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