LG LH-CX640 Series Service Manual page 63

3-70
B
NO
NO
YES
NO
NO
YES
YES
YES
Does
the
SLED
move
to inner
side
when it
is
at
outter
position?
Motor
Driver
STBY
Pin is
High?
Check
the
connection line of
STBY
signal.
Is
FMSO DC
Level
higher
than
1.4V?
Check
the
related circuit of
FMSO.
SL+
and
SL-
output
properly?
Check
the
amp circuit
on
motor
driver.
Check
the cable
connection
with
MECHA.
Do
not
put in
disc
and
tray
close.
NO
NO
YES
NO
YES
YES
C
Optical
Lens
has
movements
for
searching
Focus?
Proper
FOSO
outputs
to
motor
driver?
Check
FOSO
connection
on
MT1389
and
motor
dirver.
Proper
F+
&
F-
outputs?
Check
the
amp circuit
on
motor
dirver.
Check cable
connect on
with
pick-up
head.