Trouble Shooting Chart - Philips DVP520 Service Manual

Spindle motor does not rotate
Motor
Check the FFC connection
between 24P and the loader.
Check whether "AVCC"
(+5V) voltage is normal.
Check whether laser voltage
(2V for VCD & 2.2V for DVD)
on Collector of Q5 and Q6
1.Whether voltage on pin 52 of U1
varies between 0 and 3.3V (3.3V for
VCD and 0V for DVD),
2.Whether peripheral components
are eroded or badly soldered.
Check whether the
pich-up doesn't focus
Check/Replace the loader
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does not rotate
Go
Yes
Yes
Yes
Yes
Yes
4-1
No
Fix connection
No
Check the
supply
No
Check/Replace Q5 Q6.
No
Check/ Replace U1.
1.Check there is signal from pin 12
No
and pin 13 of U3 to pin 1 and pin 26
of U2,
2.Check whether there are F+, F-,
T+ and T- signals from U2.

Trouble shooting chart

AVCC power