Sharp XL-DV60 Service Manual page 53

(2) Tracking system check.
Check the TE waveform at pin 39 on U7.
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
Check the J5 connect well
or not
No
The tracking servo is not activated.
Check the peripheral circuits at pin 39 on U7, and Pin 145 on
Yes
U9 and FFC1B.
Check the CNP802 and J5 connect well or not.
Yes
The spin driver circuit is OK.
Yes
Check around pins 17,18 on U8.
7 – 3
XL-DV60
Figure 4
Figure 5