MITSUBISHI ELECTRIC Mitsubishi Home Refrigerator MR-G50J-SS-NZ - Manual (Page 23)

23
Plug and unplug the power cord to perform self-check on
refrigerator fan motor. Is the lamp indicating abnormality?
Contact failure of
connector.
Connect it proper-
ly.
Poor cooling
Poor defrosting
[4]
The refrigerator fan motor does not work
[5]
No
No
Yes
Yes (heats up)
Check the following: half-open door,
space between gaskets, the amount
of ice.
Replace the defrost heater and the
thermal fuse.
Check the resistance of the defrost
thermistor.
*1 The compulsory defrosting will
not work when the temperature
of the defrost thermistor is 14
:
or more.
Control board
CN7S
CN2A
2-pin connector
4-pin connector
9-pin connector
1-pin connector
Thermal fuse
Defrost heater
Defrost thermistor
3
5
3
4
5
2
3 3
1 1
1
2
2
4
2
1
9
4
9
4
Check if the connector on
the door switch is connect-
ed properly. If it is, replace
the door switch.
Abnormal
Normal
Room light is
not turned on
and off.
Room light is turned on and off properly.
OFF
etc
ON
R-door (right, left): closed
Door of the ice making
compartment : closed
Any one of the doors
are open Doors
2-Pin connector
Between
and 1 2
1 2
10~50mm
a
Door of vegetable
compartment
Door of freezer
compartment
Left door of refrigerator
comparttment Door of ice
making
compartment
Door of
versa
compartment
Right door of refrigerator
compartment
c
b
Door switch for refrigerator compartment (right and left) and ice making compartment.
No
Not rotating
Yes
Replace refrigerator fan motor.
Check if CN4D connector on control
board is connected properly.
If it is, replace the control board.
Running
No continuity
Connect the connectors properly.
Continuity detected
Replace refrigerator fan motor.
Control board
CN7S
CN4D
8-pin
connector 2-pin
connector Refrigerator compartment
(right and left)/ Ice making
compartment door switch
Lead Switch board
Refrigerator
fan motor
6-pin
connector 4-pin
connector
M
6
8
5
3
6
8
5
3
1
2
4
3
1
2
4
3
4
3
2
1
4
3
2
1
8
7 4
3 4
3 8
7 2
1
2
1
2 Plug and unplug the power cord to check if
machine chamber fan motor is rotating.
5 Check if there is continuity in 6-pin fan motor connector in
versa compartment.
3 Check the door switch for continuity.
•Open and close the refrigerator door
b several times
and check if the room light will be turned on and off
(Room light should get turned off when the door comes
10mm close to the refrigerator body
a .)
•Close the refrigerator compartment door until the light is
turned off a . Open and close the ice-making-compart-
ment door c , and from the space of refrigerator compat-
ment door, check that the room light is turned on and off.
2 Check if there is continuity between thermal fuse
and defrost heater.
4 Check the continuity by
disconnecting the CN7S
on the control board.
(See figure below.)
1
Compulsory defrosting
Short circuit
CN1
Note: Refrigerator fan motor is combined
with fan grille.
Note: Refrigerator fan motor is combined
with fan grille.
w If any one of those doors are open, the switch between
1 and 2 ,terminals of 2-pin connector, will be OFF)
1 Short-circuit the terminal ➀ and ➁ of the compulsory
defrosting terminals (CN1M) of the filter board to actuate
the compulsory defrosting function and check whether the
defrost heater is working properly.
*1
1
OA090-1.qxp 06.7.20 9:55 AM Page 23