LG RC-185 Service Manual page 109

MECHANISM TROUBLESHOOTING GUIDE
1.Deck Mechanism
A.
Auto REW doesn't work.
YES
Is the supply to the END sensor
END sensor "H"?
"H": more than 3.5V
"L": less than 0.7V~1V
YES
Is the voltage across IR LED
between 0.8~1.5V?
YES
Check syscon circuit.
B.
No F/R modes.
YES
Is the present mode, F/R
Mode?
YES
Does the Capstan Motor rotate?
YES
Does the T/Up, Supply Reel
rotate?
YES
Check syscon circuit.
4-23
NO
Is the Vcc. voltage of End sen-
sor 5V?
YES
Replace End sensor.
NO
Replace LED.
NO
Is the mode SW assembled
correctly (refer to Pages 4-14.)
NO
Is the normal voltage supplied
to the Capstan Motor Vcc1,
Vcc2.?
YES
Is terminal voltage (Vctl) of
Capstan Motor supply side
more than 4V?
YES
Replace the Capstan Motor.
NO
Check the syscon power.
NO
Check Servo, Power Circuits.