Spin System Check - Sharp XL-MP130 Service Manual

(2) Focus-HF system check.
Check the TE waveform at pin 16 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 15, 16 and 23 on IC1, and
Yes
FFC1.
A normal jump operation cannot be completed or the beginning
of the track cannot be found.
Yes
Check the around pin 23 on IC1.
Data cannot be read. Check the VCO-PLL (Pins 1,2,26,29 and
80 on IC1) system.
The spin driver circuit is OK.
Yes
Check around pin 25 on IC1, pins 5 and 6 on IC2, and CNP2.
7 – 3
XL-MP130
Figure 4
Figure 5