LG LRBN22514WW, LRBN22514SB, LRBN22514ST, REFRIGERATOR Service Manual

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Page 1

CAUTION

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

REFRIGERATOR

SERVICE MANUAL

MODEL:

LRBN22514WW LRBN22514SB LRBN22514ST

Page 2

CONTENTS

- 2 -

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.

SAFETY PRECAUTIONS

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

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

PARTS IDENTIFICATION ...................................................................................... 4

DISASSEMBLY ....................................................................................................... 5

DOOR ................................................................................................................... 5

DOOR SWITCH ...................................................................................................... 6

FAN AND FAN MOTOR ............................................................................................ 6

DEFROST CONTROL ASSEMBLY .............................................................................. 6

LAMP .................................................................................................................... 6

CONTROL BOX-REFRIGERATOR .............................................................................. 6

MULTI DUCT ......................................................................................................... 6

ADJUSTMENT ........................................................................................................ 7

COMPRESSOR ....................................................................................................... 7

PTC-STARTER ....................................................................................................... 7

OLP (OVERLOAD PROTECTOR) ............................................................................... 8

TO REMOVE THE COVER PTC ................................................................................. 8

CIRCUIT DIAGRAM ............................................................................................... 9

TROUBLESHOOTING .............................................................................................11

COMPRESSOR AND ELECTRICAL COMPONENTS ...................................................... 11

PTC AND OLP ........................................................................................................12

OTHER ELECTRICAL COMPONENTS ........................................................................13

SERVICE DIAGNOSIS CHART ..................................................................................14

REFRIGERATION CYCLE .........................................................................................15

REFRIGERATOR PRINCIPLE & REPAIR METHOD OF ICE MAKER .........................17

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ...........................................24

REFRIGERATOR EXPLODED VIEW ........................................................................65

Page 3

1. SPECIFICATIONS

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LRBN22514WW LRBN22514SB LRBN22514ST

Color

White Black Stainless Steel

Capacity

22cuft 22cuft 22cuft

Dimensions Refrigerant Climate Class Control Type Rating

Case Material Door Material

Embo PCM Stainless

Reversible Door Lamp (F) Lamp ( R ) Basket (F) Basket ( R ) Shelf (F) Shelf ( R ) Cover, TV Drawer Vegetable

Tray Meat

1Fix(Full non S/Proof)+2Fix(non S/Proof)

Optibin Crisper+Humidity

Wire (1 Upper + 1 Lower)

Yes Yes

1 (60W) 2 (60W)

1 3

Models

Specification

32.8 (W) x 33.66 (D) x 69.459 (H) R134A (4.2oz)

Temperature(N)

F-control

115/60

EMBO(Normal)

Yes

Page 4

2. PARTS IDENTIFICATION

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

A B

Refrigerator Light

Shelves

Snack Pan

Optibin Crisper Keeps fruits and vegetable fresh and crisp

Triple Twist Ice Tray

F G

Ice Bin

Wire Durabase

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Divider

Dairy Bin

Design-A-Door

Egg Box Refrigerator Door Rack

Freezer Light

Wire Basket

Freezer Wire Door Rack

Page 5

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.

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.

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.

3. DISASSEMBLY

- 5

BOLT

HINGE

HINGE COVER

Figure 1

GASKET

Figure 2

LOWER HINGE

BOLT

Figure 3

DOOR SWITCH

LEAD WIRE

Figure 4

Page 6

3-3 FAN AND FAN MOTOR

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.

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 LAMP

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).

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.

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.

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FAN

BRACKET

MOTOR

GRILLE

FAN MOTOR

Figure 5

GRILLE ASSEMBLY

Figure 6

DEFROST-CONTROL ASSEMBLY

Figure 7

Figure 8

Figure 9

CONTROL BOX

COVER LAMP

Figure 10

Figure 11

Page 7

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

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.

4. ADJUSTMENT

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PTC STARTER

SEALED TERMINAL

COMPRESSOR MOTOR

PTC

OVERLOAD PROTECTOR

Resistance Starter Capacitor Running

Figure 12

Page 8

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 Cover Back M/C.

(2) Remove the screw on Cover PTC.

(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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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)

Figure 13

Page 9

5. CIRCUIT DIAGRAM

Best / Best dispenser

GY: GRIS/GRAY

- 9 -

Page 10

Good / Better

GY: GRIS/GRAY

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Page 11

6. TROUBLESHOOTING

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6-1 COMPRESSOR AND ELECTRIC COMPONENTS

4 5

YES

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

Not open

4.5~9 W

Open

Open or short

YES

Power Source.

No Voltage.

(Reated Voltage ±10%)?

Replace OLP.

Reconnect.

Replace PTC-Starter.

Replace OLP.

Did compressor start?

Compressor is OK

Replace the compressor

Check connection condition.

OLP disconnected?

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

Replace Compressor.

Supply voltage rating with ±10%.

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

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

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

Check resistance of two terminals in PTC-Starter.

Check resistance of two terminals in OLP.

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

Check resistance of Motor Compressor.

Check resistance of PTC-Starter.

Check OLP.

Check starting state.

Page 12

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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 : 6.8 ±30%

The resistance value is 0 (short) or

(open).

Check another electric component.

Replace OLP.

Replace PTCStarter.

Figure 14

Figure 15

Page 13

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Not cooling at all

Poor cooling performance

Compressor doesn't run.

Compressor runs poorly.

Check starting voltage.

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

a. Starting devices b. OLP

c. Compressor coil d. Wiring harness

Low voltage.

Short, open, or broken. Poor contact

or shorted. Coil open or shorted.

Poor contact or shorted.

Poor or broken or open contact.

Shorted.

Lack of capacity.

Replace indicated component.

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

Replace indicated component.

Cause

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.

Wire is open or shorted.

Coil is shorted or open.

Open.

Replace Defrost Heater.

Replace indicated component.

Check wiring circuit.

Check Fan Motor.

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

Check current flow in the Defrost Heater.

6-3 OTHER ELECTRICAL COMPONENTS

Page 14

6-4 SERVICE DIAGNOSIS CHART

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COMPLAINT POINTS TO BE CHECKED REMEDY

Other possible problems:

Check if frost forms in the freezer.

Check Components of the defrosting circuit.

Check the refrigeration system.

Check the Thermistor.

Not defrosting

The system is faulty.

Perform sealed system repair.

Replace the Thermistor.

The operation of the Thermistor is incorrect.

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.

Ice and foods smell unpleasant.

• 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.

• 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.

• 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.

• 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.

Page 15

6-5 REFRIGERATION CYCLE

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Troubleshooting Chart

Leakage Detection

YES

Check if compressor runs.

Check if frost forms in Evaporator.

Observe the discharged amount of Refrigerant.

Inject refrigerant in compressor and check cooling operation.

Clogged by dust. Gas leakage.

Faulty Compressor.

Moisture Clog

Check if oil leaks.

Frost formed normally

Normal amount

None or too much

(Find the leak and repair it)

Frost formed normally

No frost or frost forms in inlet only

Check Compressor

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.

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

•refrigerant and repairing the leak.

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

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

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

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

WHOLE

Freezer

Flowing sound of refrigerant Equal to ambient • Normal discharging of the

CLOG

compartment and

is not heard and frost isn't temperature. • Refrigerant.

Refrigerator don't cool.

formed.

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

temperature. • capillary tube.

COMP- Freezer and Low flowing sound of A little higher • Low pressure at high side RESSION Refrigerator refrigerant is heard and ambient • of compressor due to low

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

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.

CAUSE

TEMPERATURE

OF THE

COMPRESSOR

REMARKS

STATE OF

THE UNIT

STATE OF THE

EVAPORATOR

LEAKAGE

CLOGGED BY DUST

DEFECTIVE

COMPRESSION

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.

Page 16

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NO. ITEMS UNIT STANDARDS PURPOSES REMARKS

General Control of Refrigerating Cycle

Pipe and piping system opening time

Welding

sealed

parts

Refrigeration Cycle

Refrigerant weighing

Drier replacement

Leak check

Min.

Nitrogen pressure

Confirm N2

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.

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 protect oxide scale formation.

To protect moisture penetration.

To remove moisture.

To protect mixing of mineral and ester oils.

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.

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.)

- 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.

Page 17

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.

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER

• Adjusts EJECTOR to Start Position

Power On

with power on.

Start Position

Ice Making

Mode

Harvest

Mode

Park Position

Fill

• Waits until water becomes cold after starting the

Test Mode

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.

ICE MAKER: 5 STEPS

- 17 -

Page 18

7-2 CONTROL METHOD ACCORDING TO FUNCTIONS

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 doesnÕt switch to water-supply mode, but restarts the ice- removing 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.)

Heater

off

30 sec.

10 sec.

Motor

Hall IC

Ice removing completion point

2 ms

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

<fig1. Ice removing process>

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Page 19

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

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

STAGE TIME TO SUPPLY INDICATIONS REMARKS

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.

- 19 -

Page 20

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 doesnÕt 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

7-3 DEFECT DIAGNOSIS FUNCTION

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

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

STAGE ITEMS INDICATOR REMARKS

HEATER

MOTOR

HALL IC (detection

of position) I

VALVE

HALL IC (detection

of full-filled Ice) II

reset

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.

NO DIVISION INDICATOR CONTENTS REMARKS

Normal

Ice-Making

Sensor

malfunction

Ice Maker Kit

malfunction

Mark time to

supply

Mark previous status on TEST mode

None

Cut or short-circuited wire

When ejector blades donÕt reach

park position over 18 minutes

since Harvest Mode starts.

Display switch

operates properly

Make sure that the wire

on each sensor is

connected.

Defects of

HALL IC/MOTOR/

HEATER/RELAY

- 20 -

Page 21

ICE MAKER: 3 STEPS 7-1 OPERATION PRINCIPLE

7-1-1 Operation Principle of Icemaker

Power On

Start Position

Icemaking

Mode

Harvest

Mode

Fill

Park Position

Test 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.

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

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

• 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

Power (On/Off) Switch

- 21 -

Page 22

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 INDICATIONS REMARKS

6 sec.

7 sec.

8 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

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

HEATER

MOTOR

HALL IC

(TRAY)

SOLENOID VALVE

HALL IC (LEVER)

Reset

Return to Status prior to TEST MODE

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.

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

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.

7-3 DEFECT DIAGNOSIS FUNCTION

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

NO DIVISION INDICATOR REMARKS

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

Normal

Icemaking

Sensor

malfunction

Icemaker Kit

malfunction

Note fill times (see previous page)

PROBLEM

None

Open or shorted wire or sensor

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

- 23 -

Display switch

operates properly

Make sure that the wire

on each sensor is

connected.

Check

HALL IC/MOTOR/

HEATER/RELAY

Page 24

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)

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.

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

- 24 -

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

Control range : 32°F ~ 46°F

0°C ~ 8°C

Control range : -6°F ~ 9°F

-21°C ~ -13°C

Control range : 32°F ~ 46°F

0°C ~ 8°C

Control range : -6°F ~ 9°F

-21°C ~ -13°C

Page 25

8-1-4 CONTROL OF FREEZER FAN MOTOR

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.

- 25 -

Closed Open Closed Open

Closed

3 Times 3 Times 3 Times 3 Times

Within 1 min. 1 min.

30 sec 30 sec 30 sec

Freezer Door

or Refrigerator

Door

Buzzer

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.

- 26 -

OPERATING ORDERS

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

Initial power on

POWER

in 1/2 second in 1/2 second

Total load

OFF

COMP

Freezer FAN

in 7 minute

in 1/2 second

COMP

Freezer FAN

POWER

COMP

Freezer FAN

Defrosting

heater ON

Defrosting

heater OFF

in 1/2 second

in 1/2 second in 1/2 second

in 10 second

Page 27

8-1-13 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 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

- 27 -

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

NO ITEM

ERROR CODE

CONTENTS REMARKS

Failure of freezer sensor

Failure of Refrigerator sensor

Failure of defrost sensor

Failure of defrost mode

Failure of BLDC FAN MOTOR at freezing compartment.

Cut or short circuit wire

When defrost sensor

doesnÕt reach 8¡C within 2

hours after starting defrost.

If there is no fan motor

signal For more than

65sec. in Operation fan

motor

Inspect Connecting wires

on each sensor

Snapping of defrost heater

or Temperature fuse, pull-

out of Connector (indicated

minimum 2 Hours after

failure occurs)

Poor motor, hooking to

Wires of fan, contact of

structures to fan, snapping

or short circuit of Lead wire

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.

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.

* 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 -

MODE MANIPULATION CONTENTS REMARKS

TEST1

TEST2

Reset

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.

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:

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 -

PART VA 1 CE 3 CE 4 CE 5

VOLTAGE 115 Vac 12 Vdc 15.5 Vdc 5 V

Page 30

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 -

Page 31

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

1. Load Drive Condition Check

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.

- 31 -

FREEZER DOOR

SWITCH

REFRIGERATOR

DOOR SWITCH

LOAD TYPE

COMP

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

1V or below

12V

DEFROSTING

HEATER

LAMP

TCM

POWER MODE

(OPTIONAL)

VALVE

(DISPENSER

MDL)

Measurement Location (IC6)

Condition

OFF

part part part

MOTOR OFF 2V or less 0V 5V

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

a b

G5SB-14

Page 32

3. Buzzer Drive Condition Check

4. Open Door Detection Circuit Check

- 32 -

OFF

IC1 ( ) 0 V

Measurement Location

Condition

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~)

(PIN NO.63 & PIN NO.8)

Closed 5 V

Open 0 V

Freezer/ Refrigerator Door

Measurement

Location

FREEZER DOOR SWITCH

REFRIGERATOR DOOR SWITCH

Tone (Ding~Dong~) when the button on

the display is pushed.

Alarm for open door

(beep-beep-beep)

Page 33

8-2-5 Temperature Sensor Circuit

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:

- 33 -

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

SHORT-CIRCUITED

OPEN

Freezer Sensor POINT Voltage

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

Defrosting Sensor POINT Voltage

FREEZER-SENSOR

REFRIGERATOR-SENSOR

DEFROST-SENSOR

Page 34

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 Dispenser Input/LED Output Circuit

- 34 -

PUMP SWITCH

1 2 3

Page 35

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

1. Refrigerator Temperature Compensation

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

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 -

Refrigerator

Resistance Temperature Remark

(RCR) Compensation

180 K +2.5°C Compensation by

56 K +2.0°C

raising the

33 K +1.5°C

temperature

18 K +1.0°C 12 K +0.5°C 10 K 0 °C

Standard Temperature

8.2 K -0.5°C Compensation by

5.6 K -1.0°C

lowering the

3.3 K -1.5°C

temperature

2 K -2.0°C

470 -2.5°C

Revised resistance

470 2k 3.3k 5.6k 8.2k 10k 12k 18k 33k 56k 180k

Present resistance

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

470 change Up Up Up Up Up Up Up Up Up Up

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

2k Down Change Up Up Up Up Up Up Up Up Up

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

3.3k Down Down Change Up Up Up Up Up Up Up Up

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

5.6k Down Down Down Change Up Up Up Up Up Up Up 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

8.2k 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) 10k Down Down Down Down Down Change Up Up Up Up Up

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

12k Down Down Down Down Down Down Change Up Up Up Up

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

18k Down Down Down Down Down Down Down Change Up Up Up

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

33k Down Down Down Down Down Down Down Down Change Up Up

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

56k Down Down Down Down Down Down Down Down Down Change Up

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

180k Down Down Down Down Down Down Down Down Down Down Change

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).

Page 36

8-2-9 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 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 -

220 1 2W

R25

Page 37

- 37 -

8-3 RESISTANCE SPECIFICATION OF 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.

TEMPERATURE DETECTED RESISTANCE OF FREEZER

RESISTANCE OF REFRIGERATOR &

BY SENSOR SENSOR

DEFROST SENSOR & ROOM SENSOR

- 20 ûC 22.3 K 77 K

- 15 ûC 16.9 K 60 K

- 10 ûC 13.0 K 47.3 K

- 5 ûC 10.1 K 38.4 K 0 ûC 7.8 K 30 K

+ 5 ûC 6.2 K 24.1 K + 10 ûC 4.9 K 19.5 K + 15 ûC 3.9 K 15.9 K + 20 ûC 3.1 K 13 K + 25 ûC 2.5 K 11 K + 30 ûC 2.0 K 8.9 K + 40 ûC 1.4 K 6.2 K + 50 ûC 0.8 K 4.3 K

Page 38

- 38 -

8-4 TROUBLESHOOTING

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

POWER SOURCE 1.

The whole DISPLAY

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

is poor.

LED/SEVEN SEGMENT

REFRIGERATOR. REFRIGERATOR DOOR IS

DISPLAYis off.

OPEN and check display.

2. DISPLAY LED/

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

SEVEN SEGMENT

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

DISPLAY operates the MAIN PWB CONNECTOR. is poor.

abnormally CONNECTOR. TRANS FUSE is open. Replace TRANS.

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

operate.

(forced COOLING).

blocked.

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

is poor. black wire of the MAIN PWB

CONNECTOR (CON2).

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.

FREEZER 1. If FANMOTOR 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

connection of the black wire

of the MAIN PWB

CONNECTOR (CON2).

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

is normal. sticking on the EVAPORATOR . is poor .

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

is normal. of the Refrigerator poor.

SENSOR.

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

the door is closed.

Page 39

- 39 -

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

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

TEMPERATURE isn ormal. 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.

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.

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

door is closed.

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

poor. (forced DEFROSTING).

TEMPERATURE FUSE Replace TEMPERATURE

disconnection. FUSE.

Connection is poor. Check EVAPORATOR

connection and wire of MAIN

PWB CONNECTOR.

DEFROST-SENSOR is poor. Replace DEFROST-SENSOR.

HEATER RELAY is poor. Replace RY3 of MAIN PWB.

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

blocked. Check HEATER PLATE

resistance.

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

DEFROSTING. SENSOR is connected. DEFROST-SENSOR.

Make sure that FREEZER /

DOOR does not close Reassemble DOOR.

REFRIGERATOR DOOR is closed.

properly. Replace GASKET.

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

- 42 -

SW106

Dispenser Model

Best Model

Page 43

8-6 PWB DIAGRAM

8-6-1 PWB Main Assembly

- 43 -

FREEZER DOOR SWITCH

REFRIGERATOR DOOR SWITCH

PWB ASSEMBLY

G5SB-14

RY4

RY5

Page 44

- 44 -

FREEZER SENSOR

FREEZER DOOR SWITCH

REFRIGERATOR DOOR SWITCH

REFRIGERATOR SENSOR

DEFROST SENSOR

220 1/2W

Page 45

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.

9. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

- 45 -

BETTER / GOOD MODEL

ADJUST

WARMER

REFRIGERATOR TEMP FREEZER TEMP

4 IS RECOMMENDED

COLDER

EXPRESS

FREEZING

ADJUST

WARMER

4 IS RECOMMENDED

COLDER

Page 46

9-1-5 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 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.

3. Defrosting stops if the sensor temperature reaches 46.4¡F(8¡ C) or more. If the sensor doesnÕt reach 46.4¡F(8¡ C) in 2 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function, 7-1-9.)

4. Defrosting wonÕt function if its sensor is defective (wires are cut or short circuited)

9-1-8 Electrical Parts Are Turned On Sequentially

- 46 -

Closed Open Closed Open

Closed

3 Times 3 Times 3 Times 3 Times

Within 1 min. 1 min.

30 sec 30 sec 30 sec

Freezer Door

or Refrigerator

Door

Buzzer

OPERATING ORDERS

Temperature of Defrosting 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)

Reset to normal operation from TEST MODE

Initial power on

POWER

in 1/2 second in 1/2 second

Total load

OFF

COMP

Freezer FAN

in 7 minute

in 1/2 second

COMP

Freezer FAN

POWER

COMP

Freezer FAN

Defrosting

heater ON

Defrosting

heater OFF

in 1/2 second

in 1/2 second in 1/2 second

in 10 second

Page 47

9-1-9 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 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

- 47 -

? Defect code signs Defect code signs

ADJUST

WARMER

REFRIGERATOR TEMP FREEZER TEMP

4 IS RECOMMENDED

COLDER

EXPRESS

FREEZING

ADJUST

WARMER

4 IS RECOMMENDED

COLDER

NO ITEM

ERROR CODE

CONTENTS REMARKS

→

Failure of freezer sensor

Failure of Refrigerator sensor

Failure of defrost sensor

Poor of defrost

Cut or short circuit wire

2hours later After starting defrost, If

sensor doesnÕt be over

46¡F (8¡C)

Inspect Connecting

wires on each sensor

Snapping of defrost

heater or Temperature

fuse, pull-out of

Connector (indicated

minimum 2 Hours

after failure occurs)

All off

LED OFF LED ON

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.

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:

* 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 -

MODE MANIPULATION CONTENTS REMARKS

TEST1

TEST2

Reset

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.

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:

- 49 -

PART VA 1 CE 2 CE 1 CE 4

VOLTAGE 115 Vac 12 Vdc 15.5 Vdc 5 V

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

1. Load Drive Condition Check

G5SB-14

LOAD TYPE

COMP

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

1V or below

12V

DEFROSTING

HEATER

LAMP

FREEZER

FAN MOTOR

(HIG RPM)

FREEZER

FAN MOTOR

(LOW RPM)

Measurement Location (IC4)

Condition

OFF

- 51 -

RY5

Page 52

2. Buzzer Drive Condition Check

3. Open Door Detection Circuit Check

- 52 -

OFF

IC1 ( ) 0 V

Measurement Location

Condition

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~)

(PIN NO.31 & PIN NO.30)

Closed 5 V

Open 0 V

Freezer/ Refrigerator Door

Measurement

Location

Tone (Ding~Dong~) when the button on

the display is pushed.

Alarm for open door

(beep-beep-beep)

Page 53

9-2-5 Temperature Sensor Circuit

- 53 -

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

SHORT-CIRCUITED

OPEN

Freezer Sensor POINT Voltage

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

Defrosting Sensor POINT Voltage

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

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

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 -

Refrigerator

Resistance Temperature Remark

(RCR) Compensation

180 K° +2.5¡C Compensation by

56 K° +2.0¡C

raising the

33 K° +1.5¡C

temperature

18 K° +1.0¡C 12 K° +0.5¡C 10 K° 0 ¡C

Standard Temperature

8.2 K° -0.5¡C Compensation by

5.6 K° -1.0¡C

lowering the

3.3 K° -1.5¡C

temperature

2 K° -2.0¡C

470 ° -2.5¡C

Revised resistance

470° 2k° 3.3k° 5.6k° 8.2k° 10k° 12k° 18k° 33k° 56k° 180k°

Present resistance

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

470° change Up Up Up Up Up Up Up Up Up Up

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

2k° Down Change Up Up Up Up Up Up Up Up Up

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

3.3k° Down Down Change Up Up Up Up Up Up Up Up

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

5.6k° Down Down Down Change Up Up Up Up Up Up Up 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

8.2k° 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) 10k° Down Down Down Down Down Change Up Up Up Up Up

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

12k° Down Down Down Down Down Down Change Up Up Up Up

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

18k° Down Down Down Down Down Down Down Change Up Up Up

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

33k° Down Down Down Down Down Down Down Down Change Up Up

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

56k° Down Down Down Down Down Down Down Down Down Change Up

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

180k° Down Down Down Down Down Down Down Down Down Down Change

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).

Page 56

9-2-8 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 corresponding function indication LED DISPLAY. The drive type is the scan type.

- 56 -

150J

Page 57

- 57 -

9-3 RESISTANCE SPECIFICATION OF 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.

TEMPERATURE DETECTED RESISTANCE OF FREEZER

RESISTANCE OF REFRIGERATOR &

BY SENSOR SENSOR

DEFROST SENSOR & ROOM SENSOR

- 20 ûC 22.3 K? 77 K?

- 15 ûC 16.9 K? 60 K?

- 10 ûC 13.0 K? 47.3 K?

- 5 ûC 10.1 K? 38.4 K? 0 ûC 7.8 K? 30 K?

+ 5 ûC 6.2 K? 24.1 K? + 10 ûC 4.9 K? 19.5 K? + 15 ûC 3.9 K? 15.9 K? + 20 ûC 3.1 K? 13 K? + 25 ûC 2.5 K? 11 K? + 30 ûC 2.0 K? 8.9 K? + 40 ûC 1.4 K? 6.2 K? + 50 ûC 0.8 K? 4.3 K?

Page 58

- 58 -

9-4 TROUBLESHOOTING

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

POWER SOURCE 1.

The whole DISPLAY

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

is poor.

LED/SEVEN SEGMENT

REFRIGERATOR. REFRIGERATOR DOOR IS

DISPLAYis off.

OPEN and check display.

2. DISPLAY LED/

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

SEVEN SEGMENT

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

DISPLAY operates the MAIN PWB CONNECTOR. is poor.

abnormally CONNECTOR. TRANS FUSE is open. Replace TRANS.

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

operate.

(forced COOLING).

blocked.

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

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

donÕt press the KEY and poor.

wait. THE CONNECTING WIRE Check the connection of the

is poor. black wire of the MAIN PWB

CONNECTOR (CON2).

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.

FREEZER 1. If FANMOTOR 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

connection of the black wire

of the MAIN PWB

CONNECTOR (CON2).

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

is normal. sticking on the EVAPORATOR . is poor .

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

is normal. of the Refrigerator poor.

SENSOR.

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

the door is closed.

Page 59

- 59 -

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

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

TEMPERATURE isn ormal. 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.

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.

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

door is closed.

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

poor. (forced DEFROSTING).

TEMPERATURE FUSE Replace TEMPERATURE

disconnection. FUSE.

Connection is poor. Check EVAPORATOR

connection and wire of MAIN

PWB CONNECTOR.

DEFROST-SENSOR is poor. Replace DEFROST-SENSOR.

HEATER RELAY is poor. Replace RY3 of MAIN PWB.

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

blocked. Check HEATER PLATE

resistance.

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

DEFROSTING. SENSOR is connected. DEFROST-SENSOR.

Make sure that FREEZER /

DOOR does not close Reassemble DOOR.

REFRIGERATOR DOOR is closed.

properly. Replace GASKET.

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

9-6-1 PWB Main Assembly

- 63 -

G5S-1A

RY5

Page 64

- 64 -

Page 65

#EV#

10. EXPLODED VIEW

CASE PARTS

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

103B

281A

619B

S38

328A

314A

411A

307A

312A

501A

318A

420A

105A

317A

308A

319A

410G

329C

501F

304A

309A

623H

327A

310A

103A

323B

282H

282E

106A

305B

903E

903D

610A

249D

305C

610A

145B

283B

284D

281B

406B

125D *

249C

106A

409B

158E

405A

S22

B01

503D

158A

B01

283D

503C

409B

282B

282C

284D

106B

S01

410A

503E

418A

301A

409D

120B

405F

503G

503F

404A

405C

282F

145A

401A

405B

319E

329A

319C

305C

305B

105F

-65-

315A

135C

903B

284B

284E

332A

903B

903A

103C

Page 66

#EV#

FREEZER PART

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

249E

249G

125A

145D

131A

145G

145F

136B

145E

248F

136C

-66-

Page 67

#EV#

REFRIGERATOR PARTS

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

S24

140E

143B

143A

S24

128B

142E

143F

140B

142D

140D

S24

140E

S24

128A

140B

170A

143E

S24

140D

103E

167B

-67-

103E

151A

154A

151A

155B

151C

Page 68

#EV#

DOOR PARTS

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

LRBN22514WW LRBN22514SB

230A

241A

233A

241B

281E

212F

241C

241E

212J

231A

212G

LRBN22514ST

286A

S03

212G

244B

244E

244A

241D

205D

281E

212J

244H

212F

S02 *

700C

203A

244P *

200A

201A

243A

S27

286A

282Z

286A

243A

283F

S03

245B

244C

212J

700C

700B

245A

212A

286A

243A

283F

S27

-68-

Page 69

P/No. 3828JL8071A MARCH, 2009

LG LRBN22514WW, LRBN22514SB, LRBN22514ST, REFRIGERATOR Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual