CD-C621H
Y Checking the spin system.
Play operation is performed without disc.
Yes
Yes
The turntable rotates a little.The spin driver circuit is normal.
No
YesCheck the periphery of IC1 pins 23 to 27, pin 39, and pin 40, IC2
The turntable fails to rotate or rotates at high speed.
pin 12 and pin 13, IC5 to CNP3.
Y Checking the VCO-PLL system
Play operation is performed when disc exits.
Yes
Yes
Although HF waveform is normal, TOC data cannot be read.Check PDO waveform (Fig. 42).
Abnormal
Check the IC1 pins 43 and 44, IC2 pins 3, 5, 7, 10, and 11.
Stop --> Play
As VCO freque-
ncy is locked at
4.32 M Hz, voltage
0.5sof PDO rises and
1.00 V
stabili- zes.
IC2 3 PDO
2
0.5s
1.00 V
IC2 16 FD
3
Figure 42
Y Although HF waveform is normal and the time
indication is normal, no sound is emitted.
No
Check IC 2 pin 48 (EFLG).Usually, the number of pulses of flawless disc is 100 pulses/sec
or less.
Yes
Check IC2 pins 37, 40.
Abnomal
Check IC 401 and POWER AMP IC 801.
� 42 � |
ACEC
