Aiwa HV-FX7800 Service Manual page 57

ELECTRICAL TROUBLESHOOTING -5/17
C.
Capstan Motor Stopped.
Does 12VA appear at PMD02 Pin 5?
YES
Does 2.8V appear at PMD02 Pin 4?
YES
Check Connector and Capstan
Motor Ass'y.
Check the Components and foil Patterns
Connected between IC501 Pin 108 and
PMD02 Pin 4 for shorts.
Does the CFG signal appear at IC501
Pin 9?
YES
Does Capstan PWM appear at IC501
Pin 108?
YES
Check the components and foil pattern
connected between IC501 Pin 108 and
PMD02 Pin 4 for shorts
NO
NO
YES
YES
NO
NO
Does PWM wave appear at IC501
Pin 108?
Does the CFG signal appear at PMD02
Pin 6?
Check Components and foil patterns
between PMD02 Pin 6 and IC501
Pin 9 for shorts.
-57-
Check Power.
NO
NO
Check Capstan Motor Ass'y.
Replace IC501.