Poor cooling

[4] Poor defrosting

1Short-circuit the terminal and 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

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Image 23
Mitsubishi Electronics MR-G50J-SS-NZ manual Poor defrosting, Motor does not work, Refrigerator fan