Toshiba SD-170EKB2 Manuel d'entretien - Page 7

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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

Check

the

connection

between U1 and loader

Yes

Replace U1 or loader.

1-4

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