Toshiba SD-170EKB2 Service Manual page 7

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