Deck Mechanism - LG LH-CX640 Series Service Manual

MECHANISM
TROUBLESHOOTING
GUIDE
4-23
No
Auto
Rewind
operates.
Is
output
of
the
end
sensor
\"H\"?
\"H\": 3.5V
or
less
\"L\":
0.7V
--1V
or
less
Is
voltage
at
both
ends of
the
IR
LED
0.8V-1.5?
Replace
the
LED.
Is the
end
sensor
Vcc
applied
at
5V?
Check the
Syscon power
supply.
Replace
the
end
sensor.
Is
the
Syscon
checked?
NO
YES
YES
YES
YES
NO
NO
1.Deck
Mechanism
A.
NO
NO
NO
No F/R
operates.
Is the
current
mode
an
F/R
mode?
Check the
assembly
position
of
the
Mode
S/W.
Is
normal
voltage
applied
at
the
Vcc1
and
the
Vcc2 of
the
Capstan
motor?
Is the
Vctl
terminal
voltage
of
the
Capstan
Motor
applied
at
more
than
4V?
Check the
Servo,
Power
circuit.
Replace
the
Capstan motor.
Does the
Capstan
motor
rotate?
Does
the
T/up
and
the
supply
reel
Operate?
Check the
Syscon
circuit.
YES
YES
YES
YES
YES
YES
B.