REFRIGERATOR SERVICE MANUAL

REFRIGERATOR

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

MODELS:

LBC22520SB

LBC22520ST

LBC22520SW

LBC22520TT

CONTENTS

SAFETY PRECAUTIONS .....................................................................................................

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

2. PARTS IDENTIFICATION .................................................................................................

4

3. DISASSEMBLY ................................................................................................................

3-1 Refrigerator Door..........................................................................................................

5

5

2

3

3-2 Freezer Door.................................................................................................................

3-3 Fan and Fan Motor........................................................................................................

7

10

3-4 Defrost Control Assembly..............................................................................................

3-5 Lamp.............................................................................................................................

10

10

3-6 Control Box Refrigerator...............................................................................................

11

3-8 Cover Valve...................................................................................................................

4. ADJUSTMENT .................................................................................................................

12

13

4-1 Compressor ................................................................................................................

4-2 PTC-Starter .................................................................................................................

4-3 OLP (overload protector) ............................................................................................

4-4 To remove the cover PTC ...........................................................................................

5. CIRCUIT DIAGRAM .........................................................................................................

13

13

14

14

6. TROUBLESHOOTING ......................................................................................................

6-1 Compressor and electric components ........................................................................

6-2 PTC and OLP ..............................................................................................................

6-3 Other electrical components .......................................................................................

15

16

16

17

18

6-4 Service diagnosis chart ...............................................................................................

6-5 Refrigeration cycle ......................................................................................................

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER ...............................

7.1 Operation principle ......................................................................................................

7.2 Ice maker functions .....................................................................................................

19

20

22

22

7.3 Defect Diagnosis function............................................................................................

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM .................................................

8.1 Function ......................................................................................................................

8.2 PCB function ...............................................................................................................

23

24

25

25

29

8.3 Resistance specification of sensor ..............................................................................

8.4 Troubleshooting............................................................................................................

8.5 Main PWB Assembly and Parts List.............................................................................

8.6 PWB Diagram..............................................................................................................

9. EXPLODED VIEW AND REPLACEMENT PART LIST.....................................................

36

37

39

42

44

SAFETY PRECAUTIONS

Please read the following instructions before servicing your refrigerator.

1.Check the refrigerator for current leakage.

2.To prevent electric shock,unplug before servicing.

3.Always check line voltage and amperage.

4.Use standard electrical components.

5.Don't touch metal products in the freezer with wet hands.This may cause frost bite.

6.Prevent water from spiling on to electric elements or the

Machine parts.

- 2 -

7.Before tilting the refrigerator, remove all materials from on or in the refrigerator.

8.When servicing the evaporator, wear gloves to prevent injuries from the sharp evaporator fins.

9.Service on the refrigerator should be performed by a qualified technician.Sealed system repair must be performed by a CFC certified technician.

1. SPECIFICATIONS

SPECIFICATIONS

Color

Dimensions

Net Weight

Capacity

Refrigerant

Climate class

Rated Rating

Cooling System

Temperature Control

Defrosting System

Insulation

Compressor

Evaporator

Condenser

Lubricanting Oil

Drier

Capillary Tube

First Defrost

Defrost Cycle

Desfrosting Device

Anti-freezing Heater

Case Material

Door Material

Handle Type

Display Graphic

Basket, Quantity

Ice Tray & Bank

Cover, T/V

Tray Drawer-F/L

Lamp

Shelf

Tray meat

Egg Bank

Basket, Quantity

Lamp

Shelf

LBC22520SW

Super White

PCM

LBC22520ST LBC22520SB LBC22520TT

Stainless/Light Noble Gray Black

32.8 (W) x 32.2 (D) x 68.5 (H) in.

125kg

22 cuft

R134a (120g)

Temperate (N)

115V~ / 60Hz

Fan Cooling

MICOM control

Full Automatic

Heater Defrost

Cyclo, Pentane

MC57LAUM PTC Starting Type

Fin Tube Type

Wire Condenser

Polyol Ester ISO 10 220±cc

MOLECULAR SIEVE XH-7

ID Ø0.75

4 Hours

7 - 40 Hours

Heater, Sheath

Water Tank Heater

Embo (normal)

Stainless VCM

Vista

ICE PLUS

2 1/3 + 2 2/3 + 1 full

1B/(1EA)

Optibin Crisper + Humidity Ctl

Yes (Wire)

Yes (2) 40W/Blue

4EA (FIXED)

Yes

No

Plastic (1)

Yes (1) 40W/Blue

Wire

Titanium/Light Noble Gray

VCM

- 3 -

2. PARTS IDENTIFICATION

A

B

C

D

E

F

G

H

I

J

K

L

M

N

Use this section to become more familiar with the parts and features.

NOTE: This guide covers several different models. The refrigerator you have purchased may have some or all of the items listed below. The locations of the features shown below may not match your model.

A

B

C

D

E

Digital Sensor Control

Refrigerator Light

Shelves

Snack Pan

Optibin Crisper

Keeps fruits and vegetable fresh and crisp

F

Ice Trays*

G

Ice Bin

H

Wire Durabase

I

Dairy Bin

J

Design-A-Door

K

Wire Freezer Shelf

L

Refrigerator Door Rack

M

Freezer Light

N

Freezer Door Rack

*on some models

- 4 -

3. DISASSEMBLY

3-1. REFRIGERATOR DOOR

3-1-1. REMOVE REFRIGERATOR DOOR

Before removing the doors, remove the Base Grille.

screwdriver and remove.

Fig. 1

3-1-2. REVERSE REFRIGERATOR DOOR

screwdriver and remove.

Fig. 5

Using 10mm or 13/32-inch socket wrench, remove the 3 bolts and lift off the Top Hinge. Set parts aside.

Using 10mm or 13/32-inch socket wrench, remove the 3 bolts and lift off the Top Hinge. Set parts aside.

Lift up door slightly and remove it. Place door on

a non scratching surface.

Fig. 3

Remove the right upper cap and place it on the left side.

Fig. 7

Hinge Pin

Using a 1/4 socket wrench, loosen and remove

Hinge Pin from the Middle Hinge Bracket. Use a

10mm or 13/32 inch socket wrench to remove the 2 bolts in Middle Hinge Bracket. Remove screw. Set

Middle Hinge Bracket and other parts aside.

Fig. 21

Screw

Middle Hinge

Bracket

Bolts

Middle Hinge Pin

Fig. 4

- 5 -

uncover screw holes and place ir on the right side.

Fig. 8

Lift up door slightly and remove it.

Fig. 9

Hinge Pin

3-1-3. HOW TO REVERSE DOOR HANDLE

NOTE: To assist in installing the handle on the right side, place a small piece of masking tape near the top of the handle before removing.

Grasp the handle tightly with both hands and slide the handle up (this may require some force).

The keyhole slots on the back of the handle allow the handle to separate from the mounting screws.

Turn freezer door upside down on a non-scratch surface and remove the 2 screws and Hinge Pin Insert.

Fig. 10

Hinge Pin

Insert Bracket

Hinge Pin

Insert

Fig. 13

Key hole slots on back of handle

Screws mounted on door

•

Use an adjustable wrench to remove the 2 handle mounting screws.

Remove the 2 screw on the opposite side of the door.

of the bracket. Insert the 2 screws as shown below.

Fig. 11

Using a 1/4 socket wrench, loosen and remove

Hinge Pin from the Middle Hinge Bracket. Use a

10mm or 13/32 inch socket wrench to remove the 2 bolts in Middle Hinge Bracket. Remove screw. Set

Middle Hinge Bracket and other parts aside.


Fig. 14

•

Carefully loosen the plug buttons with your fingers.

The buttons can be unscrewed with your fingers, rotating the pieces counter clockwise, and then the piece will be loose and fall. The buttons were installed little pressure, for this reason the action can be done with your forefinger or thumb finger or with both.

•

Install the plug buttons on the left side.

Plug buttons

Fig. 21

Screw

Middle Hinge

Bracket

Bolts

Middle Hinge

Fig. 15

Fig.12

- 6-

•

Install the handle mounting screws on the

right side.

Fig. 16

Handle Mounting screws

Hold the handle so the masking tape is at the bottom.

Align keyhole slots on the top and bottom of the back of the handle with the screws mounted on the front of the door.

Press the handle against the door front, making sure that the screws go into the keyhole slots.

Grasping the handle with both hands, press it firmly against the front of the door and slide the handle down. This may require some force.

Fig. 17

3-2. FREEZER DOOR

3-2-1. REMOVE FREEZER DOOR

IMPORTANT:

To avoid possible injury, product or property damage, you will need two people to perform the following instructions.

Carefully lift up the door. Remove and place it on a non scratching surface.

Using a 13/32” 10mm socket wrench with

2”extension, loosen the 2 bolts and remove bottom hinge from right side.

Fig. 18

Bottom Hinge Pin

Bottom Hinge

Bracket

Put refrigerator door down over the Hinge

Pin on the Middle Hinge Pin Bracket.

Fig. 19

Keyhole slots on back of handle


Hinge Pin

Line up Top Hinge with holes in top of refrigerator.

Use the 3 bolts to replace the Hinge.

Top Hinge Pin

- 7 -

Tighten Bolts. Force-fit Top Hinge Cover over top

Hinge.

Fig. 21

Change the Hinge Pin from the right side to left side.

Before After

3-2-2 REVERSE FREEZER DOOR

IMPORTANT:

To avoid possible injury, product or

property damage, you will need two people to perform

the following instructions.

Carefully lift up the door. Remove and place it on a non scratching surface.

Using a 13/32” 10mm socket wrench with

2”extension, loosen the 2 bolts and remove bottom hinge from right side.

Fig. 22

Fig. 25

Move the Bottom Hinge to the left side keeping the same orientation and attach 2 bolts.

Fig. 26

With a flat-head screwdriver, carefully pry off and remove the cover over the screw holes on the left side of refrigerator housing.

Fig. 27

Remove the bolt on bottom of refrigerator from the left side and insert it on the right side.

You will need this hole for the Bottom Hinge.

Remove the 2 outer screws from cabinet at area between refrigerator and freezer doors.

(You will need these holes for the Middle Hinge Bracket.)

Fig.28

Fig. 23

Fig. 24

- 8 -

Place screws into outer hole on right side of cabinet.

Attach cover on the right side. Cover is force-filted.

Tighten Bolts. Force-fit Top Hinge Cover over top

Hinge.

Fig.33

Fig. 29

Flip the middle hinge bracket (flange now will be on top) and position on left side of refrigerator and re-attach with two bolts and a phillips screw.

Fig. 30

Replace cover from left side of refrigerator top onto the right of top to cover holes. Cover is also force-fitted.

Put freezer door down over the Bottom Hinge Pin on the Bottom Hinge Bracket.

Attach Middle Hinge Pin.

Put refrigerator door down over the Hinge Pin on the Middle Hinge Pin Bracket.

Fig. 31

Hinge Pin

Line up Top Hinge with holes in top of refrigerator.

Use the 3 bolts to replace the Hinge.

Fig. 32 8 . 1 Fig

Fig. 34

3-2-3. HOW TO REPLACE FREEZER AND

REFRIGERATOR DOORS

Reattach Bottom Hinge attaching the 2 bolts

Reattach Middle Hinge Bracket with two bolts and a phillips screw.

Fig. 21

Screw

Middle Hinge

Bracket

Bolts

Fig. 35

Place freezer door down on Bottom Hinge Pin.

Using a 1/4 socket wrench install Hinge Pin to Middle

Hinge Bracket.

Fig. 21

Middle Hinge

Bracket

Middle Hinge Pin

Fig. 36

Top Hinge Pin

- 9 -

3-3. FAN AND FAN MOTOR

1. Remove the freezer shelf. (If your refrigerator has an icemaker, remove the icemaker first).

2. Remove the plastic guide for slides on left side by unscrewing phillips head screws.

3. Remove the grille by removing one screw and pulling the grille forward.

4. Remove the Fan Motor assembly by loosening 2 screw and disassemble the shroud.

5. Pull out the fan and separate the Fan Motor and Bracket.

3-5. LAMP

FAN MOTOR

Fig. 40

3-5-1. REFRIGERATOR COMPARTMENT LAMP

BRACKET

MOTOR

FAN

1. Unplug the power cord from the outlet.

2. Remove Refrigerator shelves.

3. Release the hooks on both ends of the lamp shield and pull the shield downward to remove it.

4. Turn the lamp counterclockwise.

5. Assemble in reverse order of disassembly.

6. Replacement bulb must be the same specification as the original (Max. 60 W-2EA).

GRILLE

Fig. 37

3-4. DEFROST CONTROL ASSEMBLY

Defrost Control assembly consist of Drefrost Sensor and

FUSE-M.

The Defrost Sensor works to defrost automatically. It is attached to the metal side of the Evaporator and senses its temperature.

Fuse-M is safety device for preventing over-heating of the

Heater when defrosting.

At 72°C, it turns the Defrost Heater off.

1. Pull out the grille assembly. (Figure 46)

2. Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie

Wrap. (Figure 47)

3-5-2. FREEZER COMPARTMENT LAMP

1. Unplug refrigerator or disconnect power.

2. Reach behind light to remove bulb.

3. Replace bulb with a 60W appliance bulb.

4. Plug in refrigerator or reconnect power.

Fig. 41

GRILLE ASSEMBLY

DEFROST-CONTROL

ASSEMBLY

Fig. 38 Fig. 39

- 10 -

3-6. CONTROL BOX-REFRIGERATOR

1. First, remove all shelves in the refrigerator, than remove the

Refrigerator control Box by loosening 2 screws.

CONTROL BOX

COVER LAMP

Fig. 42

2. Remove the Refrigerator Control Box by pulling it downward.

3. Disconnect the lead wire on the right position and separate the lamp sockets.

3-7. MULTI DUCT

1. Remove an upper and lower Cap by using a flat screwdriver, and loosen 2 screws. (Figure 43)

2. Disconnect the lead wire on the botton position.

Fig. 43

- 11 -

3-8. COVER VALVE

3-8-1. DISASSEMBLE

1. Push to inside the cover valve.

3-8-2. ASSEMBLE

1. Insert the cover valve as shown in the picture, push to insert

(may need force).

2. Push to the right and release.

2. Insert hook & b a b a b b

3. Push to the right to insert the cover valve.

4. Turn the cover valve 120° as shown in the picture,

then release it.

4. Then push to inside to assembly.

- 12 -

4. ADJUSTMENT

4-1 COMPRESSOR

4-1-1 Role

The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas. It then delivers the gas to the condenser.

4-1-2 Composition

The compressor includes overload protection. The PTC starter and OLP (overload protector) are attached to the outside of the compressor. Since the compressor is manufactured to tolerances of 1 micron and is hermetically sealed in a dust and moisture-free environment, use extreme caution when repairing it.

4-1-3 Note for Usage

(1) Be careful not to allow over-voltage and over-current.

(2) If compressor is dropped or handled carelessly, poor operation and noise may result.

(3) Use proper electric components appropriate to the

Particular Compressor in your product.

(4) Keep Compressor dry.

If the Compressor gets wet (in the rain or a damp environment) and rust forms in the pin of the Hermetic

Terminal, poor operation and contact may result.

(5) When replacing the Compressor, be careful that dust, humidity, and soldering flux don’t contaminate the inside of the compressor. Dust, humidity, and solder flux contaminate the cylinder and may cause noise, improper operation or even cause it to lock up.

4-2 PTC-STARTER

4-2-1 Composition of PTC-Starter

(1) PTC (Positive Temperature Coefficient) is a no-contact semiconductor starting device which uses ceramic material consisting of BaTiO

3

.

(2) The higher the temperature is, the higher the resistance value. These features are used as a starting device for the Motor.

4-2-2 Role of PTC-Starter

(1) The PTC is attached to the Sealed Compressor and is used for starting the Motor.

(2) The compressor is a single-phase induction motor.

Durign the starting operation, the PTC allows current flow to both the start winding and main winding.

4-2-3 PTC-Applied Circuit Diagram

Starting Method for the Motor

OVERLOAD PROTECTOR

L1

2

PTC

5

S

3

6

N

PTC STARTER

Resistance Starter Capacitor Running

C

COMPRESSOR

MOTOR

M

S

M

C

SEALED

TERMINAL

Fig. 1

4-2-4 Motor Restarting and PTC Cooling

(1) It requires approximately 5 minutes for the pressure to equalize before the compressor can restart.

(2) The PTC device generates heat during operation.

Therefore, it must be allowed to cool before the compressor can restart.

4-2-5 Relation of PTC-Starter and OLP

(1) If the compressor attempts to restart before the PTC device is cooled, the PTC device will allow current to flow only to the main winding.

(2) The OLP will open because of the over current condition. This same process will continue (3 to 5 times) when the compressor attempts to restart until the PTC device has cooled. The correct OLP must be properly attached to prevent damage to the compressor.

Parts may appear physically identical but could have different electrical ratings. Replace parts by part number and model number. Using an incorrect part could result in damage to the product, fire, injury, or possibly death.

4-2-6 Note for Using the PTC-Starter

(1) Be careful not to allow over-voltage and over-current.

(2) Do not drop or handle carelessly.

(3) Keep away from any liquid.

If liquid such as oil or water enters the PTC,

PTC materials may fail due to breakdown of their insulating capabilities.

(4) If the exterior of the PTC is damaged, the resistance value may be altered. This can cause damage to the compressor and result in a no-start or hard-to-start condition.

(5) Always use the PTC designed for the compressor and make sure it is properly attached to the compressor.

Parts may appear physically identical but could have different electrical ratings. Replace parts by part number and model number. Using an incorrect part could result in damage to the product, fire, injury, or possibly death.

- 13 -

4-3 OLP (OVERLOAD PROTECTOR)

4-3-1 Definition of OLP

(1) OLP (OVERLOAD PROTECTOR) is attached to the

Compressor and protects the Motor by opening the circuit to the Motor if the temperature rises and activating the bimetal spring in the OLP.

(2) When high current flows to the Compressor motor, the

Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the current flowing to the Compressor Motor.

4-3-2 Role of the OLP

(1) The OLP is attached to the Sealed Compressor used for the Refrigerator. It prevents the Motor Coil from being started in the Compressor.

(2) For normal operation of the OLP, do not turn the Adjust

Screw of the OLP in any way.

4-4 TO REMOVE THE COVER PTC

(1) Remove the screws on the Cover Back and take it out.

(2) Remove the screw on Cover PTC.

(3) Insert a screwdriver into the Cover PTC hole and

pull it down.

(OVERLOAD PROTECTOR cross section)

Electrical characteristics part number

330 FBYY

12345678

-S1 BOX98

Customer part number

Lot code/ date code

Physical termination part number

1

2

(4) Remove the Cover PTC.

Part

No. Name

Base, phenolic

(UL 94 V-0 rated)

Movable arm support, plated steel.

Stationary contact support, plated steel

Heater support, plated steel

Heater, resistance alloy

Disc, thermostatic alloy

1

Movable arm, spring temper copper alloy

Contact, movable, silver on copper

Contact, stationary, silver on copper

Slug, plated steel

Cover, polyester

(UL 94 V-0 rated)

Pin connector, plated copper alloy

(To engage 2.33/2.66 mm dia. pin)

(5) Remove PTC carefully pulling the edges.

Fig. 2

2

(6) Assembly in reverse order of disassembly.

- 14 -

5. CIRCUIT DIAGRAM

CIRCUIT DIAGRAM

PWB(PCB) ASSEMBLY,DISPLAY

1 2 3 4 5 6 7 8 9

CON101 RD BO BL SB PR BK PK WH YL

C-FAN F-FAN

STEPPING

MOTOR

POWER

SUPPLY

CORD

6 5

CON5

RD BO BL SB

4 3 2 1 11 10

PR BK PK WH

9

CON6

8 7 6 5 4 3

YL

2 1 1

SB BN PR GY WH BL BK YL RD

2

CON4

3 4 5 6 7 8 9 10

CON8

PWB(PCB) ASSEMBLY, MAIN

1

2

3

4

BN

BN

GY

GY

L1

CON1

11 10

SB

9

BN

8 7

YL

6 5

BL

4 3

BL

2 1

BK

SB BN YL BL BL BK

7

CON2

BN

6 5

RD

4 3 2

SB

1

SB

BN RD

SB SB

CON3

1

BN

2 3

BL

BN

BL

CON7

7

8

5

6

1

PK

3

4

2 PK

BO

BO

WH

WH

BL

BL

RT-SENSOR

C

D

R-DOOR

PERCEPTION S/W

A F-DOOR

B

PERCEPTION S/W

DEF-SENSOR

R-SENSOR

F-SENSOR

N

L

GN/YL

(GN)

ICE MAKER PART

BK

GN/YL

(GN)

Cr

PK

RD

V

RD

PWB (PCB) ASSEMBLY, ICE MAKER

M

BL

BL

PTC STARTER

COMP' ACCESSORIES

* ALTERNATIVE COMP' ACCESSORIES

Cr

BK

BL

N

L

*PLUG TYPE, ICE MAKER PART, CAPACITOR PART,

P.T.C START OPTION, DOOR HEATER, RT-SENSOR,

DOOR S/W-R QTY. (1 OR 2), COMP' EARTH PART AND

COMP' ACCESSORIES ON CIRCUIT DIAGRAM ARE SUBJECT

TO CHANGE IN DIFFERENT LOCALITIES AND MODEL TYPE.

PTC

A B

BO

BL

4

3

C D

PR

5

6

BL

4

2

6

5

BL

* P.T.C START OPTION

MC,MQ COMP' EG COMP'

2

3

BK:BLACK

YL:YELLOW

WH:WHITE

PK:PINK

BN:BROWN

GN:GREEN

COMBO KIT(PTC+OLP)

BO:BRIGHT ORANGE

PR:PURPLE

SB:SKY BLUE

GY:GREY

RD:RED

BL:BLUE

- 15 -

6. TROUBLESHOOTING

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

(Rated voltage

± 10%)?

1

Power Source.

Remove PTC-Starter from compressor and measure voltage between Terminal C of compressor and terminal 5 or 6 of PTC.

YES

2

2

Check resistance resistance of

3

Check resistance of

PTC-Starter.

4

Check OLP.

No voltage.

OLP disconnected?

YES

Reconnect.

NO

Check connection condition.

5

Replace OLP.

Applied voltage isn't in acceptable range.

(Voltage ±10%)

Advise customer that power supply needs to be checked by an electrician.

5

The range of resistance is between 1~50 ? (ok)

Check the resistance between M-C, S-C and

M-S in motor compressor.

Open or short

Replace compressor

3 4

Check resistance of two terminals in

PTC-Starter.

4.5~9 W

Replace

PTC-Starter

3

5

4

5

Check resistance of two terminals in OLP.

Not open

Replace

OLP

5

5

Check starting state.

Check the power supply under load.

(Compressor attempting to re-start after being off for 5 minutes).

Supply voltage rating with ±10%.

YES

Did compressor start?

YES

Compressor is OK

NO

Replace the compressor

NO

1

- 16 -

6-2 PTC AND OLP

Normal operation of compressor is impossible or poor.

Separate PTC-Starter from Compressor and measure resistance between No. 5 and 6 of PTC-Starter with a

Tester.

(Figure 1)

Observation value is

115V/60Hz : 6.8

?

±20%

The resistance value is 0

?

(short) or

8 (open).

Replace PTC-

Starter.

Separate OLP from compressor and check resistance value between two terminals of OLP whit a tester.

(Figure 2)

Shows continuity

Open

Check another electric component.

Replace OLP.

6 5

?

Figure 1

Figure 2

- 17 -

6-3 OTHER ELECTRICAL COMPONENTS

• Not cooling at all

Compressor doesn't run

.

Check for open short or incorrect resistance readings in the following components a. Starting devices b. OLP c. Compressor coil d. Wiring harness

Cause

Short, open, or broken.

Poor contact or shorted.

Coil open or shorted.

Poor contact or shorted.

Replace indicated component.

• Poor cooling performance

Compressor runs poorly.

Check starting voltage.

Check voltage at starting devices.

Check current flowing in sub-coil of

Compressor.

Check rating of OLP.

Fan motor doesn't run.

Heavy frost buildup on evaporator

Check wiring circuit.

Check Fan Motor.

Check current flow in the following components:

Sensor

Fuse-M

Check current flow in the defrost heater.

Low voltage.

Poor or broken or open contact.

Shorted.

Lack of capacity.

Wire is open or shorted.

Coil is shorted or open.

Open.

Open.

Advise customer that the power supply needs to be checked by an electrician.




Replace defrost heater.

- 18 -

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT

No Cooling.

Cools poorly.

Foods in the

Refrigerator are frozen.

Condensartion or ice forms inside the unit.

Condensartion forms in the Exterior Case.

There is abnormal noise.

Door does not close well.

POINTS TO BE CHECKED

• Is the power cord unplugged from the outlet?

• Check if the power switch is set to OFF.

• Check if the fuse of the power switch is shorted.

• Measure the voltage of the power outlet.

• Check if the unit is placed too close to the wall.

• Check if the unit is placed too close to the stove, gas cooker, or in direct sunlight.

• Is the ambient temperature too high or the room door closed?

• Check if food put in the refrigerator is hot.

• Did you open the door of the unit too often or check if the door is sealed properly?

• Check if the Control is set to Warm position.

• Is food placed in the cooling air outlet?

• Check if the control is set to colder position.

• Is the ambient temperature below 41°F(5° C)?

• Is liquid food sealed?

• Check if food put in the refrigerator is hot.

• Did you open the door of the unit too often or check if the door is sealed properly?

• Check if the ambient temperature and humidity of the surrounding air are high.

• Is there a gap in the door gasket?

• Is the unit positioned in a firm and even place?

• Are any unnecessary objects placed in the back side of the unit?

• Check if the Tray Drip is not firmly fixed.

• Check if the cover of the compressor enclosure in the front lower side is taken out.

• Check if the door gasket is dirty with an item like juice.

• Is the refrigerator level?

• Is there too much food in the refrigerator?

Ice and foods smell unpleasant.

• Check if the inside of the unit is dirty.

• Are foods with a strong odor unwrapped?

• The unit smells of plastic.

•

Other possible problems:

Check if frost forms in the freezer.

Not defrosting

REMEDY

• Plug into the outlet.

• Set the switch to ON.

• Replace the fuse.

• If the voltage is low, correct the wiring.

• Place the unit about 4 inches (10 cm) from the wall.

• Place the unit away from these heat sources.

• Lower the ambient temperature.

• Put in foods after they have cooled down.

• Don't open the door too often and close it firmly.

• Set the control to Recommended position.

• Place foods in the high-temperature section.

(front part)

• Set the control to Recommended position.

• Set the control to Warm position.

• Seal liquid foods with wrap.

• Put in foods after they have cooled down.

• Don't open the door too often and close it firmly.

• Wipe moisture with a dry cloth. It will disappear in low temperature and humidity.

• Fill up the gap.

• Adjust the Leveling Screw, and position the refrigerator in a firm place.

• Remove the objects.

• Fix the Tray Drip firmly in the original position.

• Place the cover in its original position.

• Clean the door gasket.

• Position in the firm place and level the

Leveling Screw.

• Make sure food stored in shelves does not prevent the door from closing.

• Clean the inside of the unit.

• Wrap foods that have a strong odor.

• New products smell of plastic, but this will go away after 1-2 weeks.

Check Components of the defrosting circuit.

Check the refrigeration system.

The system is faulty.

Perform sealed system repair.

Check the

Thermistor.

The operation of the Thermistor is incorrect.

- 19 -

Replace the

Thermistor.

6-5 REFRIGERATION CYCLE

• Troubleshooting Chart

CAUSE

STATE OF

THE UNIT

STATE OF THE

EVAPORATOR

TEMPERATURE

OF THE

COMPRESSOR

REMARKS

PARTIAL

LEAKAGE

PARTIAL

CLOG

WHOLE

CLOG

MOISTURE

CLOG

Freezer compartment and refrigerator don’t cool normally

COMPLETE

LEAKAGE


Low flowing sound of refrigerant is heard and frost forms in inlet only.

Flowing sound of refrigerant is not heard and frost isn’t formed.

A little higher than ambient temperature.

Equal to ambient temperature.

- Refrigerant level is low due to a

- Normal cooling is possible by

¥

¥

- No discharging of refrigerant.

- Normal cooling is possible by

¥

¥


Freezer compartment and refrigerator don’t cool.

Cooling operation stops periodically.

Flowing sound of refrigerant is heard and frost forms in inlet only.

Flowing sound of refrigerant is not heard and frost isn’t formed.

Equal to ambient temperature.

Flowing sound of refrigerant is not heard and frost melts.


Lower than ambient temperature.

- Normal discharging of the

- The capillary tube is faulty.

- Normal discharging of the

- Cooling operation restarts when

COMPRE-

SSION

Freezer and refrigerator don’t cool.

NO

COMPRE-

SSION

No compressing operation.

Low flowing sound of refrigerant is heard and frost forms in inlet only.


Flowing sound of refrigerant is not heard and there is no frost.

Equal to ambient temperature

- Low pressure at high side of

¥

¥

- No pressure in the high pressure

¥

Leakage Detection

Observe the discharging point of the refrigerant, which may be in the oil discharging part of the compressor and in a hole in the evaporator.

Check if compressor runs.

YES

Check if frost forms in

Evaporator.

No frost or frost forms in inlet only

Check if oil leaks.

Frost formed normally

Moisture Clog

Faulty

Normal amount

Compressor.

Observe the discharged amount of Refrigerant.

None or too much

Inject refrigerant in compressor and check cooling operation.

YES

Check Compressor

Clogged by dust.

Frost formed normally

Gas leakage.

(Find the leak and repair it)

- 20 -

General Control of Refrigerating Cycle

NO.

1

2

3

4

5

6

7

ITEMS

Pipe and piping system opening time

Welding

UNIT

Min.

STANDARDS

Pipe: within 1 hour.

Comp: within 10 minutes.

Drier: within 20 minutes.

Nitrogen pressure

Weld under Nitrogen atmosphere.

(N

2 pressure:

0.1~0.2 kg/cm 2 )

PURPOSES

To protect moisture penetration.

To protect oxide scale formation.

REMARKS

The opening time should be reduced to a half of the standards during rain and rainy seasons (the penetration of water into the pipe is dangerous).

- Refer to repair note in each part.

- R-134a refrigerant is more susceptible to leaks than R-12 and requires more care during welding.

- Do not apply force to pipes before and after welding to protect pipe from cracking.

- In case of evaporator parts, if it doesn't make sound when removing rubber cap, blow dry air or N

2 gas for more than 1 min. and than use the parts.

N

2 sealed parts

Confirm

N

2 leak

Confirm the sound of pressure relief when removing the rubber cap.

Sound: usable

No sound: not usable

Refrigeration

Cycle

Evacuation time

Vacuum degree

Min.

Torr

More than 40 minutes

Below 0.03 (ref)

Drier

Vacuum

Vacuum piping

Pipe coupler

Outlet

(Socket)

Plug

Refrigerant weighing replacement

Leak check

EA

EA

EA

EA

High and low pressure sides are evacuated at the same time for models above 200 l.

Use R-134a manifold exclusively.

Use R-134a manifold exclusively.

R-134a manifold exclusively.

R-134a manifold exclusively.

Use R-134a exclusively.

Weighing allowance: 5g

Note: Winter: -5g

Summer: +5g

- Use R-134a exclusively for

R-134a refrigerator.

- Replace drier whenever repairing refrigerator cycle piping.

- Do not use soapy water for check. It may be sucked into the pipe by a vacuum.

To protect moisture penetration.

To remove moisture.

Note: Only applicable to the model equipped with reverse flow protect plate.

Vacuum efficiency can be improved by operating compressor during evacuation.

To protect mixing of mineral and ester oils.

The rubber pipes for R-12 refrigerant will be melted when they are used for

R-134a refrigerant (causes of leak.)

To protect R-12 refrigerant mixing.



Do not mix with

R-12 refrigerant.

- Do not weigh the refrigerant at too hot or too cold an area.

(77 °F [25°C] is adequate.)

- Make Copper charging canister

(Device filling refrigerant)

Socket: 2SV Plug: 2PV R-134a

Note: Do not burn O-ring (bushing) during welding.

To remove the moisture from pipe inside.

Defect in refrigerant leak area.

- Check for an oil leak at the refrigerant leak area. Use an electronic leak detector if an oil leak is not found.

- The electronic leak detector is very sensitive to halogen gas in the air. It also can detect R-141b in urethane.

Practice many times before using this type of detector to avoid false readings.

- 21

-

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER

7-1 OPERATION PRINCIPLE

7-1-1 Operation Principle of Icemaker

Power On

Start Position

Icemaking

Mode

Harvest

Mode

• Adjusts Ejector to Start Position with power on.

• Waits until water becomes cold after starting the

Icemaking operation.

• Runs MOTOR to drop ice from the tray into the ICE BIN.

Fill

• Performs Icemaking Mode after supplying water by operating

the SOLENOID in ICE VALVE.

• With the detect lever, checks if the ICE BIN is full.

Park Position

Test Mode

• To operate LINE and SERVICE, press and hold the Cube Size button

for 3 seconds. The icemaking will run through 3 stages:

Harvest Fill Icemaking.

1. Turning the Icemaker stop switch off (O) stops the icemaking function.

2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control.

Cube Size button

- 22

-

Power (On/Off) Switch

7-2 ICE MAKER FUNCTIONS

7-2-1 Ice Making Mode

1. Icemaking refers to the freezing of supplied water in the ice trays. Complete freezing is assured by measuring the temperature of the Tray with icemaking SENSOR.

2. Icemaking starts after completion of the water fill operation.

3. The icemaking function is completed when the sensor reaches -7°C, 60 to 240 minutes after starting.

NOTE : After icemaker power is ON, the icemaker heater will be on for test for 9 sec.

7-2-2 Harvest Mode

1. Harvest (Ice removing) refers to the operation of dropping ices into the ice bin from the tray when icemaking has completed.

2. Harvest mode:

(1) The Heater is ON for 30 seconds, then the motor starts.

(2) Harvest mode is completed if it reaches start position again while Heater & Motor are on at the same time.

A. ice bin is full : The EJECTOR stops (heater off).

B. ice bin is not full : The EJECTOR rotates twice to open for ice.

NOTE : If the EJECTOR does not rotate once within 5 minutes in status (2), separate heater control mode starts operating to prevent the EJECTOR from being constrained. (It is recommended that the user open for ice to return to normal mode.)

7-2-3 Fill/Park Position

1. Once a normal harvest mode has been completed, the water solenoid will be activated.

2. The amount of water is adjusted by pressing the fill key repeatedly. This changes the time allowed for fill as illustrated in the table below.

Water supply amount table

STAGE TIME TO SUPPLY

1 6 sec.

INDICATIONS REMARKS

2 7 sec.

The water amount will vary depending on the water control switch setting, as well as the water pressure of the connected water line.

3 8 sec.

- 23 -

7-2-4 Function TEST

1. This is a compulsory operation for test, service, cleaning, etc. It is operated by pressing and holding the Cube Size button

for 3 seconds.

2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. (If there is an ERROR, it can only be checked in the TEST mode.)

3. Caution! If the test is performed before water in the icemaker is frozen, the ejector will pass through the water. When the fill mode begins (Stage 4), unless the water supply has been shut off, added water will overflow into the ice bin. If the control

Doesn’t operate normally in the TEST mode, check and repair as needed.

4. After water is supplied, the normal CYCLE is followed:

icemaking Harvest Fill

Park Position.

5. Five seconds after Stage 5 is completed, the icemaker returns to MICOM control. The time needed to supply water resets to the pre- test setting.

Diagnosis TABLE

STAGE ITEMS INDICATOR

1

2

HEATER

MOTOR

REMARKS

Five seconds after heater starts, heater will go off if temperature recorded by sensor is

10°C (50°F)or lever is in up position.

Five seconds after heater starts, you can confirm that motor is moving.

You can confirm Hall IC detection of position.

3

HALL IC

(TRAY)

4

SOLENOID VALVE

Two seconds after detection of initial position, you can confirm that valve is on.

5

HALL IC

(LEVER)

You can check when the Hall IC is sensing a full

ice condition. (If there is a water fill error, the fifth LED is not on.)

Five seconds after fifth stage is completed, the icemaker resets to initial status.

6

Reset

Return to Status prior to

TEST MODE

7-3 DEFECT DIAGNOSIS FUNCTION

7-3-1 ERROR CODES shown on Ice Maker water supply control panel

NO

1

DIVISION

Normal

INDICATOR

Note fill times

(see previous page)

PROBLEM

None

2

Icemaking

Sensor malfunction

Open or shorted wire or sensor

3

Icemaker Kit malfunction

Ejector blades have not reached the park position after 18 minutes from start of harvest mode

*

ERROR indicators in table can be checked only in TEST mode.

- 24

-

REMARKS

Display switch operates properly

Make sure that the wire on each sensor is connected.

Check

HALL IC/MOTOR/

HEATER/RELAY

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

8-1 FUNCTION

8-1-1 Function

1. When the appliance is plugged in, it is set to “4” for Refrigerator and “4” for freezer.

You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button,

2. When the power is initially applied or restored after a power failure, it is automatically set to “4” & “4”.

ADJUST

WARMER

REFRIGERATOR TEMP

4 IS RECOMMENDED

COLDER

WARMER

FREEZER TEMP


COLDER

ADJUST

8-1-2 Control of freezer fan motor

1. Freezer fan motor has high and standard RPMs.

2. High RPM is used when electricity is first on, for ICE PLUS, and when refrigerator is overloaded.

But standard RPM is used for general purposes.

3. To improve cooling speed and load corresponding speed, the RPM of freezer fan motor shall change from normal speed to high speed.

4. High speed (2500RPM): initial power on or load corresponding operation, ICE PLUS.

Normal speed (2200 RPM): general working conditions.

5. Fan motor is stopped when Refrigerator Door is opened.

6. The fan motor is stopped when Freezer Door is opened (only if compressor status is OFF)

8-1-3 Ice Plus

1. The purpose of this funstion is to intensify the cooling speed of freezer and to increase the amount of ice.

2. Whenever selection switch is pressed, selection/release, the LED will turn ON or OFF.

3. If there is a power cut and the refrigerator is power on again, ICE PLUS function will be canceled.

4. To activate these function you need to press the ICE PLUS key and the LED will turn ON. This function will remain activated for 24 hrs. The first three hours the compressor and ICE PLUS will be ON. The next 21 hours the freezer will be controlled at the lowest temperature. After 24 hours or if the ICE PLUS key is pressed again, the freezer will return to its previous temperature.

5. For the first three hours notice the following cases:

(1) Compressor and freezer fan (HIGH RPM) continuously operate for three hours.

(2) If defrost starts during ICE PLUS, ICE PLUS operates for the rest of time after defrost is completed, when ICE PLUS operation time is less than 90 minutes.

(3) If ICE PLUS is pressed during defrost, ICE PLUS LED is on but this function will start seven minutes after defrost is completed and it shall operate for three hours.

(4) If ICE PLUS is selected within seven minutes after compressor has stopped, the compressor (compressor delays seven minutes) shall start after the balance of the delay time.

(5) The fan motor in the freezer cmpartment rotates at high speed during ICE PLUS.

For the rest of 21 hours, the freezer will be controlled at the lowest temperature.

8-1-4 Refrigerator Lamp Auto OFF

To protect the risk of lamp heat, when Refrigerator door opens for 7 min., Refrigerator lamp is auto off.

- 25 -

8-1-5 Alarm for Open Door

1. This feature sounds a buzzer when the freezer or refrigerator door is not closed within 1 minute after it is opened.

2. One minute after the door is opened, the buzzer sounds three times each for ½ seconds. These tones repeat every 30 seconds.

3. The alarm is cancelled when the freezer or the refrigerator is closed while the buzzer sounds.

Freezer Door or Refrigerator

Door

Closed Open Closed Open

3 Times 3 Times 3 Times 3 Times

Closed

Buzzer

Within 1 min.

1 min.

30 sec 30 sec 30 sec

8-1-6 Buzzer Sound

When the button on the front Display is pushed, a Ding~ Dong~ sound is produced.

8-1-7 Defrosting (removing frost)

1. Defrosting starts each time the accumulated COMPRESSOR running time is between 7:30 and 40 hours. This time is determined by how often and how long the doors are opened.

2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours.

3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn’t reach 46.4°F(8°C) in

1 hours, the defrost mode is malfunctioning.

4. Defrosting won

’ t function if its sensor is defective (wires are cut or short circuited)

8-1-8 Electrical Parts Are Turned On Sequentially

Electrical parts such as COMP, defrosting heater, freezer FAN, etc. are turned on in the following order to prevent noise and parts damage. Several parts are started at the same time at initial power on and are turned off together when TEST is completed.

OPERATING

Temperature of Defrosting

(when unit is newly purchased or when moved)

POWER

ON

In ½ second

COMP

ON

ORDERS

Freezer FAN

ON

Cooling FAN

ON

Temperature of defrosting

(when power cuts, SERVICE)

POWER

ON

In ½ second

Defrosting heater ON

In 10 second

Defrosting heater OFF

In ½ second

COMP

ON

In ½ second

Freezer FAN

ON

In ½ second

Cooling FAN

ON

Reset to normal operation from TEST MODE

Total Load

OFF

In 7 minute

COMP

ON

- 26 -

Freezer FAN

ON

In ½ second

Cooling FAN

ON

8-1-9 Defect Diagnosis Function

1. Automatic diagnosis makes servicing the refrigerator easy.

2. When a defect occurs, the buttons will not operate; but the tones. such as ding. will sound.

3. When defect is repaired the defect code is removed and refrigerator returns to normal operation (RESET)

4. The Defect code is shown on the Display.

ADJUST

WARMER

REFRIGERATOR TEMP


COLDER WARMER

FREEZER TEMP


COLDER

ADJUST

ERROR CODE on display panel

NO

1

2

3

ITEM

Failure of freezer sensor

Failure of defrost sensor

All off

Failure of

Refrigerator sensor

All off

All off

LED OFF LED ON

ERROR CODE

4 Poor of defrost All off

5

Failure of BLDC fan motor at freezing compartment

All off

CONTENTS REMARKS

Cut or short circuit wire


Inspect Connecting wires on each sensor


1 hours later after starting defrost, If sensor doesn’t be over 46ºF (8ºC)

Snapping of defrost heater or Temperature fuse, pull-out of

Connector (indicated minimum 1 Hours after failure occurs)

115sec in operation

Poor motor, hocking to

If there is no fan motor signal for more than

wires of fan, contact of structures to fan, snapping or short of lead

- 27 -

8-1-10 TEST Mode

1. The Test mode allows checking the PCB and the function of the product as well as finding out the defective part in case of an error.

2. The test mode is operated by pressing two buttons at Display panel.

3. While in the test mode, the function control button is not recognized, but the recognition tone (beep~) sounds.

4. After exiting the test mode, be sure to reset by unplugging and then plugging in the appliance.

5. If an error, such as a sensor failure, is detected in the test mode, the test mode is cleared and the error code is displayed.

6. While an error code is displayed, the test mode will not be activated.

MANIPULATION MODE

TEST1

CONTENTS REMARKS

COMPRESSOR

2.Continuous operation of the freezer fan

3.Stepping DAMPER OPEN

4.Defrosting Heater OFF

Reset after 5 minutes

5.Every DISPLAY LED ON

TEST2

1.COMP OFF

2.Freezer FAN OFF

3.Stepping DAMPER CLOSE

Reset if the temperature

4.Defrosting Heater ON of the defrosting sensor

5.DISPLAY LED 1,3,5,7 ON

Reset

Push ICEPLUS key and temperature at the same time over 3 seconds being in TEST MODE2. Or press

TEST S/W one time being in TEST MODE 2.

Reset to the previously setting before

TEST MODE

The Compressor will

Delay

NOTE : LED CHECK MODE: When the refrigerator temperature control and the freezer temperature control button at the same time are hold for 1 second or longer, every LED on the display turns on at the same time. when the button are relesed, the previous mode is restored.

* Freezer Fan RPM Variable Check:

In case the freezer fan is in operation when the ADJUST key in Refrigerator and Freezer Temp. Control are pressed for more than one second at the same time freezer fan RPM changes. (For example if high speed, to normal speed or if normal speed, to high speed for 30 seconds)

After 30 seconds, it turns to its original RPM.

*Demonstration MODE;

1. When the ICE PLUS key and ADJUST key of refrigerator temperature control are pressed for more than 3 seconds at the same time temperature´s it converts to demonstration mode.

2. In this status, each LED is rotated with 1 second interval.

3. In this status, all loads are off (Compressor / Fan / Damper / Heater)

(Even is Demonstration Mode, the refrigerator Lamp automatic off function works normally and can be demonstrated)

4. It reset if you do again as clause.

- 28 -

8-2 PCB FUNCTION

8-2-1 Power Circuit

The secondary part of the TRANSFORMER is composed of the power supply for the display, the BLDC FAN Motor drive

(15.5 V), the relay drive (12 Vdc) and the MICOM and IC (5 Vdc).

The voltage for each part is as follows:

PART

VOLTAGE

VA 1

115 Vac

CE 3

12 Vdc

CE 4

15.5 Vdc

CE 5

5 V

VA1 is a part for preventing over voltage and noise. When 385V or higher power is applied, the inside elements are shortcircuited and broken, resulting in blowout of the fuse in order to protect the elements of the secondary part of the

TRANSFORMER.

- 29 -

8-2-2 Oscillation Circuit

This circuit generates the base clock for calculating time and the synchro clock for transmitting data from and to the inside logic elements of the IC1 (MICOM). Be sure to use specific replacement parts, since calculating time by the IC1 may be changed. If changed, the OSC1 SPEC will not work.

8-2-3 Reset Circuit

The RESET circuit allows all the functions to start at the initial conditions by initializing various parts, including the RAM inside the MICOM (IC1) when the power is initially supplied or the power supply to the MICOM is restored after a momentary power failure. For the initial 10ms of power supply, LOW voltage is applied to the MICOM RESET terminal.

During a normal operation, 5V is applied to the RESET terminal. (If a malfunction occurs in the RESET IC, the MICOM will not operate.)

- 30 -

8-2-4 Load / Buzzer Drive & Open Door Detection Circuit

1. Load Drive Condition Check

LOAD TYPE

Measurement Location (IC6)

ON

Condition

OFF

COMP

NO.14

DEFROSTING

HEATER

NO.12

LAMP

NO.11

1V or below

12V

TCM

POWER MODE

(OPTIONAL)

NO.12

2. Fan motor driving circuit (freezing compartment fan)

1. This circuit makes standby power 0 by cutting off power supplied to ISs inside of the fan motor in the fan motor OFF.

2. This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7.5V ~ 16V to motor

3. This circuit prevents over-driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor.

MOTOR OFF

MOTOR ON a part

2V or less

13V~15V b part

0V

0V c part

5V

2V~3V

- 31 -

3. Cooling motor driving circuit (machine room)

1. This circuit makes standby power 0 by cutting off power supplied to Iss inside of the fan motor in the fan motor OFF.

2. This circuir prevents over-driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor.

MOTOR OFF

MOTOR ON a Part

2V or less

13V - 15V b Part

0V

0V

4. Buzzer Drive Condition Check

Condition

Measurement Location

Tone (Ding~Dong~) when the button on the display is pushed.

0.05 s 0.2 s 0.1 s 2 s

5 V

0 V

5 V

0 V

2.63 kz (Ding~) 2.21 kz (Dong~)

- 32 -

Alarm for open door

(beep-beep-beep)

0.5 s 0.5 s

5 V

0 V

5 V

0 V

2.63 kz (Beep~) OFF

OFF

0 V

0 V

5. Open Door Detection Circuit Check

REFRIGERATOR DOOR

SWITCH

FREEZER DOOR

SWITCH

Freezer/

Measurement

Location

Refrigerator Door

Closed

Open

8-2-5 Temperature Sensor Circuit

(PIN NO.15 & PIN NO.14)

5 V

0 V

FREEZER-SENSOR

REFRIGERATOR-SENSOR

DEFROST-SENSOR

The upper CIRCUIT reads REFRIGERATOR temperature, FREEZER Temperature, and DEFROST-SENSOR temperature for defrosting and the indoor temperature for compensating for the surrounding temperature into MICOM.

OPENING or SHORT state of each TEMPERATURE SENSOR are as follows:

CHECK POINT NORMAL (-30°C ~ 50°C) SHORT-CIRCUITED OPEN SENSOR

Freezer Sensor

Refrigerator Sensor

Defrosting Sensor

0.5 V ~ 4.5 V 0 V 5 V

- 33 -

8-2-6 Refrigeration Compartment Stepping Motor Damper Circuit

* The circuit shown below is the damper circuit to regulate the refrigerator temperature.

8-2-7 Temperature Compensation & Overcooling/Undercooling Compensation Circuit

1. Refrigerator Temperature Compensation

Table of Refrigerator temperature compensation.

OPTION

JCR1

JCR2

JCR3

JCR4

CUTTING

R+ 1.0 deg compensation

R+ 1.0 deg compensation

R- 1.0 deg compensation

R- 1.0 deg compensation

REMARK

Warmer

Colder

- 34 -

8-2-8 Key Button Input & Display Light-On Circuit

? The circuit shown above determines whether a function control key on the operation display is pushed. It also turns on the

MODULE). The drive type is the scan type

8-2-9 Power Failure Compensation Circuit (DISPENSER MODEL)

- 35 -

8-3 RESISTANCE SPECIFICATION OF SENSOR

TEMPERATURE DETECTED

BY SENSOR

-20°C

-15°C

-10°C

-5°C

0°C

+5°C

+10°C

+15°C

+20°C

+25°C

+30°C

+40°C

+50°C

RESISTANCE OF FREEZER

SENSOR

22.3K

16.9K

13.0K

10.1K

7.8K

6.2K

4.9K

3.9K

3.1K

2.5K

2.0K

1.4K

0.8K

RESISTANCE OF REFRIGERATOR &

DEFROST SENSOR & ROOM SENSOR

77K

19.5K

15.9K

13K

11K

8.9K

6.2K

4.3K

60K

47.3K

38.4K

30K

24.1K

- The resistance of the SENSOR has a ±5% common diference.

- Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature.

This delay is necessary due to sensor response speed.

- 36 -

- 37 -

- 38 -

8-5 MAIN PWB ASSEMBLY AND PARTS LIST

8-5-1 Main PWB Assembly

- 39 -

8-5-2 Replacement Parts List

- 40 -

8-5-3 PWB Assembly, Display and Parts List

- 41 -

8-6 PWB DIAGRAM

8-6-1 PWB Main Assembly

- 42 -

- 43 -

#EV#

10. EXPLODED VIEW

CASE PARTS

CAUTION: Use the part number to order part, not the position number.

103A

281A

B01

281B

103B

406B

501F

282E

410A

409D

503G

503F

619B

411A

501A

903D

610A

503D

503C

409B

304A

145B

125D*

S38

282H

128F

328A

105A

318A

317A

314A

419B

327A

410G

310A

308A

307B

307A

312A

309A

412D

405B

420A

405B

329C

319A

323B

106A

319C

903E

610A

305B

305C

315A

158E

405A

S22

158A

B01

282B

S01

301A

106B

128E

283B

282C

409B

283D

106A

284D

418A

503E

120B

282F

401A

145A

405G

319E

405F

404A

405C

329A

332A

903B

105F

903A

305C

305B

135C

903B

103C

- 44 -

#EV#

FREEZER PARTS


131A

149A

136C

- 45 -

#EV#

REFRIGERATOR PARTS


S24

140E

140B

143E

140D

S24

S24

140E

140B

143E

140D

S24

S24

128B

142E

143F

140B

142D

S24

128A

170A

140E

140B

143E

140D

S24

103E

S24

103E

151A

167B

155B

154A

151A

151C

- 46 -

#EV#

DOOR PARTS


241A

233A

241B

230A

231A

286A

212G

241C

241E

244E

244A

241D

205D

S27

243A

286A

203A

200A

201A

281E

212A

286A

243A

283F

S27

- 47 -

#EV#

WATER & ICE MAKER PARTS


602A

600C

S28

600A

- 48 -

622B

618A

616E

627A

623C

S29

619C

262D

619A

S31

MFL62526004 September, 2009

No results