LG LRDC22744, LRDC22724, LRDC22712, LRDC22734 Service Manual

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Page 1

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

REFRIGERATOR

SERVICE MANUAL

MODEL:

LRDC22734**

LRDN22712**

LRDN20724**

LRDC22744**

Page 2

CONTENTS

DESCRIPTION OF FUNCTION & CICUIT OF MICOM (GOOD, BETTER) ..................................................................... 45-64

REFRIGERATOR EXPLODED VIEW & SERVICE PARTS LIST.......................................................................................65-102

SAFETY PRECAUTIONS ....................................................................................................................................................... 2

SPECIFICATIONS................................................................................................................................................................... 3

PARTS IDENTIFICATION.................................................................................................................................................... 4-7

DISASSEMBLY.................................................................................................................................................................... 8-9

DOOR................................................................................................................................................................................... 8

DOOR SWITCH.................................................................................................................................................................... 8

FAN AND FAN MOTOR........................................................................................................................................................ 9

DEFROST CONTROL ASSEMBLY...................................................................................................................................... 9

LAMP.................................................................................................................................................................................... 9

CONTROL BOX-REFRIGERATOR...................................................................................................................................... 9

MULTI DUCT ........................................................................................................................................................................ 9

ADJUSTMENT.................................................................................................................................................................. 10-11

COMPRESSOR.................................................................................................................................................................. 10

PTC-STARTER.................................................................................................................................................................. 10

OLP (OVERLOAD PROTECTOR)....................................................................................................................................... 11

TO REMOVE THE COVER PTC..........................................................................................................................................11

CIRCUIT DIAGRAM.......................................................................................................................................................... 12-13

TROUBLESHOOTING...................................................................................................................................................... 14-19

COMPRESSOR AND ELECTRIC COMPONENTS ........................................................................................................... 14

PTC AND OLP.................................................................................................................................................................... 15

OTHER ELECTRICAL COMPONENTS............................................................................................................................. 16

SERVICE DIAGNOSIS CHART.......................................................................................................................................... 17

REFRIGERATION CYCLE ............................................................................................................................................ 18-19

OPERATION PRINCIPLE & REPAIR METHOD OF ICEMAKER .................................................................................. 20-23

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM (BEST, DISPENSER) ............................................................. 24-44

SAFETY PRECAUTIONS

Please read the following instructions before servicing your refrigerator.

1. Check the refrigerator for electrical faults.

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 frostbite or cause your skin to freeze and stick to the surfaces inside the freezer.

6. Prevent water from flowing onto electric elements in the mechanical parts.

7. Close the top door before opening the bottom door. Otherwise, you might hit your head when you stand up.

8. When tilting the refrigerator, remove any materials on the refrigerator, especially the glass shelves and stored foods.

9. When servicing the evaporator, wear cotton gloves. This is to prevent injuries from the sharp evaporator fins.

10. Disassembly, repair, and servicing the sealed refrigeration system should be performed only by qualified and certified personnel. Refrigerant should not be vented into the atmosphere; proper recovery equipment should be used.

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Page 3

1. SPECIFICATIONS

20 cu. ft. / 22 cu. ft.

ITEMS SPECIFICATIONS

DOOR DESIGN Side Rounded

29 7/

8 X 31

DIMENSIONS (inches)

NET WEIGHT (pounds)

COOLING SYSTEM Fan Cooling

TEMPERATURE CONTROL Micom Control

DEFROSTING SYSTEM

DOOR FINISH Embossed Metal, VCM, Stainless

HANDLE TYPE Bar, Al

INNER CASE ABS Resin

INSULATION Polyurethane Foam

32 7/8 X 31 3/4 X 69 1/2 (WX

32 7/8 X 31 3/4 X 68 1/2 (WX

238.4 (

246.9 (

Full Automatic

Heater Defrost

4 X 67

20cu.ft)

22cu.ft)

8 (WXDXH) 20cu.ft

DXH) 22cu.ft Dispenser

DXH) 22cu.ft

ITEMS SPECIFICATIONS

VEGETABLE TRAY Opaque Drawer Type

COMPRESSOR PTC Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Wire Condenser

REFRIGERANT R-134a (115 g)

LUBRICATING OIL Freol @ 10G (310 cc)

DEFROSTING DEVICE SHEATH HEATER

REFRIGERATOR 60 W (2EA)

LAMP

FREEZER 60 W (2EA)

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Page 4

2. PARTS IDENTIFICATION

- 4 -

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.

Digital Sensor Control

Refrigerator Light

Shelves

Chef Fresh / Snack Pan*

Can Dispenser*

Optibin Crisper Keeps fruits and vegetable fresh and crisper

Customcube Icemaker

Ice Bin

Durabase

Divider

Filter (inside)*

Dairy Bin

Design-A-Door

Egg Box

Refrigerator Door Rack

Freezer Light

Wire Basket

Freezer Door Rack (Tilting*)

*on some models

Page 5

PARTS AND FEATURES

- 5 -

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.

Digital Sensor Control

Refrigerator Light

Shelves

Chef Fresh / Snack Pan*

Can Dispenser*

Optibin Crisper Keeps fruits and vegetable fresh and crisper

Triple Ice Tray

Ice Bin

Durabase

Divider

Filter (inside)*

Dairy Bin

Design-A-Door

Egg Box

Refrigerator Door Rack

Freezer Light

Wire Basket

Freezer Door Rack (Tilting*)

*on some models

Page 6

PARTS AND FEATURES

- 6 -

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.

Divider

Dairy Bin

Design-A-Door

Egg Box

Refrigerator Door Rack

Freezer Light

Wire Basket

Freezer Wire Door Rack

Digital Sensor Control

A B

Refrigerator Light

Shelves

Snack Pan

Optibin Crisper Keeps fruits and vegetable fresh and crisp

Triple Twist Ice Tray

Ice Bin

Wire Durabase

Page 7

PARTS AND FEATURES

- 7 -

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.

Dairy Bin

Design-A-Door

Wire Freezer Shelf

Refrigerator Door Rack

Freezer Light

Freezer Door Rack

Digital Sensor Control

A B

Refrigerator Light

Shelves

Snack Pan

Optibin Crisper Keeps fruits and vegetable fresh and crisp

Ice Trays

Ice Bin

Wire Durabase

Page 8

3. DISASSEMBLY

BOLT

HINGE

HINGE COVER

GASKET

LOWER HINGE

BOLT

DOOR SWITCH

LEAD WIRE

3-1 DOOR

● Refrigerator Door

1. Remove the hinge cover by pulling it upwards.

2. Loosen the hexagonal bolts attaching the upper hinge to the body and lift the freezer door.

Figure 1

3. Pull out the door gasket to remove from the door foam assembly.

● Freezer Door

1. Loosen the hexagonal bolts attaching the lower hinge to the body to remove the refrigerator door only.

Figure 3

2. Pull out the door gasket to remove from the door foam assembly.

3-2 DOOR SWITCH

1. To remove the door switch, pry it out with a slotted-type driver, as shown in (Figure 4).

2. Disconnect the lead wire from the switch.

Figure 2

Figure 4

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Page 9

3-3 FAN AND FAN MOTOR

FAN

BRACKET

MOTOR

GRILLE

FAN MOTOR

GRILLE ASSEMBLY

DEFROST-CONTROL ASSEMBLY

CONTROL BOX

COVER LAMP

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

2. Remove the grille by pulling it out and by loosening a screw.

3. Remove the Fan Motor assembly by loosening 2 screws and disassemble the shroud.

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

Figure 5

3-4 DEFROST CONTROL ASSEMBLY

Defrost Control assembly consists of Defrost 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. At 72°C, it turns the Defrost Heater off.

Fuse-M is a safety device for preventing over-heating of the Heater when defrosting.

1. Pull out the grille assembly. (Figure 6)

2. Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap. (Figure 7)

3-5-1 Refrigerator Compartment Lamp

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

Figure 9

3-5-2 Freezer Compartment Lamp

1. Unplug refrigerator or disconnect power.

2. Reach behind light shield to remove bulb.

3. Replace bulb with a 60-watt appliance bulb.

4. Plug in refrigerator or reconnect power.

3-6 CONTROL BOX-REFRIGERATOR

1. First, remove all shelves in the refrigerator, than remove the Refrigerator control Box by loosening 2 screws.

Figure 10

3-5 LAMP

Figure 6

Figure 7

Figure 8

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 3 screws. (Figure 11)

2. Disconnect the lead wire on the bottom position.

Figure 11

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Page 10

4. ADJUSTMENT

PTC STARTER

SEALED TERMINAL

COMPRESSOR MOTOR

PTC

OVERLOAD PROTECTOR

Resistance Starter Capacitor Running

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

(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

Figure 12

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.

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Page 11

4-3 OLP (OVERLOAD PROTECTOR)

Part

Customer part number

Lot code/ date code

330 FBYY -S1 BOX98

12345678

Physical termination part number

Electrical

characteristics

part number

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 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) Quick-connect terminal, brass, conforms to UL 310, MEMA DC-2, DIN 46344

(OVERLOAD PROTECTOR cross section)

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 Cover Back M/C.

(2) Remove the screw on Cover PTC.

Figure 13

(3) Remove two Housings on upper part of Cover PTC.

(4) Take out the cover PTC from upper to lower position

like .

(5) Turn 45° in the direction of  and take it out.

(6) Assembly in reverse order of disassembly.

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Page 12

5. CIRCUIT DIAGRAM

- 12 -

Best / Best dispenser

GY: GRIS/GRAY

Page 13

Good / Better

- 13 -

GY: GRIS/GRAY

Page 14

6. TROUBLESHOOTING

YES

The range of resistance is between 1~50Ω (OK)

Not open

4.5~9 Ω

Open

Open or short

YES

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

Power Source.

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

No Voltage.

Applied voltage isn't in range of Rating Voltage ±10%.

(Reated Voltage ±10%)?

OLP disconnected?

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

Replace OLP.

Check connection condition.

Reconnect.

Check resistance of Motor Compressor.

Check resistance of PTC-Starter.

Check resistance between M-C, S-C and M-S in Motor Compressor.

Check resistance of two terminals in PTC-Starter.

Replace Compressor.

Replace PTC-Starter.

Check OLP.

Check starting state.

Check resistance of two terminals in OLP.

Check the power supply under load. (Compressor attempting to re-start after being off for 5 minutes).

Supply voltage rating with ±10%.

Replace OLP.

Did compressor start?

Compressor is OK

Replace the compressor

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Page 15

6-2 PTC AND OLP

Shows continuity

Open

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 14)

Separate OLP from Compressor and check resistance value between two terminals of OLP with a Tester. (Figure 15)

Observation value is 115V/60Hz : 6.8Ω±30%

The resistance value is 0Ω (short) or ∞ (open).

Check another electric component.

Replace OLP.

Replace PTCStarter.

Figure 14

Figure 15

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Page 16

6-3 OTHER ELECTRICAL COMPONENTS

▼ Not cooling at all

Compressor doesn't run.

▼ Poor cooling performance

Compressor runs poorly.

Check for open short or incorrect resistance readings in the following components

a. Starting devices

b. OLP

c. Compressor coil

d. Wiring harness

Check starting voltage.

Check voltage at starting devices.

Cause

Short, open, or broken.

Poor contact or shorted.

Coil open or shorted.

Poor contact or shorted.

Low voltage.

Poor or broken or open contact.

Replace indicated component.

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

Replace indicated component.

Fan motor doesn't run.

Heavy frost buildup on EVAPORATOR.

Check current flowing in sub-coil of Compressor.

Check rating of OLP.

Check wiring circuit.

Check Fan Motor.

Check current flow in the following components: Sensor Fuse-M

Check current flow in the Defrost Heater.

Shorted.

Lack of capacity.

Wire is open or shorted.

Coil is shorted or open.

Open.

Replace indicated component.

Replace Defrost Heater.

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Page 17

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT POINTS TO BE CHECKED REMEDY

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.

• 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 Drip Tray is not firmly fixed.

• Check if the cover of the compressor enclosure

in the lower front side is taken out.

• 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 Drip Tray firmly in the original position.

• Place the cover in its original position.

Door does not close well.

Ice and foods smell unpleasant.

● Other possible problems:

Check if frost forms in the freezer.

Check the refrigeration system.

Check the Thermistor.

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

• Is the refrigerator level?

• Is there too much food in the refrigerator?

• Check if the inside of the unit is dirty.

• Are foods with a strong odor unwrapped?

• The unit smells of plastic.

Not defrosting

The system is faulty.

The operation of the Thermistor is incorrect.

• 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.

Perform sealed system repair.

Replace the Thermistor.

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Page 18

6-5 REFRIGERATION CYCLE

YES

▼ Troubleshooting Chart

CAUSE

PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard and than ambient • to a leak.

LEAKAGE

COMPLETE Freezer Flowing sound of refrigerant Equal to ambient • No discharging of Refrigerant. LEAKAGE compartment and is not heard and frost isn't temperature. • Normal cooling is possible by

CLOGGED BY DUST

PARTIAL Freezer Flowing sound of refrigerant A little higher • Normal discharging of the CLOG compartment and is heard and frost forms than ambient • refrigerant.

WHOLE CLOG

MOISTURE Cooling operation Flowing sound of refrigerant Lower than • Cooling operation restarts CLOG stops periodically. is not heard and frost melts. ambient • when heating the inlet of the

COMPRESSION

COMP- Freezer and Low flowing sound of A little higher • Low pressure at high side

DEFECTIVE

RESSION Refrigerator refrigerant is heard and ambient • of compressor due to low

STATE OF

THE UNIT

Refrigerator don't frost forms in inlet only. temperature. • Normal cooling is possible by cool normally. • restoring the normal amount of

Refrigerator don't formed. • restoring the normal amount of cool normally. • refrigerant and repairing the leak.

Refrigerator don't in inlet only. temperature. • The capillary tube is faulty. cool normally.

Freezer compartment and Refrigerator don't cool.

don't cool. frost forms in inlet only. temperature. • refrigerant level.

STATE OF THE

EVAPORATOR

Flowing sound of refrigerant Equal to ambient • Normal discharging of the is not heard and frost isn't temperature. • Refrigerant. formed.

TEMPERATURE

OF THE

REMARKS

COMPRESSOR

• refrigerant and repairing the leak.

temperature. • capillary tube.

NO COMP- No compressing Flowing sound of refrigerant Equal to ambient • No pressure in the high RESSION operation. is not heard and there is temperature. • pressure part of the

no frost. • compressor.

▼ 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.

Frost formed normally

Moisture Clog

Faulty Compressor.

Check Compressor

Check if frost forms in Evaporator.

Normal amount

Clogged by dust. Gas leakage.

No frost or frost forms in inlet only

Observe the discharged amount of Refrigerant.

Inject refrigerant in compressor and check cooling operation.

Frost formed normally

Check if oil leaks.

None or too much

(Find the leak and repair it)

- 18 -

Page 19

▼ General Control of Refrigerating Cycle

NO. ITEMS UNIT STANDARDS PURPOSES REMARKS

Pipe and

piping system opening time

Welding

2 sealed

parts

Refrige-

ration Cycle

Evacuation time

Vacuum degree

Vacuum

Vacuum piping

Min.

Nitrogen pressure

Confirm N

2 leak

Min.

Torr

Pipe: within 1 hour. Comp: within 10 minutes. Drier: within 20 minutes.

Weld under Nitrogen atmosphere. (N

2 pressure:

0.1~0.2 kg/cm

)

Confirm the sound of pressure relief when removing the rubber cap. Sound: usable No sound: not usable

More than 40 minutes

Below 0.03 (ref)

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

Use R-134a manifold exclusively.

To protect moisture penetration.

To protect oxide scale formation.

To protect moisture penetration.

To remove moisture.

To protect mixing of mineral and ester oils.

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.

Note: Only applicable to the model

equipped with reverse flow protect plate.

Vacuum efficiency can be improved by operating compressor during evacuation.

The rubber pipes for R-12 refrigerant will be melted when they are used for R-134a refrigerant (causes of leak.)

Refrigerant

weighing

Drier

replacement

Leak check

Pipe coupler

Outlet (Socket)

Plug

Use 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 R-12 refrigerant mixing.

Do not mix with R-12 refrigerant.

To remove the moisture from pipe inside.

Defect in refrigerant leak area.

- 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.

- 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.

- 19 -

Page 20

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER

• Adjusts EJECTOR to Start Position with power on.

Power On

Start Position

Ice Making

Mode

Harvest

Mode

Park Position

Fill

Test Mode

• Waits until water becomes cold after starting the ice making operation.

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

• Performs Ice Making Mode after supplying water by operating the SOLENOID in ICE VALVE.

• To operate LINE and SERVICE, press and hold the Fill Key for 3 seconds. The ice maker will run through 3 stages: Harvest Fill Icemaking.

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

7-1 OPERATION PRINCIPLE

7-1-1 Operation Principle of IceMaker

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

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

- 20 -

Page 21

7-2 CONTROL METHOD ACCORDING TO FUNCTIONS

Heater

off

30 sec.

10 sec.

Motor

Hall IC

Ice removing completion point

2 ms

Ice making sensor temperature is 50°F(10˚C) or more Max. 18 minutes After detect LEVER rises

7-2-1 Start Position

1. After POWER OFF or Power Outage, check the EJECTOR's position with MICOM initialization to restart.

2. How to check if it is in place:

- Check HIGH/LOW signals from HALL SENSOR in MICOM PIN.

3. Control Method to check if it is in place: (1) EJECTOR is in place,

- It is an initialized control, so the mode can be changed to ice making control.

(2) EJECTOR isn't in place:

A. If EJECTOR is back in place within 2 minutes with the motor on, it is being initialized. If not, go to Step B. B. If EJECTOR is back in place within 18 minutes with the heater on (to control Heater on its OFF condition), it is being

initialized. If not, it is not functioning. Repeat Step B with Heater and Motor off.

7-2-2 Ice Making Mode

1. Ice Making control refers to the freezing of supplied water in the ice trays. Complete ice making operations by measuring the temperature of the Tray with Ice-Making SENSOR.

2. Ice Making starts after completing fulfilled ice control and initial control.

3. The Ice Making function is completed when the sensor reaches 19°F(-7°C), 60 to 240 minutes after starting.

4. If the temperature sensor is defective, the ice-making function will be completed in 4 hours.

7-2-3 Harvest Mode

1. Ice-removing control refers to the operation of dropping cubes into the ice bin from the tray when ice-making has completed.

2. Ice removing control mode: (1) Operates Heater for 30 seconds; then operate MOTOR. (2) After performing Step 1 (to control the Heater on its off condition), Ice-Removal control will be back in place wthin 18

minutes. (Hall SENSOR sign = OV). Ice removal is then complete. Then change the mode to the water supply control. If this control phase fails to start, it is not functioning. Put the Heater and Motor in the off position. Restart every 2 hours. (Refer to fig.1)

NOTE : If the motor malfunctions and starts before the detect lever rises, MICOM regards the Ice-Removing phase as completed. Water then starts flowing. To prevent this, MICOM doesn’t switch to water-supply mode, but restarts the iceremoving mode. If this happens 3 times, the motor is malfunctioning and you should stop the loads (Heater, Motor). Then restart the Ice-Removing mode every 2 hours. (See Step 2 above.)

<fig1. Ice removing process>

- 21 -

Page 22

7-2-4 Fill / Park Position

1. When Ice-Removing control (Normal Ice-Removing control, Ice-Removing control for test) has completed, and the EJECTOR is in place, this control operates the ICE SOLENOID by time check in the compressor enclosure of the refrigerator. Then it supplies water to the ice making tray.

2. Water supply level is adjustable in levels 1-5 by pressing the water supply control Switch and fill time will be determined by the selected level.

Water supply amount TABLE

STAGE TIME TO SUPPLY INDICATIONS REMARKS

NOTE : Below is an example used by another vendor as an explanation of what is taking place.

6 sec.

7 sec.

8 sec.

9 sec.

10 sec.

The water amount will vary depending

on the water control Switch setting, as

well as the water pressure of the

connected water line.

- 22 -

Page 23

7-2-5 Function TEST

This is a compulsory operation for TEST, SVC, cleaning, etc. It is operated by pressing the water supply control KEY for 3 seconds.

2. It operates in the Ice Making mode, but not in the Ice-Removing mode or water supply process. (If there is an ERROR, it can only be checked in the TEST mode.)

3. If the water supply control KEY is pressed for 3 seconds in the Ice-Making mode (no matter what condition the IceMaking tray is in) the Ice-Removing operation starts immediately. Water is not yet frozen, so water is poured instead of ice. 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: ice making → Harvest → Fill → Park Position.

5. When Stage 5 is completed in the TEST mode, minimize MICOM in 5 seconds, the time needed to supply water resets to the previous status in the TEST mode.

Diagnosis TABLE

STAGE ITEMS INDICATOR REMARKS

HEATER

MOTOR

HALL IC (detection

of position) I

VALV E

HALL IC (detection

of full-filled Ice) II

reset

Mark previous status on TEST mode

Five seconds after heater starts, heater will go off if temperature recorded by sensor is 10°C 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.

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

You can check whether hall is sensing Full ice condition. (If there is a full-filled error, the fifth LED is not on.)

Five seconds after fifth stage is completed, the icemaker reset at initial status.

7-3 DEFECT DIAGNOSIS FUNCTION

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

NO DIVISION INDICATOR CONTENTS REMARKS

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

Normal

Ice-Making

Sensor

malfunction

Ice Maker Kit

malfunction

Mark time to

supply

Cut or short-circuited wire

When ejector blades don’t reach

park position over 18 minutes

since Harvest Mode starts.

None

Display switch

operates properly

Make sure that the wire

on each sensor is

connected.

Defects of

HALL IC/MOTOR/

HEATER/RELAY

- 23 -

Page 24

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

REFRIGERATOR TEMP

COLDER WARMER LOCK 37 °F IS RECOMMENDED 0 °F IS RECOMMENDED

DISPENSER

FREEZER TEMP

COLDER WARMERRESET

WATER FILTER

EXPRESS

FREEZING

DISPENSER MODEL

REFRIGERATOR TEMP

COLDER WARMER 37 °F IS RECOMMENDED 0 °F IS RECOMMENDED

FREEZER TEMP

COLDER WARMER

EXPRESS

FREEZING

BEST MODEL

8-1 FUNCTION

8-1-1 Function

1. When the appliance is plugged in, it is set to 37 °F for the Refrigerator and 0 °F for the Freezer. You can adjust the Refrigerator and the Freezer control temperature by pressing the COLDER button or the WARMER button.

2. When the power is initially applied or restored after a power failure, it is set to the setting temperature as you set before power off. (applied to DISPENSER MODEL)

Control range : 32°F ~ 46°F

0°C ~ 8°C

Control range : 32°F ~ 46°F

0°C ~ 8°C

8-1-2 How to Change the Temperature Mode to °F / °C

1. The setting temperature mode can be changed to °F / °C by pressing and holding COLDER key of Freezer and COLDER key of Refrigerator over 1 seconds. at the same time.

2. The initial setting is °F. Whenever the mode is changed, the LED lights are changed.

8-1-3 Dispenser Lock

1. Press and hold the DISPENSER LOCK button for 3 seconds to lock the dispenser.

2. When locked, the LED is off and the dispenser function is turned off.

3. Press and hold the DISPENSER LOCK button again for 3 seconds to unlock the dispenser. The LED will be on and the dispenser will function normally.

Control range : -6°F ~ 9°F

-21°C ~ -13°C

Control range : -6°F ~ 9°F

-21°C ~ -13°C

- 24 -

Page 25

8-1-4 CONTROL OF FREEZER FAN MOTOR

Closed Open Closed Open

3 Times 3 Times 3 Times 3 Times

Closed

Within 1 min. 1 min.

30 sec 30 sec 30 sec

Freezer Door

or Refrigerator

Door

Buzzer

1. Freezer fan motor has high and standard speeds.

2. High speed is used at power-up, for express freezing, and when refrigerator is overloaded. Standard speeds is used for general purposes.

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

4. High speed (2700RPM) : Initial power on or load corresponding operation, express freezing. Normal speed (2400RPM) : General working conditions.

5. Fan motor stops when refrigerator or freezer door opens.

8-1-5 EXPRESS FREEZING

1. The purpose of this function 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 cutage and the refrigerator is power on again, EXPRESS FREEZING function will be canceled.

4. To activate these function, to press the Express Freezing key and the LED will turn ON. This function will remain activated for 24 hrs. The first three hours the compressor and Freezer Fan will be ON. The next 21 hours the freezer will be controlled at the lowest temperature. After 24 hours or if the Express Freezing 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 EXPRESS FREEZING, EXPRESS FREEZING operates for the rest of time after defrost is

completed, when EXPRESS FREEZING operation time is less than 90 minutes. If EXPRESS FREEZING operates for more than 90 minutes, the EXPRESS FREEZING will operate for two hours after defrost is completed.

(3) If EXPRESS FREEZING is pressed during defrost, EXPRESS FREEZING LED is on but this function will start seven

minutes after defrost is completed and it shall operate for three hours.

(4) If EXPRESS FREEZING 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 compartment runs at high speed during EXPRESS FREEZING .

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

8-1-6 REFRIGERATOR LAMP AUTO OFF

1. To avoid heat damage caused by the lamp, it is turned off automatically when the refrigerator door is open for more than 7 minutes.

8-1-7 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 1/2 seconds. These tones repeat every 30 seconds.

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

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Page 26

8-1-8 Buzzer Sound

When the button on the front Display is pushed, a Ding~ Dong~ sound is produced. (Refer to the Buzzer Circuit 8-2-4 No. 3)

8-1-9 Defrosting (removing frost)

1. Defrosting starts each time the COMPRESSOR running time reaches 7 hours.

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 2 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function, 8-1-13.)

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

8-1-10 Filter Replacement Indication

1. In 6 months after the UNIT (refrigerator) is power on, or after 28,000 seconds of dispenser use, the water filter Indicator LED (red color) will be ON.

2. When the water filter indicator LED is illuminated, you should change the water filter. After this, you must press the water filter button for three seconds and you will hear a ding-dong sound. The LED will be OFF. This operation will indicate that the UNIT is reset to its initial conditions, so this process is restarted.

8-1-11 Power Failure Compensation Function

1. When the UNIT is power off, the Fresh Food and Freezer Temperature notches, the filter elapsed time for replacement, the temperature mode (°C or °F) and the dispenser lock mode are saved in the EEPROM.

2. When the UNIT is power on, the MICOM will read the specified EEPROM addresses to restore the values indicated in the previous paragraph.

8-1-12 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 ORDERS

Temperature of Defrosting Sensor is 113°F(45°C) or more (when unit is newly

Initial power on

purchased or when moved)

Temperature of defrosting sensor is lower than 113 °F(45°C) (when power cuts, SERVICE)

Reset to normal operation from TEST MODE

POWER

in 1/2 second in 1/2 second

POWER

in 1/2 second

in 1/2 second in 1/2 second

COMP

Total load

in 7 minute

OFF

COMP

Defrosting

heater ON

COMP

Freezer FAN

in 10 second

Freezer FAN

in 1/2 second

Defrosting

heater OFF

Freezer FAN

- 26 -

Page 27

8-1-13 Defect Diagnosis Function

 Defect code signs Defect code signs

REFRIGERATOR TEMP

COLDER WARMER LOCK 37 °F IS RECOMMENDED 0 °F IS RECOMMENDED

DISPENSER

FREEZER TEMP

COLDER WARMERRESET

EXPRESS

FREEZING

DISPENSER MODEL

REFRIGERATOR TEMP

COLDER WARMER 37 °F IS RECOMMENDED 0 °F IS RECOMMENDED

FREEZER TEMP

COLDER WARMER

EXPRESS

FREEZING

BEST MODEL

WATER FILTER

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 the defect CODE removes the sign, it returns to normal operation (RESET).

4. The defect CODE shows on the Refrigerator and Freezer Display.

ERROR CODE on display panel

NO ITEM

Failure of freezer

sensor

Failure of

Refrigerator sensor

Failure of defrost

sensor

Failure of defrost

mode

Failure of BLDC FAN MOTOR at

freezing compartment.

ERROR CODE



CONTENTS REMARKS

Cut or short circuit wire

Inspect Connecting wires

Cut or short circuit wire

Snapping of defrost heater

When defrost sensor

doesn’t reach 8°C within 2

hours after starting defrost.

If there is no fan motor

signal For more than

65sec. in Operation fan

motor

or Temperature fuse, pull-

out of Connector (indicated

minimum 2 Hours after

Poor motor, hooking to

Wires of fan, contact of

structures to fan, snapping

or short circuit of Lead wire

on each sensor

failure occurs)

- 27 -

Page 28

8-1-14 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 while 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.

MODE MANIPULATION CONTENTS REMARKS

TEST1

TEST2

Reset

NOTE : LED CHECK MODE: When the WARMER button in the refrigerator temperature control and the WARMER button in

the freezer temperature control are pushed and held for 1 second or longer, every LED on the display turns on at the same time. When the buttons are released, the previous mode is restored.

Push Express Freezing key and COLDER KEY of Freezer Temp. at the same time over 3 seconds.

Push Express Freezing key and COLDER KEY of Freezer Temp. at the same time over 3 seconds in TEST MODE 1

Push Express Freezing key and COLDER KEY of Freezer Temp. at the same time over 3 seconds. in TEST MODE 2

1. Continuous operation of the COMPRESSOR

2. Continuous operation of the freezer fan

3. STEPPING DAMPER OPEN

4. Defrosting Heater OFF

5. Every DISPLAY LED ON

1. COMP OFF

2. Freezer FAN OFF

3. STEPPING DAMPER CLOSE

4. Defrosting heater ON

5. DISPLAY LED shows 222

Reset to the previously setting before TEST MODE

Reset if the temperature of the Defrosting sensor is 46°F(8°C) or more.

The compressor will Start after a 7-minute delay.

* Freezer Fan RPM Variable Check:

In case the freezer fan is in operation when the WARMER 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.

* Demostration MODE:

1. When the WARMER KEY of refrigerator Temp. control or of freezer Temp. control in the the warmest temperature’s status are pushed and held for 3 seconds or longer, It converts to Demonstration Mode.

2. It shows OFF on the display panel.

3. In this status, all Loads are off (Compressor / Fan / Damper / Heater) (Even is Demonstration Mode, the refrigerator Lamp automatic off function warks normally and can be demonstrated)

4. Exit the test mode and reset the display by pressing the COLDER and WARMER buttons.

- 28 -

Page 29

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 VA 1 CE 3 CE 4 CE 5

VOLTAGE 115 Vac 12 Vdc 15.5 Vdc 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 -

Page 30

8-2-2 Oscillation Circuit

- 30 -

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.)

Page 31

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

- 31 -

FREEZER DOOR

SWITCH

REFRIGERATOR

DOOR SWITCH

G5SB-14

1. Load Drive Condition Check

LOAD TYPE

Measurement Location (IC6)

Condition

OFF

COMP

DEFROSTING

HEATER

LAMP

TCM

POWER MODE

(OPTIONAL)

NO.13 NO.14 NO.16 NO.12 NO.15

1V or below

12V

VALV E

(DISPENSER

MDL)

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.

part part part

a b

MOTOR OFF 2V or less 0V 5V

MOTOR ON 13V~15V 0V 2V~3V

Page 32

3. Buzzer Drive Condition Check

0 V

5 V

0 V

5 V

0.5 s 0.5 s

2.63 kz (Beep~)

OFF

0.05 s

0.1 s0.2 s 2 s

0 V

5 V

0 V

5 V

2.63 kz

(

Ding~)

2.21 kz (

Dong~)

FREEZER DOOR SWITCH

REFRIGERATOR DOOR SWITCH

Condition

Measure-

Tone (Ding~Dong~) when the button on

the display is pushed.

Alarm for open door

(beep-beep-beep)

ment Location

IC1 ( ) 0 V

4. Open Door Detection Circuit Check

OFF

Freezer/ Refrigerator Door

Measurement

Location

Closed 5 V

Open 0 V

(PIN NO.63 & PIN NO.8)

- 32 -

Page 33

8-2-5 Temperature Sensor Circuit

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:

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

Freezer Sensor POINT Voltage

Refrigerator Sensor POINT Voltage 0.5 V ~ 4.5 V 0 V 5 V

Defrosting Sensor POINT Voltage

SHORT-CIRCUITED

OPEN

- 33 -

Page 34

8-2-6 Refrigeration Compartment Stepping Motor Damper Circuit

PUMP SWITCH

123

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

8-2-7 Dispenser Input/LED Output Circuit

- 34 -

Page 35

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

1. Refrigerator Temperature Compensation

Refrigerator

Resistance Temperature Remark

(RCR) Compensation

180 KΩ +2.5°C Compensation by

56 KΩ +2.0°C

33 KΩ +1.5°C

18 KΩ +1.0°C

12 KΩ +0.5°C

10 KΩ 0 °C

8.2 KΩ -0.5°C Compensation by

5.6 KΩ -1.0°C

3.3 KΩ -1.5°C

2 KΩ -2.0°C

470 Ω -2.5°C

2. The temperature compensation for refrigerator compartment is in the following table:

Revised resistance

Present resistance

470Ω change Up Up Up Up Up Up Up Up Up Up

2kΩ Down Change Up Up Up Up Up Up Up Up Up

3.3kΩ Down Down Change Up Up Up Up Up Up Up Up

5.6kΩ Down Down Down Change Up Up Up Up Up Up Up

8.2kΩ Down Down Down Down Change Up Up Up Up Up Up

Refrigerator 2.5°C 2°C 1.5°C 1°C 0.5°C No 0.5°C 1°C 1.5°C 2°C 2.5°C

(RCR) 10kΩ Down Down Down Down Down Change Up Up Up Up Up

12kΩ Down Down Down Down Down Down Change Up Up Up Up

18kΩ Down Down Down Down Down Down Down Change Up Up Up

33kΩ Down Down Down Down Down Down Down Down Change Up Up

56kΩ Down Down Down Down Down Down Down Down Down Change Up

180kΩ Down Down Down Down Down Down Down Down Down Down Change

470Ω 2kΩ 3.3kΩ 5.6kΩ 8.2kΩ 10kΩ 12kΩ 18kΩ 33kΩ 56kΩ 180kΩ

No 0.5°C 1°C 1.5°C 2°C 2.5°C 3°C 3.5°C 4°C 4.5°C 5°C

0.5°C No 0.5°C 1°C 1.5°C 2°C 2.5°C 3°C 3.5°C 4°C 4.5°C

1°C 0.5°C No 0.5°C 1°C 1.5°C 2°C 2.5°C 3°C 3.5°C 4°C

1.5°C 1°C 0.5°C No 0.5°C 1°C 1.5°C 2°C 2.5°C 3°C 3.5°C

2°C 1.5°C 1°C 0.5° No 0.5°C 1°C 1.5°C 2°C 2.5°C 3°C

3°C 2.5°C 2°C 1.5°C 1°C 0.5°C No 0.5°C 1°C 1.5°C 2°C

3.5°C 3°C 2.5°C 2°C 1.5°C 1°C 0.5°C No 0.5°C 1°C 1.5°C

4°C 3.5°C 3°C 2.5°C 2°C 1.5°C 1°C 0.5°C No 0.5°C 1°C

4.5°C 4°C 3.5°C 3°C 2.5°C 2°C 1.5°C 1°C 0.5°C No 0.5°C

5°C 4.5°C 4°C 3.5°C 3°C 2.5°C 2°C 1.5°C 1°C 0.5°C No

raising the

temperature

Standard Temperature

lowering the temperature

➧ Table of Temperature Compensation by adjusting the

resistance (difference from the current temperature) e.g., If the refrigerator compensation resistance (RCR) is changed from 10K (the current resistance) to 18K (the adjustment resistance), the temperature of the refrigerator rises 33.8°F(+1°C).

NOTE: This circuit is designed to input the necessary temperature compensation values into the MICOM. This adjusts the

refrigerator temperature, which is different in each model.

- 35 -

Page 36

8-2-9 Key Button Input & Display Light-On Circuit

220 1 2W

R25

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

corresponding function indication LED (LED Module) SEVEN SEGMENT DISPLAY (SEVEN SEGMENT DISPLAY MODULE). The drive type is the scan type

8-2-10 Power Failure Compensation Circuit (DISPENSER MODEL)

- 36 -

Page 37

8-3 RESISTANCE SPECIFICATION OF SENSOR

TEMPERATURE DETECTED RESISTANCE OF FREEZER

BY SENSOR SENSOR

- 20 ˚C 22.3 KΩ 77 KΩ

- 15 ˚C 16.9 KΩ 60 KΩ

- 10 ˚C 13.0 KΩ 47.3 KΩ

- 5 ˚C 10.1 KΩ 38.4 KΩ

0 ˚C 7.8 KΩ 30 KΩ

+ 5 ˚C 6.2 KΩ 24.1 KΩ

+ 10 ˚C 4.9 KΩ 19.5 KΩ

+ 15 ˚C 3.9 KΩ 15.9 KΩ

+ 20 ˚C 3.1 KΩ 13 KΩ

+ 25 ˚C 2.5 KΩ 11 KΩ

+ 30 ˚C 2.0 KΩ 8.9 KΩ

+ 40 ˚C 1.4 KΩ 6.2 KΩ

+ 50 ˚C 0.8 KΩ 4.3 KΩ

RESISTANCE OF REFRIGERATOR &

DEFROST SENSOR & ROOM SENSOR

• The resistance of the SENSOR has a ±5% common difference.

• 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.

• Measure the F-SENSOR, SUPER FROST SENSOR, R1, R2-SENSOR after disconnect CON5 of PWB ASSY, MAIN.

- 37 -

Page 38

COOLING is poor. NO COOLING. 1. If the COMPRESSOR USE TEST MODE1 COMPRESSOR locked or Replace COMPRESSOR.

is poor.

POWER SOURCE 1.

8-4 TROUBLESHOOTING

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

4. Door Line contact. Check the seal when Door liner damaged. Replace door liner.

the door is closed.

3. If SENSOR Check the resistance SENSOR RESISTANCE is Replace SENSOR.

is normal. of the Refrigerator poor.

is normal. sticking on the EVAPORATOR . is poor.

SENSOR.

2. If DEFROSTING Check the amount of frost DEFROSTING is poor. See DEFROSTING

FREEZER 1. If FAN MOTOR USE TEST MODE1 FAN MOTOR is poor. Replace the FAN MOTOR.

TEMPERATURE is operates. (forced COOLING).

incorrect CONNECTING WIRE is poor. Certify the MOTOR and the

2. If refrigerant is leaking. Measure the amount of frost Refrigerant leakage. Replace the leaking part and

sticking on EVAPORATOR replace any lost refrigerant.

and the surface temperature

of the condenser pipe.

DISPLAY operates the MAIN PWB CONNECTOR. is poor.

abnormally CONNECTOR. TRANS FUSE is open. Replace TRANS.

operate.

(forced COOLING).

If less than 7 minutes pass OLP, PTC is poor. Replace OLP, PTC.

after compressor shuts off, COMPRESSOR RELAY is Replace MAIN PWB.

don’t press the KEY and poor.

wait. THE CONNECTING WIRE Check the connection of the

2. DISPLAY is off.

The whole DISPLAY

LED/SEVEN SEGMENT

DISPLAY LED/

SEVEN SEGMENT

2. If LAMP is dim. Check visually. Applied voltage error. Use boosting TRANS.

3. The connection of Check connection of CONNECTOR connection Reconnect CONNECTOR.

1. FREEZER/ Check if FREEZER/ POWER SOURCE is poor. Check outlet Voltage.

REFRIGERATOR. REFRIGERATOR DOOR IS

OPEN and check display.

connection of the black wire

of the MAIN PWB

CONNECTOR (CON2).

is poor. black wire of the MAIN PWB

CONNECTOR (CON2).

blocked.

- 38 -

Page 39

DEFROSTING is NO DEFROSTING. 1. If HEATER emits heat. USE TEST MODE2 HEATER disconnection. Replace HEATER.

poor. (forced DEFROSTING).

COOLING is poor. If REFRIGERATOR 1. If FREEZER TEMPERATURE Check is FREEZER Make sure the

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

TEMPERATURE is normal. TEMPERATURE is too low. DOOR isattached.

is too low. 2. If amount of cool air from Make sure that the amount FAN MOTOR is poor. Replace FAN MOTOR.

3. If ice remains after Make sure that DEFROST Connection is poor. Reassemble the

DEFROSTING. SENSOR is connected. DEFROST-SENSOR.

Make sure that FREEZER /

REFRIGERATOR DOOR is closed.

DOOR does not close Reassemble DOOR.

properly. Replace GASKET.

2. If DRAIN PIPE is Check DRAIN PIPE. DRAIN PIPE is blocked. Remove ice and impurities.

blocked. Check HEATER PLATE

DEFROST-SENSOR is poor. Replace DEFROST-SENSOR.

HEATER RELAY is poor. Replace RY3 of MAIN PWB.

3. Door Line contact. Check door seal when Door liner damaged. Replace Door liner.

door is closed.

TEMPERATURE FUSE Replace TEMPERATURE

disconnection. FUSE.

Connection is poor. Check EVAPORATOR

FAN MOTOR is and speed of cool air are Passage of cool air Remove impurities.

sufficient. sufficient by touching the is blocked.

check supplied on the EVA frozen. See DEFROSTING is poor.

REFRIGERATOR.

resistance.

connection and wire of MAIN

PWB CONNECTOR.

- 39 -

Page 40

8-5 MAIN PWB ASSEMBLY AND PARTS LIST

8-5-1 Main PWB Assembly

- 40 -

Page 41

8-5-2 Replacement Parts List

- 41 -

Page 42

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

SW106

Dispenser Model

Best Model

- 42 -

Page 43

8-6 PWB DIAGRAM

FREEZER DOOR SWITCH

REFRIGERATOR DOOR SWITCH

PWB ASSEMBLY

G5SB-14

RY4

RY5

8-6-1 PWB Main Assembly

- 43 -

Page 44

FREEZER SENSOR

FREEZER DOOR SWITCH

REFRIGERATOR DOOR SWITCH

REFRIGERATOR SENSOR

DEFROST SENSOR

220 1/2W

- 44 -

Page 45

9. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

BETTER / GOOD MODEL

ADJUST

WARMER

REFRIGERATOR TEMP FREEZER TEMP

4 IS RECOMMENDED

COLDER

EXPRESS

FREEZING

ADJUST

WARMER

4 IS RECOMMENDED

COLDER

9-1 FUNCTION

9-1-1 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".

9-1-2 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 express freezing, 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 hign speed.

4. High speed (2500RPM) : Initial power on or load corresponding operation, express freezing Normal speed (2200RPM) : General working conditions.

5. Fan motor stops when refrigerator of freezer door opens.

9-1-3 EXPRESS FREEZING

1. The purpose of this function 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, EXPRESS FREEZING function will be canceled.

4.To activate these function you need to press the Express Freezing key and the LED will turn ON. This function will remain

activated for 24 hrs. The first three hours the compressor and Freezer Fan will be ON. The next 21hours the freezer will be controlled at the lowest temperature. After 24 hours or if the Express Freezing 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 EXPRESS FREEZING, EXPRESS FREZZING operates for the rest of time after defrost is

completed, when EXPRESS FREZZING operation time is less than 90 minutes. If EXPRESS FREZZING operates for more than 90minutes, the EXPRESS FREZZING will operate for two hours after defrost is completed.

(3) If EXPRESS FREZZING is pressed during defrost, EXPRESS FREZZING LED is on but this function will start seven

minutes after defrost is completed and it shall operate for three hours.

(4) If EXPRESS FREZZING 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 compartment rotates at high speed during EXPRESS FREZZING.

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

9-1-4. REFRIGERATOR LAMP AUTO OFF

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

- 45 -

Page 46

9-1-5 Alarm for Open Door

Closed Open Closed Open

3 Times 3 Times 3 Times 3 Times

Closed

Within 1 min. 1 min.

30 sec 30 sec 30 sec

Freezer Door

or Refrigerator

Door

Buzzer

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 1/2 seconds. These tones repeat every 30 seconds.

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

9-1-6 Buzzer Sound

When the button on the front Display is pushed, a Ding~ Dong~ sound is produced. (Refer to the Buzzer Circuit 7-2-4 No. 2)

9-1-7 Defrosting (removing frost)

1. Defrosting starts each time the COMPRESSOR running time reaches 7 hours.

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

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

9-1-8 Electrical Parts Are Turned On Sequentially

OPERATING ORDERS

Temperature of Defrosting

Initial power on

Reset to normal operation from TEST MODE

Sensor is 45°C or more (when unit is newly

purchased or when moved)

Temperature of defrosting sensor is lower than 45°C (when power cuts, SERVICE)

POWER

in 1/2 second in 1/2 second

POWER

in 1/2 second

in 1/2 second in 1/2 second

COMP

Total load

in 7 minute

OFF

COMP

Defrosting

heater ON

COMP

Freezer FAN

in 10 second

Freezer FAN

in 1/2 second

Defrosting

heater OFF

Freezer FAN

- 46 -

Page 47

9-1-9 Defect Diagnosis Function

 Defect code signs Defect code signs

ADJUST

WARMER

REFRIGERATOR TEMP FREEZER TEMP

4 IS RECOMMENDED

COLDER

EXPRESS FREEZING

ADJUST

WARMER

4 IS RECOMMENDED

COLDER

LED OFF

LED ON

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 the defect CODE removes the sign, it returns to normal operation (RESET).

4. The defect CODE shows on the Refrigerator and Freezer Display.

ERROR CODE on display panel

NO ITEM

Failure of freezer

sensor

Failure of

Refrigerator sensor

Failure of defrost

sensor

Poor of defrost

ERROR CODE



All off

CONTENTS REMARKS

Cut or short circuit wire

Inspect Connecting

wires on each sensor

Cut or short circuit wire

Snapping of defrost

2hours later After

heater or Temperature

starting defrost, If

sensor doesn’t be over

46°F (8°C)

Connector (indicated

minimum 2 Hours

after failure occurs)

fuse, pull-out of

- 47 -

Page 48

9-1-10 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 while 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.

MODE MANIPULATION CONTENTS REMARKS

TEST1

TEST2

Reset

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.

Push Express Freezing key and COLDER KEY of Freezer Temp. at the same time over 3 seconds.

Push Express Freezing key and COLDER KEY of Freezer Temp. at the same time over 3 seconds in TEST MODE 1

Push Express Freezing key and COLDER KEY of Freezer Temp. at the same time over 3 seconds. in TEST MODE 2

1. Continuous operation of the COMPRESSOR

2. Continuous operation of the freezer fan

3. STEPPING DAMPER OPEN

4. Defrosting Heater OFF

5. Every DISPLAY LED ON

1. COMP OFF

2. Freezer FAN OFF

3. STEPPING DAMPER CLOSE

4. Defrosting heater ON

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

Reset to the previously setting before TEST MODE

Reset if the temperature of the Defrosting sensor is 46°F (8°C) or more.

The compressor will Start after a 7-minute delay.

* Freezer Fan RPM Variable Check:

* Demonstration MODE:

1. When the KEY of refrigerator Temp. control or of freezer Temp. control is pushed and held over 5 seconds, warmest 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 warks normally and can be demonstrated)

4. It reset if you do again as clause.

- 48 -

Page 49

9-2 PCB FUNCTION

9-2-1 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 VA 1 CE 2 CE 1 CE 4

VOLTAGE 115 Vac 12 Vdc 15.5 Vdc 5 V

- 49 -

Page 50

9-2-2 Oscillation Circuit

9-2-3 Reset Circuit

- 50 -

Page 51

9-2-4 Load / Buzzer Drive & Open Door Detection Circuit

G5SB-14

RY5

1. Load Drive Condition Check

LOAD TYPE

Measurement Location (IC4)

Condition

OFF

COMP

DEFROSTING

HEATER

LAMP

FREEZER

FAN MOTOR

(HIG RPM)

FREEZER

FAN MOTOR

(LOW RPM)

NO.11 NO.14 NO.15 NO.12 NO.13

1V or below

12V

- 51 -

Page 52

2. Buzzer Drive Condition Check

0 V

5 V

0 V

5 V

0.5 s 0.5 s

2.63 kz (Beep~)

OFF

0.05 s

0.1 s0.2 s 2 s

0 V

5 V

0 V

5 V

2.63 kz

(

Ding~)

2.21 kz (

Dong~)

Condition

Measure-

Tone (Ding~Dong~) when the button on

the display is pushed.

Alarm for open door

(beep-beep-beep)

ment Location

IC1 ( ) 0 V

3. Open Door Detection Circuit Check

OFF

Freezer/ Refrigerator Door

Measurement

Location

Closed 5 V

Open 0 V

- 52 -

(PIN NO.31 & PIN NO.30)

Page 53

9-2-5 Temperature Sensor Circuit

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

Freezer Sensor POINT Voltage

Refrigerator Sensor POINT Voltage 0.5 V ~ 4.5 V 0 V 5 V

Defrosting Sensor POINT Voltage

SHORT-CIRCUITED

OPEN

- 53 -

Page 54

9-2-6 Refrigeration Compartment Stepping Motor Damper Circuit

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

- 54 -

Page 55

9-2-7 Temperature Compensation & Overcooling/Undercooling Compensation Circuit

1. Refrigerator Temperature Compensation

Refrigerator

Resistance Temperature Remark

(RCR) Compensation

180 KΩ +2.5°C Compensation by

56 KΩ +2.0°C 33 KΩ +1.5°C 18 KΩ +1.0°C 12 KΩ +0.5°C 10 KΩ 0 °C

8.2 KΩ -0.5°C Compensation by

5.6 KΩ -1.0°C

3.3 KΩ -1.5°C 2 KΩ -2.0°C

470 Ω -2.5°C

2. The temperature compensation for refrigerator compartment is in the following table:

Revised resistance

Present resistance

470Ω change Up Up Up Up Up Up Up Up Up Up

2kΩ Down Change Up Up Up Up Up Up Up Up Up

3.3kΩ Down Down Change Up Up Up Up Up Up Up Up

5.6kΩ Down Down Down Change Up Up Up Up Up Up Up

8.2kΩ Down Down Down Down Change Up Up Up Up Up Up

Refrigerator 2.5°C2°C 1.5°C1°C 0.5°C No 0.5°C1°C 1.5°C2°C 2.5°C

(RCR) 10kΩ Down Down Down Down Down Change Up Up Up Up Up

12kΩ Down Down Down Down Down Down Change Up Up Up Up

18kΩ Down Down Down Down Down Down Down Change Up Up Up

33kΩ Down Down Down Down Down Down Down Down Change Up Up

56kΩ Down Down Down Down Down Down Down Down Down Change Up

180kΩ Down Down Down Down Down Down Down Down Down Down Change

470Ω 2kΩ 3.3kΩ 5.6kΩ 8.2kΩ 10kΩ 12kΩ 18kΩ 33kΩ 56kΩ 180kΩ

No 0.5°C1°C 1.5°C2°C 2.5°C3°C 3.5°C4°C 4.5°C5°C

0.5°C No 0.5°C1°C 1.5°C2°C 2.5°C3°C 3.5°C4°C 4.5°C

1°C 0.5°C No 0.5°C1°C 1.5°C2°C 2.5°C3°C 3.5°C4°C

1.5°C1°C 0.5°C No 0.5°C1°C 1.5°C2°C 2.5°C3°C 3.5°C

2°C 1.5°C1°C 0.5° No 0.5°C1°C 1.5°C2°C 2.5°C3°C

3°C 2.5°C2°C 1.5°C1°C 0.5°C No 0.5°C1°C 1.5°C2°C

3.5°C3°C 2.5°C2°C 1.5°C1°C 0.5°C No 0.5°C1°C 1.5°C

4°C 3.5°C3°C 2.5°C2°C 1.5°C1°C 0.5°C No 0.5°C1°C

4.5°C4°C 3.5°C3°C 2.5°C2°C 1.5°C1°C 0.5°C No 0.5°C

5°C 4.5°C4°C 3.5°C3°C 2.5°C2°C 1.5°C1°C 0.5°CNo

raising the

temperature

Standard Temperature

lowering the temperature

➧ Table of Temperature Compensation by adjusting the

NOTE: This circuit is designed to input the necessary temperature compensation values into the MICOM. This adjusts the

refrigerator temperature, which is different in each model.

- 55 -

Page 56

9-2-8 Key Button Input & Display Light-On Circuit

150J

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

corresponding function indication LED DISPLAY. The drive type is the scan type.

- 56 -

Page 57

9-3 RESISTANCE SPECIFICATION OF SENSOR

TEMPERATURE DETECTED RESISTANCE OF FREEZER

BY SENSOR SENSOR

- 20 ˚C 22.3 KΩ 77 KΩ

- 15 ˚C 16.9 KΩ 60 KΩ

- 10 ˚C 13.0 KΩ 47.3 KΩ

- 5 ˚C 10.1 KΩ 38.4 KΩ

0 ˚C 7.8 KΩ 30 KΩ

+ 5 ˚C 6.2 KΩ 24.1 KΩ

+ 10 ˚C 4.9 KΩ 19.5 KΩ

+ 15 ˚C 3.9 KΩ 15.9 KΩ

+ 20 ˚C 3.1 KΩ 13 KΩ

+ 25 ˚C 2.5 KΩ 11 KΩ

+ 30 ˚C 2.0 KΩ 8.9 KΩ

+ 40 ˚C 1.4 KΩ 6.2 KΩ

+ 50 ˚C 0.8 KΩ 4.3 KΩ

RESISTANCE OF REFRIGERATOR &

DEFROST SENSOR & ROOM SENSOR

• The resistance of the SENSOR has a ±5% common difference.

• 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.

• Measure the F-SENSOR, SUPER FROST SENSOR, R1, R2-SENSOR after disconnect CON5 of PWB ASSY, MAIN.

- 57 -

Page 58

COOLING is poor. NO COOLING. 1. If the COMPRESSOR USE TEST MODE1 COMPRESSOR locked or Replace COMPRESSOR.

is poor.

POWER SOURCE 1.

9-4 TROUBLESHOOTING

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

4. Door Line contact. Check the seal when Door liner damaged. Replace door liner.

the door is closed.

3. If SENSOR Check the resistance SENSOR RESISTANCE is Replace SENSOR.

is normal. of the Refrigerator poor.

is normal. sticking on the EVAPORATOR . is poor.

SENSOR.

2. If DEFROSTING Check the amount of frost DEFROSTING is poor. See DEFROSTING

FREEZER 1. If FAN MOTOR USE TEST MODE1 FAN MOTOR is poor. Replace the FAN MOTOR.

TEMPERATURE is operates. (forced COOLING).

incorrect CONNECTING WIRE is poor. Certify the MOTOR and the

2. If refrigerant is leaking. Measure the amount of frost Refrigerant leakage. Replace the leaking part and

. sticking on EVAPORATOR replace any lost refrigerant.

and the surface temperature

of the condenser pipe.

DISPLAY operates the MAIN PWB CONNECTOR. is poor.

abnormally CONNECTOR. TRANS FUSE is open. Replace TRANS.

operate.

(forced COOLING).

If less than 7 minutes pass OLP, PTC is poor. Replace OLP, PTC.

after compressor shuts off, COMPRESSOR RELAY is Replace MAIN PWB.

don’t press the KEY and poor.

wait. THE CONNECTING WIRE Check the connection of the

2. DISPLAY is off.

The whole DISPLAY

LED/SEVEN SEGMENT

DISPLAY LED/

SEVEN SEGMENT

2. If LAMP is dim. Check visually. Applied voltage error. Use boosting TRANS.

3. The connection of Check connection of CONNECTOR connection Reconnect CONNECTOR.

1. FREEZER/ Check if FREEZER/ POWER SOURCE is poor. Check outlet Voltage.

REFRIGERATOR. REFRIGERATOR DOOR IS

OPEN and check display.

connection of the black wire

of the MAIN PWB

CONNECTOR (CON2).

is poor. black wire of the MAIN PWB

CONNECTOR (CON2).

blocked.

- 58 -

Page 59

DEFROSTING is NO DEFROSTING. 1. If HEATER emits heat. USE TEST MODE2 HEATER disconnection. Replace HEATER.

poor. (forced DEFROSTING).

COOLING is poor. If REFRIGERATOR 1. If FREEZER TEMPERATURE Check is FREEZER Make sure the

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

TEMPERATURE is normal. TEMPERATURE is too low. DOOR isattached.

is too low. 2. If amount of cool air from Make sure that the amount FAN MOTOR is poor. Replace FAN MOTOR.

3. If ice remains after Make sure that DEFROST Connection is poor. Reassemble the

DEFROSTING. SENSOR is connected. DEFROST-SENSOR.

Make sure that FREEZER /

REFRIGERATOR DOOR is closed.

DOOR does not close Reassemble DOOR.

properly. Replace GASKET.

2. If DRAIN PIPE is Check DRAIN PIPE. DRAIN PIPE is blocked. Remove ice and impurities.

blocked. Check HEATER PLATE

DEFROST-SENSOR is poor. Replace DEFROST-SENSOR.

HEATER RELAY is poor. Replace RY3 of MAIN PWB.

3. Door Line contact. Check door seal when Door liner damaged. Replace Door liner.

door is closed.

TEMPERATURE FUSE Replace TEMPERATURE

disconnection. FUSE.

Connection is poor. Check EVAPORATOR

FAN MOTOR is and speed of cool air are Passage of cool air Remove impurities.

sufficient. sufficient by touching the is blocked.

check supplied on the EVA frozen. See DEFROSTING is poor.

REFRIGERATOR.

resistance.

connection and wire of MAIN

PWB CONNECTOR.

- 59 -

Page 60

9-5 MAIN PWB ASSEMBLY AND PARTS LIST

9-5-1 Main PWB Assembly

- 60 -

Page 61

9-5-2 Replacement Parts List

- 61 -

Page 62

9-5-3 PWB Assembly, Display, And Parts List

- 62 -

Page 63

9-6 PWB DIAGRAM

G5S-1A

RY5

9-6-1 PWB Main Assembly

- 63 -

Page 64

- 64 -

Page 65

#EV#

EXPLODED VIEW

CASE PARTS

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

103B

281A

619B

S38

328A

328B

411A

314A

501A

319C

307A

312A

410G

318A

420A

501F

304A

105A

317A

319A

308A

329C

103A

S07

309A

310A

327A

323B

282H

282E

106A

305B

903E

903D

610A

305C

610A

145B

281C

283B

281B

406B

125D

284D

106A

409B

405A

S22

158E

B01

503D

281C

158A

282B

503C

B01

283B

284D

409B

418A

106B

410A

503E

301A

S01

409D

120B

503G

405C

405F

262A

611D

627B

611B

611C

611A

282F

145A

401A

405B

404A

405C

319E

329A

332A

: on some models

305C

305B

105F

903B

903A

- 41-

-65 -

315A

903B

135C

103C

Page 66

#EV#

- 66 -

FREEZER PARTS

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

136F

136B

125A

285A

249G

145D

131A

145G

136A

237C

248F

248E

: on some models

- 0

Page 67

#EV#

- 67 -

REFRIGERATOR PARTS

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

103E

142E

S24

128M

142B

128G

128C

278C

1140A

1140B

140F

128B

142D142A

S24

103E

128A

170A

141A

103E

128A

146D

141D

149C

141B

141C

LRDN22734WW

LRDN22734ST

LRDN22734TT

LRDN22734SB

149E

141E

LRDC22744TT

LRDC22744SW

LRDC22744ST

Page 68

#EV#

- 68 -

REFRIGERATOR PARTS

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

S24

128B

114422E

114433F

11440B

114422D

S24

128B

S24

128A

170A

S24

143E

140E

128A

140B

146D

S24

140D

S24

143E

140E

140B

S24

LRDN20724TT

LRDN20724ST

LRDN20724SB

140D

LRDN22712SW

LRDN22712ST

LRDN20724WW

-6

Page 69

#EV#

- 69 -

REFRIGERATOR PARTS

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

147C*

147B

147A

103E

167B

154A

103E

151A

103E

151C

151A

155B

103E

167B

160B

161A

151C

151A

168A

154A

160B

161A

151A

155B

: on some models

-6 -

Page 70

#EV#

- 70 -

DOOR PARTS

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

241C

237A*

241D

241E

241A

241B

212J

212F

212J

212F

233A

244H

230A

231A

286A

212G212G

244E

700C

286A

243A

248P

: on some models

205B*

205D

621A

205A*

205C*

621A

244F

212J

203A

200A

248N

201A

212B

700B

212J

244G

- 70 -

Page 71

#EV#

- 71 -

DOOR PARTS

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

147D

241B

S03

241A

233A

244B

230A

231A

286A

212G

248P

248N

313A

410B

237A

241C

237A

313A

241D

281H

241E

281D

281G

210B

210A

S03

244A

244C

616B*

621B*

113C*

203A

406C*

200A

700C

201A

501B*

616A*

243A

279B*

120H*

276B*

281F*

403A*

279C*

286A

700B

: on some models

281H

281D

281G

210A

205B

- -

244J

205C

245A

212A

205A

245B

Page 72

#EV#

- 72 -

ICE MAKER PARTS

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

602A

S28

616D

627B

262B

600A

629B

615A

629A

628F

262B

629B

629C

628G

628C

* *

627B262D

628E

628B

628D

628G

-7 -

Page 73

#EV#

- 73 -

ICE & WATER PARTS

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

623C

623B

625A

616D

621B

618A

627A

616G

616F

627A

* *

623C

623A

* *

622A

616E

627A *

623C *

262D

619C

619A

Page 74

#EV#

- 74 -

LRDC22744ST

LOC DESCRIPTION PART NO. LOC DESCRIPTION PART NO.

103A HANDLE,BACK 3650JJ2003M 283B HINGE,L 4774JJ3001A

103B HANDLE,BACK 3650JJ2003L 284D SCREW,DRAWING 1STZJA3004K

103C COVER ASSEMBLY,LOWER 3551JJ1015F 285A GUIDE ASSEMBLY,RAIL 4975JJ2007G

103E RAIL,SLIDE 5218JJ3001A 286A BUSH 4984JJ3003A

103E RAIL,SLIDE 5218JJ3001A 301A EVAPORATOR ASSEMBLY 5421JJ1001B

103E RAIL,SLIDE 5218JJ3001A 304A COVER ASSEMBLY,BACK-M/C 3551JJ2008B

103E RAIL,SLIDE 5218JJ3001A 305B ROLLER 4580JJ3001A

105A DRAIN ASSEMBLY,PIPE-Z 5251JA3003B 305C PIN,DRAWING 4J04238A

105F SKIRT,LOWER 5070JJ3002A 305C PIN,DRAWING 4J04238A

106A LEG ASSEMBLY,ADJUST 4779JJ2001A 307A COMPRESSOR,SET ASSEMBLY 2521C-A5725

106B WASHER,DRAWING 4J00382C 308A P.T.C ASSEMBLY 6748C-0004D

113C SPRING,W 4970JJ3004A 309A O.L.P 6750CR0004S

120B DUCT ASSEMBLY,MULTI 5209JJ1002A 310A COVER,P.T.C 3550JA2042A

120H COVER,LED 3550JJ3003A 312A RUBBER,SEAT 5040JA3031A

128A GUIDE ASSEMBLY,RAIL 4975JJ2002A 313A RUBBER,SEAT 5040JJ3004A

128A GUIDE ASSEMBLY,RAIL 4975JJ2002A 314A STOPPER,COMP 4620JA3009A

128B GUIDE ASSEMBLY,RAIL 4975JJ2002B 315A COMP BASE ASSEMBLY,STD 3103JJ1001J

128C GUIDE ASSEMBLY,RAIL 4975JJ2003C 317A DRIER ASSEMBLY 5851JJ2002B

128G LINK 4520JJ2001A 318A HOLDER,DRIER 4930JJ3002A

128M GUIDE,AIR 4974JJ2011A 319A TRAY,DRIP 3390JJ0003A

131A BANK ASSEMBLY,ICE 5075JJ1001B 319C GUIDE,FAN 4974JJ1009A

135C COVER,GRILLE FAN 3550JJ2030A 319E BRACKET,MOTOR 4810JJ2005A

136A TRAY ASSEMBLY,DRAWER 3391JJ1011B 323B CONDENSER ASSEMBLY,WIRE 5403JJ1007A

136B TRAY,DRAWER 3390JJ1087A 327A CAP,DRAIN PIPE 5006JA3034A

136F TRAY ASSEMBLY,DRAWER 3391JJ1033B 328A RUBBER,DAMPING 4J03020A

140A SHELF ASSEMBLY,R 5027JJ1014D 328B RUBBER,DAMPING 4J04328A

140B SHELF ASSEMBLY,R 5027JJ1005A 328B RUBBER,DAMPING 4J04328A

140F SHELF ASSEMBLY,NET 5027JJ2005F 329A FAN ASSEMBLY 5901JJ1005A

141A SHELF ASSEMBLY,R 5027JJ1014B 329C FAN ASSEMBLY 5901JJ1004B

141B SHELF ASSEMBLY,R 5027JJ1005A 332A GRILLE ASSEMBLY,FAN 3531JJ1004A

141C SHELF ASSEMBLY,NET 5027JJ2005C 401A CONTROLLER ASSEMBLY(CIRC) 6615JB2005C

141D SHELF ASSEMBLY,R 5027JJ2011B 403A SWITCH,MICRO 6600JB3001B

141E SHELF ASSEMBLY,NET 5027JJ2005D 404A MOTOR ASSEMBLY,REF FAN 4681JK1004A

142A SHELF ASSEMBLY,R 5027JJ1013U 405A BRACKET ASSEMBLY,MOTOR 4811JJ2002A

142B SHELF ASSEMBLY,R 5027JJ1006A 405C RUBBER,MOTOR-F 5040JA2009B

142D SHELF,NET 5026JJ2001L 405F RUBBER,MOTOR-F 5040JA2004B

142E SHELF,NET 5026JJ2001M 406B SWITCH,[PUSH] 6600JB1004A

145A HOLDER,SHELF 4930JJ2003A 406C LEVER,DISPENSER 4510JJ3001A

145B HOLDER,SHELF 4930JJ2004A 409B LAMP,[INCANDESCENT] 6912JK2002C

145D GUIDE,RAIL 4974JJ1012A 409D REFLECTOR,LAMP 3034JJ1002B

145G GUIDE ASSEMBLY,RAIL 4975JJ2005H 410A SOCKET ASSEMBLY,LAMP 6621JK2002D

146D CAN,SERVER 5044JJ1001A 410B BRACKET ASSEMBLY,DOOR 4811JJ2004B

147A BANK,DAIRY 5074JJ1005A 410G CAPACITOR,DRAWING 0CZZJB2003H

147B TRAY,EGG 3390JJ1014A 411A POWER CORD ASSEMBLY 6411JK1006A

147C COVER,BANK 3550JJ1017A 418A HEATER,SHEATH 5300JB1100J

147D TRAY,BUTTER 3390JJ2003A 420A MOTOR(MECH),COOLING 4680JK1001B

149C SHELF ASSEMBLY,R 5027JJ2010B 501A PWB(PCB) ASSEMBLY,MAIN 6871JB1213A

149E SHELF ASSEMBLY,R 5027JJ2009B 501B PWB(PCB) ASSEMBLY,DISPLAY 6871JB3008A

151A TRAY ASSEMBLY,VEGETABLE 3391JJ1019E 501F COVER,PWB 3550JJ1042B

151C KNOB,SHUTTER 4940JJ2003B 503C PWB(PCB) ASSEMBLY,DISPLAY 6871JB2046A

154A COVER,T/V 3550JJ1033A 503D CASE,DISPLAY 3110JJ1005A

155B SUPPORTER ASSEMBLY,COVER-T/V 4981JJ2001A 503E COVER,DISPLAY 3550JJ2032A

158A COVER,LAMP 3550JJ1040A 503G DECO,CONTROL 3806JL1039A

158E COVER,LAMP 3550JJ1051A 600A ICE MAKER ASSEMBLY,KIT 5989JA0002A

160B DECO,TRAY 3806JL2005D 602A HOLDER,BRACKET 4930JA3037A

161A COVER,TRAY 3550JJ2026A 610A COVER,SENSOR 3550JJ2020A

167B GLASS,SHELF 4890JL1002K 611A FILTER ASSEMBLY,WATER 5231JA2006A

168A COVER,MAGIC ROOM 3550JJ1035A 611B FILTER(MECH),HEAD 5230JA2003A

170A TRAY ASSEMBLY,MEAT 3391JJ2004K 611C COVER,FILTER 3550JL1008B

200A DOOR ASSEMBLY,F 3581JJ8018H 611D COVER,FILTER 3550JJ2028A

201A DOOR FOAM ASSEMBLY,F 5433JJ0058M 615A TANK ASSEMBLY,WATER 4839JJ2003A

203A GASKET ASSEMBLY,DOOR 4987JJ1004E 616A TUBE,INJECT 5210JJ2001A

205A BASKET,DOOR 5004JJ1042B 616B TUBE,PE 5210JA3005N

205B BASKET,TILT 5004JJ2005B 616D TUBE,PE 5210JA3004M

205C BASKET,TILT 5004JJ2005A 616E TUBE,PE 5210JA3005N

210A STOPPER,DOOR 4620JJ2005A 616F TUBE,PE 5210JA3004B

210B STOPPER,DOOR 4620JJ2008A 616G TUBE,PE 5210JA3005P

212A HANDLE,F 3650JJ1035A 618A TUBE,INJECT 5210JJ3005B

212G MARK 3846JD1007B 619A VALVE,WATER 5220JA2013A

230A DOOR ASSEMBLY,R 3581JJ8025C 619B COVER,VALVE 3550JJ2024A

231A DOOR FOAM ASSEMBLY,R 5433JJ0033C 619C VALVE ASSEMBLY,WATER 5221JA2011A

233A GASKET ASSEMBLY,DOOR 4987JJ1004F 621B CONNECTOR (MECH),TUBE 4932JA3009A

237A GUIDE,BOTTLE 4974 JJ2012A 621B CONNECTOR (MECH),TUBE 4932JA3009A

237C GUIDE,DRAWER 4974JJ1021A 622A TUBE,INLET 5210JJ3002A

241A COVER,TRAY 3550JL2003H 623A CAP,COVER 5006JJ2004A

241B BASKET,DOOR 5004JJ1021A 623B CAP,COVER 5006JJ2003A

241C BASKET ASSEMBLY,DOOR 5005JJ2017A 623C BAND (MECH) 4770JA3001A

241D BASKET ASSEMBLY,DOOR 5005JJ2020A 623C BAND (MECH) 4770JA3001A

241E BASKET ASSEMBLY,DOOR 5005JJ2018A 625A COVER,TUBE 3550JJ2034A

243A STOPPER,DOOR 4620JJ3006C 627A HOLDER,PIPE 4930JA3054A

244A HANDLE,R 3650JJ1034E 627B HOLDER,BRACKET 4930JA3091A

244B HOLDER,HANDLE 4930JJ2023A 627B HOLDER,BRACKET 4930JA3091A

244C HOLDER,HANDLE 4930JJ2022A 627B HOLDER,BRACKET 4930JA3091A

244J STOPPER,HANDLE 4620JJ3007A 627B HOLDER,BRACKET 4930JA3091A

245A HOLDER,HANDLE 4930JJ2019B 627B HOLDER,BRACKET 4930JA3091A

245B HOLDER,HANDLE 4930JJ2020B 628B VALVE ASSEMBLY,WATER 5221JJ2002A

248E DECO,TRAY 3806JJ2035A 628C VALVE,WATER 5220JB2001A

248F SUPPORTER,HOLDER 4980JJ2005A 628D COVER,VALVE 3550JJ2058A

248N RAIL ASSEMBLY,SLIDE 5219JJ2002A 628E COVER,VALVE 3550JJ2059A

248P RAIL ASSEMBLY,SLIDE 5219JJ2002B 628F TUBE,PE 5210JA3005B

262A HOLDER,BRACKET 4930JA3093A 628G HOLDER,PIPE 4930JA3087A

262A HOLDER,BRACKET 4930JA3093A 629A TANK,WATER 4838JJ1003A

262A HOLDER,BRACKET 4930JA3093A 629B CONNECTOR (MECH),TUBE 4932JA3009B

262B HOLDER,BRACKET 4930JA3093B 629C TUBE,PE 5210JA3004P

262D CLIP 4004JA3002A 700B HANDLE ASSEMBLY,F 3651JJ2010G

262D CLIP 4004JA3002A 700C HANDLE ASSEMBLY,R 3651JJ2017A

276B BUTTON,LEVER 5020JJ3001C 903A COVER,LOWER 3550JJ0006C

278C LEVER,SHUTTER 4510JJ2002A 903B HOLDER,COVER LOWER 4930JJ2021A

279B COVER,DISPENSER 3550JL1005D 903D SENSOR 6500JK1003A

279C DECO,DISPENSER 3806JJ2021D 903E SENSOR 6500JK1004A

281A COVER,HINGE 3550JJ1039C B01 SCREW,DRAWING 1STZJA3004F

281B HINGE ASSEMBLY,U 4775JJ2005A S01 SCREW,DRAWING 1SZZJJ3010A

281C HINGE ASSEMBLY,L 4775JJ2008A S03 SCREW,DRAWING 1SZZJJ3018A

281D COVER,HINGE 3550JJ2043A S07 SCREW,DRAWING 4000W4A003A

281F DECO,DRAIN 3806JJ2020D S22 SCREW,DRAWING 3J05696C

281G COVER,HINGE 3550JJ2044A S24 SCREW,DRAWING 1SZZJA3011B

281H HINGE ASSEMBLY,L 4775JJ2011A S24 SCREW,DRAWING 1SZZJA3011B

282B HINGE ASSEMBLY,C 4775JJ8002C S24 SCREW,DRAWING 1SZZJA3011B

282E CAP,HINGE 5006JJ2001F S24 SCREW,DRAWING 1SZZJA3011B

282F DECO,DUCT 3806JL2006E S28 SCREW,DRAWING 3J05696W

282H CAP,HINGE 5006JJ3004E S38 SCREW,DRAWING 4J00415D

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LRDC22744SW

LOC DESCRIPTION PART NO. LOC DESCRIPTION PART NO.

103A HANDLE,BACK 3650JJ2003E 283B HINGE,L 4774JJ3001A

103B HANDLE,BACK 3650JJ2003A 284D SCREW,DRAWING 1STZJA3004K

103C COVER ASSEMBLY,LOWER 3551JJ1015B 285A GUIDE ASSEMBLY,RAIL 4975JJ2007G