Philips DVP3112, Service Manual, Page: 24 / 55

4-14
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
Remark: Trouble shooting chart for
DVP3142(K/KM)/XX
DVP3144(K)/XX