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