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5. Repair Flow Chart
No Picture (LED Orange)
Check key board/IR board
Check 43V power supply
Check main board standby power supply
No picture
OK
OK
OK
OK
Check U401
OK
2
Check I
C bus
NG
Change key board/IR board
NG
Check the power supply circuit
NG
Change U751
NG
Change U401
NG
2
Check I
C communication
20
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