 (OPAMP).
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Yes
No
Yes
Stop --> Play
As VCO freque-
ncy is locked at
4.32 M Hz,
voltage of PDO
2
rises and stabili-
zes.
3
Figure 12
Yes
Abnomal
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The spin driver circuit is normal.
Yes
Check the periphery of IC801 pins 23 to 27, pin 39 and pin 40,
Yes
IC802 pin 12 and pin 13, IC804 to BI803/CNS803.
Check PDO waveform (Fig. 12).
Yes
Error
Check the IC801 pins 43 and 44, IC802 pins 3, 5, 7, 9 and 10.
Usually, the number of pulses of flawless disc is 100 pulses/
No
sec or less.
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