Sharp CD-SW330 Service Manual page 94

CD-SW330
(2) Tracking system check.
Check the TE waveform at pin 6 on IC1.
If the waveform shown in Figure 4 appears and soon after NO
DISC appears ?
"Initialization" is possible, but play is not possible ?
"Initialization" is not possible.
(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 5)
2. The turntable doesn't rotate.
No
No
No
The tracking servo is not activated.
Check the peripheral circuits at pins 6, 7, 10, 98 and 100 on
Yes
IC1, pins 17, 18, 35 and 36 on IC2 and FFC1.
A normal jump operation cannot be completed or the
beginning of the track cannot be found.
Yes
Check the around pin 10 on IC1.
Data cannot be read. Check the VCO-PLL (Pins 72, 73, 74,
75, 76 and 78 on IC1) system.
TEI
4
6
IC1
FOO
1
9
IC1
The spin driver circuit is OK.
Yes
Check around pin 13 on IC1, pins 3, 4, 13 and 14 on IC2.
FOO
1
9
IC1
DMO
6
13
IC1
7 – 3
Figure 4
Figure 5