Mitsubishi Electric MR-CU375S-W-A Service Manual page 14

(3) LED trouble display and the check point
(3.1) LED trouble display : follow the procedure of "self check method
and its operation" at page 11. Trouble is indicated by the blinking number
of ice making stop LED.
∗
When several troubles occur, smaller blinking number of LEDs has to be indicated first.
(3.2) Check point and treatment
Function
Normal
Off
1. Normally display and the Auto ice-maker
system display.
* If non-power supply, it'll show as same
the effect.
Auto ice maker NG
Blink
1. The connector lead wire of Auto ice maker 1. Check all points of the Auto ice maker
0.1 second
is not orderly.
2. Auto ice maker (Motor's not rotate
and non-display)
3. PCB plate ( Ref Con assy) NG
Thermistor(I) NG
Blink
1.
The connector thermistor (I) lead wire
0.3 seconds
isn't orderly.
2. Thermistor (I) NG (break or short)
3.
PCB plate (Ref Con assay) NG
Thermistor (F) NG
1 Blink
1. The connector thermistor (F) lead wire
isn't orderly.
2. Thermistor (F) NG (break or short)
3. PCB plate (Ref Con assy) NG
Thermistor (DEF) NG
2 Blinks
1. The connector DEF. thermistor lead wire 1.
isn't orderly.
2. Thermistor (DEF) NG (break or short)
3. PCB plate (Ref Con assy) NG
Defrost heater NG
3 Blinks The Defrost heater connector lead wire
1.
isn't orderly.
2. Defrost heater break or
Thermal fuse break.
3. PCB plate (Ref Con assy) break.
Explanation Detecting method and corrective NG points
2.
3.
1.
2.
3.
1.
2.
3.
2.
3.
1.
2.
3.
Refrigerator room
Slide room
NO
connector lead wire. May be un-lock
and struck insert.
Replace and re-check the Auto ice
maker.
Replace and re-check the PCB plate
( Ref Con assy)
Check all points of the thermistor (I)
connector lead wire, may be unlock
and struck insert.
If the resistance of thermistor (I) is NG,
should be changed the thermistor and
re-check the resistance.
If the resistance is OK,should be changed
PCB plate (Ref Con assy and re-check
the resistance).
Check all points of the thermistor (F)
connector lead wire, may be unlock
and struck insert.
If the resistance of thermistor (F) is
NG,should be changed the thermistor and
re-check the resistance.
If the resistance is OK,should be changed
PCB plate (Ref Con assy and re-check
the resistance.
Check all points of the thermistor
(DEF) connector lead wires, may be
unlock and struck insert.
If the resistance of thermistor (DEF) is
NG,should be changed the thermistor and
re-check the resistance.
If the resistance is OK,should be changed
PCB plate (Ref Con assy and re-check
the resistance.
Check all points of the defrost heater
connector lead wire, may be un-lock
and struck insert.
Check the resistance of the defrost heater
and thermal fuse.
If the resistance is OK,should be changed
PCB plate (Ref Con assy and re-check
the resistance.
-13 -
Ice making
stop LED Refrigerator Freezer
Ice maker off
Display function of LED
Light
No Light
0.1 sec
0.1 sec
Light
No Light
0.3 sec 0.3 sec
Light
No Light
0.3 sec 5 sec
Light
1
1
No Light
1 Cycle
0.3 sec
5 sec
Light
1 2 1 2
No Light
1 Cycle
1 Cycle
Light
1 2 3 1
No Light
0.3 sec 5 sec