Communication Error After Finishing Tracking (E202) - Samsung AC009BNLDCH Service Manual

4-4-6. Communication error after finishing Tracking (E202)

Outdoor Unit display
Wired remote Control, Wind Free RAC
Duct, 1way Cassette
Display
Duct
Blue Red
1way
Blue Yellow
X X
Judgment
Refer to checking method, as shown below
method
Symtom Communication error between the indoor and outdoor unit for two minutes
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
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,
replace the indoor unit PCB.
+0.7V
-0.7V
Samsung Electronics
E202
E202
4way Cassette,
4way Cassette(600x600)
or
or
or
◑ ◑ ◑
X X
Yes
LED01
Yes
Good
MAX4
◑ ◑ ◑
X X
No
No
Troubleshooting
Console
◑ ◑
X X X
Check the communication cable and
replace the indoor unit PCB
Check the communication
cable in the outdoor unit PCB
and replace the PCB
Bad
360 Cassette
GRN ◑
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