JVC HR-V506EL Service Manual page 30

B.
Drum Motor stopped.
Does 12V appear at PMC01 Pin 8?
YES
Does 2.8V appear at PMD01 Pin 12?
Check Connector and Drum Motor Ass'y.
Check the Components and foil Pattern
between IC501 Pin 26 and PMC01
Pin 12 for shorts.
Do DFG Pulses appear at IC501 Pin 104?
YES
Does the Drum PWM waveform
appear at IC501 Pin 107?
YES
Check the Components and foil Pattern
Connected to IC501 Pin 107 PMC01
Pin 12 for shorts.
NO
NO
YES
YES
NO
NO
Does Drum PWM appear at IC501 Pin
Do DFG Pulses appear at PMD01 Pin 3?
Check Drum Monitor Ass'y.
Check the Components and foil pattern
between PMC01 Pin 11 and IC501
Pin 104 for shorts.
3-8
Check Power.
107?
NO
NO
Replace IC501.