LG LH-CX640 Series Service Manual page 65

3-72
D
E
Normal
TEO
Signal on
MT1389?
Check
the
related
circuit
on
MT1389
Track
On OK?
Properly
TRSO
signal
on MT1389?
T+ &
T-
output
properly?
Check
the TRSO
connectionon
MT1389
and
motor
dirver.
Check
the
tracking
control
amp circuit
on
motor
driver.
Check
cable
connectionon
pick-up
head.
Disc is
play ? Check
RFO &
RFLVL
signal waveform.
Focus
ON
OK?
Proper signals on
A,B,C,D
of
MT1389
Check
connections
between
MT1389
and
pick-up
head.
Check FEO
signal
on
MT1389
Check
FOSO
signal
on
MT1389
Check
the
FOSO
connection
on
MT1389
and
motor
driver.
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO