Sharp CD-SW330 Service Manual - Page 94

Check the TE waveform at pin 6 on IC1.,

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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 ? No "Initialization" is possible, but play is not possible ? No "Initialization" is not possible. 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. (3) Spin system check. Press the OPEN/CLOSE switch without inserting a disc, and then try starting the play operation. TEI 46 IC1 FOO 19 IC1 Figure 4 1. The turntable rotates a little ? (Waveform drawing Figure 5) No 2. The turntable doesn't rotate. The spin driver circuit is OK. Yes Check around pin 13 on IC1, pins 3, 4, 13 and 14 on IC2. 1 9 FOO IC1 6 13 DMO IC1 Figure 5 7 - 3

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