Trouble shooting chart | |
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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 (2.3V for DVD and 1.9V for CD) on Collector of Q4 &Q5
Yes
Check U2, U4, and peripheral components are eroded or badly soldered.
Yes
Check if there is RFO signal on pin10 of XP7. (The normal RFO signal is a clear reticulated wave)
Yes
Check the connection between U2
Yes
No
No
No
No
No
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 U1 and peripheral components
Correct connection
Replace U2 or loader.
