Samsung AM160FNBFEB/EU, Training Manual For Installation, Service

Page: 64 / 74

9. Troubleshooting 9. Troubleshooting
Communication Error between Indoor
and Outdoor Units after Tracking
■ E202
No
Press the reset key (K3) of the outdoor unit
PCB and check the display module.
and Outdoor Units after Tracking
Is there no indoor unit response
at all from the display module
during the tracking?
Yes
No
After two minutes, find the indoor unit which displays
the communication error and check if the PCB address
settings are overlapped. (Communication error occurs
Remove the communication cable that connects
the outdoor unit to the indoor nit, and measure
the 2 outdoor unit cables with a oscilloscope.
if the indoor unit addresses are overlapped.)
-In this case, the communication error will occur in
every indoor unit (2 or more units) with the address
incorrectly set.
If there is no abnormality in the address, check
Is the voltage between the
2 cables a square wave with DC
±
0.7V or more
as shown in the image below?
No
y ,
the communication cable and change the
indoor unit PCB.
Check the communication cable and the
Connect the communication cable again to connect
the outdoor unit to the indoor unit. Remove all the
communication connectors on the PCB of the indoor
it d t th b t fi d th i d
Yes
Check the communication cable and the
connector for the outdoor unit PCB, and
change the PCB.
unit, and connect them one by one to find the indoor
unit which interferes with the communication to check
and change the indoor unit PCB.