LG DP372D Service Manual page 19

D
Focus
on OK?
YES
Track
on OK?
YES
Disc is play?
YES
E
LGE Internal Use Only
Proper
NO
signals on A,B,C,D of
1389P
Check
FOD signal on
1389P
FCS+ & FCS-
output properly?
Check cable connection
on pick-up head.
Properly
NO
TRD signal on
1389P?
TRK+ & TRK-
output properly?
Check cable connection
on pick-up head.
NO
Check RF signal waveform.
3-8
NO
YES
NO
YES
YES
NO
YES
NO
YES
Copyright © 2008 LG Electronics. Inc. All right reserved.
Check connections between
1389P and pick-up head.
Check the FOD connection on
1389P and motor driver.
Check the focus control
amp circuit on motor driver
Check the TRD
connection on 1389P
and motor driver
Check the tracking control
amp circuit on motor driver
Only for training and service purposes