SHARP CPC3H Repair Manual

CD-C3H/CP-C3H
Y Check the tracking system.
Check the waveform of IC1 pin 7 (TE).
The waveform shown in Figure 51-1Check the periphery of IC1 pin 8 to
Tracking servo is inoperative.
appears, and no disc state appearspin 15, and IC3 to CNP2.
YesYes
soon.
Playback is possible in TEST mode.Playback is impossibleNormal jump isCheck the
Yesalthough initializationYesimpeded, and theYesperiphery of IC1
is possible.program toppin 14.
cannot be
reached.
Data cannot be read.Check the VCO-PLL system.
Yes
5ms
1.00 V
IC1 7 TE
4
5 ms
5.0 V
IC1 54 DRF
3
Y Check the spindle system
Play operation is performed without disc.
Figure 51-1
Yes
The turntable rotates a little.The spindle driver is normal.
No
Yes
The turntable fails to rotate or rotates at high speed.Check the periphery of IC1 pin 23 to pin 27, pin 39, pin 40, IC2
No
pin 12, pin 13, from IC3 to CNP3.
Y Checking the VCO-PLL system.
Play operation is performed when disc exists.
Yes
Although the HF waveform is normal, TOC data cannot beCheck the PDO waveform of IC2 pin 3. (Figure 51-2)
read.No
Abnormal
Stop -- > Play
Check the IC1 pin 43, pin 44, IC2 pin 3, pin 5, pin 7, pin 10, and
As VCO frequency is
0.5slocked at 4.32 MHz,pin 11.
1.00 Vvoltage of PDO rises
IC2 3 PDO2and stabilizes.
0.5s
1.00 V
IC1 16 FD
3
Figure 51-2
Y Although HF waveform is normal and time
indication is normal, no sound is not output.
Check the IC2 pin 48 (EFLG).Usually, the number of pulses of flawless disc is 100 pulses/sec
No
or less.
Yes
Check the IC2 pin 37 and pin 40.
Yes
Check IC501 and POWER AMP. IC901.
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