Toshiba SD-270EKB2, Руководство по обслуживанию

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1 -4
Disc cannot be read .
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
Disc cannot be read.
Check the loaded circuit
1.Check voltage on pin 100 of U1
varies between 0 and 3.3V:
Æ 3.3V for CD
Æ
0V 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
Correct connection
Replace U1 or loader.
Yes
Check whether there is
laser voltage (2.3V for DVD
and 1.9V for CD) on
Collector of Q2 &Q3
Check if there is RFO signal
on pin10 of CN2. (The
normal RFO signal is a clear
reticulated wave)
Check U1, U7, and
peripheral components are
eroded or badly soldered.
Trouble shooting chart
Check the connection
between U1 and loader