Spin System Check - Sharp XL-DK225 Service Manual

XL-DK225
(2) Focus-RF 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.
Yes
Check the peripheral circuits at pins 15, 16 and 23 on IC1,
and FFC1.
A normal jump operation cannot be completed or the
Yes
beginning of the track cannot be found.
Check the around pin 23 on IC1.
Data cannot be read. Check the VCO-PLL (Pin26~30 on IC1)
system.
TE
3
16
IC1
4
2
RFOUT
IC1
Yes The spin driver circuit is OK.
Check around pin 25 on IC1, pins 1 and 2 on CNP2.
FDO
1
22
IC1
5
SPDO
25
IC1
7 – 3
Figure 4
Figure 5