Communication Error After Completion Of Tracking - Samsung JH035EAV Series Service Manual

4-3-4 Communication error after completion of tracking

Indoor unit display
Criteria
Cause of problem
indoor unit after checking out the communica-
After removing the communication line
that links outdoor to indoor units measure
2 lines of the outdoor unit with scope.
At this time, the voltage between
lines is a square wave that is above DC±0.7V as
shown in the picture below
After reconnecting the communication
line that links outdoor and indoor units,
remove communication connector in the
indoor PCB. If communication does not
work during operation, replace PCB of
+0.7V
-0.7V
Samsung Electronics
(Operation)
If communication between indoor and outdoor units has been blocked for 2 minutes during operation
Communication error between indoor and outdoor unit
Replace PCB of
tion line
Yes
the indoor unit.
Good
Defrost) (Reservation) X(Fan)
No
Operating Instructions and Installation
X(MPI)
Replace PCB after checking the
communication line of the outdoor unit
PCB and connector
defect
Troubleshooting
4-15