Troubleshooting By Symptoms - Samsung AE040RXEDEG Service Manual

4-5 Troubleshooting by symptoms

4-5-1 Communication error after finishing tracking (E202)
1. Check items
1) Is the communication cable short/open?
2) Is there a response from the Hydro unit PCB?
2. Check procedure
Is there a response from the Hydro Unit PCB?
(LED01(RED) in NOT blinking)
Is the power/communication
cable connected correctly?
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
Reconnect the cable connecting
the outdoor unit to the indoor unit
If the communication still doesn't work,
replace the comm. kit PCB and
outdoor unit PCB in order of mention.
+0.7V
-0.7V
cf.) If there is no oscillo scope, it can be replaced multimeter instead of osillo scope.
Samsung Electronics
Yes
Yes
In this case, is the
in the following picture?
Yes
and restart the unit.
Good
No
Check the communication cable and
exchange the Hydro Unit PCB
No
Connect the power/communication
cable correctly.
No
Check the communication
cable in each PCB
and replace the PCB
Bad
85