Mitsubishi MJ-EZ6CX-S1-IT Service Manual page 18

Does the blower fan motor
rotate?
YES
Stepping motor (louvre)
does not operate.
YES
Does it dehumidify?
YES
18
Check the float switch.
Check if there is no disconnection or
●
contact failure of the connector ( P12 ) and
connector pins of operation control board.
Check the continuity between connecter ( P12 )
●
terminals when the water tank is equipped.
Normal ... Tank full : open
Empty:short
OK
Check if there is no disconnection or
NO
contact failure of the connector ( P6 ) and
connector pins of power control board.
OK
Check the resistance of the blower fan
motor.
Normal : Between pin1 and pin5 430-490
Abnormal:Between pin1 and pin5 open or short
NO
Is the swing louvre switch "OFF"?
NO
Check if there is no disconnection or
contact failure of the connector ( P8 ) and
connector pins of power control board.
OK
Check the resistance between connector
pins of the stepping motor.
Normal : Terminal 1-2
Terminal 1-3
Terminal 1-4 342-418
Terminal 1-5
Abnormal:Each interval is open or short
OK
Is there any clog or dust on the
NO
filter?
NO
Does the zeolite rotate?
YES
NG
Replace the float sensor.
NG
Replace the operation control board.
NG
Replace the power control board.
NG
Insert the connector and
connector pin securely.
OK
NG Replace the blower fan motor.
NG
Replace the power control board.
OK
Does the swing direction of
YES
the louvre change to"wide",
"front",or "upward"?
NO
Insert the connector and connector
NG
pin securely if there are any defects.
OK
NG
Replace the stepping motor.
OK
YES
Clean the filter.
OK
NO
Are any foreign objects caught
in the gear ring?
YES
YES
Does the rotor motor rotate?
NO
Check if there is no disconnection or
contact failure of the connector ( P7 ) and
connector pin of power control board.
OK
Check the continuity of the rotor motor.
Normal:Between the pin1and pin3
2-4 kΩ
Abnormal:Between pin1and pin3
Open or short
OK
Check if there is no disconnection or
contact failure of the connector ( P14 )
and connector pins of the photo
interrupter and power control board.
NO
OK
Insert the connector and
connector pin securely.
OK
OK
OK
OK
YES
Normal
NG
Replace the power control board.
OK
NO Remove the foreign object
from the gear ring.
OK
Insert the connector and
NO
connector pin securely.
OK
NO Replace the rotor motor.
NG
OK
Replace the power control board.
OK