Troubleshooting By Symptoms; Communication Error After Finishing Tracking (E202) - Samsung AF55JV1MAEE Service Manual

4-3 Troubleshooting by symptoms

4-3-1 Communication error after finishing tracking (E202)

1. Check items
1) Is the communication cable short/open?
2) Is there a response from the indoor unit PCB?
2. Check procedure
Is there a response from the indoor unit PCB?
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
In this case, is the
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 unit
and restart the unit.
If the communication still doesn't work,
e r l p c a t e e h
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
Yes
indoor unit PCB and
Good
No
Check the communication cable and
replace the indoor unit PCB?
No
Connect the power/communication
cable correctly.
No
Check the communication
cable in each PCB
and replace the PCB
Bad
Troubleshooting
4-5