LG RC-185 Service Manual page 23

VCR ELECTRICAL TROUBLESHOOTING GUIDE
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn't run,
When the Capstan Motor doesn't run,
Does 12VA appear at PMC01?
Does 2.8V appear at PMC01?
Check the PMC01 and the Capstan
Motor Ass'y.
Aren't the foil patterns and Components
between IC501 Pin33 and PMC01
Pin9 short?
Does the CFG signal come into IC501
Pin67?
Does the Capstan PWM signal appear at
IC501 Pin33?
Aren't the foil patterns and Components
between IC501 Pin33 and PMC01
Pin9 short?
YES
NO
YES
NO
YES
NO
YES
NO
Refer to "SMPS(CAPSTAN/12Volt)
Trouble Shooting".
Does the PWM signal appear at IC501
Pin108?
YES
Does the CFG signal appear at
PMC01 Pin1?
YES
Check the Capstan Motor Ass'y.
Aren't the foil patterns and component
between IC501 Pin67 and PMC01
Pin1 shorted?
Replace the IC501.
3-9
NO
NO