Aiwa HV-MC90 Service Manual page 39

ELECTRICAL TROUBLESHOOTING -5/13
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn't run,
When the Capstan Motor doesn't run,
Does 12VA appear at the PMC01?
Does 2.8V appear at the PMC01 Pin 4?
Check the PMC01 and the Capstan
Motor Ass'y.
Aren't the foil patterns and Components
between IC501 Pin 10 and PMD01
Pin 4 short?
Does the CFG signal come into the
IC501 Pin 93?
Does the Capstan PWM signal appear at
the IC501 Pin 10?
Aren't the foil patterns and Components
between IC501 Pin 10 and PMC01
Pin 4 short?
YES
NO
YES
NO
YES
NO
YES
NO
Refer to "SMPS(CAPSTAN/12Volt)
Trouble Shooting".
Does the PWM signal appear at the
IC501 Pin 10?
YES
Does the CFG signal appear at the
PMC01 Pin 6?
YES
Check the Capstan Motor Ass'y.
Aren't the foil patterns and component
between IC501 Pin 93 and PMC01
Pin 6 short?
Replace the IC501.
-39-
NO
NO