4-4
Disc cannot be read.
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
Disc cannot be read.
Check the loaded circuit
1. Whether voltage on pin14/pin15 of U1
varies between 2.4V and 3.3V (PIN14=2.4V
and PIN15=3.3V for CD;PIN14=3.3V and
PIN15=2.4V 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 U1
Correct connection
Replace U1 or loader.
Yes
Check whether there is laser voltage
(1.9V for CD and 2.4V for DVD) on
L101(R35) and L102(R32)
Check if there is RFO signal on
pin17 of XP2. (The normal RFO
signal is a clear reticulated wave)
Trouble shooting chart
Check U1, U10, and
peripheral components are
eroded or badly soldered.