Communication Error After Finishing Tracking (E202) - Samsung AC071MN4PKH Service Manual

4-4-5. Communication error after finishing Tracking (E202)

Indoor unit display
Judgment method
Symptom
Is there a response from the indoor PCB?
(LED01 (RED) is not ON)
Remove the communication cable
connecting the outdoor unit to indoor unit,
and measure the signal on LINE 2 of the
outdoor unit with a scope
voltage waveform between the lines square
wave with amplitude over ±0.7V as shown in
the following picture?
Reconnect the cable connecting the outdoor unit
to the indoor unitand restart the unit.
If the communication still doesn't work,
replace the indoor unit PCB.
+0.7V
-0.7V
360 Cassette
Refer to checking method, as shown below
If the communication error between the indoor and outdoor unit for two minutes.
Yes
In this case, is the
Yes
x(Ice blue) ◑(Yellow green) x(Blue) x(Red)
No
Check the communication cable and
replace the indoor unit PCB
No
cable in the outdoor unit PCB
4-29
Troubleshooting
Check the communication
and replace the PCB