LG MICRO Hi-Fi SYSTEM Service Manual page 27

C
YES
NO
Focus on ok?
YES
NO
Tracking ok?
YES
Disc play?
YES
D
Proper signal on
A,B,C,D from MD?
YES
Proper FOD signal on
IC401?
YES
Check cable connection
between P405 and MD
Proper TRD signal on
IC401?
YES
T+ & T- output
properly?
YES
Check cable connection on
pick-up head
NO
Check RF signal waveform
3-14
NO
Check the connections between
P405 and pick-up head
NO
Check the related circuit of
ES8391 focus signal
NO
Check the related circuit
between IC401 and ES8391
NO
Check the tracking control
on motor driver (IC401)