Philips DVP3980KX/77, Service Manual, Page: 7 / 36

3-1
Spindle m otor does not m ove
I
Yes
Yes
No
No
No
No
Yes
Check whether “VCC”
(+5V) voltage is normal.
Correct connection
Check the VCC power supply
Check/Replace Q13 ǃ Q14
Check/ Replace U1
Have no to focus
1. Check U1 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 Q13 and Q14
Check the FFC connection
between 24P and the loader.
1.Whether voltage on pin 54 of
U1varies 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