Sharp SJ-XF50X-T Service Manual

SERVICE MANUAL

This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

Refrigerator-freezer

MODEL

SJ-XF50X-T

No.S0311SJF50XTFT

DESTINATION F

CONTENTS

Refer to "REFRIGERATING-CYCLE REPAIR MANUAL" for handling this refrigerant.

Refrigerant; R600a

[1] PRODUCT SPECIFICATIONS

1. SPECIFICATIONS ………………………… 2

2. ACCESSORIES …………………………… 2

3. AUTOMATIC ICE MAKING ……………… 3

[2] DESIGNATION OF VARIOUS PARTS

1. PART NAMES ……………………………… 4

2. INTERNAL STRUCTURE ………………… 5

3. FLOW OF COOL AIR ……………………… 6

4. TEMPERATURE DISTRIBUTION ………… 7

[3] DIMENSIONS

1.

OUTER DIMENSIONS AND CLEARANCE

…8

2. INNER DIMENSIONS ……………………… 9

[4] ELECTRICAL CIRCUIT DIAGRAMS …………10

1. WIRING DIAGRAM …………………………10

2. ELECTRIC ACCESSORIES LAYOUT …… 11

3.

PRECAUTIONS FOR USING LEAD-FREE SOLDER

……12

[5] ELECTRICAL SYSTEM SPECIFICATIONS …13

1. FUNCTIONAL PART SPECIFICATIONS …13

2. MODE FOR DISPLAY ………………………14

[6]

REFRIGERATION CYCLE SYSTEM SPECIFICATIONS

1. R600A PRECAUTIONS ……………………15

2.

TABLE OF R600A CHARACTERISTICS

…15

3. REFRIGERATION CYCLE DIAGRAM …… 15

[7] TROUBLESHOOTING

1. SELF-DIAGNOSIS MODE …………………18

2.

FORCED STOPPING OF DOOR ALARM BUZZER

…2 2

3.

THERMISTOR CIRCUIT CHECK METHOD

…22

4.

INSPECTION FLOWCHART AND REPAIR ITEMS

…2 3

5.

PLASMACLUSTER OK/NG JUDGMENT

…2 5

[8] DISASSEMBLY/ASSEMBLY

1.

GENERAL DISASSEMBLY SEQUENCE

…2 6

2.

REFRIGERATOR COMPARTMENT DISASSEMBLY

…2 7

3. FREEZER COMPARTMENT/ICE
COMPARTMENT DISASSEMBLY ………29

4.

VEGETABLE COMPARTMENT DISASSEMBLY

…3 1

5. HOW TO REMOVE OP. PWB ASS'Y ……32

6. HOW TO REMOVE TERMINAL BOX ……33

7. HOW TO INSTALL R-SUB PACKING ……33

8.

HOW TO INSTALL DUCT RT ASS'Y COVER

…3 4

9.

ADJUSTMENT OF R-DOOR (DOUBLE DOOR)

…3 5

10

. MAIN PARTS ASSEMBLY …………………36

Parts Guide

SJXF50XT

2

[1]

PRODUCT SPECIFICATIONS

SPECIFICATIONS1.

Item SJ-XF50X-T

Rated voltage/Rated frequency 110V~60Hz

Rated current (W) 118

Rated power input of heating systems (W) 171

Defrosting input (W) 130

Defrosting heater input (W) 130

O u t e r d i m e n s i o n s
Width×Depth×Height

(mm) 685 x 699 x 1820

Rated total storage volume 501L (17.7 cu.ft.)

Refrigerator compartment 268L (9.47 cu.ft.)
Freezer compartment (upper) 28L (0.99 cu.ft.)
Freezer compartment (lower) 96L (3.39 cu.ft.)
Ice compartment 19L (0.67 cu.ft.)

Vegetable compartment 90L (3.18 cu.ft.)
Weight (kg) 89
Refrigerant (Charging quantity) [Flammable] R600a (68g)
Insulation blowing gas [Flammable] Cyclo pentane (HC)

Cabinet

Inner box material ABS plastic

Outer shell material

PET steel
(Hot dipped zinc plated steel sheet with baked polyester resin coating)

Door

Door shell material Steel
Door inner material ABS plastic

Temperature control Automatic(adjustable)

Defrosting system

Heater system

(automatic start, automatic fi nish)
Refrigerator lamp LED (8 pcs)
Adjustable legs 2
Casters 4

Climate class ST

PLUG TYPE

Plug cord 2pin
Plug type A-1
Destination mark F

COLOR

Items -T

Outside color Brown

Inside color White

ACCESSORIES2.

Refrigerator Compartment

R shelf 2

Free set shelf (front/back) 1 each

Chilled case 1

Chilled case tray 1
Case 1
Door pocket (left) 2

Door pocket (right) 2

Egg case 1

Egg tray 1

Bottle pocket (left/right) 1each
Water tank (Tank cap, Lock lever, Slide

cap, Filter case, Water tank, Water fi lter)

1

SJXF50XT

3

Freezer compartment (Upper)

Freezer case (Upper) 1

Stainless tray 1

Freezer compartment (Lower)
Freezer case (top) 1

Freezer case (bottom) 1

Ice compartment

Ice storage box 1

Noise-proof sheet 1

Ice scoop 1

Vegetable compartment

Vegetable case 1

Fruit case 1

Pet case 1

Stainless tray 1

Other Accessories and Printed Materials

Foot grille 1

Operation manual 1

Warranty card 1

AUTOMATIC ICE MAKING3.

Water supply method: Storing water in tank/Direct water supply to ice cube maker•

Water tank volume: Approx. 1.0 L•

Ice making capacity (External air temperature: 30ºC, No door opening/closing, Temperature control: “•

中

”, Ice-making mode: “通常”)

Ice cube size Standard Large

Daily Approx. 1.2 kg Approx. 1.5 kg

Once (8 pieces) Approx. 100 g Approx. 230 g

Ice-making time/once•

Ice cube size Standard Large

Ice making
mode

通常

Approx. 2 hours Approx. 3 hours and 30 minutes

明亮

Approx. 6 hours Approx. 8 hours

急速

Approx. 1 hour and 20 minutes Approx. 2 hours

Others: Water filter is attached.•

Ice scoop is provided.

Enables test operation with the cleaning function.

Heat-resistant temperature of water tank: Approx. 60ºC•

Ice storage quantity•

Ice cube size Standard Large

Normal Approx. 4

0

0 to 64 pcs. Approx. 24 to 32 pcs.

Maximum (when leveled) Approx. 88 to 104 pcs. Approx. 40 to 48 pcs.

SJXF50XT

4

[2] DESIGNATION OF VARIOUS PARTS

PART NAMES1.

Parts names in parentheses "[ ]" are denominations used in the Operation manual.

>@

Ice compartment

Freezer compartment (upper)

Freezer compartment (lower)

Freezer compartment (lower)

Noise-proof sheet

Ice storage box

Ice scoop

F case sus

F case s

F top case

F bottom case

Vegetable case

Fruit case

V case sus

Pet case

Vegetable compartment

Vegetable compartment

Free set shelf

Egg case
Egg tray

Water tank

Cool plate

Case

Chilled case
C case tray

LED

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

[ ]

Plasmacluster unit

R shelf

Bottle pocket(left)

Bottle pocket(right)

Door pocket(left)

Door pocket(right)

[ ]

[ ]

[ ]

[ ]

SJXF50XT

5

INTERNAL STRUCTURE2.

Catalyzer

Humidity sensor

OP. PWB

Proximity switch

Thermo fuse

Catalyzer

Ice compartment

Freezer compartment (upper)

Vegetable compartment

Refrigerator compartment

R-shower duct ass’y

D-fan motor PCI

Damper ass’y

Thermistor

Ice cube heater

Evaporator

V-thermistor (G-thermistor)

V heater

Damper

Terminal box

(Main PWB, EECON-INV PWB, REACTANCE)

Compressor, protector, valve turret

Fan motor g

Condensor unit

Caster

Evaporating pan

Side view

Adjustable leg ass’y

F proximity switch

Ice maker ass’y

R door switch

LED PWB ass’y

Cool plate

LED PWB ass’y

R-thermistor

Gear pump

Water pipe ass’y

Water pipe heater

Tank heater

F-thermistor

Evaporator

Heater

Front view

Temp.control PWB

Fan motor f

DEF thermistor

Duct heater

Freezer

compartment (lower)

SJXF50XT

6

FLOW OF COOL AIR3.

Flow of Cool air

Ice compartment

Refrigerator compartment

Freezer

compartment (lower)

Freezer

compartment (upper)

Vegetable compartment

Side view

Front view

Freezer

compartment (lower)

Freezer

compartment (upper)

Refrigerator compartment

Ice compartment

When Plasmacluster ion is in operation.

SJXF50XT

7

TEMPERATURE DISTRIBUTION4.

●

The temperatures above are indications under the condition of no

food inside, doors closed and surrounding temperature is 30 after
stabilized the inside temperature. (Temperature adjustment is "中")

Approx.3 ~ 7°C

Approx.2 ~ 5°C

Approx.3 ~ 7°C

Approx.0 ~ 2°C

Approx.-17 ~ -19°C

Approx.-18 ~ -20°C

Approx.-18 ~ -20°C

Approx.3 ~ 8°C

SJXF50XT

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[3] DIMENSIONS

OUTER DIMENSIONS AND CLEARANCE (UNIT:mm)1.

198

281

699

285 396

551

632.5

661.5

608

68

626.5

4

685

1820

853.2180.8

335

365

8

8

15.5

90

50

709

930

1043

705

60 60

Moving wheels

back side

Moving wheels

front side

(Adjustable feet)

More than

More than

More than

135°135°

60

More than

More than

60

SJXF50XT

9

INNER DIMENSIONS2.

The dimensions between shelves can be changed by setting the shelves on the other rails.•

311

292

311

562

292

282

118

156

118

67

95

95

96

246

226

355.5

79.5

70

70

398.8

392

383

235

139

44

112

558

543

542

135

269

269

236

268

144

144

75

75

144

75

144

75

138

123

123

183

135

94

163

398.8

89

81

98

68

311

811651

292

123

138

116

145

22

mm

311

106

354

172

206

211

301

213

238

88

253

310

63

218

519

532

393

94.5

109.5

137.5

172

57

SJXF50XT

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[4] ELECTRICAL CIRCUIT DIAGRAMS

WIRING DIAGRAM1.

Source cord

Reactance

Main PWB

OP
PWB

EECON-INV
PWB

Protector

Compressor

Fan
motor g

Fan
motor f

LED
PWB
(left)

Temp.
control
PWB

Indicator
PWB

Plasmacluster
unit

Motor

D-fan motor PCI

Gear
pump

Damper

R
thermistor

F thermistor

DEF

thermistor

Ice maker unit

Motor

Switch

Thermistor

Proximity
switch

F proximity
switch

Ice cube
heater

R door
heater

V heater

Duct
heater

V thermistor

V damper

Door
switch
(left)

Door
switch
(right)

LED
PWB
(right)

Terminal box

Valve turret

Humidity sensor

Heater

Thermo fuse
Tank heater

Water
pipe
heater

SJXF50XT

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ELECTRIC ACCESSORIES LAYOUT2.

Harness

Harness

Harness

Harness

Harness

Harness

Earth harness

G-fan

Source cord

Black

White

Green

Green

Reactance

Reactance

WhiteWhite

Heater

V thermistor

V damper

YellowBrown

F-proximity

switch

Duct

heater

V-heater

V-heater

Humidity

sensor

R door heater

OP.PWB

Valve turret

Tank heater

Ice cube heater

Water pipe heater

EECON-INV PWB

Green

MAIN PWB

TEMP.CONTROL

PWB

Terminal box

Compressor room

Red

Black

Gray

Yellow

Indicator

PWB

Orange

White

Blue

Motor

Red

Black

Gray

Yellow

Orange

White

Brown

Red

Orange

Yellow

Light green

Blue

Brown

Brown

Black

White

Gray

Red

Red

Orange

Yellow

Light green

Damper harness

Orange

Yellow

Blue

Light green

R door switch

(left)

R door

switch(right)

White

White

Orange

Brown

R thermistor

Red

Red

Yellow

Black

Gear pump

Purple

Purple

Gray

Gray

Blue

Blue

Light green

Light green

R-damper

Brown

White

Orange

Orange

Water pipe

Water pipe

heater

Ice cube tray

Ice cube heater

Brown

Light

green

TEMP. CONTROL PWB

Thermistor

Ice maker unit

Harness

SW

Motor

Red
Brown

Red

Blue

Orange

Light green

Yellow

Yellow

White

White

White

White

White

Light green

Proximity

switch

Black

Black

Red

Orange

Yellow

Light green

Blue

Purple

Gray

White

Black

Brown

Red

Orange

Yellow

Light

green

Blue

Tank heater

LED PWB

(left)

LED PWB

(right)

White

Gray

White

Gray

Humidity

sensor

Brown

Red

Orange

Yellow

R door

heater

White

White

Purple

Blue

OP PWB

Brown Brown

Red

Red

Red

Orange

Orange

Orange

Yellow

Yellow

Yellow

Light

green

V damper

V thermistor

Black

White

Gray

Purple

Blue

Light green

White

Brown

Black

Black

Red

White

White

Gray

Black

Brown

Heater

F proximity

switch

Thermo fuse

Blue

Blue

Orange

Blue

Brown

Yellow

Black

Brown

Fan motor

F thermistor

DEF thermistor

Duct heater

Red

Red

Orange

Yellow

Light green

White

White

White

White

Blue

Blue

Black

Black

Brown

Indicator PWB

LED PWB(right)
LED PWB(left)

R door switch(left)
R door switch(right)

Brown

Brown

Brown

Brown

White

White

White

White

Orange

Orange

Orange

Orange

Orange

Purple

Light green

Light green

Light green

Red

Red

Red

Red

Yellow

Yellow

Yellow

Yellow

Blue

Blue

Blue

Black

Black

Gray

Gray

Gray

Gray

Gear

pump

R

damper

Purple
Light green

Brown

Brown
White

Orange

Orange

Light green

Light green

Red

Yellow

Blue

Red

Red

Black

Yellow

Yellow

Blue

Gray

Proximity switch

Moter

Moter

Inverter DC harness

Yellow

Green

Blue

Black

Blue

Brown

White

Red

Gray

Compressor ass’y

Comp. harness

Compressor

Blue

Protector

Black

Brown

Red

Blue

Gray

Purple

Black

Valve turret

Valve turret

Brown

Orange

Light green

Red

Yellow

Brown

Orange

Light green

White

White

White

White

White

Black

Brown

Brown

Orange

Light green

Light green

Light green

Red

Yellow

Brown

Orange

Brown

Brown

Orange

Red

Red

Yellow

Orange

Red

Yellow

Purple

SJXF50XT

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PRECAUTIONS FOR USING LEAD-FREE SOLDER3.

1) Employing lead-free solder

The PWB of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the
service manual. The suffi x letter indicates the alloy type of the solder.

Example:

Indicates lead-free solder of tin, silver and copper

2) Using lead-free wire solder

When repairing a PWB with the "LF" symbol, only lead-free solder should be used. (Using normal tin/lead alloy
solder may result in cold soldered joints and damage to printed patterns.)

As the melting point of lead-free solder is approximately 40°C higher than tin/lead alloy solder, it is recommend that a
dedicated bit is used, and that the iron temperature is adjusted accordingly.

3) Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wettability, (fl ow), to prevent damage
to the land of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended
period of time. Remove the bit as soon as a good fl ow is achieved.The high content of tin in lead free solder will
cause premature corrosion of the bit. To reduce wear on the bit, reduce the temperature or turn off the iron when it is
not required.

Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their
characteristics, making good soldering more diffi cult. It will be necessary to clean and replace bits more often when
using lead-free solder. To reduce bit wear, care should be taken to clean the bit thoroughly after each use.

SJXF50XT

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[5] ELECTRICAL SYSTEM SPECIFICATIONS

FUNCTIONAL PART SPECIFICATIONS1.

Part Name Specifi cations Function

Fan motor F

Model No.: 4715JL-09W-S37
Rating: DC15V
Power Input: 1.05W (Vs:2.6V)

For cooling
(For freezer compartment)

Fan motor g

Model No.: 4515JL-09W-S10-G01
Rating: DC12V
Power Input: 1.2W

For condensing
(Out side refrigerator)

D-fan motor PCI

Model No.: D09F-12SM20(EX)
Rating: DC12V 0.13A
Power Input: 1.56W

For ion releasing
(For refrigerator compartment)

Damper ass'y (R damper) 415 ± 50Ω (25°C) For refrigerator compartment temperature control

Damper (V damper) 415 ± 50Ω (25°C) For vegetable compartment temperature control

Motor Rating: DC12V 0.13A 300Ω Deodorant/bacteria elimination switching damper

Door switch 5mA 5V DC

For detection of opening or closing of the door
(For refrigerator compartment)

Proximity switch DC15V 100mA 1W

For detection of opening or closing of the door
(For Ice compartment)

F proximity switch DC15V 100mA 1W

For detection of opening or closing of the door
(For freezer compartment (bottom))

Compressor

Model No.: VESD9C+
Rating: 100V 50/60Hz
Resistance value: 9.6Ω (at 25°C)

Protector

MODEL: MSP59AMN-6
Operating temperature: 120°C

For compressor overload prevention

Main PWB For main control

OP.PWB

3.3V 4mA 12mW (Green)

2.3V 10mA 22mW (Red)

3.3V 5mA 16mW (Blue)

For operation panel control (door panel)

LED PWB 15V 72mA x 1.125W For refrigerator compartment illumination

Indicator PWB 3.2V 20mA 38mW For display of Plasmacluster operation

Source cord 125V 7A Source cord (2 Pin + earth)

F thermistor Resistance: 6.4kΩ (at 0°C) For detection of the freezer compartment temperature

R thermistor Resistance: 6.4kΩ (at 0°C) For detection of the refrigerator compartment temperature

DEF thermistor Resistance: 15kΩ (at 0°C) Senses when defrosting is completed

Thermo fuse

Rating: 250 V 10 A
Rated operating temperature: 77°C

For defrosting temperature excessive rise prevention

Thermistor Resistance value: 6.0kΩ (at 0°C) For detection of ice tray temperature

G-thermistor (V-thermistor) Resistance: 1.94Ω (at 0°C) For detection of vegetable compartment temperature

Gear pump Supplies water to the ice cube maker

Heater 110V 130W 93Ω For defrosting

Plasmacluter unit DC12V 20mA For bacteria elimination in compartment

Reactance 9mH±10% Class E wiring

Temp. control PWB For operation panel control (inside)

EECON-INV PWB 100V 50/60Hz For compressor drive

Duct heater 6.0W 1666Ω±7% For prevension of frosting

Humidity sensor 0.5mA DC5V For detection of outside temperature and humidity

Ice cube heater 12W 833Ω For making clear ice cube

Partition heater(R door heater) 3.4W/2910Ω For refrigerator compartment door condensation prevention

Water pipe heater 2.8W/3565Ω For water pipe freezing prevention

Tank heater 1.0W/9638Ω Avoid the water tank from freezing

V heater ass'y 9.0W/1110Ω For vegetable compartment temperature compensation

Valve turret For switching refrigerant

:Unexchengeable parts or Independently unexchangeable parts.

SJXF50XT

14

MODE FOR DISPLAY2.

How to set the product in this mode2-1.

Open the doors of the refrigerator compartment and the ice compartment within 2 minutes after turning ON the •

power to the main unit, and press and hold the [

冷凍

] button for 5 seconds or longer.

How to cancel this mode2-2.

With the doors of the refrigerator compartment and the ice compartment opened, press and hold the [•

冷凍

]

button for 5 seconds or longer.

Even if the main power supply is turned OFF, the display mode will be maintained. (not be cancelled)

Operation in the display mode2-3.

Each load (compressor, each fan motor, all heaters, damper, ice release motor, water pump motor) stops.1)

The damper is normally kept opened.2)

Even if the ice compartment or the freezer compartment (lower) door is opened, the door-open buzzer does 3)

not sound.

When the refrigerator compartment door is opened:4)

The refrigerator compartment illumination lamp and indicator LED are lit.•

The cooling/refrigerator compartment PCI fan motor operates.•

The door-open buzzer does not sound.•

Operation panel5)

<Inside of compartment>

The temperature control lamps (five lamps) will blink in sequence one by one.•

If the operation panel button is operated, ordinary operation is executed until the refrigerator compartment door •

is closed.

Note: For indication only. Each mode operation is not executed.

<Outside of compartment>

The operation panel lamps on the door will blink in sequence one by one.•

SJXF50XT

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[6] REFRIGERATION CYCLE SYSTEM SPECIFICATIONS

R600A PRECAUTIONS1.

• Do not use any refrigerant other than R600a.

• Gas leak testers for HFC-134a, CFC-12, HCFC-22, etc., cannot be used.

• A special tool is used for the R600a cycle.

TABLE OF R600A CHARACTERISTICS2.

Refrigerant saturated vapor pressure table R600a

(Unit) Temperature: °C, Pressure: kgf/cm abs

Temperature

Pressure

-20 -15 -10 -5 0 10 15 20 25 30 35 40 45 505

0.74

1.601.340.91 1.11 1.91 2.25 2.64 3.08 3.58 4.13 4.74 5.42 7.006.17

(Unit)Temperature:°C, Pressure: MPa abs

Temperature

Pressure

-20 -15 -10 -5 0 10 15 20 25 30 35 40 45 505

0.073

0.1570.1310.089 0.109 0.187 0.221 0.259 0.302 0.351 0.405 0.465 0.532 0.6860.605

REFRIGERATION CYCLE DIAGRAM3.

Piping Diagram 3-1.

①

②

③

⑤

⑨

⑬

⑭

⑮

⑪

⑧

④

⑯

⑫

⑥

⑩

⑱

⑰

⑦

Charge pipe

←（①～⑱）

Show the order of the refrigerant flow

Back

condenser

Dryer

Capillary

tube A

Evaporator

Capillary

tube B

Suction
connector

Suction
pipe

Charge pipe

Compressor

Discharge pipe
ass’y

Side condenser R

Dew proofing condenser

Bottom condenser

Side condenser L

Extension

barrel

Extra
cond.
unit
ass’y

SJXF50XT

16

Schematic diagram3-2.

R-valve ass’y

Charge pipe
(Low presure side)

Side condenser L

Side
condenser R

Dryer

Back condenser

Bottom condenser

Charge pipe
(High presure side)

D.P
condenser

Suction connector

Suction pipe

Compressor

Evaporator

Discharge pipe kit

Extra cond. unit kit

Extra cond.
unit

Capillary tube A

I. D.0.55

Capillary tube B

I. D.0.7

Piping detail drawing3-3.

: Pinch point

Compressor

R-valve ass’y

Side condenser R
Inlet

Dew proofing
condenser Inlet

Side condenser R Outlet

Back condenser ass’y Outlet

Bottom condenser ass’y Outlet

Bottom condenser ass’y Inlet

Capillary tube B

Capillary tube A

Back condenser Inlet

Extra cond.unit
ass’y

Dryer

Dew proofing
condenser Outlet

Side condenser L Outlet

Side condenser L Inlet

Discharge pipe
ass’y

SJXF50XT

17

Specifi cations of Refrigerant Valve Operation3-4.

Modes and operating conditions of refrigerant valve (3-way valve)1)

Valve is fully closed:1.

• This mode is used in compressor OFF status.

Only fine capillary is opened:2.

• During normal cooling operation

Only wide capillary is opened:3.

• During cooling operation under large load

Both capillaries are opened4.

• The refrigerator is set in this mode for only one minute after the power supply is turned ON. This mode is used
for vacuuming. During cooling operation, this mode is not used.

• Differentiation between fi ne capillary and wide capillary

- Fine capillary: Capillary tube A

- Wide capillary: Capillary tube B

- The fi ne capillary is identifi ed with a yellow mark.

Fault and status of refrigerant valve2)

• There is no method to give an instruction from the PWB and confi rm the valve position.

Refrigerant valve status Problem

1

Both capillaries are opened, and the valve does not operate.
No problem on cooling operation

No problem

2

Only the fi ne capillary is opened, and the valve does not operate.
Cooling performance deteriorates under large load.

Refrigerant shortage may occur, causing frost around
the evaporator inlet to increase.

3

Only the wide capillary is opened, and the valve does not operate.
No problem on cooling operation

No problem

4

Both capillaries are closed, and the valve does not operate.
Cooling operation is disabled.

Cooling operation is disabled even when the

compressor is ON.

• Fault of the refrigerant valve cannot be displayed in the self-diagnosis mode.

SJXF50XT

18

[7] TROUBLESHOOTING

SELF-DIAGNOSIS MODE1.

Outline1-1.

The self-diagnosis mode stores fault data for 5 days in the past (including “today”), and displays them by the date •

in the order of occurrence.

Self-diagnosis data to be displayed

Storage of self-diagnosis result

Current fault Fault history

All faults that have currently occurred
(Displayed in the order of fault number)

Faults that occurred in the past fi ve days
(Displayed by the date in the order of occurrence)

Storage of fault data for the past fi ve days
(Up to 9 items per day)

Self-diagnosis display•

Mode input

“Current”
fault display

“Today” fault
history display

“1-day before”
fault history display

“2-days before”
fault history display

“3-days before”
fault history display

“4-days before”
fault history display

Button
operation

Button
operation

Button
operation

Button
operation

Button
operation

Display priority is given to the upper stages
of self-diagnosis display (Table 1) (All items)

The last fault on that day is displayed first, and the older ones
are displayed in the order of occurrence. (Up to 9 items per day)

(Note 1) Self-diagnosis result data for 5 days (including “today”) are stored. 24 hours from the time when the
refrigerator power supply turned ON is defi ned as “one day”.

24 hours 24 hours 24 hours 24 hours 24 hours 24 hours

Today

Current time

1-day before 2-days before

Stored data

3-days before 4-days before

n-days before

Refrigerator power supply
is turned ON

(Note 2) How to clear stored data

After turning ON the power to the main unit, open the doors of the refrigerator compartment and the ice 1)

compartment within 2 minutes, and press and hold the [

冷凍

] button for 5 seconds or longer.

With the doors of the refrigerator compartment and the ice compartment opened, press and hold the [2)

冷凍

]

button for 5 seconds or longer again.

Self-diagnosis mode1-2.

Mode input method1)

With the refrigerator compartment door opened 1)
(the temperature control lamp unlit), press and hold the
[

冷蔵室

] button for 5 seconds.

(The buzzer sounds, “beep, beep”.)

Open and close the refrigerator compartment door three 2)
times.

(within 10 seconds after keeping the [

冷蔵室

] button

pressed for 5 seconds)

The buzzer sounds “beep”, and the refrigerator enters the 3)
self-diagnosis mode.

* The self-diagnosis mode will be automatically canceled
when the status with no button operation continues for 3 minutes.

* If the refrigerator does not enter the self-diagnosis mode, a fault with the door switch system can be considered.

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Operation in the self-diagnosis mode2)

The compressor is forcedly turned ON. (Excepting a period of defrosting operation and compressor ON delay •

time)

The cooling, condenser and R-fan motors are forcedly turned ON.•

(These motors will be forcedly turned ON even while the compressor is OFF. However, when the door is opened,
the motors other than the condenser fan motor are kept OFF.)

The refrigerator compartment/vegetable compartment PCI fan and the PCI are forcedly turned ON. (However, •

when the door is opened, the PCI and fan are kept OFF.)

When the refrigerator compartment door is opened, the R damper is forcedly closed. When the refrigerator •
compartment door is closed, the R damper is forcedly opened. (Opening/closing the refrigerator compartment
door activates the R damper operation.)

During execution of the self-diagnosis mode, and for 20 minutes after cancellation of this mode, self-diagnosis •
data serial output is executed.

During execution of the self-diagnosis mode, and for 20 minutes after cancellation of this mode, the door-open •
buzzer does not sound.

Operation during self-diagnosis mode, and self-diagnosis display3)

Self-diagnosis data is displayed on the temperature control panel. (Refer to self-diagnosis display [Table 1].)1)

Self-diagnosis display can be switched by operating the temperature control panel buttons.2)

Temperature control panel button Operation

[

冷凍室

] Fault data forward scroll

[

冷蔵室

] Fault data reverse scroll

[冷凍] Fault occurrence date forward scroll

To return to the previous

display (Reverse scroll)

To proceed to the next display.
(Forward scroll)

Self-diagnosis (fault) display

To change fault occurrence

date to be displayed.

To indicate occurrence date

of displayed fault.

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20

<Example of button operations and self-diagnosis display>

* During self-diagnosis mode input, the “current” fault is displayed.

・
・
・

・
・
・

・
・
・

[During mode input]

“Current” fault

Display of the fault
at the top of Table 1

Press [冷蔵室].
Press [冷凍室].

Press [冷蔵室].
Press [冷凍室].

Display of the fault at
the second top of Table 1

Display of all faults
that have occurred

Press
[冷凍].

Press
[冷凍].

Press
[冷凍].

“Current” fault history

Press
[冷凍].

Press
[冷凍].

Press
[冷凍].

Display of the
latest fault

Display of the
second latest fault

Press [冷蔵室].
Press [冷凍室].

Press [冷蔵室].
Press [冷凍室].

Press [冷蔵室].
Press [冷凍室].

Press [冷蔵室].
Press [冷凍室].

Display of up to 9 items Display of up to 9 items

“1-day before”
fault history

“2-day before”
fault history

Display of the
last fault

Display of the fault just
before the last

“3-days before”
fault history

“4-days before”
fault history

* During forward/reverse scroll of fault display with [

冷凍室

]/[

冷蔵室

] button, if fault data to be displayed next

does not exist, the buzzer sounds “beep-beep”, and the display will not change.

* To display a fault occurrence date for currently displayed data, press the [

冷凍

] lamp.

Fault occurrence date [

冷凍

] lamp.

Current Unlit OFF

Toda y Li t O N

1-day before Blink once. Repeat "2-sec. OFF"/"0.5 -sec. ON/0.5-sec. OFF".

2-days before Blink twice. Repeat "2-sec. OFF"/"0.5-sec. ON/0.5-sec. OFF" twice.

3-days before Blink three times. Repeat "2-sec. OFF"/"0.5 -sec. ON/0.5-sec. OFF" three times.

4-days before Blink four times. Repeat "2-sec. OFF"/"0.5-sec. ON/0.5-sec. OFF" four times.

Example of lamp indication: “2-days before”

0.5-sec. 0.5-sec. 0.5-sec. 0.5-sec. 0.5-sec. 0.5-sec. 0.5-sec. 0.5-sec.

2-sec. pause 2-sec. pause

Repeat

ON

OFF

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Self-diagnosis display [Table 1] 1-3.

(Problems and problem history related to thermistors, auto ice cube maker, inverter,etc.)

－ ○○○○○－－

1

○

2

○

3

○○

5

6

○

○○

○

7

○○○

8

○

9

○○

10

○○

12

○○

14

○○○

15

○○○○

16

○

18 ○○

19

○○○

－

20

○○

－

21

○○○

－

22

○○○

－

23

○○○○

－

24

○○

－

25

○

26

○

27

○○

28

○

29

○○

30

○○

31

○○○

32

－

33

－

Status

No.

ExplanationofStatuses

F-thermistor system problem

R-thermistor system problem

V-thermistor system problem

Def-thermistor system problem

External air temperature
thermistor system problem *

There were two defrosted periods (defrosting
heater on time) that lasted for 120 min.

indicates a problem, indicates the status.

Fan motor g system problem

Ice cube maker problems, wiring,
main pwb problems

Without trouble

Thermistor problems, thermistor
wiring short circuit and open
circuit, main pwb problems

Sensorproblems, sensor wiring
short circuit and open circuit,
main pwb problems

A thermistor input value was short circuit
or open circuit.

A thermistor input value was short circuit
or open circuit.

Thermo. fuse or defrosting heater,
open circuit, main pwb problems

Ice cube maker thermistor
system problem

Defrosting problem

Fan motor f system problem

Fan motor problems, fan lock,
wiring, main pwb problems

Description

Ice cube maker
forward operation error

The ice making position detection switch
was produced abnormal signal

at the time

forward operation.

of ice cube maker

Compressor revolution speed
abnormally low

Water tank out of water

The

Water tank

was out of water.

(Detection with thermistor)

Ice storage box full

The Ice storage box was full of ice cubes.

Lamp indication: Lit =

, Blinking = (0.5-sec. ON/0.5-sec. OFF)

Buzzer: Only when a fault is indicated in the current fault display, the buzzer continuously sounds (0.2-sec. ON/1.8-sec. OFF).

Lamp indication (Temperature control LED)

強

弱中

Refrigerator compartment
PCI fan motor fault

Humidity sensor fault

Refrigerator compartment
PCI power supply fault

Power supply clock fault

Ice cube maker
thermistor high temperature

F-thermistor high temperature

R-thermistor high temperature

R-thermistor low temperature

External air temperature
information

Door open information

Inverter wiring error

Inverter overload protection

Inverter startup fault

Inverter overcurrent

Inverter PWB communication
error

Inverter position detection fault

PCI fault, Wiring disconnection
Main PWB fault

Main PWB fault

Compressor fault
Inverter PWB fault
Protector fault, Wiring fault
Main PWB fault

Detection of abnormal current value during
fan motor ON status

Detection of abnormal current value during
plasmacluster ON status

Detection of power supply clock signal
error in main PWB

Thermistor temperature is “-6ºC or higher”
continuously for 6 hours or longer.

F-thermistor temperature is “0ºC or higher”
continuously for 6 hours or longer.

R-thermistor temperature is “+10ºC or higher”
continuously for 6 hours or longer.

R-thermistor temperature is “lower than damper
closing temperature 5ºC” continuously for 2 hours
or longer.

External air temperature is “40ºC or higher”
continuously three times at external air
temperature data update timing.

Door open status has continued for 15 minutes
or longer, or door opening frequency is 200 times
or more/day.

The inverter microprocessor detected
a compressor wiring error.

The inverter microprocessor detected
compressor overload status.

The inverter microprocessor detected abnormal
drop of compressor rotation speed.

The inverter microprocessor detected
a compressor startup fault.

The inverter microprocessor detected overcurrent
in the compressor drive circuit.

Communication error between main
microprocessor and inverter microprocessor

The inverter microprocessor detected
a compressor motor position error.

* The external air temperature thermistor is located on the operation PWB.

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FORCED STOPPING OF DOOR ALARM BUZZER2.

* Used when the door switch is faulty.

How to stop

While the door-open buzzer sounds, press the [•

冷蔵室

] and [

冷凍室

] buttons simultaneously and hold them for 3

seconds or longer. (The buzzer sounds three times.)

Forced stopping is cancelled automatically 48 hours later.

THERMISTOR CIRCUIT CHECK METHOD3.

A thermistor is a semiconductor for which the resistance value changes as the temperature changes.•

This characteristic is used to allow the temperature to be read by a microcomputer.•

(Temperature Resistance value Changed to voltage.)

Check Method1-1.

Disconnect the connectors and measure the thermistor resistances.•

Determination Method1-2.

If the resistance[1] matches, there is a problem with the electronic circuit board.•

If the resistance[1] is different,there is a problem with the harness, connector, or thermistor.•

[ 1 ]

CN8 ⑫

-

⑬

CN8 ⑭

-

⑮

CN16

③-

①

CN10 ④

-

③

CN8 ④

-

⑤

CN10 ②-③

Humidity sensor

Ice cubemaker thermistor

F-thermistor

DEF thermistor

R-thermistor

V-thermistor

External air temperature
thermistor

Resistance Value

*1

(Ω)

pins pins

pins

pins

pins

pins

pins

Voltage Value (V)

*2

CN15 ⑥-⑤

*1. Disconnect connectors and measure the pins on the wiring side(Ω).

Connector

IC1

+

+5V

[1]

Thermistor

Microcomputer

(A/D)

Table of Thermistor Characteristics1-3.

[1]

- 30.0

- 25.0

- 20.0

- 15.0

- 10.0

- 5.0

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.8

26.1

19.3

14.4

10.9

8.3

6.4

5.0

3.9

3.1

2.5

2.0

1.6

[1]

- 30.0

- 25.0

- 20.0

- 15.0

- 10.0

- 5.0

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.8

26.1

19.3

14.4

10.9

8.3

6.4

5.0

3.9

3.1

2.5

2.0

1.6

[1]

- 30.0

- 25.0

- 20.0

- 15.0

- 10.0

- 5.0

0.0

5.0

10.0

15.0

20.0

25.0

30.0

83.9

61.2

45.2

33.7

25.5

19.5

15.0

11.7

9.2

7.3

5.8

4.7

3.8

- 30.0

- 25.0

- 20.0

- 15.0

- 10.0

- 5.0

0.0

5.0

10.0

15.0

20.0

25.0

30.0

[1]

F-thermistor

R-thermistor
V-thermistor

DEF thermistor Humidity sensor

Ice cube maker

thermistor

External air

temperature thermistor

Temperature

Resistance
value

Temperature

Resistance
value

Temperature

Resistance
value

Temperature

Resistance
value

Voltage
value

(kΩ)

(°C)

(kΩ)

(°C)

(kΩ)

(°C)

(kΩ)

25.4

19.5

15.1

11.8

9.4

7.5

6.0

4.9

4.0

3.3

2.7

2.2

1.9

[1]

Resistance
value

(kΩ)

(°C) (V)

-

-

-

-

-

-

-

-

0
10
20
30
40
50
60
70
80
90

100

-

-

0.1

0.4

0.7

1.0

1.3

1.5

1.8

2.1

33.1

25.6

20.0

15.8

12.5

10.0

8.1

2.4

2.7

3.0

Temperature

(°C)

- 30.0

- 25.0

- 20.0

- 15.0

- 10.0

- 5.0

0.0

5.0

10.0

15.0

20.0

25.0

30.0

Temperature

(°C)