LG LH-T3520X Service Manual page 18

D
YES
Focus on ok?
YES
Track On OK?
YES
Disc Playback?
YES
E
Proper
NO
signals on A, B, C,
D of MT1389/L.
YES
Proper
CD-DVDCT signal
on MT1389/L.
YES
Check CD_DVDCT connection
between AM5890 and
MT1389/L.
Proper
NO
CD-DVDCT signal
on MT1389/L.
YES
Proper
TRACK signal
on MT1389/L.
YES
TR+ & TR-output
properly?
YES
Check cable connection
on pick-up head.
NO
Check RF signal waveform.
2-9
NO
Check connections between
MT1389/L and pick-up head.
NO
Check the related circuit on
MT1389/L CD-DVDCT.
NO
Check the related circuit on
MT1389/L.
NO
Check the TRACK connection
on MT1389/L and motor driver.
NO
Check the tracking control amp
circuit on motor driver.