Check Of Remote Controller And Receiver P.c. Board - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller.

Check of remote controller and receiver P.C. board

H
wCheck if the remote controller is exclusive for this air conditioner.
wIn case of replacing the receiver P.C. board of MSZ09UN, replace the indoor electronic control P.C. board with it because they are unified.
Switch on the remote controller.
Is LCD display on the remote con-
troller displayed?
Yes
Remove the batteries, then set them back
and press the RESET button. Check if the
unit operates with the remote controller.
Does the unit operate with the
remote controller?
Yes
OK
Connect properly.
Connect properly.
Replace the indoor electronic
control P.C. board.
No
Replace the batteries.(Refer to page 41.)
(not clear)
No
Turn on a radio to AM and press switch on
the remote controller.
Is noise heard from radio?
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 3.28ft.?
MSZ12UN
Is the connector connecting receiver
No
P.C. board and indoor electronic con-
trol P.C. board properly connected?
Replace the receiver P.C. board.
Does the unit receive signal of
No
ON/OFF with the remote controller
and emit a beep tone?
OK
No
Is auto restart assembly properly
connected ?
Replace the auto restart assembly.
Does the unit receive signal of
No
ON/OFF with the remote controller and
emit a beep tone?
OK
Does the unit receive signal of
No
ON/OFF with the remote controller
and emit a beep tone?
OK
No
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
50
Replace the remote controller.
Re-install the unit away from lights.
Attach a filter on receiving part.
MSZ09UN
Replace the power monitor, receiver
P.C. board with the indoor electronic
control P.C. board.