SERVICE MANUAL REF-MR-255J-A,NZ - BDT

MITSUBISHI
HOME REFRIGERATORS
SERVICE MANUAL
Models
A1……......Australia
A(NZ)1 .....New Zealand
MR-255J-W-A1
MR-255J-ST-A1
MR-255J-W-A(NZ)1
MR-255J-ST-A(NZ)1
2004
NO.SM-RE-0437
CONTENTS
1. SPECIFICATIONS.................................................... 1
2. OUTLINES AND DIMENSIONS.................................. 3
3. WIRING DIAGRAM.................................................... 4
4. REFRIGERANT CIRCUIT........................................... 5
5. NAMES OF THE PARTS........................................... 6
6. TROUBLE SHOOTING.............................................. 7
6.1 TROUBLE CRITERION OF MAIN PARTS....... 7
6.2 HOW TO CHECK P.C.BOARDS...................... 9
6.3 TEST POINT DIAGRAM OF
MAIN CONTROL BOARD.............................. 10
7. DISASSEMBLY INSTRUCTIONS............................... 11
8. PARTS LIST............................................................. 13

1 SPECIFICATION
1.1 SPECIFICATION
MR-255J-A1
MR-255J-A(NZ)1
Power supply 230/240V 50Hz
Total capacity (Gross (AS)) L 255 (F:76 R:179)
Dimensions (HXWXD) mm. 1571x555x616
Cabinet Acrylic resin coated steel
Food liner ABS resin
Cabinet Foamed cyclopenthane
Insulation Freezer door Foamed cyclopenthane
Refrigerator door Foamed cyclopenthane
Cooling system
Freezer
Refrigerator
Forced air convection
Forced air convection
Evaporator Fin and tube type
Condenser Concealed type
Defrost system Automatic (Heater defrost)
Drain Automatic (drainage)
Temperature control system Automatic control
Refrigerator room light 240V, 15W (E12)
Ice tray 1 pc.
Ice box 1 pc.
Freezer pocket 1 pc.
Slide chilled case 1 pc.
Crystal shelf ( F ) 2 pcs.
Crystal shelf ( RS ) 2 pcs.
Crystal shelf ( RL ) 2 pcs.
Accessories Free pocket 1 pc.
Egg rack (large) 1 pc.
Egg rack (small) 1 pc.
Mini pocket 2 pcs.
Bottle pocket 2 pcs.
Bottle stopper 1 pc.
Vegetable case 1 pc.
Drain pan 1 pc.
Weight
Unit
Shipping
kg
kg
49
54
- 1 -

1.2 ELECTRICAL PARTS SPECIFICATION
MR-255J-A1
MR-255J-A(NZ)1
Model
Rated input
Starting current
W
A
Running current
Winding resistance (A.T.20
A
o PTC relay
C)
Model
Ambient temperature o Time
C
Sec
Running capacitor
Current A
Capillary tube mm.
Dehydrant Molecular sieve g
Refrigerant HFC-134a
Defrosting timer
g
Defrost finish o C
Thermal fuse o Compressor
Motor protector
Defrosting control
C
Heater
Defrost heater
Deodorizing function of defrost heater
Model
Type
Fan motor Number of poles
Input W
Revolution r.p.m
Temperature
control
D57C10RAW5
220/240V 50Hz
112/116 (220/240V 50Hz)
6.92/7.5 (220/240V 50Hz)
0.76/0.72 (220/240V 50Hz)
18.1Ω(Main) / 31.7Ω(Aux)
PTH7M330MD2
MM3-17GDF
25
Below 18
5.0
4µF 400VAC
∅ 1.8 X ∅ 0.65 X 2350
10
145
Control board
Thermistor 14+1.5
73
384Ω (240V, 150W)
Equipped
MH07DX5-TJA5
Single phase
2p
Below 6.7 (220V, 50Hz)
2250+200 (220V, 50Hz)
Model
Thermistor
Dial position ON OFF
Warmer o
C -13.7 -19
Normal o
C -16.9 -22.9
Colder o
C -20.4 -27.5
- 2 -

2 OUTLINES AND DIMENTIONS
MR-255J-A1
MR-255J-A(NZ)1
426
931
170
17
57
555 (Display)
550 (Cabinet)
490 (Cabinet)
125 115
137
179
105
100
114
124
208
298
230
320
310
616 (Display)
50
1571 (Display)
52
393
915
100
- 3 -
1571
1950
470
448
486
447
616
PLUG CORD LENGTH
SPACE REQUIRED FOR INSTALLATION
52
20
555
Unit : mm
20
441
947

3 WIRING DIAGRAM
MR-255J-A1
MR-255J-A(NZ)1 (SKELETON WIRING DIAGRAM)
(ACTUAL WIRING DIAGRAM)
- 4 -

4 REFRIGERANT CIRCUIT
MR-255J-A1
MR-255J-A(NZ)1
- 5 -

5 NAMES OF THE PARTS
MR-255J-A1
MR-255J-A(NZ)1
- 6 -

6 TROUBLE SHOOTING
6.1 TROUBLE CRITERION OF MAIN PARTS
MR-255J-A1
MR-255J-A(NZ)1
Components/
Part Name
Check Methode and Criterion
Parts Mounted
Position
Compressor Compressor in the
Model
D57C10RAW5 machine chamber
Rate input W 112/116 ( 220/240V 50Hz) at the rear side of
Startting current A 6.92/7.5 ( 220/240V 50Hz) the frame
Running current A 0.76/0.72 ( 220/240V 50Hz)
Measure the resistance with a tester.
Main wiring
Auxiliary wiring
(Ambient temperature: Room temperature 15 O C ~ 25 O C)
Motor protector Compressor in
Model MM3-17GDF the machine
120+5 O C or more
(5A or 5-18 second)
chamber at the
rear side of
61+11 O Open
Connected point
Close
C or less the frame.
(Ambient temperature: Room temperature 15 O C ~ 25 O C)
Normal
(Approx.)
31.7Ω
(Aprrox.)
Abnormal
(faulty)
Normal Abnormal(Faulty)
Less than 1Ω Opened (∞ Ω)
PTC Relay Compressor in
Model PTH7M330MD2 the machine
Measure the resistance with a tester. chamber at the
(Ambient temperature: Room temperature 15 O C ~ 25 O C) rear side of
18.1Ω
Opened(∞ Ω )
or
Short (0Ω)
As PTC Relay thermistor has
been heated while refrigerator
Normal Abnormal(Faulty)
is running, be sure to measure
the resistance after the thermistor
has got cool enough.
33Ω (Approx.)
- 7 -
Opened (∞ Ω ) or Short (0Ω)
the frame.

Components/
Part Name
Check Methode and Criterion
Refrigerator Fan grill of the
fan motor Model MH07DX5-TJA5
Measure the resistance with a tester.
(Ambient temperature: Room temperature 15 O C ~ 25 O Parts Mounted
Position
freezer compartment.
C)
830Ω (Approx.) Opened (∞ Ω ) or Short (0Ω)
Defrost heater Rated input W 150 In drip tray under
Power ON after defrosting
(14+1.5
evaporator of the
O operation method
C or more) freezer compartment.
Measure the resistance with a tester.
(Ambient temperature: Room temperature)
Opened (∞ Ω )
Thermistor ● Resistance measured under DEF thermistors
the ambient temperature from
radiator of the freezer
-50: to +50:
compartment.
1. 200" to 500k"
R-thermister , control
................Normal
panel of the refrigerator
2. Out of the above range
compartment.
Run capacitor
.................Abnormal
Thermistor Check Procedure
Normal Abnormal(faulty)
● Thermistor resistance will vary
with the change of temperature.
● Take the temperature around the thermistor,
and then measure resistance using a tester.
The relation of resistance and temperature is as shown on the above graph.
Rated input 400VAC
In the control
panel of the
Measure the resistance with a tester. refrigerator
compartment.
Normal
Normal
384Ω(Approx.)
Opened (∞Ω )
- 8 -
Abnormal(faulty)
Short (0Ω )
Abnormal(faulty)

6.2 HOW TO CHECK P.C BOARDS
MR-255J-A1
MR-255J-A(NZ)1
(1) Precautions
Unplug unit before checking
If the controller P.C. board box is opened with the refrigerator inside
cooled, dew will form on the control board, causing trouble such as
poor insulation.
The following cares must be taken when servicing.
1. Be sure to unplug the power cord before servicing.
2. Wipe away droplets on the control board box with dry cloth,
and dry it up before setting a new controller P.C board.
(2) How to check the controller P.C board and vicinity.
The control board box can be checked without opening the box.
Measure the voltage and resistance using 8 connectors outside How to check with connectors
the box. POWER ON
1. Check for 230V,240V output during power
ON. Make the pin No.7-9 of the 9-pin white connector as a
common pin, and measure the voltage between the common
mon pin and another pin.
Make sure that 230V ,240V is output.
Note: The room light always has 240V
2. Check for "thermistor" output during power ON
3-pin white connector
Make the oin No.1 of the 3 pin white connector as a common
pin, and measure the voltage between the common pin POWER OFF
and another pin.
Make sure that 2~3VDC is output.
3.Check for weak current wiring power OFF
3-pin white connector
Remove the connector, and measure the resistance across
-No.1 pin and No.2 pin to confirm the continuty for DEF thermistor.
-No.1 pin and No.3 pin to confirm the continuty for the Freezer
thermistor.
- 9 -
Running capacitor
CONNECTOR
CONTROL BOARD CONNECTOR

6.3 TEST POINT DIAGRAM OF MAIN CONTROL BOARD
MR-255J-A1
MR-255J-A(NZ)1
- 10 -

7 DISASSEMBLY INSTRUCTIONS
MR-255J-A1
MR-255J-A(NZ)1
l Unplug the power cord before servicing.
OPERATING PROCEDURE PHOTOS
1. Remove the crystal shelf (F). Ice cover,
ice tray and ice box.
Ice corner
2. Take out the ice corner after removing
Photo 1
the rivet at left side. (See Photo 1.)
Fan grill
3. Remove the catch at the upper side of
the fan grill using a screw driver, then
pull the fan grill toward you. (See Photo 2.)
Rivet
Bell mouth
4. Remove the catches at upper side of the
Photo 2
bell mouth and disconnect the connector
then pull out the bell mouth toward you.
(See Photo 3.)
Fan motor
Take out the fan motor after removing
the screws on the motor installation
plate. (See Photo 4.)
Catche
Thermal fuse
Take the thermal fuse out after cutting
Photo 3
the binder off. (See Photo 4.)
Catches
Defrost heater Drip tray
Fan
Lift and fix the evaporator with care
not to bend the pipe.
Remove the defrost heater from the
defrost heater from the defrost heater
cover, After removing the defrost
heater, remove the drip tray.
(See Photo 5.)
CAUTION ON ASSEMBLY
Insert the fan motor to the fan motor
Photo 4
shaft until stops, and rotate the
fan with your fingers to check the
fan operation.
When mounting the drip tray, place it in
the correct position, and make the slack
Bell mouth
in the lead wire to prevent water from Photo 5
entering the glass tube.
Attach the thermal fuse in the correct
position.
Attach the lead wires to the fixture.
Evaporator
- 11 -
Defrost heater
Bell mouth
Fan
Ice corner
Fan grille
Connectors
Fan motor
Thermal fuse
Heater cover
Drip tray

OPERATING PROCEDURE PHOTOS
1. Remove the silde chilled case, crystal Photo 6
shelf (RS).
Control panel
2. Remove the room light cover
(See Photo 6.)
3. Remove the screws, and pull the control
panel toward you.
(See Photo 6.)
p Control panel sub
4. Remove the screw at the center and
remove the control panel sub.
(See Photo 6.)
5. Remove the duct R, damper is installed Photo 7
inside back of the refrigerator.
(See Photo 6.)
Damper thermo
Peel off the tape from the joint of the
duct R, and take out the damper.
(See Photo 7.)
CAUTION ON ASSEMBLY
Use new tape and sealing material for
assembly.
To prevent poor contact, connect the
connectors completely.
1. Removing the compressor
(1) Hold the radiator plate and pull it out slowly not to overflow water.
(2) Slowly release gas from the charge pipe on the pressure side.
(3) Replace the compressor and the dryer at a time.
CAUTION ON ASSEMBLY
After replacing the compressor, be sure to evacuate the refrigerating cycle and charge gas into the charge pipe.
After replacement, check cooling operation and check the weld for gas leaking.
MR-255J-A1
MR-255J-A(NZ)1
- 12 -
Screw
Control panel
Room light
Screw
Control panel sub
Screw

8 PARTS LIST
DOOR, BODY, PARTS
MR-255J-A1
MR-255J-A(NZ)1
- 13 -

Q'TY/UNIT
NO. PART NO. PART NAME
SPEC
A1
255J
A(NZ)1
W ST W ST
1 KIEHP4101 DOOR LINER (F) 1 1 1 1
2 KIEE59131 FREE POCKET (F) 2 2 2 2
3 KIE401116 MIDDLE EGG CASE 1 1 1 1
4 KIE401115 LARGE EGG CASE 1 1 1 1
5 KIEE59118 FREE POCKET (R) 2 2 2 2
6 KIEA74127 MINI POCKET(LH) 1 1 1 1
7 KIEA74128 MINI POCKET(RH) 1 1 1 1
8 KIEE59134 BOTTLE POCKET 2 2 2 2
9 KIEA74143 BOTTLE STOPPER 1 1 1 1
10
KIEHA0001
KIEHP4001
DOOR F
1
1
1
1
11 KIEA78111 MAGNET GASKET ASSY (F) 1 1 1 1
12
KIEHA0000
KIEHP4000
DOOR R
1
1
1
1
13 KIEA78110 MAGNET GASKET ASSY (R) 1 1 1 1
14 KIEHP4100 DOOR LINER (R) 1 1 1 1
RECOMMEND PART NO. 10, 11, 12, 13
ABBREVIATION
F FREEZER ROOM
R
REFRIGERATOR ROOM
- 14 -
PRICE

ACCESSORY PARTS
MR-255J-A1
MR-255J-A(NZ)1
- 15 -

NO. PART NO. PART NAME
SPEC
W ST W ST
1 KIEA78662 BELL MOUTH 1 1 1 1
2 KIEHP4663 FAN GRILLE 1 1 1 1
3 KIEHP4454 ICE COVER 1 1 1 1
4 KIEHP4450 ICE CORNER ASSY 1 1 1 1
5 KIEA74654 SPECIAL RIVET 1 1 1 1
6 KIEA78665 DUCT R 1 1 1 1
7 KIEHP4305 THERMO DIAL (F) 1 1 1 1
8 KIEHP4850 CONTROL PANEL 1 1 1 1
9 KIEHP4315 THERMO DIAL (R) 1 1 1 1
10 KIEA74470 LAMP COVER 1 1 1 1
11 KIEA74411 SLIDE CHILLED CASE 1 1 1 1
12 KIEHP4850 CONTROL PANEL SUB 1 1 1 1
13 KIEA82420 CRYSTAL SHELF (RL) 2 2 2 2
14 KIE401461 LEG 1 1 1 1
15 KIEA74431 CRYSTAL SHELF (F) 1 1 1 1
16 KIEHP4440 ICE TRAY 1 1 1 1
17 KIEA74487 ICE BOX 1 1 1 1
18 KIEA74703 HINGE ASSY (MIDDLE) 1 1 1 1
19 KIEA74745 CATCHER 1 1 1 1
20 KIEE59423 CHILLED CASE DOOR 1 1 1 1
21 KIED63423 CRYSTAL SHELF (RS) 2 2 2 2
22 KIEA74405 VEGETABLE CASE 1 1 1 1
23 KIEA74702 HINGE ASSY (LOWER) 1 1 1 1
24 KIE702460 ADJUST FOOT 1 1 1 1
RECOMMEND PART NO. 10, 11, 12, 13
ABBREVIATION
F FREEZER ROOM
R
REFRIGERATOR ROOM
- 16 -
Q'TY/UNIT
255J
A1 A(NZ)1
PRICE

ELECTRICAL PARTS AND UNIT PARTS
MR-255J-A1
MR-255J-A(NZ)1
- 17 -
28

NO. PART NO. PART NAME
SPEC
A1
Q'TY/UNIT
255J
A(NZ)1
W ST W ST
1 KIEA78995 EVAPORATOR 1 1 1 1
2 KIEA74338 THERMAL FUSE 1 1 1 1
3 KIEA74397 HEATER ROOF 1 1 1 1
4 KIEE61392 DEFROST HEATER ASS'Y
240V 150W WITH
DEODORIZER
1 1 1 1
5 KIEA75397 HEATER COVER 1 1 1 1
6 KIEA74378 THERMISTOR (F) 1 1 1 1
7 KIEA74538 DRIP TRAY 1 1 1 1
8 KIEA75338 THERMAL FUSE 1 1 1 1
9 KIEHP4339 REFCON ASSY 1 1 1 1
10 KIEA01980 DRYER XH-9, 8GR 1 1 1 1
11 KIEA74435 DRAIN PAN 1 1 1 1
12 KIED18277 COMPRESSOR D57C10RAW5 1 1 1 1
13 KIEA01788 LOCK WASHER 3 3 3 3
14 KIEA01797 RUBBER MOUNT 4 4 4 4
15 KIEA74312 THERMISTOR (DEF) 1 1 1 1
16 KIE401329 FAN MOTOR BUSH 2 2 2 2
17 KIE401320 FAN MOTOR 1 1 1 1
18 KIECD4362 LAMP SWITCH MM7-271 2 2 2 2
19 KIEA74323 MOTOR ATTACH 1 1 1 1
20 KIE401321 FAN 1 1 1 1
21 KIEA90386 LAMP SOCKET 1 1 1 1
22 KIE402360 LAMP E12 240V 15W 1 1 1 1
23 KIEA74301 DAMPER THERMO MM1-6162 1 1 1 1
24 KIED18354 PLUG CORD ASSY 1 1 1 1
25 KIE803341 PROTECTOR COVER 1 1 1 1
26 KIEA74340 MOTOR PROTECTOR MM3-17GDF 1 1 1 1
27 KIEE76330 PTC RELAY PTH7M330MD2 1 1 1 1
28 KIECC9346 RUNNING CAPACITOR 4µF 400V AC 1 1 1 1
RECOMMEND PART NO. 2, 4, 6, 8, 9, 10, 15,18, 26, 27
ABBREVIATION
F
R
FREEZER ROOM
REFRIGERATOR ROOM
DEF DEFROST
- 18 -
PRICE

PACKING PARTS
MR-255J-A1
MR-255J-A(NZ)1
2
TOP COUSHION
5
BOTTOM CUSHION
6
C.F.B PALLET
- 19 -
1
C.F.B BOX ASSY
4
SIDE CUSHION ASSY
3
PACKING COVER

NO. PART NO. PART NAME
SPEC
W ST W ST
KIEEC3970 1
1
KIEHV2970
KIEHA0970
C.F.B BOX ASSY
1
1
KIEHP4970 1
2 KIEEC3979 TOP CUSHION 1 1 1 1
3 KIEG16973 PACKING COVER 1 1 1 1
4 KIEEC3971 SIDE CUSHION ASSY 1 1 1 1
5 KIEEC3978 BOTTOM CUSHION 1 1 1 1
6 KIEEC3974 C.F.B PALLET 1 1 1 1
- 20 -
Q'TY/UNIT
255J
A1 A(NZ)1
PRICE

MITSUBISHI ELECTRIC CORPORATATION
HEAD OFFICE : MITSUBISHI DENKI BLDG., MARUNOUCHI,TOKYO 100. TELEX : J24532 CABLE MELCO TOKYO
Distributed by Mitsubishi Electric Australia
MITSUBISHI ELECTRIC AUSTRALIA PTY LTD.
(Incorporated in New South Wales) ABN 58 001 215 792
New South Walse : Queensland/ South Australia :
348 Victoria Road, Northern Territory: 77 Port Road
Rydalmere 2116 Unit 12, 469 Nudgee Road, Hindmarsh 5007
Ph : (02) 9684 7777 Hendra, QLD 4011 Ph:(08) 8340 2000
Ph : (07) 3263 2000
Western Australia : Victoria / Tasmania :
Unit 5, 329 collier Road, Unit 4, 303 Burwood
Bassendean 6054 Hightway,
Ph : (089) 93777 3400 East Burwood 3151
Ph : (03) 9262 9855
Distributed by
BLACK DIAMOIND TECHNOLOGIES LIMITED (BDT)
Wellington Office (Head Office) Auckland Office Christchurch Office
1 Parliament Street Unit1, 4 Walls Road Suite 2, Level 1
PO Box 30-772 Penrose 37 Manderville Street
Lower Hutt Auckland PO Box 12-726 Chischurch PO Box 1604
Ph : (04) 560 9100 Ph: (09) 526 9340 Ph : (03) 341 7052
Fax : (04) 560 9133 Fax : (09) 526 9369 Fax : (03) 341 7054