Service manual

MD-X5H/CP-X5H
– 72 –
• Check the VCO-PLL system.
Playback operation is performed when disc exists.
Yes
Although the HF waveform is normal, the TOC data cannot
be read.
No
• The HF waveform is normal and time indication is
also normal, but sound is not output.
Check the IC2 pin 48 (EFLG).
Check the IC2 pin 37 and pin 40.
Check IC401 and power amplifier IC801.
Yes
Yes
No
Check the PDD waveform. (Figure 72)
Check the IC1 pin 43, pin 44, IC2 pin 3, pin 5, pin 7, pin 10, and
pin 11.
Usually, the number of pulses of normal disc is 100 pulses/sec or less.
Abnormal
Figure 72
2
3
0.5s
1.00 V
IC2 3 PDO
0.5s
1.00 V
IC2 16 FD
Stop → Play
As VCO frequency
is locked at 4.32 MHz,
voltage of PDO rises
and stabili-zes.