Mitsubishi Electronics MR-G50J-SS-NZ manual Poor defrosting, Motor does not work, Refrigerator fan

Poor cooling

[4] Poor defrosting

1Short-circuit the terminal ➀ and ➁ of the compulsory

	defrosting terminals (CN1M) of the filter board to actuate				Yes (heats up)
	the compulsory defrosting function and check whether the
	defrost heater is working properly.			*1
2			No	No
		Check if there is continuity between thermal fuse
		and defrost heater.
			Yes

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.

Control board

CN7S

99

CN2A

33

55

			4-pin￿connector￿
9-pin connector	3 3		22
			44
			Thermal fuse
1-pin connector	1 1		Defrost heater
	￿	￿
	1	1	Defrost thermistor
	2 2
2-pin connector

<Control board>

Short circuit

1

CN1

Compulsory defrosting

*1 The compulsory defrosting will not work when the temperature of the defrost thermistor is 14: or more.

motor does not work

1	Plug and unplug the power cord to perform self-check on				Yes	Replace refrigerator fan motor.
	refrigerator fan motor. Is the lamp indicating abnormality?
						Note: Refrigerator fan motor is combined
		No				with fan grille.
2	Plug and unplug the power cord to check if			Not rotating		Check if CN4D connector on control
						board is connected properly.
	machine chamber fan motor is rotating.
			Room light is			If it is, replace the control board.
		Running	not turned on
			and off.

The refrigerator fan

3 Check the door switch for continuity.	4
•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.

Check the continuity by disconnecting the CN7S

on the control board. (See figure below.)

Normal

Abnormal Contact failure of connector.

Connect it proper- ly.

Check if the connector on the door switch is connect- ed properly. If it is, replace the door switch.

[5]

Room light is turned on and off properly.

5	Check if there is continuity in 6-pin fan motor connector in	No continuity
	versa compartment.		Connect the connectors properly.

Continuity detected

Replace refrigerator fan motor.

Door switch for refrigerator compartment (right and left) and ice making compartment.

Doors	Any one of the doors	R-door (right, left): closed		Note: Refrigerator fan motor is combined
				with fan grille.
	are open	Door of the ice making
		compartment : closed
				wIf any one of those doors are open, the switch between
				1 and 2,terminals of 2-pin connector, will be OFF)
	etc	1	2
2-Pin connector
Between	OFF		ON

1and 2

board

CN7S

￿￿

33

Lead Switch board

8-pin2-pin

connectorconnector

8	￿8	￿		2	2
7	7			1	1
6-pin			4-pin
connector			connector

Refrigerator compartment (right and left)/ Ice making compartment door switch

10~50mm	b	refrigerator
	of
	door
	Right
a
	compartment
refrigerator	of
of

Control

CN4D 6￿6￿ 8￿8￿ 5￿5￿ 3￿

￿

1￿1￿	4￿4￿
2￿2￿	3￿3￿	Refrigerator
4￿4￿	2￿2￿	M fan motor
3 3	1￿1￿
	￿ ￿

door		Door
Left	ice	compartment
	of
	Door
comparttment
	making
c	compartment	vegetable
	of
	Door
	compartment
		freezer
		of
	Door
	compartment

23