Mitsubishi Electric )MR-385SL-W-A(NZ) User manual

Changes for the Better

Models MR-385S-W-A

MR-385S-ST-A

MR-385SL-W-A

MR-385SL-ST-A

MR-420S-W-A

MR-420S-ST-A

MR-455S-W-A

MR-455S-ST-A

CONTENTS

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

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

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

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

5. NAME OF THE PARTS...........................................

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

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

6.2 HOW TO CHECK P.C.BOARDS......................

6.3 TEST POINT DIAGRAM OF

MAIN CONTROL BOARD..............................

6.4 MULFUNCTION DISPLAY AND CHECKING

POINT...........................................................

6.5 IMPORTANCE DETAIL OF FAULT ANALYSIS.

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

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

1

7

10

11

13

14

16

17

18

19

20

23

MR-385S-W-A(NZ)

MR-385S-ST-A(NZ)

MR-385SL-W-A(NZ)

MR-385SL-ST-A(NZ)

MR-420S-W-A(NZ)

MR-420S-ST-A(NZ)

MR-455S-W-A(NZ)

MR-455S-ST-A(NZ)

A……......Australia

A(NZ) .....New Zealand

2006

SERVICE MANUAL

NO.SM-RE-0604

MITSUBISHI

ELECTRIC

HOME REFRIGERATORS

1.1 SPECIFICATIONS

MR-385S-A MR-385SL-A

MR-385S-A(NZ) MR-385SL-A

Power supply 230/240V 50Hz

Total capacity (Gross (AS)) L

Dimensions (HXWXD) mm. 1591 x 685 x 700

Cabinet Acrylic resin coated steel

Food liner ABS resin

Cabinet Foamed cyclopenthane

Freezer door Foamed cyclopenthane

Refrigerator door Foamed cyclopenthane

Cooling system Freezer Forced air convection

Refrigerator Surround cooling,multi air flow,front air flow

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 2 pcs.

Slide chilled case 1 pc.

Crystal shelf (F) 1 pc.

Crystal shelf (R) 3 pcs.

Free pocket 1 pc.

Egg rack 2 pcs.

Adjust pocket 2 pcs.

Bottle pocket 2 pcs.

Vegetable case 1 pc.

Tray V 1 pc.

Drain pan 1 pc.

Bottle stopper 1 pc.

Weight Unit kg 70

Shipping kg 76

- 1 -

Insulation

Accessories

385 (F : 130 R : 255)

1 SPECIFICATIONS

MR-420S-A

MR-420S-A(NZ)

Power supply 230/240V 50Hz

Total capacity (Gross (AS)) L

Dimensions (HXWXD) mm. 1696 x 685 x 700

Cabinet Acrylic resin coated steel

Food liner ABS resin

Cabinet Foamed cyclopenthane

Freezer door Foamed cyclopenthane

Refrigerator door Foamed cyclopenthane

Cooling system Freezer Forced air convection

Refrigerator Surround cooling,multi air flow,front air flow

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 2 pcs.

Slide chilled case 1 pc.

Crystal shelf (F) 1 pc.

Crystal shelf (R) 3 pcs.

Free pocket 1 pc.

Egg rack 2 pcs.

Adjust pocket 2 pcs.

Bottle pocket 2 pcs.

Vegetable case 1 pc.

Tray V 1 pc.

Drain pan 1 pc.

Bottle stopper 1 pc.

Weight Unit kg 74

Shipping kg 81

- 2 -

Insulation

Accessories

420 (F : 130 R : 290)

MR-455S-A

MR-455S-A(NZ)

Power supply 230/240V 50Hz

Total capacity (Gross (AS)) L

Dimensions (HXWXD) mm. 1806 x 685 x 700

Cabinet Acrylic resin coated steel

Food liner ABS resin

Cabinet Foamed cyclopenthane

Freezer door Foamed cyclopenthane

Refrigerator door Foamed cyclopenthane

Cooling system Freezer Forced air convection

Refrigerator Surround cooling,multi air flow,front air flow

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 2 pcs.

Ice box 1 pc.

Freezer pocket 2 pcs.

Slide chilled case 1 pc.

Crystal shelf (F) 1 pc.

Crystal shelf (R) 4 pcs.

Free pocket 1 pc.

Egg rack 2 pcs.

Adjust pocket 3 pcs.

Bottle pocket 2 pcs.

Vegetable case 1 pc.

Tray V 1 pc.

Drain pan 1 pc.

Bottle stopper 1 pc.

Weight Unit kg 78

Shipping kg 86

- 3 -

Insulation

Accessories

454 (F : 130 R : 324)

1.2 ELECTRICAL PARTS SPECIFICATION

MR-385S-A MR-385SL-A

MR-385S-A(NZ) MR-385SL-A

Model

Power supply

Compressor Rated input W

Starting current A

Running current A

Winding resistance (A.T. : 20 oC)

PTC RELAY

Model

Motor protector Ambient temperature oC

Time Sec.

Current A

Running capacitor

Capillary tube mm.

Dehydrant Molecular sieve g

Refrigerant HFC. 134a g

Defrosting control Defrosting timer

Defrost finish oC

Thermal fuse oC

Heater Defrost heater

Deodorition

Model

Type

Number of poles

Input W

Revolution r.p.m

Model Freezer Refrigerator (MM1-6177)

Dial position ON OFF OPEN SHUT

Warmer oC-13.7 -19.0 - 3.5

Normal oC-16.9 -22.9 MAX 5.0 -1.0 + 1.5

Colder oC-20.4 -27.5 - -12.5

Fan motor

Temperature control

- 4 -

DG57C96RAW5

106/108(220/240V 50Hz)

7.38/8.01(220/240V 50Hz)

0.57/0.55(220/240V 50Hz)

18.2 Ω(Main) / 17.7 Ω(Aux)

PTH7M330MD2

5TM181NHBYY

Less than 10.2/12 (220/240V 50Hz)

2520 + 200 / 2580+200 (220/240V 50Hz)

2p

25

16 MAX

5.4

4µF 400VAC

Single phase

∅ 1.8 X ∅ 0.7 X 2350

10

384 Ω (240V 150W)

Filter

220/240V 50Hz

UDVH15MA1H

145

Control board

Thermister 14 + 1.5

73

MR-420S-A

MR-420S-A(NZ)

Model

Power supply

Compressor Rated input W

Starting current A

Running current A

Winding resistance (A.T. : 20 oC)

PTC RELAY

Model

Motor protector Ambient temperature oC

Time Sec.

Current A

Running capacitor

Capillary tube mm.

Dehydrant Molecular sieve g

Refrigerant HFC. 134a g

Defrosting control Defrosting timer

Defrost finish oC

Thermal fuse oC

Heater Defrost heater

Deodorition

Model

Type

Number of poles

Input W

Revolution r.p.m

Model Freezer Refrigerator (MM1-6177)

Dial position ON OFF OPEN SHUT

Warmer oC-13.7 -19.0 - 3.5

Normal oC-16.9 -22.9 MAX 5.0 -1.0 + 1.5

Colder oC-20.4 -27.5 - -12.5

Fan motor

Temperature control

- 5 -

DG66C11RAW5

117/118(220/240V 50Hz)

8.05/8.83(220/240V 50Hz)

0.71/0.66(220/240V 50Hz)

15.4 Ω(Main) / 17.7 Ω(Aux)

PTH7M330MD2

5TM205NHBYY

Less than 10.2/12 (220/240V 50Hz)

2520 + 200 / 2580+200 (220/240V 50Hz)

2p

25

16 MAX

6.0

4µF 400VAC

Single phase

∅ 1.8 X ∅ 0.7 X 2350

10

384 Ω (240V 150W)

Filter

220/240V 50Hz

UDVH15MA1H

145

Control board

Thermister 14 + 1.5

73

MR-455S-A

MR-455S-A(NZ)

Model

Power supply

Compressor Rated input W

Starting current A

Running current A

Winding resistance (A.T. : 20 oC)

PTC RELAY

Model

Motor protector Ambient temperature oC

Time Sec.

Current A

Running capacitor

Capillary tube mm.

Dehydrant Molecular sieve g

Refrigerant HFC. 134a g

Defrosting control Defrosting timer

Defrost finish oC

Thermal fuse oC

Heater Defrost heater

Deodorition

Model

Type

Number of poles

Input W

Revolution r.p.m

Model Freezer Refrigerator (MM1-6177)

Dial position ON OFF OPEN SHUT

Warmer oC-13.7 -19.0 - 3.5

Normal oC-16.9 -22.9 MAX 5.0 -1.0 + 1.5

Colder oC-20.4 -27.5 - -12.5

Temperature control

- 6 -

Less than 10.2/12 (220/240V 50Hz)

2520 + 200 / 2580+200 (220/240V 50Hz)

DD66C13RAW5

127/131(220/240V 50Hz)

8.3/9.1(220/240V 50Hz)

Fan motor

UDVH15MA1H

Single phase

2p

4µF 400VAC

0.63/0.61(220/240V 50Hz)

12 Ω(Main) / 28.7 Ω(Aux)

Filter

∅ 1.8 X ∅ 0.7 X 2350

10

145

Control board

384 Ω (240V, 150W)

220/240V 50Hz

Thermister 14 + 1.5

73

25

16 MAX

6.0

PTH7M330MD2

5TM205NHBYY

Unit : mm

MR-385S-A

MR-385S-A(NZ)

MR-385SL-A

MR-385SL-A(NZ)

- 7 -

2 OUTLINES AND DIMENSIONS

20

685

20

1334

454

50

100

1591

700

REQUIRED SPACE FOR INSTALLATION

1950

PLUG CORD LENGTH

568

685

81591

942

73

Unit : mm

MR-420S-A

MR-420S-A(NZ)

- 8 -

PLUG CORD LENGTH

REQUIRED SPACE FOR INSTALLATION

20685

20

1334

454

50

100

1696

700

1950

568

685

81696

1047

73

Unit : mm

MR-455S-A

MR-455S-A(NZ)

- 9 -

PLUG CORD LENGTH

REQUIRED SPACE FOR INSTALLATION

20685

20

1334

454

50

100

1806

700

1950

568

685

81806

1157

73

(SKELETON WIRING DIAGRAM)

MR-385S-A

MR-385S-A(NZ)

MR-385SL-A

MR-385SL-A(NZ)

MR-420S-A

MR-420S-A(NZ)

MR-455S-A

MR-455S-A(NZ)

(ACTUAL WIRING DIAGRAM)

3 WIRING DIAGRAM

- 10 -

MR-385S-A MR-385SL-A MR-420S-A

MR-385S-A(NZ) MR-385SL-A(NZ) MR-420S-A(NZ)

- 11 -

4 REFRIGERANT CIRCUIT

MR-455S-A

MR-455S-A(NZ)

- 12 -

MR-385S-A MR-420S-A

MR-385S-A(NZ) MR-420S-A(NZ)

MR-385SL-A MR-455S-A

MR-385SL-A(NZ) MR-455S-A(NZ)

- 13 -

5 NAMES OF PARTS

6.1 TROUBLE CRITERION OF MAIN PARTS

MR-385S-A MR-385SL-A MR-420S-

A

MR-455S-A

MR-385S-A(NZ) MR-385SL-A(NZ) MR-420S-A(NZ) MR-455S-A(NZ)

Compressor

Measure the resistance with a tester.

(Ambient temperature:Room temperature 15oC ~ 25oC)

In the control

panel of the

Measure the resistance with a tester. refrigerator

compartment

Model

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

PTC RELAY PTH7M330MD2

Measure the resistance with a tester.

(Ambient temperature:Room temperature 15oC ~ 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.

Motor

protector

Abnormal

(faulty)

A 7.38/8.01(220/240V 50Hz)

0.57/0.55(220/240V 50Hz)

Normal

MR-385S/SL

Rated input

MR-420S,455S

6 TROUBLE SHOOTING

120 + 5o C

400VAC

Run capacitor

Opened (∞ Ω )

W

the machine

chamber at the

Rated input

- 14 -

Connected

Point

Model

Normal

A

bnormal(faulty)

Less than 1Ω

rear side of

Opened (∞ Ω )

69 + 9o C

the frame

Starting current

Running current A

chamber at the

Compressor in

the machine

chamber at the

rear side of

the machine

Components/

Part Name

Model

Parts Mounted

Position

Check Method and Criterion

DG57C96RAW5

MR-420S,455SMR-385S/SL

DG66C11RAW5

Compressor in

the frame

Compressor in

rear side of

the frame

Close

Open

Normal

Main wiring

Auxilliary wiring 17.7 Ω (Approx.)

5TM181NHBYY 5TM205NHBYY

Abnormal(faulty)

Opened(∞ Ω )

or

Short (0Ω)

117/118(220/240V 50Hz)

8.05/8.83(220/240V 50Hz)

0.71/0.66(220/240V 50Hz)

106/108(220/240V 50Hz)

18.2 Ω (Approx.)

17.7 Ω (Approx.)

15.4 Ω (Approx.)

A

bnormal(faulty)

Opened (∞ Ω ) or Short (0Ω)

33 Ω (Approx.)

Short (0Ω )

MR-420S,455SMR-385S/SL

69 + 9o C

120 + 5o C

Auxilialy

wiring

Main

wiring

5

6

3

2

5

6

2

3

In fan grill of the

freezer compartment.

Measure the resistance with a tester.

(Ambient temperature:Room temperature 15oC ~ 25oC)

In the drip tray under

the evaporator of the

freezer compartment

Measure the resistance with a tester.

(Ambient temperature:Room temperature 15oC ~ 25oC)

Resistance measured under Defrost thermistor

the ambient temperature fro

m

(k

Ω

)at the muffler

-50: to +50: of evaporator

in freezer compartment.

1. 200" to 500k"

............normal Freezer thermistor at

2. Out of the above range fan grille of freezer

............abnormal compartment.

Out air thermistor

under hinge cover

Thermistor Check Procedure

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.

- 15 -

Short (0Ω)

Rated input 150 W

Operation method Power ON after defrosting

(14 + 1.5oC or more)

Thermistor

Opened ( ∞ Ω )

Defrost

Heater

Abnormal (faulty)Normal

384Ω (Approx.)

Abnormal(faulty)

Refrigerator

fan motor

560+ 10% ( Ω )

UDVH15MA1H

Model

Normal

Check Method and Criterion Parts Mounted Position

Components/

Part Name

Resistance

-20 20 30

-10 010

30

20

15

10

5

0

25

35

Thermistor resistance valves against

temperature

Temperature

Outside air thermistor

Freezer

thermistor,

Defrost

thermistor

Inner

thermistor

6.2 HOW TO CHECK P.C BOARDS

MR-385S-A MR-385SL-A MR-420S-A MR-455S-A

MR-385S-A(NZ) MR-385SL-A(NZ) MR-420S-A(NZ) MR-455S-A(NZ)

(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

the box. How to check with connectors

1. Check for 230/240V output during power on. POWER ON

Make the pin No.7,9 of the 9 pins white connector as a common pin,

and measure the voltage between the common pin and

another pin.

Make sure that 230/240V is output

Note: The room light always has 230/240V.

2. Check for "Thermistor" output during power on.

5 pins white connecto

r

Make the pin No.1 of the 5 pin white connector as a

common pin, and measure the voltage between the common

pin and another pin.

Make sure that 2-3 VDC is output.

POWER OFF

3.Check for weak current wiring during power off

5 pins white connecto

r

Remove the connector, and measure the resistance across

-No.1 pin and No.2 pin to confirm the continuity for DEF

thermistor.

-No.1 pin and No.3 pin to confirm the continuity for the

Freezer thermistor.

- 16 -

6.3 TEST POINT DIAGRAM OF MAIN CONTROL BOARD

MR-385S-A MR-385SL-A MR-420S-A MR-455S-A

MR-385S-A(NZ) MR-385SL-A(NZ) MR-420S-A(NZ) MR-455S-A(NZ)

- 17 -

6.4 Malfunction Display and Checking points.

6.4.1 ) Malfunction display will use LED for show self-check

6.4.2 ) Fucntion display

Lighting mode (time amount) will blink by on 3 min. as fixed times amount after that will off 5 seconds, which will repeat as cycle sample.

6.4.3 ) Repairing and check point

* A the case below , if the analysis result has malfunction over 2 points and will express in the list has more importance.

Function display Cause Analysis result Check point Corrective Priority Repairing

2. Check the resistance of thermistor Change part

2. Check the resistance of defrost heater Change part

3. Check the resistance of temp. fuse Change part

Caution

1. Before plug in the AC power , Be ensure the comp had been off more than 20 min.

Fault trouble of defrost heater

Open circuit or short

circuit case

Open circuit or short

circuit case

- 18 -

2. The consider short circuit or open circuit of thermistor , resistance of open circuit is

∞

Ω

, resistance of short circuit is 0 Ω

1. Check connector of control PCB CN5 ,

relay connector 6 pin

1. Check connector of control PCB CN5 ,

relay connector 2 pin

Improve in contact

LED display self - check

Malfunction display

Lighting mode

1 time

2 times

3 times Defrost unfinished

with in 2 hours

Fault trouble of defrost thermistor

Fault trouble of freezer thermistor

2

1

Improve in contact

1. Check connector of control PCB CN1 ,

relay connector temp. fuse

3

ON

OFF

5 Sec.

Cycle

2 times1 time

Cycle Cycle Cycle

5 Sec. 5 Sec. 5 Sec.

1 time

1 time1 time 2 times

2 times 2 times

6.5 Importance detail of fault analysis

6.5.1 Flow chart of self - check

1) Self - check monitor circuit

For show the fault condition of refrigerator and clarify point. Therefore, self - check monitor control is provided

that are able to monitor No. of blinking condition with electric circuit and electric part . Before disconnect power plug please

confirm LED self - check .

"CONTROL PANEL"

LED show shelf - check

Caution

1. As the part list below couldn't analysis by self - check , then

please check by reference to trouble shooting page.

- Dilapidation of door switch ,refrigerator room and freezer room.

- Dilapidation of compressor and fan motor .

2. If have malfunction when supply the power . Compressor and

fan motor will not operate 20 minutes.

2) Interval of self check analysis

- Troubles of thermistor : will check always.

- Trouble of defrost heater : will just analyse during defrost display only.

(The period checking will analyse the defrost circuit after connect the plug 2 hours )

- 19 -

Refrigerator

plug connect?

Connect power plug

Self - check

Mal Function Display

(No .of blinking)

No change on display Normal operation

Check the fault point as

malfunction list

Disconnect power plug

Repair the macfunction cause

Connect power plug

No

Yes

No

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Mitsubishi Electric )MR-385SL-W-A(NZ) User manual

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