Communication Error - Kenmore 795.78773.801 Service Manual

Communication Error

CON5
MAIN
PCB
Is Er-CO displayed?
Yes
Display PCB
Is the connection loose?
No
Display PCB
Is the voltage between
pins 4 and pin 5 of
CON101?
pin5 BO
pin4 BN
Receiver fail Voltages
Test Point Result
pin4 To pin5 0 V or 5 V
No
Hinge
RD(Rx)
4 4
BN(Tx)
3 3
BO(GND)
2 2
2
WH/BK(12V)
1 1
1
Wiring diagram
Yes
Reconnect
Replace the
Display PCB
YES
(Position No:
501A)
- 31 -
RD(Tx)
4
3
BN(Rx)
DISPLAY
3
4
BO(GND)
5
WH/BK(12V)
6
Display PCB
Is the voltage between
pin3 and pin5 of CON101
0 V or 5 V?
Pin5 BO
Pin3 RD
Transmitter Voltages
Test Point Result
Pin3 To 0 V or 5 V
pin5
No
Is the joint connection
loose In the Hinge?
Yes
CON101
PCB
* Rx: Receiver
Tx: Transmitter
Replace
Yes
Display PCB
Reconnect
No