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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 (1.9V for CD and 2.4V for
DVD) on L9 and L10.
Yes
Check
peripheral components are
eroded or badly soldered.
Yes
Check if there is RFO signal on
pin17 of XP2. (The normal RFO
signal is a clear reticulated wave)
Yes
Check the connection
between U20
Yes
Replace U20 or loader.
U20,
U2,
and
4-4
No
Check the loaded circuit
1.Check voltage on pin 15 of U20 varies
between 0 and 3.3V:
No
3.3V for CD
0V for DVD
2.Check whether peripheral components
are eroded or defect
No
Re-solder or replace the defective parts
No
Check U20 and peripheral components
No
Correct connection
Trouble shooting chart
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