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9. Flow Chart of TroubleShooting
9-1
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9-1. Logic Section
9-1-1 : No Power
Press PWR KEY
U514 pin4
output high?
Check pin #1 and #2
if One of them is low,
replace board
TR502 pin1
output higher 3.5V?
Check TR502, TR503,
and neighboring circuits
Replace board if required
END
NO
NO
YES
YES
