LG DK763X Service Manual page 19

D
Focus ON OK?
YES
Track On OK?
YES
Disc is play ?
YES
E
NO
Proper signals on A, B, C,
D of MT1389E
Check FEO signal on
MT1389E
Check FOSO signal on
MT1389E
NO
Normal TEO Signal on
MT1389E?
Properly TRSO signal on
MT1389E?
T+ & T- output properly?
Check cable connection on
pick-up head.
NO
Check RFO & RFLVL signal
waveform.
3-8
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check connections between
MT1389E and pick-up head.
Check the FOSO
connection on MT1389E
and motor driver.
Check the related circuit on
MT1389E
Check the TRSO
connection on MT1389E
and motor dirver.
Check the tracking control
amp circuit on motor driver.