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5-4
Disc cannot be read.
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
Disc cannot be read.
Check the loaded circuit
1.Check voltage on pin 97 of U2 varies
between 0 and 3.3V:
Æ3.3V for CD
Æ0V for DVD
2.Check whether peripheral components
are eroded or defect
Check the FFC connection
between 24P and the loader.
Check U1 and peripheral components
Re-solder or replace the defective parts
Check the connection
between U2
Correct connection
Replace U2 or loader.
Yes
Check whether there is laser
voltage (2.3V for DVD and 1.9V
for CD) on Collector of Q4 &Q5
Check if there is RFO signal on
pin10 of XP7. (The normal RFO
signal is a clear reticulated wave)
Trouble shooting chart
Check U2, U4, and
peripheral components are
eroded or badly soldered.