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Replace the
Main PCB
After plug in,
If Er-CO is disappeared,
Explain to the customer!
Replace
Main PCB
Main PCB
Is the connection loose?
Main PCB
Is the voltage between
pin2 and pin4 of CON5
0 V or 5 V?
Main PCB
Is the voltage between
pins 2 and pin 3 of
CON5 0V or 5V?
No
Yes
Yes
Yes
Reconnect
pin2 BO
pin3 BN
pin2 BO
pin4 RD
Transmitter Voltages
Receiver Voltages
No
No
0 V or 5 V
pin2 to pin3
RessultTest Point
0 V or 5 V
(1) to (2)
RessultTest Point