Sony AVD-K150B Service Manual page 22

Dvd/vcr receiver
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AVD-K150B/K150E/K150G/K150N/K150R
(4) KEY doesn't working
KEY doesn't working.
Is 5V applied to the IC501
Pin36?
YES
Does LED or FLD change
when a function button is
pressed?
22
NO
Refer to "SMPS 5.3VA
Trouble Shooting".
NO
Replace the defective
switches.

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