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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
U405 pin4
output high?
Check pin1 and pin2
if One of them is low,
replace board
TR403 pin3
output low?
Replace TR403
NO
NO
YES
YES
U408 pin2
output high?
Replace U408
NO
TR402 pin1 VBAT
output > 3.5V?
Replace TR402
END
YES
NO
YES