Philips SDV434/19, Service Manual

Page: 11 / 44

4-1
Spindle motor does not move
Yes
Yes
No
No
No
No
Yes
Check whether “AVCC”
(+5V) voltage is normal.
Correct connection
Check the AVCC power
supply
Check/Replace Q8
、
Q9.
Check/ Replace U3.
Have no to focus
1. Check U3 42pin FOO signals
2.If there are F+, F-, T+ and T-
signals output from U2.
Check/Replace the loader
Yes
Yes
No
Go
Check whether laser voltage
(2V for VCD & 2.2V for DVD)
on Collector of Q8 and Q9
Check the FFC connection
between 24P and the loader.
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.
Trouble shooting chart
Motor no move