Mitsubishi Electric MUFZ-KJ-NAHZ Series, Руководство по обслуживанию

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Check of remote controller, display receiver P.C. board and indoor control P.C. board
B
Check if the remote controller is exclusive for this air conditioner.
Does the unit operate with the
remote controller?
OK
Yes
No
(Not clear)
Replace the batteries. (Refer to 9-1.4.)
Press STOP/OPERATE (OFF/ON)
button on the remote controller.
Is LCD display on the remote
controller visible?
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.
Yes
No
Turn ON a radio to AM and press
STOP/OPERATE (OFF/ON) button
on the remote controller. 1
Is noise heard from radio?
Yes
No
Replace the remote controller.
Are there any À uorescent lights of
inverter or rapid-start type within
the range of 3.28 ft. (1 m)? 2
Yes
No
• Reinstall the unit away from lights.
• Attach a
¿ lter on receiving part.
Replace the display receiver P.C. board.
Assign a number of remote controller.
(Refer to 7-2.)
Check if the unit operates with the
remote controller.
Does the unit operate with
the remote controller ?
Yes
No
OK
Measure the voltage between display receiver P.C. board connector CN301 (+) and (-)
when the remote controller button is pressed.
Is the voltage approximately 4 VDC - 5 VDC?
No
Yes
Replace the indoor electronic
control 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 STOP/
OPERATE (OFF/ON) button on the remote control-
ler is pressed. However, it may be dif
¿ cult to see the
illuminated LED of the signal transmitting section with a
smartphone camera.
2 If the inverter
À uorescent light is turned on when the
room is cool, the unit may have dif ¿ culty receiving the
signal from the remote controller or may not be able to
operate with it; if the inverter
À uorescent light is turned
on when the room is warm, the unit may be able to
operate with the remote controller.
2%+%