Mitsubishi Electric MR-CU375S-W-A, MR-CU375S-W-ANZ, MR-CU375S-ST-ANZ, MR-CU375S-ST-A, MR-CU375SL-W-A Service Manual

Changes for the Better

Models

CONTENTS

A………….......Australia

A(NZ)...............New Zealand

1. SPECIFICATIONS....................................................

2. OUTLINES AND DIMENSIONS..................................

3. WIRING DIAGRAM....................................................

4. REFRIGERANT CIRCUIT...........................................

5. NAMES OF THE PARTS...........................................

6. TROUBLE SHOOTING..............................................

6.1 TROUBLE CRITERION OF MAIN PARTS.......

6.2 FUNCTION OF OPERATION PANEL..............

6.3 FLOW CHART OF SELF-CHECK....................

6.4 TEST POINT DIAGRAM OF MAIN CONTROL

BOARD........................................................

7. DISASSEMBLY INSTRUCTIONS...............................

8. PARTS LIST............................................................

1
3
4
6
7
8
8
11
12

15
16
21

MR-CU375S-W-A
MR-CU375S-ST-A
MR-CU375S-W-A(NZ)
MR-CU375S-ST-A(NZ)
MR-CU375SL-W-A
MR-CU375SL-ST-A
MR-CU375SL-W-A(NZ)
MR-CU375SL-ST-A(NZ)

2006

SERVICE MANUAL

NO.SM-RE-0605

MITSUBISHI
ELECTRIC

HOME REFRIGERATORS

1-1 SPECIFICATIONS
MR-CU375S/SL-A

MR-CU375S/SL-A(NZ)

Power supply

Total capacity L

Dimensions (HXWXD) mm. 1655 x 600 x 639

Cabinet Acrylic resin coated steel

Food liner ABS resin

Cabinet Foamed cyclopenthane

Refrigerator door Foamed cyclopenthane

Vegetable door Foamed cyclopenthane

Freezer door Foamed cyclopenthane

Cooling system

Freezer Forced air convection

Refrigerator 3 way air flow

Evaporator Fin and tube type

Condenser Concealed type

Defrost system Automatic (Defrost heater )

Drain Automatic (drainage)

Temperature control system Automatic control

Refrigerator room light 240V, 15W (E12)

Ice spoon 1 pc.

Slide chilled case (UP) 1 pc.

Slide chilled case (LR) 1 pc.

Freezing case (UP)

1 pc.

Freezing case (LOW)

1 pc.

Crystal shelf (R)

1 pc.

Top plate

1 pc.

Slide shelf

1 pc.

Free pocket (M) 2 pcs.

Tube stand 1 pc.

Egg case 1 pc.

Bottle pocket 1 pc.

Vegetable case 1 pc.

Vegetable case cover

1 pc.

Drain pan 1 pc.

Fruit case 1 pc.

Water tank 1 pc.

Kick plate 1 pc.

Weight

Unit kg 69

Shipping kg 76

1 SPECIFICATIONS

- 1 -

Insulation

Accessories

GROSS (AS) 376 (R : 198 V : 111 F : 67)

230-240V 50Hz

1-2 ELECTRICAL PARTS SPECIFICATION
MR-CU375S/SL-A

MR-CU375S/SL-A(NZ)

Model ESS60C11RAW
Power supply 220-240V, 50Hz

Compresso

r

Rated input W 116/118 (220/240V 50Hz)
Starting current A 8.49/9.31 (220/240V 50Hz)
Running current A 0.57/0.55 (220/240V 50Hz)

Winding resistance (A.T. 20

o

C)

17.9

Ω(Main) / 15.1 Ω(Aux)

PTC RELAY PTH7M330MD2

Model 5TM222NHBYY-53

Motor protecto

r

Ambient temperature

o

C

25
Time Sec. 16 MAX
Current A 6.7

Running capacito

r

4µF 400VAC

Capillary tube mm.

∅ 1.8 X ∅ 0.65 X 2350

Dehydrant Molecular sieve g 10
Refrigerant HFC. 134a g 220
Compressor oil g

Defrosting timer Control board
Defrost finish

o

C

Thermister 14 +

1.5

Thermal fuse

o

C

73
Defrost heater

Not equipped
Model UDQM002B3
Type DC brushless
Number of poles 10P
Input W 2.4 (12V DC)
Revolution r.p.m 1520(12V DC)
Model UDQM004B3
Type DC brushless
Number of poles 10P
Input W 1 (12V DC)
Revolution r.p.m 1200(12V DC)
Vegetable case heate

r

W6

Water pipe heate

r

W0.9

Drain pipe heate

r

W6

Freeze

r

Refrigerato

r

Dial position ON OFF OPEN SHUT
LOW

o

C

-16.0 -21.9 7.0 5.8

MID

o

C

-18.4 -24.3 5.1 3.8

HI

o

C

-21.1 -27.1 3.2 1.9

186 (FREOL ∝ 10)

Refrigerator

384 Ω (240V, 150W)

- 2 -

Defrosting control

Deodorizing function of defrost heater

Thermistor RThermistor F

Fan motor

Heater

Machine
Chamber

Temperature control

MR-CU375S/SL-A

Unit : mm

MR-CU375S/SL-A(NZ)

- 3 -

2 OUTLINES AND DIMENSIONS

MR-CU375S/SL-A

(SKELETON WIRING DIAGRAM)

MR-CU375S/SL-A(NZ)

3 WIRING DIAGRAM

- 4 -

(ACTUAL WIRING DIAGRAM)

Remark GY = GRAY BK = BLACK BR = BROWN

W = WHITE OR = ORANGE

R = RED Y = YELLOW

SB = SKY BLUE YG = YELLOW GREEN

P = PINK LG = LIGHT GREEN

LB = LIGHT BROWN BY = BRIGHT YELLOW

V = VIOLET B = BLUE

- 5 -

THERMALFUSE（73°

7 6 5 4 3 2 1

LL

BUZZER&
THERMISTORA.T

REFRIGERATORROOM

9
8
7
6
5
4
3
2
1

R
Y

SB

GY
BY
BK

8
7
6
5
4
3
2
1

R
Y
SB
GY
BY
BK

W

W

R

Y
SB
GY
BY
BK

OR

SB

THERMISTORR

MOTORDAMPER

MD

1
2
3
4

1
2
3
4

R

Y

B

BR

1
2
3
4
5
6

R

Y

B

BR

R

Y

B

BR

FM

FANMOTOR

BK

V
LB
BY

1
2
3
4

BK

V
LB
BY

BK

V
LB
BY

ROOMLIGHT

1
2

YORY

GY

2
1

GY

W

GY

W

4
3
2
1

1
2

LB
LB

LB

LB

LB

LB
R
B

YG

P

M

WATERPUMP

DOORSW.R

C）
VEGETABLE
ROOM

DEF.THERMISTOR

DEF.HEATER

1
2

1

W
W

W

W

P

SB

R

WATERPIPEHEATER

1
2

1
2

1
2
3
4
5
6
7
8
9
10

1
2

LB
LB

LB
LB

LB

R

GY

R

GY

YG

SBBK

BK

SB

SB

SB

SB

SB

SB

SB

B

B

LG

LG
GY

GY

W

W

P

P

VHEATER

DOORSW.F

FREEZER
ROOM

THERMISTORF

THERMISTORI

GEARBOX

6 5 4 3 2 12 1

DRAIN
HEATER

WW

B

SB

W

GYGY

W

PTC
THERMISTOR

OUTER
FANMOTOR

1 2 3 4

Y

GY

GY

Y

MOTORPROTECTOR

FM

V

BK

OR

LG

4
3
2
1

CN10

12
11
10
9
8
7
6
5
4
3
2
1

V

BK

GY

B

BY

BR

LB

Y

P

R

W

YG

CN4

11
9
7
5
3
1

YG

SB

Y

7
5
3
1

R
W

GY

18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

SB

LB

P

LG

OR

SB

B

Y

R

BY

GY

BK

V

GY

R

W

5
4
3
2
1

3 1

B

BR

CN3

CN2

CN7

CN9

CN1

R

W

V

GY

SB

TEMPCONTROL

W
V

W
V

W

REFRIGERATORDOOR

LG

OR

BK

V

1

2

GY

GY

W

W

2

1

R

DIODE

W

CONTROLBOARD

VEGETABLEDOOR

FREEZERDOOR

W

R

P

SB

YB

W

W

SBLGGY

MR-CU375S/SL-A
MR-CU375S/SL-A(NZ)

MR-CU375S/SL-A
MR-CU375S/SL-A(NZ)

- 6 -

4 REFRIGERANT CIRCUIT

MR-CU375S/SL-A
MR-CU375S/SL-A(NZ)

- 7 -

5 NAMES OF PARTS

Fruit case

Vegetable case

Water tank

Ice box sheet

Ice spoon

Freezing case (UP)

Freezing case (LOW)

Vegetable case room

Auto ice making

Freezer room

Free pocket (M)

Egg case

Tube stand

Bottle pocket

Crystal shelf (R)

Slide shelf

Thermo dial (R)

Slide Chilled case (UP)

Slide chilled case (LOW)

Top plate

Kick plate

Drain pan

6.1 TROUBLE CRITERION OF MAIN PARTS
MR-CU375S/SL-A

MR-CU375S/SL-A(NZ)

Compressor

Measure the resistance with a tester.
(Ambient temperature:Room temperature 15

o

C ~ 25oC)

Measure the resistance with a teste

r

Open
Close

Opened (∞ Ω )

PTC Relay

PTH7M330MD2

Measure the resistance with a tester.
(Ambient temperature:Room temperature 15

o

C ~ 25oC)

Normal

As PTC Relay has been heated while refrigerator is running be sure
to measure the resistance after the thermistor has got cool enough.

33 Ω (Approx.)

Abnormal(faulty)

Opened (∞ Ω ) or Short (0Ω)

Rated input W 116/118 (220/240V 50Hz)

Short (0Ω )

15.1 Ω (Approx.)

Normal

Main wiring

A

Starting current

chamber at the
rear side of

0.57/0.55 (220/240V 50Hz)

A 8.49/9.31 (220/240V 50Hz)

Running current

Measure the resistance with a tester.(Ambient
temperature:Room temperature 15

o

C ~ 25oC)

69 + 9o C

Abnormal

(faulty)

5TM222NHBYY-53

Opened

(∞ Ω )

or

Short (0Ω)

120 +

5o C

Connected

Point

Normal

17.9 Ω (Approx.)

Auxilliary wiring

Run capacitor

4 µF

Rated input

Motor

protector

400VAC

Abnormal(faulty)

Model

the frame

the frame

In the control
panel of the
rear side at
compressor
room

Compressor in
the machine
chamber at the
rear side of
the frame

- 8 -

Model

Normal

Abnormal(faulty)

Less than 1Ω

rear side of

chamber at the

the machine

Compressor in

6

Components
/ Part Name

TROUBLE SHOOTING

Model

Parts

Mounted

Position

Check Method and Criterion

ESS60C11RAW (220-240V 50Hz)

Compressor in
the machine

Auxilialy
wiring

Main
wiring

5

6

3

2

5

6

2

3

1

3

Therminal check point

Measure the resistance with a tester.(Ambient temperature: Room temperature 15oC ~ 25oC)

Measure the resistance with a tester.(Ambient temperature: Room temperature 15

o

C ~ 25oC)

Measure the resistance with a tester.(Ambient temperature: Room temperature 15

o

C ~ 25oC)

Normal

Abnormal (faulty)

Measure the resistance with a tester.(Ambient temperature: Room temperature 15oC ~ 25oC)

Number of pole

DC brushless

Diameter

∅ 140 (Diagonal fan)

In the machine
chanber at the rear
side of the frame.

UDQM004B3

Model

Number of pole

DC brushless

Diameter

∅ 140 (Diagonal fan)

Open (∞Ω) or

short circuit (0Ω)

Motor
damper for
refrigerator
compartment
slide
compartment

In the fan grille of
the refrigerator
compartment.

Normal

415 Ω

(Approx.)

Model

Normal

Between 1 - 4 (GND
and IC Power ) :
About 12k Ω

- 9 -

Under the water
tank holder in
refrigerator
compartment.

Open (∞ Ω )

or short

circuit (0Ω)

Abnormal

(faulty)

Winding
(Blue-White,
Red-Yellow)

Water
pump motor
(DC 5V)

16 Ω (Approx.)

In the fan grille of
the refrigerator
compartment.

Refrigerator
fan motor

UDQM002B3

Machine
chamber
fan motor

Normal

Abnormal (faulty)

B

etween 1 - 4
(GND and IC
Power ) : About

9

k Ω

Between 1-4 : open( ∞

Ω ) or

between 3-4 : short ( 0 Ω)

Abnormal (faulty)

Between 1-4 : open( ∞

Ω ) or

between 3-4 : short ( 0 Ω)

Check Method and Criterion

Parts Mounted Position

Components/

Part Name

IC power
Power

GND

FG

IC

Pin no.

1
2
3

4

123

4

IC power
Power

GND

FG

IC

Pin no.

1
2
3

4

123

4

Yellow

Red

Blue Brown