Mitsubishi Electric MSZ-AP15VG-E1 Service Manual page 29

B Check of remote controller and indoor electronic control P.C. board
*Check if the remote controller is exclusive for this air conditioner.
Press OFF/ON(stop/operate) button on the
remote controller.
Is LCD display on the remote controller
visible?
Yes
Remove the batteries, then put them back
and press RESET button. (Refer to 10-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
Yes
OK
Measure the voltage between receiver P.C. board connector CN301 No.2(+) and No.3(-) when the remote
controller button is pressed.
Is the voltage approximately 4 V DC - 5 V DC?
Replace the receiver P.C board .
OBH838B
Replace the batteries. (Refer to 10-1.4.)
No
(Not clear)
Turn ON a radio to AM and press OFF/
ON(stop/operate) button on the remote con-
No
troller. *1
Is noise heard from radio?
Yes
Is a signal transmitted from a remote
controller of a different device?
No
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 1 m.?
*2
No
Yes
No
29
*1
Look at the image of the signal transmitting section of the
remote controller through the monitor of a digital camera
or a camera phone. It is normal if the LED of the signal
transmitting section lights up when the OFF/ON(stop/oper-
ate) button on the remote controller is pressed. However,
it may be difficult to see the illuminated LED of the signal
transmitting section with a smartphone camera.
*2
If the inverter fluorescent light is turned on when the room
is cool, the unit may have difficulty receiving the signal
from the remote controller or may not be able to operate
with it; if the inverter fluorescent light is turned on when
the room is warm, the unit may be able to operate with the
remote controller.
Replace the remote controller.
No
Stop the transmission of signal
between the different device and its
Yes
remote controller.
• Reinstall the unit away from lights.
• Attach a filter on receiving part.
Yes
Replace the indoor electronic control P.C.
board.