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CD-SW440N
(2) Tracking system check.
Check the TE waveform at pin 14 on U10.
If the waveform shown in Figure 3 appears and soon after NO
DISC appears?
"Initialization" is possible, but play is not possible?
TEI
4
14
U10
FOO
1
126
U10
Figure 3
(3) Spin system check.
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
1. The turntable rotates a little?
(Waveform drawing Figure 4)
2. The turntable doesn't rotate.
FOO
1
126
U10
DMO
5
123
U10
Figure 4
No
No
The tracking servo is not activated.
Check the peripheral circuits at pins 2, 3, 14 and 127 on U10,
Yes
pins 15, 16 and 26 on U12 and FFC.
A normal jump operation cannot be completed or the
beginning of the track cannot be found.
Yes
Check the around pin 127 on U10.
The spin driver circuit is OK.
Yes
Check around pin 123 on U10, pins 17, 18 and 23 on U12.
7 – 3
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