LG LH-CX640 Series Service Manual page 127

4-25
MECHANISM
TROUBLESHOOTING
GUIDE
No
tape
winding
is
done
in
play.
Is
the
pinch
roller
attached
to the
Capstan
shaft
in
operation
of
play?
Check
the
assembly
mode?
Does
the
T/up
reel
operate? Hang the
Capstan belt.
Is the
Capstan
belt
hung?
Does
the
drum motor
turn?
Is
the
DPG, DFG
normal?
Are
the
T/up
and
the
reel
sensor
normal?
Check
the
Syscon
circuit.
Check the
Syscon
circuit.
Check
the
Syscon
circuit.
Does the
Capstan
motor
turn?
Is
the
Vctl
terminal
voltage of
the
drum
motor at
more
than
2.3V?
Replace
the
drum motor.
Is the
Vcc voltage of
the
drum
motor
normal?
Check
the
clutch
and
the
idler
assembly.
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is the
Vctl
terminal
voltage
of
the
Capstan motor applied
at
more
than
4V?
Replace the
Capstan
motor.
Is
normal
voltage
applied to the
capstan
motor
Vcc1,
Vcc2?
YES
YES
YES
Check
the
Servo,
power
circuit.
NO
NO
NO
E.