4-4
Disc cannot be read
.
No
Yes
No
Yes
Yes
Yes
No
No
No
Yes
Disc cannot be read.
Check the loaded circuit
Check whether peripheral
components are eroded or defect
Check the FFC connection
between 24P and the loader.
Check U3 and peripheral components
Re-solder or replace the defective
parts
Check the connection between
CN7 and FCC cable
Correct connection
Replace U3 or loader.
Yes
Check whether there is
laser voltage (2V for VCD
and 2.2V for DVD) on
Collector of Q5 &Q6
Check if there is RFO signal
on pin10 of CN7. (The
normal RFO signal is a clear
reticulated wave)
Trouble shooting chart
Check U3, U4, and
peripheral components are
eroded or badly soldered.
