Table of Contents
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Disc cannot be read .
Disc cannot be read.
Yes
Check the FFC connection
between 24P and the loader.
Yes
Check whether there is laser
voltage (2V for VCD and 2.2V for
DVD) on Collector of
Yes
CheckU1,U2,and peripheral
components are eroded or
badly soldered.
Yes
Check if there is RFO signal on
pin8 of XP5. (The normal RFO
signal is a clear reticulated wave)
Yes
Check the connection
between U1
Yes
Replace U1 or loader.
5-4
No
No
Q13 Q14.
No
No
No
Check the loaded circuit
1.Check voltage on pin 54 of U1 varies
between 0 and 3.3V:
3.3V for VCD
0V for DVD
2.Check whether peripheral components
are eroded or defect
Re-solder or replace the defective parts
Check U1 and peripheral components
Correct connection
Trouble shooting chart
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