The tracking servo is not activated.
Check the peripheral circuits at pins 18 and 19 on IC1, pin 23 on
IC2, and CNS1A/B.
If the waveform shown in Figure 39-1 appears and soon after
NO DISC appears.
(2) Tracking system check
Check the TE waveform at pin 18 on IC1.
A normal jump operation cannot be completed or the beginning of
the track cannot be found.
Check the around pin 23 on IC2.
"Initialization" is possible, but play is not possible.
Data cannot be read. Check the VCO-PLL system.
"Initialization" is not possible.
Figure 39-1
Figure 39-2
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
(3) Spin system check
The spin driver circuit is OK.
1. The turntable rotates a little. (Waveform drawing
Figure 39-2)
Check around pin 25 on IC2, pins 15 and 16 on IC3, and CNS3A/B.
2. The turntable doesn't rotate.
No
Yes
No
Yes
Yes
No
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