LG RCT689H Service Manual page 29

VCR ELECTRICAL TROUBLESHOOTING GUIDE
3-3. When the Capstan Motor doesn't run,
When the Capstan Motor doesn't run,
Does
12.5VA appear at PCM01
Pin2?
YES
Does 2.8V
appear at PCM01 Pin9?
YES
Check the PMC01 and the
Capstan Motor Ass'y.
YES
Aren't the foil patterns and Components
between IC501 Pin33 and PMC01 Pin9
short?
YES
Does the
CFG signal come into IC501
Pin67?
YES
Does the
Capstan PWM signal appear at
IC501 Pin33?
YES
Aren't the foil patterns and Components
between IC501 Pin33 and PMC01
Pin9 shorted?
3-4. Keys do not working
Keys do not working
YES
Is 5V
applied to IC601 Pin15,16?
YES
Does K-RTN1,2(IC601 Pin49,50) change
when a function button is pressed?
NO
Refer to "SMPS(CAPSTAN/13.5VA)
Trouble Shooting".
NO
PWM signal appear at
CFG signal appear at
NO
Check the Capstan Motor Ass'y.
Aren't the foil patterns and component
NO
between IC501 Pin67 and PMC01 Pin1
NO
Refer to "SMPS 5.3VA Trouble Shooting".
NO
Replace the defective switches.
3-10
Does the
IC501 Pin33?
NO
Does the
PMC01 Pin1?
NO
shorted?
Replace IC501.