Check Of Remote Controller And Indoor Electronic Control P.c. Board - Mitsubishi Electric MSZ-GE09NA Service Manual

B Check of remote controller and indoor electronic control P.C. board
Check if the remote controller is exclusive for this air conditioner.
MSZ-GE06/09/12/15/18NA
MSY-GE09/12/15/18NA
Press OPERATE/STOP (ON/OFF)
button on the remote controller.
Is LCD display on the remote controller
visible?
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 9-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
Yes
OK
MSZ-GE24NA MSY-GE24NA
Press OPERATE/STOP (ON/OFF)
button on the remote controller.
Is LCD display on the remote controller
visible?
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 9-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
Yes
OK
OBH548D
Replace the batteries. (Refer to 9-1.4.)
No
(Not clear)
Turn ON a radio to AM and press OP-
ERATE/STOP (ON/OFF) button on the
No
remote controller. 1
Is noise heard from radio?
Yes
Are there any fl uorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.(1m)?
No
Replace the indoor electronic control
P.C. board. (Including the receiver)
Replace the batteries. (Refer to 9-1.4.)
No
(Not clear)
Turn ON a radio to AM and press OP-
ERATE/STOP (ON/OFF) button on the
No
remote controller. 1
Is noise heard from radio?
Yes
Are there any fl uorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.(1m)?
No
Measure the voltage between power moni-
tor receiver SW P.C. board connector CN20A
No.2(+) and No.3(-) when the remote controller
button is pressed. (Refer to 9-7.3.)
Is the voltage approximately 4 VDC?
No
Replace power monitor receiver SW P.C. board.
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 OP-
ERATE/STOP (ON/OFF) button on the remote control-
ler is pressed. However, it may be diffi cult to see the
illuminated LED of the signal transmitting section with a
smartphone camera.
2 If the inverter fl uorescent light is turned on when the
room is cool, the unit may have diffi culty receiving the
signal from the remote controller or may not be able to
operate with it; if the inverter fl uorescent light is turned
on when the room is warm, the unit may be able to
operate with the remote controller.
No
Yes
2
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 OP-
ERATE/STOP (ON/OFF) button on the remote control-
ler is pressed. However, it may be diffi cult to see the
illuminated LED of the signal transmitting section with a
smartphone camera.
2 If the inverter fl uorescent light is turned on when the
room is cool, the unit may have diffi culty receiving the
signal from the remote controller or may not be able to
operate with it; if the inverter fl uorescent light is turned
on when the room is warm, the unit may be able to
operate with the remote controller.
No
Yes
2
Yes
29
Replace the remote controller.
• Reinstall the unit away from lights.
• Attach a fi lter on receiving part.
Replace the remote controller.
• Reinstall the unit away from lights.
• Attach a fi lter on receiving part.
Replace indoor electronic control P.C.
board.