9-20
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Only training and service purposes
F3 error (Button short error)
Or button does not input
CHECKING FLOW CHART BY FAILURE
Check the beep sound.
Does the beep sound when the power is turned on
again?
No
Replace the Main PCB
1
Yes
Unplug the unit
Is the connector disconnected or loose?
Check : CN20
Is it OK?
Yes
No
Reconnect or adjust
the connection
4
CN20
CN20
Replace the Display PCB
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