Mitsubishi Electric MSZ-SF15VA-E1 Service Manual page 25

B Check of remote controller and indoor electronic control P.C. board
Check if the remote controller is exclusive for this air conditioner.
Press STOP/OPERATE (MSZ-SF·VA-
)/OPERATE/STOP (Other models) but-
ER4
ton 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 VDC - 5 VDC?
OBH555D
,
E4
Replace the batteries. (Refer to 10-1.4.)
No
(Not clear)
Turn ON a radio to AM and press STOP/OP-
ERATE (MSZ-SF·VA-
No STOP (Other models) button on the remote
controller.
Is noise heard from radio?
Is a signal transmitted from a remote
controller of a different device?
Are there any f uorescent lights of
inverter or rapid-start type within the
range of 1 m.?
No
Replace the receiver P.C board .
1
2
, )/OPERATE/
E4 ER4
1
No
Yes
Yes
No
Yes
2
No
Yes
Replace the indoor electronic control P.C.
board.
25
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 trans-
mitting section lights up when the STOP/OPERATE (MSZ-
SF·VA- , )/OPERATE/STOP (Other models) button
E4 ER4
on the remote controller is pressed. However, it may be
diff cult to see the illuminated LED of the signal transmitting
section with a smartphone camera.
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.
Stop the transmission of signal between
the different device and its remote control-
ler.
• Reinstall the unit away from lights.
• Attach a f lter on receiving part.