Read Sharp XL-DAB151PHBK (serv.man3) Service Manual online
XL-DAB151PH
3 – 3
Check the TE waveform at pin 64 on U5.
(2) Tracking system check.
If the waveform shown in Figure 1 appears and soon after NO
DISC appears?
DISC appears?
Yes
The tracking servo is not activated.
Check the peripheral circuits at pins 64 on U5, and CN3.
Check the peripheral circuits at pins 64 on U5, and CN3.
No
"Initialization" is possible, but play is not possible?
Yes
A normal jump operation cannot be completed or the begin-
ning of the track cannot be found.
Check the around pin 63 on U5.
ning of the track cannot be found.
Check the around pin 63 on U5.
No
"Initialization" is not possible.
Data cannot be read. Check the Data (Pin46 on U5) system.
(3) Spin system check.
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
then try starting the play operation.
1. The turntable rotates a little?
(Waveform drawing Figure 3)
(Waveform drawing Figure 3)
Yes
The spin driver circuit is OK.
No
Check around pin 68 on U5, pins 5 and 6 on J13.
2. The turntable doesn't rotate.
MOTO2
FO
1
65
U5
3
68
U5
Figure 3
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