SERVICE MANUAL MR-G57N-T-NZ - B.d.t.

Poor defrosting
[4]
The refrigerator fan motor does not work
[5]
1 Short-circuit the terminal and of the compulsory
defrosting terminals (CN1M) of the control board to actuate
the compulsory defrosting function and check whether the
defrost heater is working properly. *1
2 Check if there is conduction between thermal fuse
and defrost heater.
1
Control board
CN7S
CN2A
Doors
3-Pin connector
Between
1 and 3
No
Yes
No
4-pin connector
1-pin connector
2 Unplug and plug the power cord to check if
machine chamber fan motor is rotating.
3
5
2-pin connector
31
Poor cooling
No
Room light is turned on and off properly.
Any one of the doors
are open
OFF
etc
2 -pin connector
Yes (heats up)
Thermal fuse
Defrost heater
Defrost thermistor
Room light
is not turned
on and off.
Door switch for refrigerator compartment (right and left) and ice making compartment.
Control board
Unplug and plug the power cord to perform self-check on
refrigerator fan motor. Is the display indicating abnormality?
Running
Check the door switch for conduction.
•Open and close the refrigerator door 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 .)
•Close the refrigerator compartment door until the light is
turned off . Open and close the ice-making-compartment
door , and from the space of refrigerator compartment
door, check that the room light is turned on and off.
Check if there is continuity in 4-pin fan motor connector in
versa compartment.
CN7S
CN4D
8-pin
connector
4-pin
connector
R-door (right, left): closed
Door of the ice making
compartment : closed
1 2
ON
Reed Switch board
3-pin connector
2-pin
connector
4-pin connector
Yes
Not rotating
Conduction detected
No conduction
Refrigerator compartment
(right and left)/ Ice making
compartment door switch
Freezer compartment
door switch
Refrigerator
fan motor
4 Check the conduction by
disconnecting the CN7S
on the control board. (See
figure below.)
Check the following and explain the
result: 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.
Normal
Short circuit
CN1M
Compulsory defrosting
*1 The compulsory defrosting will
not work when the temperature
of the defrost thermistor is 14°C
or more.
Replace refrigerator fan motor.
Note: Refrigerator fan motor is combined
with fan grille.
Check if CN4D connector on control
board is connected properly.
If it is, replace the control board.
Abnormal
Contact failure of
connector.
Connect it properly.
Check if the connector on
the door switch is connected
properly. If it is, replace
the door switch.
Connect the connectors properly.
Replace refrigerator fan motor.
Note: Refrigerator fan motor is combined
with fan grille.
If any one of those doors are open, the switch between
and , terminals of 3-pin connector, will be OFF)
5~10mm
Left door of refrigerator
comparttment
Door of ice
making
compartment
1
Right door of refrigerator
compartment
Door of
versa
compartment
Door of vegetable
compartment
Door of freezer
compartment