Smeg GW-P227 Service Manual page 29

TROUBLE DIAGNOSIS
MAIN PCB
Is the connection loose?
No
Main PCB
Is the voltage between pins 4
and pin 6 of CON6 0V or 5V?
Pin4
Pin6
Receiver Voltages
Test Point
pin4 To pin6 0 V or 5 V
Yes
Reconnect
Yes
Replace the
No
Main PCB
Result
Main PCB
Is the voltage between pin4 and
pin5 of CON6 0 V or 5 V?
Pin5
Pin4
Transmitter Voltages
Test Point
pin4 To pin5 0 V or 5 V
Yes
After plug in,
If Er-CO is disappeared,
Explain to the customer!
No
Replace the
Main PCB
Result