Philips PET717 Service Manual page 17

Disc cannot be read .
Disc cannot be read.
Check the FFC connection
between 24P and the loader.
Check whether there is laser
voltage (2.3V for DVD and 1.9V
for CD) on Collector of Q18 and
Q19
Check
peripheral components are
eroded or badly soldered.
Yes
Check if there is RFO signal on
pin15 of XP4. (The normal RFO
signal is a clear reticulated wave)
Check the connection
between U3 and XP4
Replace U3 or loader.
5-3
Yes
Yes
Yes
U2, U5, and
Yes
Yes
No
Check the loaded circuit
Whether peripheral components are
No
eroded or badly soldered.
No
Re-solder or replace the defective parts
No
Check U3 and peripheral components
No
Correct connection
Trouble shooting chart