LG FB163U Service Manual page 48

C
YES
Focus On OK?
YES
Tracking OK?
YES
Disc play?
YES
D
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
NO
Proper signal on
A,B,C,D from MD?
YES
Proper FOD signal on
IC401?
YES
Check cable connection
between PN4401 and MD.
NO
Proper TRD signal on
IC401?
YES
T+ & T- output
properly?
YES
Check cable connection on
pick-up head.
NO
Check RF signal waveform.
3-35
NO
Check the connections between
PN4401 and pick-up head.
NO
Check the related circuit of
ES8390 FOCUS signal.
NO
Check the related circuit
between IC401 and ES8390.
NO
Check the Tracking control
on motor driver (IC401).
LGE Internal Use Only