Communication Error After Completion Of Tracking - Samsung AC026MNJDKH/EU Service Manual

4-3-4 Communication error after completion of tracking

Indoor unit display
Criteria
Cause of problem
PCB of indoor unit after checking out
the communication line
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
4-18
X(Operation) X(Defrost)
If communication between indoor and outdoor units has been blocked for 2 minutes during operation
Communication error between indoor and outdoor unit
Replace
Yes
the indoor unit.
Good
(Reservation) (Fan) X(VIRUS DOCTOR)
No
Replace PCB after checking the
communication line of the outdoor unit
PCB and connector
defect
Samsung Electronics