Aiwa HV-MC90 Service Manual page 47

ELECTRICAL TROUBLESHOOTING -13/13
(3) KEY doesn't working
KEY doesn't working.
Is 5VA applied to the IC501
Pin 14?
YES
Does LED display change
when a function button is
pressed?
NO
Refer to "SMPS 5.3VA
Trouble Shooting".
NO
Replace the defective
switches.
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