Toshiba BDX2500KU, Service Manual

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11-6
Trouble shooting chart
Disc cannot be read.
Disc cannot be read.
Check the FFC connection
between 45P and the loader.
Check whether there is laser
voltage (2.3V for DVD and 1.9V
for CD& 8V for BD) on Collector of
Q4504,Q4506 and Q4502.
Check IC4001, IC4402, and
peripheral components are
eroded or badly soldered.
Yes
Yes
Yes
Yes
Yes
Yes
Replace IC4001 or loader or replace Main PCB.
Check the loaded circuit.
Correct connection.
No
No
No
No
No
Check the connection
between IC4001.
Check if there is RF± signal on
pin22,23 of CN4501. (The normal RF±
signal is a clear reticulated wave)
1.Check voltage on pin C11,C10,B10 of
IC4001 varies between 0 and 3.3V :
3.3V for CD
0V for DVD
8V for BD
2.Check whether peripheral components
are eroded or defect. If not, replace
Main PCB.
Re-sloder or replace the defective parts
or replace Main PCB.
Check IC4402 and peripheral
components or replace Main PCB.