SHARP GX-CD30C Repair Manual

GX-CD30/30C/130/130C
Y Checking the spin system.
Play operation is performed without disc.
Yes
t
The turntable rotates a little.tThe spin driver circuit is normal.
Yes
No
t
The turntable fails to rotate or rotates at high speed.tCheck the periphery of IC801 pins 23 to 27, pin 39 and pin 40,
YesIC802 pin 12 and pin 13, IC804 to BI803/CNS803.
Y Checking the VCO-PLL system
Play operation is performed when disc exits.
Yes
t
Although HF waveform is normal, TOC data cannot be read.t Check PDO waveform (Fig. 12).
Yes
Error
t
Check the IC801 pins 43 and 44, IC802 pins 3, 5, 7, 9 and 10.
Stop --> Play
As VCO freque-
ncy is locked at
0.5s
4.32 M Hz,
1.00 V
IC802 3 PDO2voltage of PDO
0.5srises and stabili-
1.00 Vzes.
IC801 16 FD
3
Figure 12
Y Although HF waveform is normal and the time
indication is normal, no sound is emitted.
Check IC802 pin 48 (EFLG).tUsually, the number of pulses of flawless disc is 100 pulses/
No
sec or less.
Yes
t
Check IC802 pins 37and 40.
Abnomal
t
Check the periphery of IC803 (OPAMP).
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