Trouble Shooting Chart - Philips MDV434/55/77 Service Manual

Spindle motor does not move
Motor no move
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 Q8 and Q9
1.Whether voltage on pin 44 of U3
varies between 0 and 3.3V (3.3V for
VCD and 0V for DVD),
2.Whether peripheral components
are eroded or badly soldered.
Have no to focus
Check/Replace the loader
Go
Yes
Yes
Yes
Yes
Yes
4-1
No
Correct connection
No
Check the
supply
No
Check/Replace Q8、Q9.
No
Check/ Replace U3.
1. Check U3 42pin FOO signals
No
2.If there are F+, F-, T+ and T-
signals output from U2.

Trouble shooting chart

AVCC power