LG LRSPC2661xx Service Manual

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Page 1

CAUTION

PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS BOOK BEFORE SERVICING OR OPERATING THE REFRIGERATOR.

MODEL: LRSPC2661T

COLOR: TITANIUM

REFRIGERATOR

SERVICE MANUAL

http://biz.lgservice.com

Ref. No. GR-D267DTU

Page 2

WARNINGS AND PRECAUTIONS FOR SAFETY ................................................................................................................ 3

SPECIFICATIONS................................................................................................................................................................... 4

PARTS IDENTIFICATION....................................................................................................................................................... 5

HOW TO INSTALL THE REFRIGERATOR............................................................................................................................ 6

HOW TO ADJUST DOOR HEIGHT OF THE REFRIGERATOR.......................................................................................... 6

HOW TO INSTALL WATER PIPE......................................................................................................................................... 7

HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO THE ICEMAKER........................................................... 8

COOLING CYCLE AND REFRIGERANT............................................................................................................................. 10

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS....................................................................................... 12

COMPRESSOR (RECIPROCATING TYPE)...................................................................................................................... 12

OVER LOAD PROTECTOR............................................................................................................................................... 12

POSITIVE TEMPERATURE COEFFICIENT (PTC)............................................................................................................ 12

SWITCH (DOOR, HOME BAR, DISPENSER)................................................................................................................... 13

MOTOR.............................................................................................................................................................................. 14

SOLENOID......................................................................................................................................................................... 14

HEATER............................................................................................................................................................................. 15

VALVE................................................................................................................................................................................. 17

ICEMAKER AND DISPENSER OPERATION PRINCIPLE AND REPAIR METHOD........................................................... 18

MICOM FUNCTION .............................................................................................................................................................. 24

EXPLANATION FOR MICOM CIRCUIT .............................................................................................................................. 32

CIRCUIT................................................................................................................................................................................ 52

PROBLEM DIAGNOSIS ....................................................................................................................................................... 53

PROBLEM SHOOTING...................................................................................................................................................... 53

FAULTS .............................................................................................................................................................................. 63

COOLING CYCLE HEAVY REPAIR................................................................................................................................... 80

HOW TO DEAL WITH CLAIMS.......................................................................................................................................... 87

HOW TO DISASSEMBLE AND ASSEMBLE(REFRIGERATOR SECTION) ....................................................................... 92

DOOR................................................................................................................................................................................. 92

HANDLE............................................................................................................................................................................. 93

DEODORIZER.................................................................................................................................................................... 93

SHROUD, GRILLE FAN..................................................................................................................................................... 94

CONTROL BOX, R............................................................................................................................................................. 94

CASE PWB......................................................................................................................................................................... 94

ICEMAKER ASSEMBLY..................................................................................................................................................... 95

DISPENSER....................................................................................................................................................................... 96

WATER TANK AND WATER LINE...................................................................................................................................... 97

DIGITAL SECTION LAYOUT................................................................................................................................................ 98

DIGITAL PARTS MANUAL................................................................................................................................................. 101

TROUBLESHOOTING FOR THE DIGITAL FUNCTION SECTION................................................................................... 122

EXTERNAL EXTENSION PORT ........................................................................................................................................ 131

HOW TO DISASSEMBLE AND ASSEMBLE(DIGITAL SECTION) ................................................................................. 132

EXPLODED VIEW .............................................................................................................................................................. 136

DIGITAL SECTION COMPONENTS .................................................................................................................................. 144

REPLACEMENT PARTS LIST .......................................................................................................................................... 146

CONTENTS

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Page 3

Please observe the following safety precautions in order to safely and properly use the refrigerator, to avoid hazards, and prevent accidents during repair.

1. Avoid the risk of electric shock. Disconnect power cord from wall outlet and wait for more than three minutes before replacing PWB parts. Shut off the power whenever replacing and repairing electric components.

2. When connecting power cord, make sure that the power cord has been disconnected from the wall outlet for at least five minutes.

3. Check for damage to the power cord and plug. If the power cord or plug is damaged, it could cause a fire or electric shock.

4. The refrigerator should have its own individual electrical outlet. Overloading any outlet can cause a fire.

5. Please make sure the outlet is properly grounded, particularly in a wet or damp area.

6. Use standard electrical components when replacing parts.

7. Make sure water connection is correctly engaged. Remove dust and foreign materials from the housing and connecting parts.

8. Do not fray, damage, machine, heavily bend, yank, or twist the power cord.

9. Check for evidence of moisture intrusion in the electrical components. Replace the parts or mask them with insulation tape if moisture intrusion is evident.

10. Do not touch the Icemaker with hands or tools to confirm the operation of geared motor.

11. Do not let the customer repair, disassemble, or

reconstruct the refrigerator for themselves. Servicing carries the risk of electric shock, fire and other hazards.

12. Do not store hazardous materials such as ether, benzene, alcohol, chemicals, gas, or medicine in the refrigerator.

13. Do not put flower vases, cups, cosmetics, chemicals, etc., or container with fall of liquid on the top of the refrigerator.

14. Do not put glass bottles full of liquid into the freezer. The contents could freeze and break the glass bottles.

15. When scrapping the refrigerator, please disconnect the door gasket first, and scrap the refrigerator in a location where no children have access.

WARNINGS AND PRECAUTIONS FOR SAFETY

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Page 4

SPECIFICATIONS

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ITEMS SPECIFICATIONS

DIMENSIONS 960(W)X915(D)X1795(H) mm

(37

in.)

NET WEIGHT 169kg (372

/2 lbs.) COOLING SYSTEM Fan Cooling TEMPERATURE CONTROL Micom Control DEFROSTING SYSTEM Full Automatic

Heater Defrost INSULATION Cyclo-Pentane COMPRESSOR PTC Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a (210g) (6

/8 oz.) LUBRICATING OIL FREOL @15G (330 cc) DRIER 1Ø0.83 CAPILLARY TUBE MOLECULAR SIEVE XH-7

ITEMS SPECIFICATIONS

FIRST DEFROST 5 - 6 Hours DEFROST CYCLE 13 - 15 Hours DEFROSTING DEVICE Heater, Sheath-AL

Heater, Sheath-ML Heater, Drain

ANTI SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater Frame LCD Heater

ANTI-FREEZING HEATER Chilled Room Duct Heater

Damper Heater

Tube Inject Heater FREEZER LAMP 60W (1 EA) REFRIGERATOR LOWER LAMP 60W (1 EA) REFRIGERATOR UPPER LAMP 30W (2 EA) DISPENSER LAMP 15W (1 EA)

/16)

/2)

1790 (70

1750 (68

1072 (201/4)

960 (37

/16)

1795 (70

/16)

/2)

750 (29

801 (31

875 (34

/4)

/16)

915 (36

1407 (55

Page 5

PARTS IDENTIFICATION

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Icemaker

Bank Ice

Cover, Lamp -F

Shelf F

Drawer

Supporter

Basket

Cover Lower

Dairy Product Corner

Control Box, R

Cover, Lamp-R(U) Cantilever Shelf

Egg Box Snack Corner

Cover, Lamp-R(L) Fruit/Vegetable

Drawer Vegetable/Chilled

Drawer Guide Bottle

Adjust Screw (right)

Supporter Basket

Cover

Adjust Screw

(Ieft)

Slide Out Cantilever Shelf

Guide Bottle

Vegetable/Chilled Drawer Convertible Switch

Wine Rack

Optional Part

Cover PWB

Back

Handle

Frame

Display

Dispenser

Lamp

Remote Control

Receiver Camera Mic

Ice & Water

Dispenser

Button

Monitor

Management Switch

Reset Switch

Screen ON/OFF Switch

Page 6

1. How to Adjust Door Height of Refrigerator

■ Make the refrigerator level first. (If the refrigerator is not installed on a level floor, the height of freezer and refrigerator door may not be the same.)

1. If the height of freezer door is lower than the refrigerator door:

2. If the height of freezer door is higher than the refrigerator door:

Insert a driver  into the groove  of adjusting screw and rotate driver in arrow direction (clockwise) until the refrigerator becomes horizontal.

HOW TO INSTALL REFRIGERATOR

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Adjusting Screw

Driver

Height Difference

Height

Difference

Page 7

2. How to Install Water Pipe

■ Install Water Filter (Applicable to some models only)

■ Before Installing water filter

1. Before installing the filter, take out the top shelf of the refrigerator after tilting it to the direction () and lifting it to the direction () and move it to the lower part.

2. Remove the lamp cover by pressing the protrusion under the cover and pulling the cover to the front.

■ Installing water filter

1. Initial installation of water filter Remove the filter substitute cap by turning it counterclockwise () by 90 degrees and pulling it down.

Note : Keep it for later use when you do not use the filter.

Remove the red cap from the filter and attach the sticker. Insert the upper part of the filter () after aligning with the guideline marked on the control box, and fasten it by turning it clockwise by 90 degrees.

Note : Verify that the guideline and the fastening indication

line are aligned.

2. Replacement of water filter

While holding the lower part of the filter, turn it counterclockwise () by 90 degrees and pull it down.

Note : Verify that the guideline and the loosening indication

line are aligned.

■ After installing water filter

Reassemble the lamp cover and the top shelf of the refrigerator. To place the top shelf of the refrigerator, raise the front part of the shelf a bit so that the hook of the shelf fits into the groove. In order to clean the water filter system, drain water for about 3 min.

Note : Then open the door of the refrigerator and check for

water dripping on the shelf under the filter.

HOW TO INSTALL REFRIGERATOR

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Control box

Aligning with the guide line and the fastening indication line

Control box

Aligning with the guide line and the loosening indication line

Removal of red cap

Adhesive Sticker

Substitute cap

Page 8

3. How to Control the Amount of Water Supplied to Icemaker.

3-1. Verify the amount of water supplied to the Icemaker.

1. Pull out the ice bin in the upper part of the freezer compartment.

Caution : • Do not put hands or tools into the chute to

confirm the operation of geared motor. (Doing so may damage refrigerator or cause injury to hands.)

• Check the operation of motor by its operation noise.

2. Apply electricity after connecting water pipe.

1) Press test switch under the Icemaker for two seconds as shown below.

2) The bell rings(ding~dong), ice tray rotates, and water comes out from the Icemaker water tube.

3) The water shall be supplied two or three times into the tray. The amount of water supplied for each time is small. Put a water container under the ice tray and press test switch.

4) When ice tray rotates, the water in it will spill. Collect the spilled water and throw it into the sink.

5) When ice tray has finished rotation, water comes out from the water tube. Confirm the amounts of water in the ice tray. (Refer to fig. The optimum amount of water is 110cc[6.7in

])

* It is acceptable if the adjusted level of water is a bit smaller than optimum level.

HOW TO INSTALL REFRIGERATOR

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Test Switch

Confirm the amount

of water

Icemaker

Too much Too small

Optimum level

Page 9

3-2. Control the amount of water supplied to the

Icemaker.

Caution : • Unplug the power cord from the wall outlet and

wait for more than three minutes before disconnecting PWB cover as 310V is applied in the control panel.

1. Disconnect PWB cover from the upper part of the refrigerator.

2. Adjust the amount of water supplied by using the DIP switch.

■ Water Supplying Time Control Option

1) The water supplying time is set at five seconds when the refrigerator is delivered.

2) The amount of water supplied depends on the setting time and the local water pressure.

3) If the ice cubes are too small, increase the water supplying time. This happens when too little water is supplied to the tray. (eg: change 5 to 5.5 seconds)

4) If ice cubes stick together, decrease the water supplying time. This happens when too much water is supplied into the ice tray. (eg: change 5 to 4.5 seconds)

Caution : When adjusting the amount of water supplied,

adjust in small increments. Otherwise the water may spill over.

3. When adjustment of control switch for the amount of water supplied is complete, check the level of water in the ice tray.

HOW TO INSTALL REFRIGERATOR

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SWITCH NO Water Suppling

Switch1 Switch2 Switch3 Time

OFF OFF OFF 6 Sec.

ON OFF OFF 4 Sec.

OFF ON OFF 4.5 Sec.

ON ON OFF 5 Sec.

OFF OFF ON 5.5 Sec.

ON OFF ON 7 Sec.

OFF ON ON 8 Sec.

ON ON ON 9 Sec.

(+) Driver

Switch ON Switch OFF

PWB(PCB) Assembly

Confirm the amount

of water

Optimum level

Page 10

1. Cooling Cycle (Cooling Principles/Refrigerant Gas Circulation)

1-1. Principles of cooling cycle

Cooling is an operation by which the temperature of a unit is maintained below the ambient temperature. For the cooling operation, there must be an insulated space, the refrigerant (R134a) to absorb heat in the space, and a refrigerant circulation system including a compressor, condenser, evaporator, etc. to conduct phase transformation of the refrigerant.

1-2. Refrigerant gas circulation

 Compressor  Wire Condenser  Hot Line (Freezer Compartment)  Hot Line (Refrigerator Compartment)  Drier  Capillary Tube  Evaporator  Suction Pipe  Cooling Fan

1-3. Cool Air Circulation

Freezer Compartment Refrigerator Compartment

COOLING CYCLE AND REFRIGERANT

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Page 11

2. Description of each component

NOTE : • The pressure of refrigerant changes from high to low at capillary tube outlet. The low pressure refrigerant rushes

into the evaporator inlet and makes noise.

• When low pressure liquid refrigerant evaporates in the evaporator, evaporation takes place in the entire evaporator from inlet to outlet. When this occurs, noise may sometimes occur. Noise depends on the amount of evaporation so that noise may or may not occur. This is not a problem.

3. Containing refrigerant and foaming agent

* ODP: Ozone Depletion Index(relative value based on CFC11 as 1.0)

GWP: Globe Warmth Index(relative value based on CO

2 as 1.0)

COOLING CYCLE AND REFRIGERANT

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Refrigerant Characteristics ODP GWP Remarks

Cyclo-Pentane It does not contain chlorine which depletes ozone layer. 0 8 Foaming Agent (C5H10) Its GWP is almost zero. Pollution-free foaming agent.

R134a It does not contain chlorine which depletes ozone layer. 8 1200 Refrigerant (HFC-134a) Its GWP is also very low compared with that of R12

(GWP:15,300).

NO. NAME FUNCTION REFRIGERANT (IN AND OUTLET)

Compresses refrigerant from low(0 kg/cm2) to high pressure(8-12 kg/cm

)

Refrigerant transforms from high pressure gas to high pressure liquid in condenser. This phase transfromation dissipates heat.

Drier absorbs moisture in the system. (moisture absorption equipment)

Long and narrow tubes. Refrigerant pressure drops rapidly as refrigerant passes through the tube.

Refrigerant transforms from low pressure liquid to low pressure gas. This phase change absorbs heat from the surrounding air and food. This enables foods to freeze in the freezer and to stay fresh in the refrigerator compartment.

Connects evaporator and compressor.

LOW PRESSURE GAS(0 kg/cm

)

TEMP(30°C[86°F])

HIGH PRESSURE GAS(8-12 kg/cm

) TEMP(80[176°F]120°C[248°F])

HIGH PRESSURE LIQUID(8-12 kg/cm

) TEMP(40[104°F]60°C[140°F])

LOW PRESSURE LIQUID(0 kg/cm

)

TEMP(-27°C[-17°F])

LOW PRESSURE GAS(0 kg/cm

)

TEMP(-27°C[-17°F])

→ HIGH PRESSURE

GAS(8-12 kg/cm

) TEMP(80[176°F]120°C[248°F])

→ HIGH PRESSURE

LIQUID(8-12 kg/cm

) TEMP(40[104°F]60°C[140°F])

→ LOW PRESSURE

LIQUID(10 kg/cm

)

TEMP(-27°C[-17°F])

→ LOW PRESSURE

GAS(0 kg/cm

)

→ LOW PRESSURE

GAS(0 kg/cm2) TEMP(30°C[86°F])

COMPRESSOR

CONDENSER

DRIER

CAPILLARY

TUBE

EVAPORATOR

SUCTION PIPE

Page 12

1. Compressor(Reciprocating Type)

The compressor consists of a piston and motor. The motor pushes piston and piston which compresses refrigerant gas to a high pressure. Lubricants are sealed in the compressor to a accelerate cooling and lubricate compressor. Low pressure refrigerant is distributed through the entire compressor but high pressure refrigerant gathers around outer cooling plate through the outlet pipe.

NOTE : • A replacement compressor for service is full of

nitrogen gas and sealed with rubber when it is delivered. This is to protect oxidation and to prevent the intrusion of moisture into the compressor. When bushing seals are removed, nitrogen gas shall rush out, producing noise. This is normal. If the nitrogen gas was leaked out. the compressor may be corroded and should not be used.

• Compressor should be protected from impact during transportation or storage to prevent eccentricity of motor axis.

2. Over Load Protector

Over load protector relay protects motor by breaking circuits when temperature rises and excess current flows in the compressor. It consists of bimetal element and heater. Bimetal element defroms when temperature rises and heater emits heat when over current flows. This relay is mounted on the outer surface of compressor and senses temperature of compressor. This relay is connected to the compressor motor in series. When operating contact point of bimetal comes off from fixed contacting point, over load protector relay breaks circuit. When the temperature of compressor lowers and the heater cools, the operating contact points move back to the fixed contact point and the compressor works again after 3 or 5 minutes.

NOTE : • Over load protector relay detects temperature

and current at the same time. It operates when the temperature of compressor is high even there is no current. It shall also operates when over current flows even the temperature of compressor is low. It is also possible that both high temperature and over current shall operate relays at the same time.(Current is more effective than temperature.)

• Over load protector relay shall operate again if the surface temperature and current of compressor repeats a breach of the threshold values even though the heater is cools down after 3 or 5 minutes of downtime. Customer may claim that the relays repeated on and off operation as the temperature remained constant. In this case, switch off the power and let the compressor cool down fully. If the relay malfunctions after this, replace it with a new one.

3. Positive Temperature Coefficient (PTC)

Starter is connected to auxiliary winding in series and accelerates compressor starting. It is located on outer case of compressor with relays. Previously, the starter was a contact point type. but it is now generally a PTC element type. PTC stands for positive temperature coefficient and it has a starting value of resistance(e.g. 22 Ω). It is an element whose resistance becomes infinitive when current flows. The starting principles of a single-phase induction motor and simple alternating current circuit must be fully understood in order to understand the roles of starter. The circuit is shown below.

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 12 -

CS CR

P.T.C

Piston

Motor Spring

Iubricant

Page 13

4. Switch(Door, Dispenser)

1. Function

1) Door switches in freezer and refrigerator compartments turns on and off the lamps when the freezer and refrigerator doors are opened and closed. They also switch the fans in the freezer compartment on and off at the same time.

2) Home bar switch turns on and off the lamp in the refrigerator compartment when home bar is open and close.

3) Dispenser switch turns the dispenser lamp on and off when dispensing ice/water.

2. Operation Principles and Characteristics

3. Troubleshooting

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 13 -

Classification Door Switch Dispenser Switch

Shapes

Circuits

Troubles (Parts)

Symptoms Check Measures

- The switch points make contact depending on wheather one of the doors is opened or closed. These control the lamps in the refrigerator and the freezer compartments.

- The dispenser bushing button is pressed by the switch lever. This turns on the dispenser lamp.

Operation Principles /Charact

-eristics

Lamp is not on when door is open. (door switch)

1. Dispenser lamp is not on when bushing button is pressed.

2. Ice and water are not dispensed.

Bad Contact Operate switch button three or

four times and verify that the lamp is on and off. See if lamp is burnt out. If lamp is O.K, then remove switch and measure the resistance between terminals. (Door Switch: 1-2, 3-4.)

Operate switch button three and four times and confirm the lamp, ice and water dispenser work. It they do not work, then remove switch and measure the resistance between terminals. (COM-NO)

Replace switch if the resistance between terminals is not zero.

Replace switch if the resistance between terminals is zero.

4 3

2 1

Page 14

5. Motor

1. Freezer/Cooling Motor Used mainly for Freezer/Cooling motor

■ Detail of connector

2) Gear Box Application Type

Gear box is used for moving and crushing ice which is stored in the ice bin. Gear box is connected at the output axis of shaded motor. Gear box changes high RPM of motor to low RPM but high power by gear box. This power can move and crush ice.

6. Solenoid.

1. Structure of Solenoid

Two types of solenoids are used for refrigerator depending on the applications such as solenoids for ice cube and ice dispenser. The solenoid is composed of an armature, stator and a main body which supports stator and pulls the armature when electricity is applied.

2. Operation Principles

When electricity is applied to the coil, magnetic field forms around the coil. The armature in the magnetic field moves toward the stator and ice dispenses. When electricity is removed, the armature moves back to its original position (rated stroke distance) by the spring force and stops moving.

CAUTIONS : • Do not operate solenoid for more than two

minutes. It may be overheat.

• Solenoid is not for continuous use but discontinuous use as it operates when customer dispenses ice.

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

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Shaft

Stator

Connector

Front(SHAFT Projective direction)

15Vdc(+)

EMF

GND(-)

Stator

Bobbin

Shaft

Gear Box

Stator

Coil

Stator

ArmatureArmature

Page 15

3. Troubleshooting

7. Heater

1. Summary

Heaters are used to remove dew and frost on the evaporator and ice and dew on the parts of refrigerator.

* SXS Refrigerator Defrost System

It is MICOM controlled automatic defrost system. Heater turns on when the set time in MICOM has elapsed and off when the defrost sensor senses the defrost is complete.

2. Types of heater and their roles

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

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Symptom Faults(parts) Check Measures

Crushed ice comes out when 1. Connector is missed. 1. Check connection parts. 1. Join connector. ice cube is selected. 2. Solenoid for ice cube is cut. 2. Check resistance between 2. Replace parts.

terminals. The resistance is infinite when it is cut.

Ice does not dispense but 1. Connector is disconnected. 1. Check connecting part. 1. Join connector. jams on the door path 2. Solenoid for dispenser is 2. Check the resistance 2. Replace parts. when ice is selected. cut. between terminals.

Resistance is infinite when it is cut.

Classification Application Functions Resistance Remarks

Heater, Sheath-AL Evaporator Upper Part Evaporator Defrost 240W Heater, Sheath-ML Evaporator Lower Part Evaporator Defrost 260W

It melts and discharges the ice dropped

Heater, Plate Drain Lower Part from the evaporator through drain pipe 45W

during defrost. Heater, Plate Chilled Room Duct Prevent icing from the chilled room duct. 5W Heater, Plate Damper Prevent icing from damper 3W Heater, Plate Dispenser(Freezer door) Remove dew from dispenser 5W Heater, Sheet Dispenser(Freezer door) Remove dew from duct door. 1W Heater, Cord Frame LCD Prevent icing from Home Bar. 2.7W Heater, Plate Tube Inject Prevent icing Tube Inject 3.5W

Page 16

3. Faults Symptom (Products): faulty heater

1) Heater, Sheath-ML/AL

2) Heater Plate (Drain)

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 16 -

Problem Symptom Checks Measures

1. The resistance is infinity when it is measured at both connector ends with a tester.

2. Visually check for a faulty defrost with eyes.

3. The resistance fluctuates very much when the resistance is measured at both ends with a tester.

4. When the resistance between both connector ends is measured with a tester, the resistance is zero or beyond the allowance of marked value. (allowance: marked value±7%)

Poor Defrost

Short circuit

1. Heater, Sheath heating wire is cut, corroded, or connecting wire is cut.

2. Evaporator is not close enough to Heater, Sheath-AL.

3. Poor terminal contact.

4. Moisture intrudes into the pipe through the crack as Heater, Sheath-AL Pipe, and/or Silicon Cap are dented.

1. Replace parts. (Reconnect if wire is disconnected.)

2. Move evaporator closer to Heater, Sheath-AL.

3. Correctly insert connector.

4. Replace parts.

1. The resistance is infinity when the resistance is measured at both connector ends with a tester.

2. The resistance fluctuates very much when the resistance is measured at both connector ends with a tester.

3. When the resistance between both connector ends is measured with a tester, the resistance is zero or beyond the allowance of marked value. (allowance: marked value±7%)

Poor defrost

Short circuit

1. Heating wire is cut or corroded.

2. Poor terminal contact.

3. Moisture intrudes as the heating wire is damaged by a sharp fin of evaporator.

1. Replace parts. (Reconnect if wire is cut)

2. Correctly reinsert the connector.

3. Replace parts.

Page 17

3) Other Heaters

8. Valve

1. Nomenclature of each part

 Solenoid Coil  Spring  Plunger  Packing  Holder  Flow Control  Flow Washer

2. Operation Principles

1) While Opening When power is on and the inlet water pressure reaches at a certain value, the plunger (3) moves up by solenoid coil. The water passes through porous hole and then center holes of the holder and flows to the outlet. Flow control (6) and flow washer (7) are included in order to maintain a constant flow rate and pressure (1.0 ~

8.0 kgf/cm

) in A line (water supplied to icemaker).

2) While Closing The water stops flowing to outlet as packing seals (4) the hole of holder (5) by spring when power is off.

FUNCTIONS AND OPERATION PRINCIPLES OF MAIN PARTS

- 17 -

Corresponding

Problem

Heater

Symptom Checks Measures

1. Heating wire is Heater Plate The temperature of chilled 1. The resistance is infinite when the 1. Replace parts. cut or corroded. (Chilled drawer drawer is high. resistance is measured at both (Reconnect if the wire

2. Poor terminal duct) (icing on duct) connector ends with a tester. is cut) contact. 2. The resistance significantly very much 2. Correctly insert

when the resistance is measured at both connector. connector ends with a tester.

Heater Plate Incorrect refrigerator (damper) compartment temperature.

(icing on the duct)

Heater Plate Dew forms around the 1. Remove connector from freezer hinge (dispenser) dispenser and measure the resistance of heater.

Sheath Heater Dew forms around duct door. 1. The resistance is infinite when it is (duct door) measured at both connector

ends with a tester.

Cord Heater Dew forms around 1. Remove connector from R hinge and (Frame LCD) Frame LCD. measure the resistance of heater.

Outlet

Inlet

Page 18

1. Working Principles

1-1. Icemaker Working Principles

1-2. Dispenser Working Principles

1. This function is available in Model GR-D267 where water and ice are available without opening freezer compartment door.

2. Crushed Ice is automatically selected when power is initially applied or reapplied after power cut.

3. When dispenser selection switch is continuously pressed, light is on in the following sequence: Water → Cube Ice → Crushed Ice.

4. Lamp is on when dispenser bushing button is pressed and vice versa.

5. When dispenser crushed ice bushing button is pressed, dispenser solenoid and geared motor work so that crushed ice can be dispensed if there is ice in the ice bin.

6. When dispenser cube ice bushing button is pressed, dispenser solenoid, cube ice solenoid and geared motor work so that cubed ice can be dispensed if there is ice in the ice bin.

7. When dispenser water bushing button is pressed, water valve opens and water is supplied if water valve is properly installed on the right side of the machine room.

8. Ice and water are not available when freezer door is open.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 18 -

• Level Icemaker Cube Mould for Initial Control after power is applied.

Power Input

Initial Control

Ice Making Control

Ice Ejection Control

Water Supply Control

Test Control

• Wait until the water in the cube mould is frozen after Icemaker starts operation.

• Detect if ice bin is full of ice by rotating ice ejection motor in normal and reverse direction and eject ice into the ice bin if ice bin is not full.

•

This is for refrigerator assembly line and service. When ice making test switch is pressed,

it operates in the following steps: initial ice ejection water supply control steps.

• Conduct Ice Making Control after supplying water into the Icemaker cube mould by operating water valve.

Page 19

2. Function of Icemaker

2-1. Initial Control Function

1. When power is initially applied or reapplied after power loss, the Icemaker cube mould level is detected after completion of MICOM initialization. The detecting lever moves up and down.

2. The level of Icemaker cube mould is determined by output signal, high and low signal, of Hall IC. The cube mould is leveled by rotating ice ejection motor in normal or reverse direction. The High/Low Hall signal is be applied to MICOM Pin No. 42.

3. If there is no change in signals one minute after the geared motor starts to operate, it stops Icemaker operation and checks the signal every hour. It reinitializes the Icemaker when the feedback signals becomes normal.

4. It datermines that the initialization is completed when it senses the Icemaker cube mould is horizontal.

5. Ice ejection conducts for 1 cycle whether ice or not ice is in the ice bin when power is initially applied.

2-2. Water Supply Control Function

1. This function supplies water into the Icemaker cube mould by operating the water valve when ice ejection control is completed and Icemaker mould is level.

2. The quantity of water supplied is determined by DIP switches and water pressure.

3. The refrigerator actively detects the DIP switch seting so that interrupting power is not necessary to change the supply preset. If the DIP switches are changed while water is being supplied, the changes will take effect until the supply cycle is complets.

4. When water supply signal is applied to water and ice valves at the same time during water supply, water is supplied to water valve. If water supply signal is applied to ice valve during water supply, water is supplied to both water and ice valves.

2-3. Ice Making Control Function

1. Ice making control is carried out from the completion of water supply to the completion of ice making in the cube mould. Ice making sensor detects the temperature of cube mould and completes ice making. (ice making sensor is fixed below Icemaker cube mould)

2. Ice making control starts after completion of water supply control or initial control.

3. Ice making is determined to be completed when ice making sensor temperature reaches at -8°C[18°F] 100 minutes after water is supplied to Icemaker cube mould.

4. It is judged that ice making is completed when Icemaker sensor temperature reaches below -12°C[10°F] after 20 minutes in condition 3.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 19 -

DIP SWITCH SETTING

SWITCH 1 SWITCH 2 SWITCH 3

WATER SUPPLY TIME REMARKS

1 OFF OFF OFF 6.5 Sec. 2 ON OFF OFF 5.5 Sec. 3 OFF ON OFF 6 Sec. 4 ON ON OFF 7 Sec. 5 OFF OFF ON 7.5 Sec. 6 ON OFF ON 8 Sec. 7 OFF ON ON 9 Sec. 8 ON ON ON 10 Sec.

* The quantity of water supplied

depends on DIP switch setting conditions and water pressure as it is a direct tap water connection type. (the water supplied is generally 80 cc to 120 cc)

* DIP switches are on the main PWB.

Page 20

2-4. Ice Ejection Control Function

1. This function ejects the ice from the Icemaker cube mould after ice making is completed.

2. If Hall IC signal is on within 3.6 seconds after ice ejection motor rotates in normal direction, it does not proceed with ice ejection. but waits. If the ice bin is full, ice ejection motor rotates in normal direction in every hour to check the condition of ice bin. If the ice bin is not full, the water supply control starts after completion of ice ejection control. If the ice bin is full, ice ejection motor rotates in reverse direction and stops ice making.

3. If ice bin is not full, ice ejection starts. The cube mould tilts to the maximum and ice is separated from the mould as ice checking lever raises.

4. Ice ejection motor stops for 1 second if Hall IC signal changes from OFF (low) to ON (high) after 3.6 seconds when ice ejection motor has rotated in normal direction. If there is no change in Hall IC signals within 1 minute after ice ejection motor operates, ice ejection motor stops as ice ejection motor or Hall IC is out of order.

5. If ice ejection motor or Hall IC is abnormal, ice ejection motor rotates in normal direction to perform its reinitialization. It resets the Icemaker if the ice ejection motor or Hall IC is normal.

6. The mould stops for 1 second at maximum tilted conditions.

7. The mould returns to a leveled position as ice ejection motor rotates in reverse direction.

8. When the mould is level, the cycle starts to repeat: Water Supply → Ice Making → Ice Ejection → Mould Returns to Horizontal

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 20 -

Bank is

not full

HALL IC

OUTPUT

SIGNALS

Bank is

full

HALL IC

OUTPUT

SIGNALS

ICE CHECKING

AXIS

ICE CHECKING LEVEL 30°

Maximum tilting

point

Ice making

(Original point)

Lock

2±1 sec

9±3 sec 8±3 sec

Ice Checking Ice Ejection

Lock

Horizontal

Conditions

Level Retrun

Conditions

Page 21

2-5 Test Function

1. This function forces operation during operation servicing and cleaning. The test switch is mounted under the automatic Icemaker. The test function starts when the test switch is pressed for more than 0.5 second.

2. Test button does not work during ice ejection and water supply. It works when the tray is in the horizontal conditions. If the mould is full of ice during test function operation, ice ejection control and water supply control will not work.

3. When the test switch is pressed for more than 0.5 second in the horizontal condition, ice ejection starts irrespect of the mould conditions. Water will splash if test switch is pressed before the water in the mould freezes. Water shall be supplied while the mould returns to the horizontal conditions after ice ejection. Problems involving ice ejection, returning to the horizontal conditions, and water supply can be checked via the test switch. When test function performs normally, a buzzer sounds and the water supply function begins. Check it for repair if buzzer does not sound.

4. When water supply function is completed, the cycle continues as follows: Ice making → Ice ejection → Returning to horizontal conditions → Water supply

5. Remove ice from the Icemaker cube mould and press test switch. When Icemaker cube mould is full of ice as ice ejection and water supply controls do not operate.

2-6. Other functions relating to freezer compartment door opening

1. When freezer door is open, ice dispenser stops in order to reduce noise and ice drop.

2. When freezer door is open during ice ejection and cube mould returning to horizontal condition, ice ejection and cube mould level return proceed.

3. When freezer door is open, geared motor and cube ice solenoid immediately stop and duct door solenoid stops after 5 seconds.

4. Water dispenser stops in order to prevent water spilling when freezer door is open.

5. Test function operates normally regardless of refrigearator compartment door opening.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 21 -

Page 22

3. Icemaker Troubleshooting

* Troubleshooting: it is possible to check the dispenser by pressing freezer and refrigerator temperature control buttons

for more than 1 second. (Icemaker is normal if all leds are on): refer to trouble diagnposis function in MICOM section.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 22 -

Yes

Is DC Power (5V and 12V)

output normal?

Failed DC Power

• Check DC power (5V, 12V).

Change main PWB

Is cube ice LCD off during

troubleshooting check?

Failed icemaking sensor

• Check the resistance of both ends (1,2) of icemaking sensor of CON9.

• Defects between icemaking sensor and board (Pin No. 60 of IC1)

Replace Ice making Sensor

Is Crushed Ice LCD off during

troubleshooting check?

Failed Icemaker Unit

• Is the resistance of both ends (9,10) of ice ejection motor of CON9 between 18 and 22Ω?

• Is ice ejection motor drive circuit (IC11 and peripheral circuits) normal?

• Defects between Hall IC and Board (Pin No. 42 of IC1).

• Confirm ice ejection and level return when pressing test switch.

Replace Icemaker Unit

Replace Main PWB

Are ice

ejection and level return

normal when test switch is

pressed for more than 0.5 second?

Does the bell

sound once?

Failed Icemaker unit test switch

• Are both ends (5,6) of CON9 test switch open?

• Defects between test switch and board (Pin No. 38 of IC1).

• Are both ends (3,4) of CON9 ice maker stop switch short?

Replace Icemaker Unit

Replace water supply valve

• Is power applied to water supply valve?

• Does the water supply valve work normally?

• Is the water supply line normally connected?

Poor water supply

Is water suppy normal

after Ice ejection and level return

by ice ejection motor?

Normal

Page 23

4. Icemaker circuit part

The Icemaker circuit above applies to the GR-D267 and consists of the Icemaker unit part installed in the freezing section and the Icemaker drive part of the main PWB.

Water supply to the Icemaker container is accomplished by opening the valve via a solenoid relay for a duration set by the DIP switches. When water supply time elapsed, water supply automatically stops. This circuit exists for implementing functions such as ice removal, ice-full detection, horizontal balancing and sense of ice-making temperature sensing for the Icemaker container. Ice-making temperature sensing is same as in the temperature sense circuit part of the main PWB, refer to it.

Test switch input detection of the Icemaker is same as in the door switch input detection circuit of the main PWB.

1. This function is used in operation test, service execution and cleaning, etc. And is performed if pressing the test switch installed at the automatic Icemaker itself for more than 0.5 seconds.

2. The test switch operates when the ice-maker is in the horizontal position. Test function is not available during the water supply operation. Ice removal control and water supply controls are not performed if ice-full is detected during the operation of test function.

3. If pressing the test switch for 0.5 second or more in the horizontal status, ice removal operation is immediately performed regardless of the generation conditions of ice in the ice-making tray. Therefore, exercise caution as water may overflow when operating test function before the water has frozen. The water supply function operates with the horizontal balancing operation after ice removal operation. Therefore, you can check any problem of ice removal operation, horizontal operation and water supply. In this case, if test check returns normal feedback, a bell sound rings and water supply control is performed. No ringing of the bell sound means failure and repair service must be performed.

4. When water supply is completed, operation continues in the normal cycle of ice making, ice removal, returning to

horizontal status, and water supply.

ICEMAKER AND DISPENSER OPERA TION PRINCIPLE AND REPAIR METHOD

- 23 -

Page 24

1. Monitor Panel

2. Description of Function

2-1. Funnction of Temperature Selection

* The temperature can vary ±3 °C depending on the load condition.

❉ Whenever pressing button, setting cycles in the order of (Medium) ➝ (Medium Max) ➝ (Max) ➝ (Min) ➝

(Medium Min).

• The actual inner temperature varies depending on the food status, as the indicated setting temperature is a target

temperature, not the actual temperature within refrigerator.

• Refrigeration appears to be weak at first use. Please adjust temperature as shown after using refrigerator for minimum

of 2 to 3 days.

MICOM FUNCTION

- 24 -

OFF

WATER

TEMP TEMP

FILTER STATUS

FILTER RESET

PUSH 3 SEC.

ROOM TEMP

UNLOCK

LOCK

6 5 4 3 2 1

CUBED

CRUSHED

Division Power Initially On 1st Press 2st Press 3th Press 4th Press

Setting temperature

Temperature Control

Medium Medium Max Max Min Medium Min

Freezer Control

-19 °C [-2 °F] -22 °C [-7 °F] -23 °C [-9 °F] -15 °C [5 °F] -17 °C [1 °F]

Refrigeration

3 °C [37 °F] 2 °C [35 °F] 0°C [32 °F] 6 °C [43 °F] 4 °C [39 °F]

Control

Page 25

2-2. LCD Back Light Control

1. In order to easily view display status on the LCD, LCD Back Light turns on for a minute in application of initial power, for a minute with button use, and for a minute after closing the door.

2. If pressing any display button once with the backlight turned off, buzzer rings and button function is not performed but only backlight is turned on (If pressing the first button with the back light turned off, only back light ON function is performed).

3. When pressing the special freezing button and the freezing temperature adjustment button for more than a second, the back light is turns on and all the graphics of LCD are turned on. If releasing the button, the LCD graphic returns to in the previous state and the back light turns off (check LCD graphic and back light ON/OFF status).

2-3. Outside temperature display function

1. The temperature sensor at the left U of refrigerator senses ambient temperature and displays that temperature in the left side of Outside temperature text on the LCD display.

2. Ambient temperature is displayed up to -9°C[16°F] ~ 49°C[120°F] and displayed as Lo for less than -10°C[14°F] and as HI for more than 50°C[122°F]. If the ambient temperature sensor fails, Er is displayed.

3. Since display temperature of ambient temperature is temperature sensed by the ambient sensor in the hinge U of the freezing compartment, it may differ from the ambient temperature display of other household electrical appliances.

2-4. Lock function (display button lock)

1. When power is first applied, only the Release text is turned on in the lock/release status indicator at the right side of the LCD display.

2. If desiring to lock the display status, press the lock/release button once, Release text is turns off at the right side of lock graphic of LCD and Lock text is turned on indicating locked status.

3. The only buzzer sound rings and function is not performed even if pressing display button other than lock/release key when in the lock status.

4. If desiring to release the lock status, press the lock/release button once, Lock text turns off at the right side of lock graphic of LCD and Release text turns on in dicating locked release status.

2-5. Filter status display function

1. Remaining filter replacement period is displayed as in the below figure. Each line in dicates the number of months before the next filter replacement.

2. The graphic/text indicator appears if in the LCD if 6 months of filter use have passed.

3. Reset the filter status by pressing the filter replace button for more than 3 seconds to after replacing filters when 6 months of filter use have transpired or merely if desiring to reset the filter display status.

2-6. Automatic Icemaker

• The automatic Icemaker can automatically make 8 pieces of ice at a time up to 10 times a day, These quentities may vary

according to various conditions in cluding how many times the refrigerator door opens and closes.

• Ice making stops when the ice storage bin is full.

• If you don’t want to use automatic Icemaker, switch the Icemaker OFF.

If you want to use automatic Icemaker later, switch it ON.

NOTE : It is normal that a noise is produced when ice made is dropped into the ice storage bin.

MICOM FUNCTION

- 25 -

Classification

In initial 1 Month 2 Months 3 Months 4 Months 5 Months 6 Months

use use use use use use use

Filter Status

Display

FILTER RESET

PUSH 3 SEC.

FILTER STATUS FILTER STATUS FILTER STATUS FILTER STATUS FILTER STATUS FILTER STATUS FILTER STATUS

6 5 4 3 2 1

FILTER RESET

PUSH 3 SEC.

6 5 4 3 2 1

Page 26

2-7. When Icemaker does not operate smoothly

Ice is frozen together

• When ice is frozen together, take the lumps out of the ice storage bin, break them into small pieces, and then place them

into the ice storage bin again.

• When the Icemaker produces ice too small or frozen ice, the amount of water supplied to the Icemaker needs to adjusted.

Contact the service center.

✻ If ice is not used frequently, it may freeze together.

Power failure

• Ice may drop into the freezer compartment. Take the ice storage bin out and discard all the ice. Then dry it and place it

back in its position. After the machine is powered again, crushed ice will be automatically selected.

The unit is newly installed

• It takes about 12 hours for a newly installed refrigerator to make ice in the freezer compartment.

2-8. Super freezer

Please select this function for prompt freezing.

• On or Off cycles whenever pressing SUPER FRZ button.

• The graphic indicator remains in the On status after flickering 4 times when selecting Special Refrigeration On.

• Super freezer function automatically turns off after a fixed time passes.

2-9. Lock

This button prevents use of a different button.

• At initial Power on, the control panel is unlocked.

• Lock or Release cycles whenever pressing the LOCK CONTROL.

• Pressing another button while the panel is locked will yield no results.

2-10. Super freezing

1. Super freezing is a function to improve cooling speed of the freezing chamber by consecutively operating compressors and freezing room fan. Pressing the super freezing button toggles the Super Freezer feature on and off when the feature turns on the graphic remains on after blinking once.

2. Super freezing is cycles in order of Selection/ Release (Turn On / Turn Off) whenever pressing the selection button.

3. Super freezing is released if power failure occurs and the re frigerator then returns to the original status.

4. Temperature setting is not changed even if selecting the super freezing option is selected.

5. A change of the temperature setting of the freezing chamber or the cold storage chamber is permitted with super freezing selected. The change is processed while Super Freeze is active.

6. The cold storage chamber operates in the state currently set with super freezing selected and processed.

7. Note that the super freezing, the super freezing function deactivates after continuously operating compressor and the freezing room fan for a certain amount of time.

8. If frost removal starting time occurs during super freezing, super freezing operation executes only for the remaining time after completion of frost removal when the super freezing operation time passes 90 minutes. If passing 90 minutes, super freezing operation is carried out only for 2 hours after completion of frost removal.

9. If pressing the super freezing button during frost removal, the super freezing LCD indicator turns on but if pressing the super freezing, compressor operates only after the remaining defrost time has passed.

10. If selecting super freezing within 7 minutes (delay for 7 minutes of compressor) after the compressor stops, compressor

operates after the remaining time has passed.

11. The freezing room fan motor operates at high RPM during operation of super freezing.

MICOM FUNCTION

- 26 -

Page 27

2-11. Control of variable speed freezing room fan

1. To increase cooling speed and load response speed, the MICOM sets freezing room fan motor at the high speed of RPM or the standard RPM.

2. Only at the application of initial power, or special freezing operation, or load response operation does the MICOM direct speed of RPM. The MICOM directs the standard RPM in other general operations.

3. If opening doors of freezing / cold storage chamber or home bar while fan motor in the freezing chamber operates, the freezing chamber fan motor operates normally. (If operating in the high speed of RPM, it switches to the standard RPM). However, if opening doors of freezing chamber or home bar, the freezing room fan motor stops.

4. As for monitoring of BLDC fan motor error in the freezing chamber, MICOM immediately stops the fan motor when sensing that the BLDC fan motor is locked or pooly operating if there would be position signal for more than 65 seconds at the BLDC motor. In such cases, the MICOM in dicutes a failure (refer to failure diagnosis function table) on the LCD display and attempts arestant of the cycle in 30 minutes. If normal operation is detected, failure status is released and refrigerator resets to the initial status (reset).

2-12. Control of cooling chamber fan motor

1. The cooling chamber fan motor performs ON/OFF control by linking with the COMP.

2. It operates at the single RPM without varying RPM.

3. Failure sensing method is same as freezing fan motor (refer to failure diagnosis function table for failure display).

2-13. Door opening alarm

1. Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with doors of freezing / cold storage chamber or home bar opened.

2. Buzzer rings three times in the interval of 0.5 seconds after the first one-minute has passed after doors are opened and then repeats three times of On/Off alarm in the cycle of every 30 seconds.

3. If the doors of freezing/cold storage chamber or home bar are closed during door open alarm, alarm is immediately deactivated.

2-14. Ringing of button selection buzzer

1. If pressing the front display button, a bell sound rings.

2-15. Ringing of forced operation, forced frost removal buzzer

1. If you press the test button on the Main PCB, a tone sounds.

2. In selecting forced operation, alarm Sound is repeated and completed in the cycle of On for 0.2 second and Off for 1.8 second three times.

3. In selecting forced frost removal, alarm sound is repeated and completed in the cycle of On for 0.2 second , Off for 0.2 second, On for 0.2 second and Off for 1.4 second three times.

MICOM FUNCTION

- 27 -

Doors of

freezing/cold

storage

chamber or

home bar

BUZZER

Closing

Opening

Within

a minute

A minute

seconds30seconds30seconds

Opening

Closing Closing

3 Times 3 Times 3 Times 3 Times

Page 28

2-16. Frost removal function

1. Frost removal is performed every 7 to 7.5 hours of accumulated compressor operation time.

2. After providing initial power (or after power failure), frost removal starts whenever total operation time of compressor becomes 4 to 4.5 hours.

3. Frost removal is completed if temperature of the frost removal sensor becomes more than 5°C[41°F] after starting frost removal. Poor frost removal is not displaced if it does not arrive at 5°C[41°F] even if two hours have passed after starting frost removal.

4. No removal is done if frost removal sensor fails (snapping or short-circuit).

2-17. Electric Equipment Progressive Operation

Compressor, defrost heater, freezer fan, cooling fan, electromagnetic single motor damper, etc. start in the following sequence in order to prevent noise and parts damage when power is first applied and when testing is complete.

MICOM FUNCTION

- 28 -

Function Load Starting Sequence Remarks

When electricity is first applied TEST MODE

When the temperature of defrost sensor is above 45°C[1 13°F] (when purchased

or moved to another house)

If there is an error in the process, startup does not work.

■Load starting sequence when

freezer and refrigerator doors are closed.

If switch is once more pressed or the temperature of defrost sensor is above +5°C[41°F] in test mode 2, it returns to test mode and starts initial drive. (compressor will start after seven minutes)

When the temperature of defrost sensor is below 45°C[1 13°F] (during power loss

and servicing)

Test Mode 1 (Forced Starting)

Test Mode 2 (Forced Defrost)

POWER

COMP

FAN

(High Speed)

MOTOR

DAMPER

HOME

BAR

HEATER

POWER

DEFROST

HEATER

HOME

BAR

HEATER

OFF

HOME

BAR

HEATER

VEGETABLE

HEATER

DAMPER

HEATER

COMP

FAN

MOTOR

DAMPER

VEGETABLE

HEATER

DAMPER

HEATER

OFF

TEST

S/W

(Press

Once)

COMP

FAN

(High Speed)

MOTOR

DAMPER

TEST

S/W (Press Twice)

COMP

OFF

FAN OFF

MOTOR

DAMPER

1/2 sec

1/4 sec

1/4

sec

1/4 sec

1/2 sec

sec

1/4

sec

DEFROST

HEATER

OFF

sec

1/4 sec

sec

1/4 sec

1/4

sec

1/4 sec

1/4

sec

1/4 sec

1/4

sec

OTHER

LOAD

OFF

DEFROST

HEATER

Page 29

2-18. Failure Diagnosis Function

1. Failure diagnosis function is a function to facilitate servicing when improper operation of the product occurs.

2. The user will notice a failure when pressing one of the function buttons yields no consequent effect beyond the audible Ding.

3. If the improper operation ceases while a failure is displayed, the MICOM resets the display to a normal state.

4. A failure code is indicated on the LCD displays refrigerator and freezer temperature readouts temperature for the freezing room and the display part of setting temperature for the cold storage room of LCD, which are placed at the display part of a refrigerator. All the LCD graphics other than a failure code are turned off.

✽ In display of the failure mode, all LCDs of setting temperature for freezing/ setting temperature and for cold storage are

turned off (excluding Note1 and Note2).

MICOM FUNCTION

- 29 -

OFF

WATER

FILTER STATUS

UNLOCK

6 5 4 3 2 1

CUBED

CRUSHED

TEMP TEMP

ROOM TEMP

●● : Normal Operation

Er FS

Er rS

Setting temperature

display (Note 2)

Er dS

Er dH

Er FF

Er CF

Er CO

Er dP

Setting temperature

display (Note 1)

Setting temperature

display (Note 2)

Setting temperature

display (Note 2)

Failure code display part

Setting

temperature

for freezing

Setting

temperature for

cold storage

No. Item

Symptoms of failure

Freezer

Fan

Compressor

Stepping

motor damper

Defrost

Heater

M/C room

Fan

Product operation status in failure

Failure of freezer sensor

Failure of refrigerator sensor 1

Failure of refrigerator sensor 2

Failure of frost removal sensor

Poor of frost removal

Failure of BLDC FAN at freezing section

Failure of BLDC FAN at machine section

Failure of Communication

Abnormal electronic single motor Damper

Failure of Outside Sensor

Failure of ice removal sensor

Failure of Icemaker unit

Snapping or short-circuit of freezer sensor

Snapping or short-circuit of refrigerator sensor 1

Snapping or short-circuit of refrigerator sensor 2

Snapping or short-circuit of frost removal sensor

Snapping of frost removal heater or temperature fuse, pull-out of connector (indicated minimum 4 hours after failure occurs)

Poor motor, connection of wires to fan. Contact of structures to Fan. Snapping or short-circuit of L/wire (if there is no fan motor signal for more than 60 seconds in operation of fan motor

Connection between main PCB and display PCB. Snapping or short-circuit of L/wire. Transmission between main PCB and display PCB. Poor TR and receiving part.

Faulty damper motor. Lead wire of damper lead switch in out or shortcircuited. Interference of foreign materials in damper baffle or EPS.

Snapping or short-circuit of outside temperature perceiving sensor

Snapping or short-circuit of icemaking sensor

Poor motor or Hall IC within ice-maker unit. Snapping or short-circuit of L/Wire. Poor main PCB drive circuit.

Standard

RPM

Standard

RPM

Standard

RPM

Standard

RPM

Standard

RPM

OFF (check every

30 minutes)

Standard

RPM

Standard

RPM

●●

OFF (check

every 30 minutes)

●●

ON for 15minutes

OFF for 15minutes

●●

No frost removal

●●

Open for 10munutes, closing for 15 minutes

●●

Check

operation

every hour

●●

Page 30

Note1) In failure of outside sensor, the temperature setting for freezing/ cold storage displays normally and indicated Er is

indicated on the outside temperature display part (normally displayed except for the outside temperature display part).

Note2) Improper operation of R2 sensor, Icemaker-sensor and Icemaker kit are displayed in LCD check, but not indicated

on the failure display part. To check these items, press freezing temperature adjustment button and special freezing button for a second or more.

Cold storage sensor 2 Normal : (C) Part LCD graphic- ON (middle partition) Abnormal: Only (C) Part LCD graphic-OFF

Icemaker sensor

Normal: (D) Part LCD graphic-ON Abnormal: Only (D) Part LCD graphic-ON

Icemaker Unit

Normal: (E) Part LCD graphic-ON Abnormal : Only (E) Part LCD graphic-ON

2-19. Test Function

1. The purpose of the test function is to check function of the PWB and product and to search for the failed part when the product is in a failure status.

2. Test button is located on the main PCB of refrigerator (test switch), and the test mode will finish after a maximum of 2 hours irrespective of test mode and then is before restting to the normal operation.

3. Function adjustment buttons do not function during test mode but only warning sound rings.

4. Upon test mode completion, always pull the power cord out and then plug-in it again to reset to normal operation.

5. If misoperations contents such as sensor failure are found during performance of test mode, release the test mode and note the failure code.

6. If pressing the test button is pressed during a failure code display, test mode will not be activated.

MICOM FUNCTION

- 30 -

Other LCD graphics - ON

Test 1

Test 2

Normal

condition

Mode Manipulation Content Remarks

Press TEST switch once

Press TEST switch once at TEST1 condition

Press TEST switch once at TEST2 condition

1. Continuous operation of compressor

2. Continuous operation of freezing chamber fan (high speed RPM) and M/C chamber fan

3. Frost removal heater OFF

4. Full opening status (baffle opened) status of electronic step motor damper

5. All display LCD graphics - ON.

1. Compressor OFF

2. Freezing chamber fan and M/C chamber fans are turned off.

3. Frost removal heater ON

4. Full closing status (baffle closed) status of electronic step motor damper

5. All display LCD graphics - OFF ( (A) Medium status. (B) Medium status. Only LCD is turned on)

Return to the initial status.

Freezing room fan is turned off in door open.

Compressor is operates after 7 minutes.

Page 31

✻ LCD check function: If simultaneously pressing special freezing button and cold temperature adjustment button for a

second, a back light is turns on and all display LCD graphics turn on. On releasing the button, the LCD graphic displays the previous status, and the back light is turns off (LCD graphic and back light ON/OFF check).

2-20. Function of built-in ice dispenser and water dispenser built-in

1. This function allows dispensing of ice and water to come outside without opening door.

2. If pressing the dispenser switch (bushing button) after selecting ice (cubed or crushed) or water, ice or water equivalent to each come out accordingly. However, the duct doors are opened by an electrical solenoid valve (Duct Door Solenoid) if when pressing the dispenser switch for ICE selection. After pressing the dispenser press switch and releasing it, the duct door closes after it is opened for 5 seconds.

3. Dispensing ice and water stops if freezing chamber door is opened.

4. If there is no Off signal even when 3 minutes have passed while pressing the dispenser press switch after selecting ice (cubed or crushed) or water, geared motor and solenoid (Cube, Water) is automatically turned off. However, the solenoid (duct door) stops 5 seconds after Off (to prevent short-circuiting of a coil due to overheating of solenoid).

5. Dispenser Lamp On/Off function Lamp on the dispenser part is turned on when pressing the dispenser press switch after selecting ice (cubed or crushed) or water. The lamp turns off after releasing the dispenser switch.

6. Selection function of crushed ice / water / cubed ice

1) This is function allows selection of crushed ice water, cubed ice function depending on user’s selection. Display and

selection is changed by pressing the dispenser selection button.

2) At initial Power On, crushed ice is automatically selected.

3) In selecting crushed ice, geared motor operates so that crushed ice can be supplied outside by pressing the dispenser

switch when ice is formed in the ice storage container (Ice Bin).

4) In selecting crushed ice, geared motor is operates so that cube ice can be supplied outside if pressing the dispenser

switch when ice is present in the ice storage container (Ice Bin).

7. Water dispenser function

1) LCD is displays water selection if user chooses water via the selection control.

2) Water dispenser function is a type directly connected to a water pipe. The water solenoid valve built-in at the right side

of the Cooling chamber opens to supply water when the dispenser switch is pressed.

MICOM FUNCTION

- 31 -

OFF

WATER

TEMP TEMP

FILTER STATUS

FILTER RESET

PUSH 3 SEC.

ROOM TEMP

UNLOCK

LOCK

6 5 4 3 2 1

CUBED

CRUSHED

Page 32

1. Explanation of PWB circuit

1-1. Power circuit

Power circuit consists of SMPS (SWITCHING MODE POWER SUPPLY) power. The SMPS consist of the rectifying part (BD1, CE1) converting AC voltage to DC voltage, the switching part (IC2) switching the converted DC voltage, transformer transferring energy of the primary side of the switching terminal to the secondary side and the feedback part (IC3, IC4) transferring control information to the primary side.

Caution : Since high voltage (DC310V) is maintained at the power terminal, please take a measurements after more than 3

minutes have passed after removing power cords in the abnormal operating conditions.

Voltages of specific test locations are shown:

EXPLANATION FOR MICOM CIRCUIT

- 32 -

Part VA1 CE1 CE2 CE3 CE4 CE5

Voltage 230 Vac 310 Vdc 16 Vdc 12 Vdc 15.5 Vdc 5 Vdc

Page 33

1-2. Oscillation circuit

The oscillation circuit is a circuit with the purpose of generating basic time for clock occurrence for synchronization and time calculation related to information transmission/reception of internal circuitry in IC1 (MICOM). The OSC1 must always use rated parts since If SPEC is changed, time calculated at the IC1 may be changed, and internal operations may cease entirely.

1-3. Reset circuit

The reset circuit is a circuit allowing various parts such as RAM inside of MICOM (IC1) to initialize and the whole of function to start from the initial status, when initial power is input or when power is reapplied again to MICOM following a spontaneous power loss. A LOW DC level is applied to the reset terminal of MICOM in the beginning of power supply for a constant time (10ms). Reset terminal during general operation is 5V (No MICOM operation occurs in failure of RESET IC).

EXPLANATION FOR MICOM CIRCUIT

- 33 -

Page 34

1-4. Load/dispenser operation, door opening circuit

1. Load driving circuit

✽ Even if opening the door of freezing chamber or cold storage chamber during operation of fan motor at the freezing

chamber, this circuit does not stop and operates at the standard RPM. In addition, if doors of freezing chamber or cold storage chamber, the fan motor normally operates at the RPM previously operated.

✽ (A), (B), (C) and (D) of door switch for the freezing chamber or freezer room are connected to the door open sensing

circuit in parallel toward both ends of switch to signal which door is open at MICOM.

✽ Since a door switch of the home bar is connected to door switch (C), (D) of the cold storage chamber. The circuit senses

door opening if either door is opened.

✽ The fan motor will immediately stop if opening doors of the freezing chamber or cold storage chamber during TEST mode

and it immediately restarts upon closing them.

EXPLANATION FOR MICOM CIRCUIT

- 34 -

F-Door

S/W

Def-HEATER

S/W S/W

Measuring part (IC6) No.16 No.15 No.14 No.13 No.14 (IC7) No.15 (IC7) No.11 (IC7)

Status

ON Within 1 V

OFF 12 V

Type of Load Compressor

Frost

Removal

Heater

Converting

Relay

Refrigerator

LAMP

Motor

Damper

Heater

Control Box

Heater

Pipe Heater

Page 35

2. Dispenser operation circuit

1) Check load driving status

2) Lever S/W sensing circuit

EXPLANATION FOR MICOM CIRCUIT

- 35 -

Measuring part

Lever SWITCH

IC1(Micom) (No. 16)

On(Press)

OFF 5V

Measuring part IC6-13 IC6-12 IC6-11 IC6-10 IC7-12 IC7-10 IC7-16

Status

ON Within 1 V

OFF 12 V

Type of Load

GEARED

MOTOR

SOLENOID

CUBE

WATER VALVE

ICE WATER

SOLENOID

DISPENSER

HOME BAR

HEATER

SOLENOID

PILOT

5 V 0 V

(60 Hz)

Page 36

3. Door opening sensing circuit

Since door switch sensing switch (A), (B) is a separate switch even if the door switch of the freezing room normally operates, they may fail to sense door opening in the failure of switch at both ends of (A) and (B) or in failure of the L/wire. Lamp in the cold storage chamber does not turn on if the MICOM of the cold storage chamber fails to sense the door open switch (C), (D) or the home bar switch.

EXPLANATION FOR MICOM CIRCUIT

- 36 -

Closing 5 V ( A - B , C - D . SWITCH at both ends are at Off status)

Opening 5 V ( A - B , C - D . SWITCH at both ends are at On status)

Measuring part

IC1 (MICOM) No. 47, 46 Pin

Door of Freezing/Cold Storage Room

Page 37

1-5. Temperature sensing circuit

The above circuits are circuits attached to freezing chamber sensor and cold storage room sensors for adjusting temperature settings in the freezing chamber, and cold storage chamber, ice-maker sensor for sensing water temperature in ice-making, or and to an evaporator for sensing temperature of frost removal operations. Short or open status checking of every temperature sensor is as follows:

EXPLANATION FOR MICOM CIRCUIT

- 37 -

SENSOR CHECK POINT

NORMAL(-30 °C ~ 50 °C)

SHORTED OPEN

(-22 °F ~ 122 °F)

Freezing sensor POINT A Voltage

Frost removal sensor POINT B Voltage

Cold storage sensor 1 POINT C Voltage

0.5 V~4.5 V 0 V 5 V

Cold storage sensor 2 POINT D Voltage

Icemaking sensor POINT E Voltage

Room temperature sensor POINT F Voltage

Page 38

1-6. Switch entry circuit

The following circuits are entry circuits for sensing signal form test Switch, and the electronic single motor damper reed Switch for examining the refrigerator.

1-7. Option designation circuit (model separation function)

The above circuits are used for designating separation by model as option and notifying the MICOM. Designation of option by model and the application standards are as follows:

u These circuits are accurately pre-adjusted in shipment from factory and so you must not alter the option.

EXPLANATION FOR MICOM CIRCUIT

- 38 -

Separation Connection Status Application Standard

Connected Export model

OP1

CUT Domestic model

Page 39

1-8. Fan motor driving circuit (freezing chamber, M/C chamber)

1. This circuit performs function to make standby power ‘0’ by cutting off power supplied to ICs inside of the fan motor when the fan motor is OFF.

2. This circuit performs a temporary change of speed for the fan motor and applies DC voltage ranging between 7.5V an 16V to the motor.

3. This circuit futher functions to stop the fan motor further by cutting off power applied to the fan motor as it senses the fan motor’s RPM.

EXPLANATION FOR MICOM CIRCUIT

- 39 -

a , d part b part e part c , f part

Motor OFF 5V 2V or less 2V or less 0 V

Motor ON 2 ~ 3V 12 ~ 14V 8 ~ 16V 0 V

CE7

Page 40

1-9. Temperature compensation and temperature compensation circuit

1. Temperature compensation at freezing chamber, cold storage chamber

u Temperature compensation table by adjustment value (difference value against current temperature)

Ex) If changing compensation resistance at a cold storage room (RCR1) from 10 kΩ (current resistance) to 18 kΩ

(modified resistance), temperature at the cold storage will increase by +1°C [+1.8°F].

EXPLANATION FOR MICOM CIRCUIT

- 40 -

Temperature compensation at

Cold storage chamber

Temperature compensation at Freezing chamber

Freezing chamber Cold storage chamber

Resistance value Temperature Resistance value Temperature Remarks

(RCF1) compensation (RCR1) compensation

180 kΩ +5 °C [+9°F] 180 kΩ +2.5 °C [+4.5°F] Warmer

56 kΩ +4 °C [+7.2°F] 56 kΩ +2.0 °C [+3.6°F] compensation 33 kΩ +3 °C [+5.4°F] 33 kΩ +1.5 °C [+2.7°F] 18 kΩ +2 °C [+3.6°F] 18 kΩ +1.0 °C [+1.8°F] 12 kΩ +1 °C [+1.8°F] 12 kΩ +0.5 °C [+0.9°F] 10 kΩ 0 °C [0°F] 10 kΩ 0 °C [0°F]

Reference temperature

8.2 kΩ -1 °C [-1.8°F] 8.2 kΩ -0.5 °C [-0.9°F]

5.6 kΩ -2 °C [-3.6°F] 5.6 kΩ -1.0 °C [-1.8°F]

3.3 kΩ -3 °C [-5.4°F] 3.3 kΩ -1.5 °C [-2.7°F] 2 kΩ -4 °C [-7.2°F] 2 kΩ -2.0 °C [3.6°F] Cooler

470 Ω -5 °C [-9°F] 470 Ω -2.5 °C [-4.5°F] compensation

Page 41

u Temperature compensation table at the cold storage room is as follows:

u Temperature compensation at the freezing chamber is also performed in the same manner as cold storage chamber.

Temperature compensation value is twice that of the cold storage chamber.

u This circuit determines the necessary level of temperature compensation for the MICOM to control temperature of each

chamber.

EXPLANATION FOR MICOM CIRCUIT

- 41 -

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

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

470Ω [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F] [8.1 °F] [9 °F]

change

Up Up Up Up Up Up Up Up Up Up

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

2 kΩ [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F] [8.1 °F]

Down change

Up Up Up Up Up Up Up Up Up

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

3.3 kΩ [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F] [7.2 °F] Down

Down

change

Up Up Up Up Up Up Up Up

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

5.6 kΩ [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F] [6.3 °F]

Down Down Down

change

Up Up Up Up Up Up Up

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

8.2 kΩ [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F] [5.4 °F]

Down Down Down

Drop

change

Up Up Up Up Up Up

Cold storage 2.5 °C2 °C 1.5 °C1 °C 0.5 °C No 0.5 °C1 °C 1.5 °C2 °C 2.5 °C

chamber 10 kΩ [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F] [4.5 °F]

(RCR1)

Down Down Down Down Down

change

Up Up Up Up Up

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

12 kΩ [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F] [3.6 °F]

Down Down Down Down Down Down

change

Up Up Up Up

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

18 kΩ [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F] [2.7 °F]

Down Down Down Down Down Down Down

change

Up Up Up

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

33 kΩ [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F] [1.8 °F]

Down Down Down Down Down Down Down Down

change

Up Up

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

56 kΩ [8.1 °F] [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F] [0.9 °F]

Down Down Down Down Down Down Down Down Down

change

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

180 kΩ [9 °F] [8.1 °F] [7.2 °F] [6.3 °F] [5.4 °F] [4.5 °F] [3.6 °F] [2.7 °F] [1.8 °F] [0.9 °F]

Down Down Down Down Down Down Down Down Down Down

change

Modification

resistance

Current resistance

Page 42

2. Compensation circuit for weak-cold, over-cold in freezing chamber

u The above option circuit allows compensation for temperature in the cold storage chamber by simply by cutting service

jumpers.

EXPLANATION FOR MICOM CIRCUIT

- 42 -

Compensation Compensation

for weak-cold for over-cold

Temperature compensation value

Remarks

JCR3 JCR4 JCR1 JCR2

in cold storage chamber

0 °C [32 °F] (In shipment from factory)

CUT -1 °C [-1.8 °F]

CUT +1 °C [+1.8 °F]

CUT CUT -2 °C [-3.6 °F]

CUT CUT +2 °C [+3.6 °F] CUT CUT 0 °C [0 °F] CUT CUT 0 °C [0 °F]

CUT CUT 0 °C [0 °F] CUT CUT 0 °C [0 °F]

CUT CUT CUT -1 °C [-1.8 °F]

CUT CUT CUT +1 °C [+1.8 °F]

CUT CUT CUT CUT 0 °C [0 °F]

Thermal compensation by Jumper CUT

JCR1 +1 °C [+1.8 °F]

+2 °C [+3.6 °F]

JCR2 +1 °C [+1.8 °F] JCR3 -1 °C [-1.8 °F]

-2 °C [-3.6 °F]

JCR4 -1 °C [-1.8 °F]

Page 43

1-10. Communication circuit and connection L/Wire between main PCB and display PCB

The following circuit is a communication circuit used for exchanging the necessary information between main MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB.

Transmission/receipt L/Wire is necessary display PCB for driving the display PCB is required.

Poor communication occurs if a continuous information exchange fail to continue for more than 30 seconds between main MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB.

EXPLANATION FOR MICOM CIRCUIT

- 43 -

GND

12Vdc

Transmission

Reception

PCB ASSEMBL Y DISPLA Y

Main MICOM LCD dedicated MICOM

DC 12V

GND

Transmission (error status)

Reception (notch status)

Main PCB L/Wire FD/H(4-wires) Display PCB

Page 44

2. Sensor resistance characteristics table

u Resistance value tolerance of sensor is ±5%. u In measuring resistance value allowance of sensor, perform measurement after leaving the sensor for more than 3

minutes at the measuring temperature (delay is required due to sense speed relation relationship).

u Since an analog tester has a large measuring temperature, measuring with a digital tester is strongly recommended. u Resistance of the cold storage sensor 1 and 2 shall be measured with a digital tester after separating CON8 of the PWB

ASSEMBLY and the MAIN part.

u Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSEMBLY

and the MAIN part.

EXPLANATION FOR MICOM CIRCUIT

- 44 -

Measuring T emperature (°C / °F) Freezing Sensor

Cold storage sensor 1, 2.

Frost removal sensor, Outside sensor

-20 °C [-4 °F] 22.3 kΩ 77 kΩ

-15 °C [-5.0 °F] 16.9 kΩ 60 kΩ

-15 °C [-5.0 °F] 13.0 kΩ 47.3 kΩ

-5 °C [23.0 °F] 10.1 kΩ 38.4 kΩ 0 °C [32 °F] 7.8 kΩ 30 kΩ

+5 °C [41 °F] 6.2 kΩ 24.1 kΩ +10 °C [50 °F] 4.9 kΩ 19.5 kΩ +15 °C [59 °F] 3.9 kΩ 15.9 kΩ +20 °C [68 °F] 3.1 kΩ 13 kΩ +25 °C [77 °F] 2.5 kΩ 11 kΩ +30 °C [86 °F] 2.0 kΩ 8.9 kΩ

+40 °C [104 °F] 1.4 kΩ 6.2 kΩ +50 °C [122 °F] 0.8 kΩ 4.3 kΩ

Page 45

3. PWB parts diagram and list

3-1. PWB Assembly, main part diagram

EXPLANATION FOR MICOM CIRCUIT

- 45 -

Page 46

3-2. Parts list

EXPLANATION FOR MICOM CIRCUIT

- 46 -

Page 47

EXPLANATION FOR MICOM CIRCUIT

- 47 -

WATER SUPPLY S/W

Page 48

3-3. DISPLAY ASSEMBLY part diagram

EXPLANATION FOR MICOM CIRCUIT

- 48 -

Page 49

3-4. DISPLAY circuit diagram

EXPLANATION FOR MICOM CIRCUIT

- 49 -

Page 50

4. PWB circuit diagram - PWB circuit diagram may vary a little bit depending on actual condition.

EXPLANATION FOR MICOM CIRCUIT

- 50 -

PWB ASSEMBL Y , MAIN

Page 51

EXPLANATION FOR MICOM CIRCUIT

- 51 -

PCB ASSEMBLY, DISPLAY

Page 52

THE CIRCUIT DRAWINGS

CIRCUIT

- 52 -

Page 53

1. Trouble Shooting

PROBLEM DIAGNOSIS

- 53 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

1. Faulty start

1) No power on outlet.

2) No power on cord.

3) Shorted start circuit.

4) During defrost.

* Measuring instrument :

Multi tester

■Check the voltage. If the voltage is within ±85% of the rated voltage, it is OK.

■ Check the terminal movement.

■

Check both terminals of power cord. Power conducts : OK. No power conducts : NG

■ Check both thermostat terminals. Power conducts : OK. If not : NG.

■ Check both terminals of OLP. If power conducts : OK. If not : NG.

■ Check the resistance of both

terminals. At normal temperature 6 : OK. If disconnected : ∞.

Bad connection between adapter and outlet. (faulty adapter)

The Inner diameter of adapter. The distance between holes. The distance between terminals. The thickness of terminal.

Bad connection between plug and adapter (faulty plug).

The distance between pins. Pin outer diameter.

No power on power cord.

No electric power on thermostat.

OLP is off.

No electric power on compressor. - Faulty compressor .

Faulty PTC.

Disconnected copper wire.

Internal electrical short. Faulty terminal contact.

Disconnected.

Thermostat is off.- Gas leaks completely .

Faulty terminal connection. Capacity of OLP is small. Characteristics of OLP are out of spec. Bad connection.

Power is disconnected.

Sensor breakage. Sealed part leak. Bellows leak.

Inner Ni-Cr wire blows out. Bad internal connection. Faulty terminal caulking (Cu wire is cut). Bad soldering.

- Weak connection.

- Short inserted cord length.

- Worn out tool blade.

Loose contact.

- Large distance between male terminal.

- Thin female terminal.

T erminal disconnected. Bad sleeve assembly .

Power cord is disconnected. Faulty soldering.

Start automatic defrost. Cycle was set at defrost when the refrigerator

was produced.

Power does not conduct. - Damage. Bad characteristics. - Initial resistance is high. Bad connection with

compressor. Bad terminal connection.

T oo loose. Assembly is not possible.

Page 54

PROBLEM DIAGNOSIS

- 54 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

2. No cooling.

2) Refrigeration system is clogged.

■Check the clogged evaporator by heating (as soon as the cracking sound begins, the evaporator starts freezing)

■ The evaporator does not cool

from the beginnig (no evidece of moisture attached). The evaporator is the same as before even heat is applied.

Moisture clogged.

No electric power on thermostat.

Weld joint clogged.

Drier cloggeing.

Foreign material clogging.

Residual moisture

in the evaporator.

Residual moisture.

Insufficient drier capacity.

Residual moisture in pipes.

Moisture penetration - Leave it in the air. - Moisture penetration. into the refrigeration oil.

Caps are missed.

Air blowing.

During transportation. During work.

Not performed. Performed.

T oo short time. Low air pressure. Less dry air.

Air Blowing.

Leave it in the air. Caps are missed.

Short pipe insert. Pipe gaps.

T oo much solder .

T oo large. Damaged pipes.

Not dried in the compressor. Elapsed more than 6 months after drying Caps are missing. No pressure when it is open.

During rest time. After work.

Compressor cap is disconnected. Foreign materials are in the pipe.

Not performed. T oo short. Impossible moisture

confirmation. Low air pressure.

Dry drier - Drier temperature. Leave it in the air.

The capillary tube inserted too far. Capillary tube melts. - Over heat. Clogged with foreign materials.

Reduced cross section by cutting. - Squeezed.

Desiccant powder. Weld oxides. Drier angle.

Check on package condition.

Good storage after finishing.

Page 55

PROBLEM DIAGNOSIS

- 55 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration is weak.

Defrost thermostat

Plate heater

Cord heater

Melting fuse

1) Refrigerant Partly leaked.

2) Poor defrosting capacity. Drain path (pipe) clogged.

Defrost heater does not generate heat.

Weld joint leak. Parts leak.

Inject P/U into drain hose.

Foreign materials penetration.

Drain cap is not disconnected.

Inject through the hole.

Seal with drain.

P/U lump input. Screw input. Other foreign materials

input.

Parts disconnected.

Thermostat is cut.

- Bad caulking connection.

- Base material (Ammonia).

T erminal is corroded.

- Water penetration

Bad terminal contact.

Wire is cut.

- Heating wire.

- Contact point between heating and electric wire.

Dent by fin evaporator. Poor terminal contacts.

Wire is cut.

- Lead wire.

- Heating wire.

- Contact point between heating and electric wire.

Heating wire is corroded

- Water penetration.

Bad terminal connection.

The fuse blows out. Paraffin melted

- Welding flame.

Bad terminal contact.

■Check visually.

■Check terminal

Conduction: OK. No conduction: NG. If wire is not cut, refer to resistance. P=Power V=Voltage R=Resistance

P= —

R= —

Page 56

- 56 -

PROBLEM DIAGNOSIS

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration is weak.

3) Cooling air leak.

4) No cooling air circulation.

Residual frost.

No automatic defrosting. Defrost does not return.

Bad gasket adhestion

Door sag.

Faulty fan motor.

Weak heat from heater.

Bad heater assembly .

T oo short defrosting time. Defrost Sensor .

- Faulty characteristics. Seat-D(missing, location. thickness).

Structural fault. Gasket gap.

Air inflow through the fan motor. Bad insulation of case door.

Sheath Heater - rated. Heater plate - rated. Heater cord-L - rated.

Heater plate

Heater cord-L

Gap. Bad attachment. Contraction.

Bad adhesion. Weak binding force at hinge.

Fan motor.

Door switch.

Self locked. Wire is cut. Bad terminal contact.

Contact distance. Button pressure. Melted contact. Contact.

Poor door attachment. Door liner (dimension). Contraction inner liner. Misalignment. Bad terminal connection. P/U liquid leak.

Faults.

Refrigerator and freezer switch reversed. Button is not pressed.

No contact to drain. Loosened stopper cord.

Not contact to the evaporator pipe.

Location of assembly (top and middle).

■Check the fan motor conduction: OK. No conduction: NG.

Page 57

PROBLEM DIAGNOSIS

- 57 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration is weak.

4) No cooling air circulation.

5) Compressor capacity.

6) Refrigerant too much or too little.

7) Continuous operation

- No contact of temperature controller. - Foreign materials.

8) Damper opens continuously.

Foreign materials jammed.

Failed sensor. - Position of sensor. Characteristics

of damper.

9) Food storing place. - Near the outlet of cooling air.

Faulty fan motor.

Small cooling air discharge.

Fan is constrained.

Insufficient motor RPM

Faulty fan.

Shorud. Bent. Ice and foreign materials on rotating parts.

Fan shroud contact. - Clearance. Damping evaporator contact. Accumulated residual frost.

Fan misuse. Bad shape. Loose connection. - Not tightly connected. Insert depth.

Rating misuse. Small capacity. Low valtage.

Malfunction of charging cylinder. Wrong setting of refrigerant. Insufficient compressor. - Faulty compressor.

Fan overload. - Fan misuse. Bad low termperature RPM characteristics. Rated power misuse. Low voltage.

P/U liquid dump. EPS water sediment. Screw.

Bad characteristics of its own temperatue. Parts misuse. Charge of temperature - Impact.

characteristics.

■Check visually after disassembly.

Page 58

PROBLEM DIAGNOSIS

- 58 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

4. Warm refrigerator compartment temperature.

5. No automatic operation. (Faulty

contacts.)

6. Condensation and ice formation.

1) Clogged cooling path.

2) Food storate.

1) Faulty temperature sensor in freezer compartment.

2) Refrigeration load is too much.

3) Poor insulation.

4) Unit is hot.

5) Refrigerant leak.

6) Inadequate amount of refrigerant.

7) Weak compressor discharging power.

8) Fan does not work.

9) Button is positioned at strong.

1) Ice in freeezer compartment.

2) Condensation in the refrigerator compartment.

3) Condensation on liner foam.

P/U liquid leak. Foreign materials. –– P/U dump liquid.

Faulty contact. Faulty temperature characteristics.

Ext e r n a l a i r i n f l o w. –– Bushing motor assembly direction (reverse). Door opens but not closes.

Gap around gasket. –– Contraction, distortion, loose, door twisted, corner not

fully inserted.

Food vapor. –– Storing hot food. –– Unsealed food.

Door opens but doesn’t close.

Gasket gap.

Cool air leak and transmitted.

High ambient temperature. Space is not sufficiently ventilated.

Different rating. Small capacity.

Store hot food. Store too much at once. Door open. Packages block air flow.

Food. Frequent opening and closing.

Cool air leak. Poor door close. – Partly opened.

T oo much food. Hot food.

Weak door closing power . Stopper malfunction. Door sag. Food hinders door closing.

Insufficient closing. Door sag. Food hinders door closing.

T oop table part. Out plate R/L part.

Not fully filled.

Flange gap. –– Not sealed. Gasket gap.

■Inspect parts measurements and check visually.

Page 59

PROBLEM DIAGNOSIS

- 59 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

6. Condensation and ice formation.

7. Sounds

4) Dew on door. Dew on the duct door. - Duct door heater is cut. Dew on the dispense

recess.

Dew on the Not fully filled. Surface. door surface. Corner.

P/U liquid contraction.

Dew on the gasket surface.

5) Water on the floor. Condensation in the refrigerator compartment. Defrosted water overflows. Clogged discharging hose. Discharging hose Evaporation tray located at wrong place. location. Tray drip. Damaged.

Breaks, holes. Small Capacity.

Position of drain.

1) Compressor compartment operating sounds. Compressor sound Sound from machine itself.

Sound from vibration.

Restrainer. Bushing Too hard. seat. Distorted.

Aged. Burnt.

Stopper. Bad Stopper Not fit

assembly. (inner

diameter

of stopper). Tilted. Not inserted.

Compressor base not connected. Bad welding compressor stand fallen. Foreign materials in the compressor

compartment.

OLP

sound.

Chattering

sound. Capacitor noise. Insulation paper vibration. Pipe

sound. Pipe contacts each other. – Narrow interval.

No vibration damper. Damping Bushing-Q.

Damping Bushing-S.

Capillary tube unattached.

Recess Heater is cut. Duct door is open. / Foreign material clogging.

Bad wing adhesion. Wing sag(lower part).

Door liner shape mismatch.

Corner. Too much notch.

Broken.

Home Bar heater is cut.

Liquid shortage. Liquid leak.

Page 60

PROBLEM DIAGNOSIS

- 60 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

7. Sounds

1) Compressor compartment operating sounds. Transformer

sound.

Drip tray vibration sound.

Back cover machine sound.

Condenser drain sound.

2) Freezer compartment sounds. Fan motor sound.

Sounds from fan contact.

Unbalance fan sounds.

Motor shaft contact sounds.

Resonance. Evaporator noise.

3) Bowls and bottles make contact on top shelf.

4) Refrigerator roof contact.

5) Refrigerator side contact.

6) Insufficient lubricants on door hinge.

Its own fault. –– Core gap. Bad connection. –– Correct screw connection.

Bad assembly. Distortion. Foreign materials inside.

Bad connection. Partly damaged.

Not connected. Bad pipe caulking.

Normal operating sound. Vibration sound.

Aged bushing seat. Bad torque for assembling motor bracket.

Fan guide contact. Shroud burr contact. Damping evaporator contact. Residual frost contact.

Unbalance.

Ice on the fan. –– Air intake (opposite to motor

bushing assembly.)

Supporter disorted. Tilted during motor assembly .

Evaporator pipe contact. –– No damping evaporator. Sound from refrigerant. –– Stainless steel pipe shape in

accumulator. Sound from fin evaporator and pipe during expansion and contraction.

Damaged heater cord. Narrow evaporator interval.

Surface machining conditions. Fan distortion. Misshappen. Burr.

Page 61

PROBLEM DIAGNOSIS

- 61 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

8. Faulty lamp (freezer and

refrigerator compartment).

9. Faulty internal voltage (short).

1) Lamp problem. Filament blows out. Glass is broken.

2) Bad lamp assembly. Not inserted. Loosened by vibration.

3) Bad lamp socket.

Disconnection. Bad soldering.

Bad rivet contact.

Short. Water penetration. Low water

level in tray.

Bad elasticity of contact. Bad contact (corrosion).

4) Door switch. Defective

Refrigerator and freezer switch is reversed. Travel distance. Bad connection. Bad terminal contact. P/U liquid leak.

1) Lead wire is damaged.

Wire damage when assembling PTC Cover. Outlet burr in the bottom plate. Pressed by cord heater. lead wire, evaporator pipe.

2) Exposed terminal.

Compressor Compartment terminal. - Touching other

components.

Freezer compartment terminal. - Touching evaporator pipe.

3) Faulty parts.

Transformer. Coil contacts cover.

Welded terminal parts contact cover. Compressor. Bad coil insulation. Plate heater. Melting fuse. Sealing is broken. Moisture penetration. Cord heater. Pipe damaged. Moisture penetration.

Bad sealing. Sheath heater.

■Connect conduction and non-conduction parts and check with tester. Conduction: NG. Resistance∞: OK.

Page 62

PROBLEM DIAGNOSIS

- 62 -

CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

10. Structure, appearance and others.

1) Door foam. Sag.

Noise during operation.

Malfunction.

2) Odor. Temperature of

refrigerator compartment.

Deodorizer.

Food Storage.

Others.

Hinge loose

Weak gasket adhesion. Fixed tape.

Hinge interference.

Not closed Interference between door liner and inner liner. Refrigerator compartment is opened when freezer compartment is closed (faulty stopper).

High. Faulty damper control.

Button is set at weak. Door is open (interference by food).

No deodorizer. Poor capacity.

Seal condition. Store special odorous food. Long term storage.

Odors from chemical procucts.

Bigger door foam. Hinge-Pin tilted-Poor flatness. No washer. No grease or not enough quantity.

Stopper worn out. Bad freezer compartment door assembly. No stopper.

Bolt is loosened during Transportation. Not tightly fastened. Screw worn out . Adhesion surface.

Poorly applied.

Page 63

2. Faults

2-1. Power

2-2. Compressor

PROBLEM DIAGNOSIS

-63-

Problems Causes Checks Measures Remarks

No power on - Power cord cut. - Check the voltage with tester. - Reattach the components. outlet. - Faulty connector insertion. - Check visually. - Reattach the connecting parts.

- Faulty connection between plug - Check visually. - Reconnect the connecting parts. and adapter.

Fuse blows out. - Short circuit by wrong connection. - Check the fuse with tester - Find and remove the cause of - Replace with rated

- Low voltage products are or visually. problem(ex. short, high voltage, fuse after confirm connected to high voltage. - Check the input voltage with tester low voltage). its specification.

- Short circuit caused by insects. (between power cord and products). - Replace with rated fuse.

- Electricity leakage. - Check the resistance of power cord ■ If fuse blows out

- High voltage. with tester (if it is 0Ω, it is shorted). frequently, locate

- Short circuit of components the cause and remedy. (tracking due to moisture and dust

penetration).

Problems Causes Checks Measures Remarks

Compressor - Faulty PTC. - Check the resistance. - If resistance is infinite, replace it does not Value:∞ is defective. with new one. operate. - If it is not infinite, it is normal.

- Check other parts.

- Compressor is frozen. - If compressor assembly parts are - During forced operation:

normal(capacitor, PTC, OLP), - Operates: Check other parts. apply power directly to the - No operation: Replace the frozen compressor to force operation. compressor with new one, weld,

evacuate, and recharge refrigerant.

OLP It starts as soon as it is • Refer to weld repair procedures.

contacted.

Auxiliary winding Main winding

Power

Page 64

2-3. Temperature

PROBLEM DIAGNOSIS

-64-

Problems Causes Checks Measures Remarks

High Poor cool air circulation due to faulty - Lock –– Check resistance with a - Replace fan motor. temperature fan motor. tester. in the freezer 0Ω: short. compartment. ∞Ω: cut. - Reconnect and reinsert.

- Rotate rotor manually and check rotation.

- Wire is cut.

- Bad terminal contact: Check - Maintain clearance and remove ice terminal visually. (Repair and/or replace shroud if fan

- Fan constraint. – Fan shroud is constrained by shroud

contact: Confirm deformation). visually.

– Fan icing:

Confirm visually.

Faulty fan motor due to faulty door - Iced button (faulty) operation: - Determine icing cause and repair. switch operation. Press button to check - Replace door switch.

- Faulty button pressure and contact: Press button to check operation.

- Door cannot press door switch - Door sag: fix door. button: Check visually. - Door liner bent:replace door or

attach sheets.

Bad heating conditions in - Check the clearance between the - Keep clearance between - The fan may be compressor compartment. refrigerator and wall (50 mm in refrigerator and walls (minimum broken if cleaning

minimum). 50mm). is performed while the

- Check dust on the grill in - Remove dust and contaminants refrigerator is on. compressor compartment. from grill for easy heat transfer.

- Check dust on the coils condenser. - Remove the dust with vacuum

cleaner from the coils condenser while the refrigerator is off.

Page 65

2-4. Cooling

PROBLEM DIAGNOSIS

-65-

Problems Causes Checks Measures Remarks

High Refrigerant leak. Check sequence

Weld the leaking part, recharge the Drier must be replaced. temperature 1. Check the welded parts of the refrigerant. in the freezer drier inlet and outlet and drier compartment. auxiliary in the compressor

compartment (high pressure side).

2. Check the end of compressor sealing pipe (low pressure side).

3. Check silver soldered parts. (Cu + Fe / Fe + Fe).

4. Check bending area of wire condenser pipe in compressor compartment (cracks can happen during bending).

5. Check other parts (compressor compartment and evaporators in freezer compartment).

Shortage of refrigerant. Check frost formation on the surface - Locate the leaking area, repair, Drier must be replaced.

of evaporator in the freezer evacuate, and recharge the compartment. refrigerant.

- If the frost forms evenly on the - If not leaking, remove the

surface, it is OK. remaining refrigerant, and recharge

- If it does not, evaporator is not new refrigerant.

good.

Page 66

PROBLEM DIAGNOSIS

-66-

Problems Causes Checks Measures Remarks

High Cycle pipe is clogged. Check sequence. - Heat up compressor discharging Direr must be replaced. temperature in 1. Check temperature of condenser weld joints by contact, disconnect the freezer manually. the pipes, and check for clogging. compartment. If it is warm, it is OK. Remove the cause of clogging,

If it is not, compressor discharging weld, evacuate, and recharge joints might be clogged. the refrigerant.

2. Manually check whether hot line - If it's warm, it's OK. If it's not, pipe is warm. condenser discharging line weld If it is warm, it's OK. joints might be clogged. If it is not, condenser outlet weld Disconnect with torch, remove the joints might be clogged. causes, evacuate, and recharge

and seal refrigerant.

Leak at loop pipe weld joint Check sequence. Replace the compressor, weld, Drier must be replaced. (discharge) in compressor. 1. Manually check whether evacuate, and recharge refrigerant.

condenser is warm. If it is warm or hot, it is OK. If it is cool, proceed with repair.

Faulty cooling fan in the compressor Check sequence. - Replace if motor does not operate. compartment. 1. Check cooling fan operation. - If fan is disconnected, check for fan

2. Check that cooling fan is damage and reassemble it. disconnected from the motor. ■ Refer to fan motor disassembly

and assembly sequence.

Page 67

2-5. Defrosting failure

PROBLEM DIAGNOSIS

-67-

Problems Causes Checks Measures Remarks

No defrosting. Heater does not generate heat as 1. Check the resistance of heater. Heating wire is short or wire is cut. Seal the lead wire with

the heating wire is cut or the circuit 0Ω: Short. ∞Ω: Cut. • Parts replacement: Refer to parts insulation tape and heat is shorted. Tens to thousands Ω: OK. explanations. contraction tube if the cut

1) Heating wire is damaged when 2. Check the resistance between lead wire is accessible to inserting into the evaporator. housing terminal and heater repair.

2) Lead wire of heater is cut. surface.

3) Heating wire at lead wire contacts 0Ω: Short. ∞Ω: Cut. is cut. Tens to thousands Ω: Short.

Sucking duct and discharging hole 1. Confirm foreign materials. In case 1) Push out impurities by inserting are clogged: of ice, insert the copper line copper wire.(Turn off for more

1. Impurities. through the hole to check. than 3 hours and pour in hot water

2. Ice. 2. Put hot water into the drain if frost is severe.)

(check drains outside). 2) Put in hot water to melt down frost.

3) Check the water outlet.

4) Push the heater plate to sucking duct manually and assemble the disconnected parts.

Gap between Suction duct and 1. Check in the Suction duct. 1) Turn off the power, confirm Heater plate Ice in the gap. presence of impurities and ice in

the gap, and supply hot water until the ice in the gap melts down.

2) Push the Heater plate to drain bottom with hand and assemble the disconnected parts.

Wrong heater rating (or wrong 1. Check heater label. Faults: replace. assembly). 2. Confirm the capacity after - How to replace: Refer to main parts.

substituting the resistance value into the formula.

(V: Rated voltage of user country) (R: Resistance of tester[Ω]) Compare P and level capacity. Tolerance: ±7%

P= ––

Page 68

PROBLEM DIAGNOSIS

-68-

Problems Causes Checks Measures Remarks

No defrosting Melting fuse blows out. - Check melting fuse with tester. - Faullty parts: parts replacement.

1) Lead wire is cut. If 0Ω: OK. - Check wire color when measuring

2) Bad soldering. If ∞Ω: wire is cut. resistance with a tester. Ice in the Suction duct. 1. Check the inner duct with mirror. 1) Turn power off.

1) Icing by foreign materials in the 2) Raise the front side(door side), duct. support the front side legs, and let

2) Icing by cool air inflow through the ice melt naturally. (If power is the gap of heater plate. on, melt the frost by forced

3) Icing by the gap of heater plate. defrosting.)

2. Check by inserting soft copper 3) Reassemble the heater plate. wire into the duct (soft and thin copper not to damage heating wire).

Bad cool air inflow and discharge, 1. Turn on power, open or close the 1) Check the faulty connector of and bad defrosting due to faulty door, check that motor fan housing and reassemble contact and insertion (bad connector operates (If it operates, motor fan incorrectly assembled parts. insertion into housing of heater, is OK). 2) If the parts are very damaged, melting, fuse and motor fan). 2. Disconnect parts in the refrigerator remove the parts and replace it

compartment, check the connection

with a new one. around the housing visually, defrost, and confirm heat generation on the heater. Do not put hands on the sheath heater.

3. Check the parts which have faults described in 1, 2 (mechanical model: disconnect thermostat from the assembly).

Page 69

2-6. Icing

PROBLEM DIAGNOSIS

-69-

Problems Causes Checks Measures Remarks

Icing in the 1) Bad circulation of cool air. - Verify the food is stored properly - Be acquainted with proper use. - Check the defrost refrigerator - Clogged intake port in the (see it discharge and intake port - Seal on connecting parts. related parts if problem compartment. refrigerator compartment. are blocked). - Check the damper and replace is caused by faulty

- Damper icing. - Seal is not good. - Check icing on the surface of it if it has defects. defrosting.

- Pipe icing. - Too much food is stored and baffle and cool air path (pipe) after - Check defrost. (After forced

- Discharging blocks the discharge port. dissembling the container box. defrosting, check ice in the pipe icing. - Bad defrosting. - Check icing at intake ports of evaporator and pipes.)

freezer and refrigerator compartment.

2) Faulty door or refrigerator - Check gasket attachment. - Correct the gasket attachment - Replacement should compartment. - Check door assembly conditions. conditions or replace as necessary. be done when gasket

- Faulty gasket. - Door assembly and replacement. cannot be repaired.

- Faulty assembly.

3) Overcooling in the refrigerator - See if refrigerator compartment - Replace faulty parts. compartment. is overcooling (when button

- Faulty damper in the refrigerator pressed on weak). compartment. - Check for faulty parts.

- Faulty MICOM (faulty sensor)

4) Bad defrosting - Check frost on the evaporator - Check parts related to defrosting. - Moisture does not

- Heater wire is cut. after dissembling shroud and fan - Check defrosting. (Check ice on the on the evaporator but

- Defective defrost sensor. grille. evaporator and pipe.) is sucked into the

- Defrosing cycle. - Check for ice on intake port of refrigerator, being

freezer and refrigerator condenses and ices, compartments. with coolain circulation,

and suppressing sublimation.

5) Customers are not familiar with - Check food interfering with door - Acquaint customers with how to this machine. closing. use.

- Door is left open. - Check ice on the ceilings.

- High temperature, high moisture, and high load.

Page 70

PROBLEM DIAGNOSIS

-70-

Problems Causes Checks Measures Remarks

Ice in the freezer 1) Bad cool air circulation. - Check food storage conditions - Be acquainted with how to use. - Check the parts related compartment. - Intake port is clogged in the freezer visually.(Check clogging at intake - Check defrost (Check for ice on the to defrosting if the

- Surface of fan compartment. and discharge ports of cool air.) evaporator and pipes after forced problem is caused by grille. - Discharging port is clogged. - Check food occupation ratio in defrosting). the faulty defrosting.

- Wall of freezer - Too much food is stored. volume(Less than 75%). compartment. - Bad defrosting. - Check frost on the evaporator after

- Cool air dissembling shroud and fan grille. discharging port.

- Check for icing at intake port of

- Basket(rack) refrigerator compartment. area.

- Food surface. 2) Bad freezer compartment door - Check gasket attachment - Correct the gasket attachement - Replace gasket when it

- Icing in the - Faulty gasket conditions. conditions and replace it. cannot be repaired. shute. - Faulty assembly - Check door assembly conditions. - Door assembly and replacement.

3) Over freezing in the freezer - Refrigerator operation pulls down. -Replace defective parts. compartment. (Check if it is operates

- Faulty MICOM. intermittently)

- The Temperature of freezer compartment is satisfactory, but over freezing occurs in the refrigerator compartment even though the notch is set at weak.

4) Bad defrosting. - Check frost on the evaporator after - Check parts related to defrosting.

- Heater wire is cut. dissembling shroud and grille. - Check defrosting. Check ice on the

- Faulty defrost sensor. - See if ice is the intake port in the evaporator and pipes after forced

- Defrosting cycle refrigerator compartment. defrosting.

5) User is not familiar with how to - See if food holds doors are open. - Be acquainted with how to use. operate. - See if ice on the ice tray.

- Door remains opened.

- High moisture food water is stored.

Page 71

2-7. Sound

PROBLEM DIAGNOSIS

-71-

Problems Causes Checks Measures Remarks

Hiss sound 1. Loud sound of compressor 1.1 Check the leveling of the 1) Maintain horizontal level.

operation. refrigerator. 2) Replace bushing and seat if they

1.2 Check the bushing seat are sagged and aged. conditions (sagging and aging). 3) Tuch the piping at various

place along is route. Install a dampe at the point where your tuch reduces the noise.

2. Pipes resonate sound which is 2.1 Check the leveling of pipes 4) Avoid pipe interference. comes from the compressor. connected to the compressor 5) Replace defective fan and fan

and their interference. motor.

2.2 Check bushing inserting 6) Adjust fan to be in the center of conditions in pipes. the fan guide.

2.3 Touch pipes with hands or screw 7) Leave a clearance between

- driver (check for change of interfering parts and seal gaps in

sound). the structures.

8) Reassemble the parts which

3. Fan operation sound in the freezer 3.1 Check fan insertion depth and make produce sound. compartment. see if there is blade damage. 9) Make a clearance if evaporator

3.2 Check for interference with pipes and suction pipe contact structures. freezer shroud.

3.3 Check fan motor.

3.4 Check fan motor bushing insertion and aging conditions.

4. Fan operation sound in the 4.1 Same as fan confirmation in the compressor compartment. refrigerator.

4.2 Check drip tray leg insertion.

4.3 Check the screw fastening conditions at condenser and drip tray.

Page 72

PROBLEM DIAGNOSIS

-72-

Problems Causes Checks Measures Remarks

Vibration sound. 1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts (Clunk) the refrigerator. shelves in the refrigerator and insert foam or cushion where

2. Pipe interference and capillary 1-2. Check light food and container vibration is severe. tube touching in the compressor. on the shelves. 2) Leave a clearance where parts compartment. 2-1. Touch pipes in the compressore would otherwise interfere with

3. Compressor stopper vibration. compartment with hands. each other.

4. Moving wheel vibration. 2-2 See if capillary tube touches 3) Reduce vibration with bushing

5. Other structure and parts cover back. and restrainer if it is severe. vibration. 3-1 Check for compressor stopper (especially, in compressor and

vibration. pipes).

4-1 Check for vibration of front and 4) Replace compressor stopper if it

rear moving wheels. vibtates severely.

5-1 Touch other structures and parts.

Irregular sound. 1. It is caused by heat expansion 1-1 Check time and place of sound 1)

Explain the principles of refrigeration

(Click). and contraction of evaporator, sources.

and that the temperature difference

shelves, and pipes in the

between operation and defrosting

refrigerator.

can produce sounds.

If evaporator pipe contacts with other structures, leave a clearance between them (freezer shroud or inner case).

Page 73

PROBLEM DIAGNOSIS

-73-

Problems Causes Checks Measures Remarks

Whining Sound It happens when refrigerant expands

- Check the sound of refrigerant at the - Check the restrainer attached on the (almost the same at the end of capillary tube. initial installation. evaporator and capillary tube weld as animals crying - Check the sound when the refrigerator joints and attach another restrainer. sound). starts operation after forced defrosting. - If sound is continuous and servere, insert

- Check the restrainer attachment capillary tube again (depth 15±3mm)

conditions on the evaporator and - Fasten the capillary tube to suction capillary tube weld joints. pipes or detach in the compressor

compartment.

- Explain the principles of the freezing cycle.

Water boiling or This happens when refrigerant passes - Check for the sound when compressor - Explain the principles of freezing cycles flowing sound. orifice in accumulator’s internal pipes is turns on. and refrigerant flowing phenomenon by

due to the pressure difference between - Check for the sound when compressor internal pressure difference. condenser and evaporator. is turns off. - If sound is servere, wrap the

accumulator with foam and restrainer.

Sound of whistle When door closes, the internal pressure - Check the sound by opening and - Broaden the cap of discharge hose for when door of the refrigerator decreases sharply closing the refrigerator or freezer doors. defrosting in the compressor closes. below atomosphere and sucks air into compartment.

the refrigerator, making the whistle - Seal the gap with sealant between out sound. and inner cases of hinge in the door.

Page 74

2-8. Odor

PROBLEM DIAGNOSIS

-74-

Problems Causes Checks Measures Remarks

- Dry deodorizer in the bright well ventilated place.

- Store the food in the closed container instead of vinyl wraps.

- Clean the refrigerator and set the cooling to strong.

- Clean the refrigerator.

- Persuade customers not to use plastic bag or wraps with wet food or odorous foods.

- Dry the deodorizer with dryer and then in a birght and well ventilated place.

- Remove and replace the deodorants.

- Check to see if food is not wrapped.

- See if the shelves or inner wall are stained with food juice.

- Check the food in the adhesive wraps.

- Check food for spoilage.

- See if wet food is wrapped with plastic bowl or bag.

- Certain odors are common in new refrigerator.

- Check the deodorizer odors.

Food (garlic, kimchi, etc)

Odors of mixed food and plastic odors.

Odor from the old deodorizer.

Food Odor.

Plastic Odor.

Odor from the deodorizer.

Page 75

2-9. Micom

PROBLEM DIAGNOSIS

-75-

Problems Symptom Causes Checks Measures Remarks

Bad PCB All display Bad connection Bad connector Visual check on connector Reattach electric power. LCDS are off. between Main PCB connection from main connection. connector.

and display circuit. PCB to display PCB.

Defective PCB PCB transformer Check resistance of PCB Replace PCB Applicable to transformer winding is cut. trans input and output transformer or PCB. model without

PCB transformer terminals with a tester. dispenser. temperature fuse (If resistance is infinity, is burnt out. trans winding is cut).

DefectivePCB electric Defective regulator IC Check voltage at input/output Replace regulator. Refer to electric circuit parts. (7812, 7805). terminals. circuit in circuit

explanation. PCB electric terminal Check fuse in PCB electric Replace PCB fuse. fuse is burnt out. terminal with a tester. STR Parts are Check if STR No. 2 and 3 pins Replace parts. Applicable to damaged. are cut when power is off. model with

dispenser.

Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect Lead display LCD between Main PCB main PCB and display connecting Main PCB and Wire and directly operation and display circuit. PCB is cut or connector display PCB with a tester. connect defective

terminal connection is contact terminal to bad. Lead Wire.

Defective LCD Defective LCD. Check if all LCDs are on when Replace display Refer to display module. Main PCB Test switch is PCB. circuit in circuit

pressed (or when both freezer explanation. key and power freezer key are pressed at the same time for more than one second.)

Page 76

PROBLEM DIAGNOSIS

-76-

Problems Symptom Causes Checks Measures Remarks

Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead

temperature is not start. is cut. with a tester. Wire. high. Defective compressor Measure voltage at PCB CON5 Replace relay RY1 Refer to load

drive relay. (3&9) after pressing main PCB and RY14 or PCB. driving circuit in

test switch once. It is OK if circuit voltage is normal. explanation.

Defective freezer Defective Freezer Check resistance of freezer Replace freezer Refer to sensor. sensor parts. sensor with a tester. sensor. resistance

characteristics

table of sensor in

circuit Freezer sensor is Confirm the color of sensor in Repair main PCB explanation. substituted for other circuits (main PCB sensor sensor housing sensor. housing).

Defective freezer fan Fan motor lead wire Check fan motor lead wire Reconnect lead motor. is cut. with a tester. wire.

• Defective door switch Measure the voltage between • Replace door Refer to load

(freezer, refrigerator, PCB power blue line and fan switch

(freezer,

drive circuits in

home bar). motor after pressing test switch

refrigerator

and circuit

• Defective fan motor. of Main PCB. If the voltage is home bar). explanation.

• Defective fan motor normal, it is OK. • Replace fan motor.

drive relay. • Replace relay RY5

& RY6 or PCB.

Faulty defrost. Refer to faulty defrost items in problem diagnosis Refer to problem

functions. diagnosis

function.

Page 77

PROBLEM DIAGNOSIS

-77-

Problems Symptom Causes Checks Measures Remarks

Bad cooling Wrong Defective AC Damper. Check AC damper Using a tester, see if AC Reconnect lead

Refrigerator motor and reed switch damper motor and reed switch wire. temperature. and lead wire are cut. lead wire are cut with a tester.

Check AC damper Refer to AC damper in parts Replace AC damper part. repair guide. or refrigerator control

box ASSEMBLY. Check AC damper Refer to AC damper in parts Replace relay or Refer to single Motor drive relay in repair guide. PCB. motor damper PCB. drive circuits

in circuit

explanation. Foreign materials in AC Check AC damper baffle Remove foreign damper baffles visually. materials. Ice formation on AC Check if AC damper Heater Replace AC damper damper baffles wire is cut with a tester. or refrigerator control

Box ASSEMBLY.

Defective refrigerator Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor sensor sensor parts. refrigerator sensor with a tester. sensor. resistance

characteristic

table in circuit

explanation. Refrigerator sensor is Visually inspect the sensor Repair main PCB substituted for other color in the circuit. (main PCB sensor housing. sensor. sensor housing.) Defective refrigerator Visually if refrigerator sensor Reposition the sensor assembly is not fixed at cover sensor but refrigerator sensor. condition. inner case visually.

Page 78

PROBLEM DIAGNOSIS

-78-

Problems Symptom Causes Checks Measures Remarks

Bad defrost. Defrost is not Defrost lead wire is cut. Using a tester, check if defrost lead Reconnect Lead

working. wire is cut with a tester. Wire.

Defective defrost drive relay. Check the voltage of CON5 (1 and 7) Replace relay (RY 7 Refer to load

with a tester after pressing main and RY 14) or PCB. driving conditions PCB test switch twice. check in circuit If the voltage is normal then relay is OK. explanation.

Defective defrost sensor parts. Check the resistance of defrost sensor Replace defrost Refer to sensor

with a tester. sensor. resistance

characteristic

table of circuit

explanation.

Defective Buzzer Defective connecting lead wire from Check lead wire related to door Repair lead wire. buzzer continuously main PCB to door switch. switch with a tester.

rings or door Defective door switch parts. Refer to door switch in parts repair Replace door switch. opening alarm guide. does not work.

Defective Buzzer does Key input wire is cut or bad connector Check input wire with a tester. Reconnect lead Refer to display display button not ring and terminal contact in main PCB and wire and replace or circuit in circuit

key does not display PCB connecting lead wire. directly connect bad explanation. function when contact terminal to pressed. lead wire.

Key is continuously depressed due to Disassemble frame display and confirm Adjust or replace structural interference. visually. interfering

structures.

Page 79

PROBLEM DIAGNOSIS

-79-

Problems Symptom Causes Checks Measures Remarks

Defective Buzzer rings Trouble mode indication. Check problem diagnosis function. Remedy faults Refer to mode display button. but key does indication in

function when function button is explanations. pressed.

Bad water/ice Buzzer Defective connecting lead wire from Check lead wire associated with door Repair lead wire. Check model dispenser. continuously main PCB to door switch. switch. with dispenser.

rings or door Defective freezer compartment door Refer to door switch in parts repair Replace Freezer open alarm switch parts. guide. compartment door does not work. switch.

Ice and water Defective connecting lead wire from Check Lead Wire associated with lever Repair lead wire. do not Main PCB to lever switch. switch with a tester. dispensed. Defective lever switch parts Refer to door switch in parts repair guide. Replace lever switch.

Defective photo coupler IC parts. Check voltage change at photo coupler Replace photo

output terminals when lever switch coupler IC or PCB. pressed. It is OK if voltage change is

from 0V - 5V. Defective relay associated with ice Check relay (RY9, RY11, RY12) Replace defective dispense (geared motor, cube and with a tester. relay. dispenser solenoid). Defective parts associated with ice Check resistance of parts with a tester. Replace defective dispenser (geared motor, cube and parts. dispenser solenoid). Defective relay associated with water Check relay (RY10) with a tester Replace defective dispenser. relay. Defective parts associated with water Check resistance of parts with a tester. Replace defective dispenser. parts.

Page 80

3. Cooling Cycle Heavy Repair

3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant

NOTE) Please contact Songso company on +82-53-554-2067 if you have inquiry on heavy repair special facility.

PROBLEM DIAGNOSIS

- 80 -

NO.

Items Unit Standards Purposes Remarks

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

- Refit to repair note in each part.

- R134a refrigerant is more susceptible to leaks than R12 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 there is no make noise when removing bushing cap blow dry air or N2 gas for more than 1 min before using the parts.

Note: Only applicable to models equipped with

reverse flow protect plate.

Vaccum efficiency can be improved by operating compressor during evacuation.

The bushing pipes for R12 refrigerant will melt when they are used for R134a refrigerant causes of leak.

- Do not weigh the refrigerant in too hot or too cold an area.(25°C [77°F] is adequate.)

- Use copper charging canister Socket: 2SV Plug: 2PV R134a

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

welding.

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

- The electronic leak detector is very sensitive to halogen gas in the air. It also can detect R141b in urethane. Please practice, therefore, many times before use.

To protect

from

Moisture

Intrusion.

To protect

from oxide

scale

formation.

To protect

from

moisture

penetration.

To remove

moisture.

To protect

mixing of

mineral and

ester oils.

T o protect R12

Refrigerant

mixing.

˝ ˝

Do not mix

with R12

refrigerant.

To remove

the

moisture

from pipe.

Detect

refrigerant

leak area.

Pipe: within 1 hour. Comp: within 10

minutes.

Drier: within 20

minutes.

Weld under Nitrogen atmosphere (N

2 pressure: 0.1~0.2

kg/cm2)

Confirm air leaking sounds when removing bushing 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

Use R134a exclusive manifold.

Use R134a exclusive.

R134a exclusive. R134a exclusive Use R134a

exclusively. Weighing allowance: ±5g Note:Winter: -5g Summer: +5g

Use R134a exclusively for R134a refrigerator

Use R12 exclusively for R12 refrigerator

Replace drier whenever repairing refrigerator cycle piping.

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

Min.

Nitrogen

Pressure.

Confirm

N2 leak.

Min.

Torr

Evacuation time

Vacuum degree

Vacuum

Vacuum piping

Pipe coupler

Outlet (Socket)

Plug

Pipe and piping system opening time.

Welding.

2 sealed parts.

Refrigeration Cycle.

Refrigerant weighing.

Drier replacement.

Leak check.

Page 81

3-2. Summary Of Heavy Repair

PROBLEM DIAGNOSIS

- 81 -

Process Contents Tools

- Cut charging pipe ends and discharge refrigerant from Filter, side cutters drier and compressor.

- Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N

2 gas

- Confirm N

2 sealing and packing conditions before use.

Use good one for welding and assembly.

- Weld under nitrogen gas atmosphere.(N

2 gas pressure:

0.1-0.2kg/cm

- Repair in a clean and dry place.

- Evacuate for more than forty minutes after connecting Vacuum pump R134a manifold gauge hose and vacuum pump to high (drier) exclusively, Manifold gauge. and low (compressor refrigerant discharging parts) pressure sides.

- Evacuation Speed:113liters/minute.

- Weigh and control the allowance of R134a chargine R134a exclusive chargine canister in a vacuum conditions to be ±5 g with canister (mass cylinder), electronic scales andcharge through compressor inlet refrigerant R134a manifold gauge, (Charge while compressor operates). electronic scales, punching

- Weld carefully after pinching off the inlet pipe. off flier, gas welding machine

- Check for leakage at weld joints. Electronic Leak Detector,

Minute leak: Use electronic leak detector Driver(Ruler). Big leak: Check visually.

Note:Do not use soapy water for check.

- Check cooling capacity

➀ Check radiator manually to see if warm. ➁ Check hot line pipe manually to see if warm. ➂ Check frost formation on the whole surface of the

evaporator.

- Remove flux from the silver weld joints with soft brush Copper brush, Rag, Tool box

or wet rag. Flux may be the cause of corrosion and leaks.

- Clean R134a exclusive tools and store them in a clean tool box or in their place.

- Installation should be conducted in accordance with the

standard installation procedure. Leave space of more than 5 cm from the wall for compressor compartment cooling fan mounted model.

Problem

diagnosis

Remove refrigerant

Residuals

Parts

replacement

and welding

Compressor

compartment

and tools

arrangement

Transportation

and

installation

Check

refrigerant leak

and cooling

capacity

Vacuum

Refrigerant

charging and

charging

inlet welding

Page 82

3-3. Precautions During Heavy Repair

PROBLEM DIAGNOSIS

- 82 -

Items Precautions

1. Use of tools. 1) Use special parts and tools for R134a.

2. Removal of retained 1) Remove retained refrigerant more than 5 minutes after turning off a refrigerator. refrigerant. (If not, oil will leak inside.)

2) Remove retained refrigerant by cutting first high pressure side (drier part) with a nipper and then cut low pressure side. (If the order is not observed, oil leak will occur.)

3. Replacement of drier. 1) Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant.

4. Nitrogen blowing 1) Weld under nitrogen atmosphere in order to prevent oxidation inside a pipe. welding. (Nitrogen pressure : 0.1~0.2 kg/cm

5. Others. 1) Nitrogen or refrigerant R134a only should be used when cleaning and sealing inside

of cycle pipes inside and sealing.

2) Check leakage with an electronic leakage tester.

3) Be sure to use a pipe cutter when cutting pipes.

4) Be careful not to let the water let intrude into the inside of the refrigerant cycle path.

Compressor

Evaporator

Drier

Low pressure side

Condenser

High pressure side

Page 83

3-4. Practical Work For Heavy Repair

PROBLEM DIAGNOSIS

- 83 -

Items Precautions

1. Removal of residual

refrigerant.

1) Remove residual refrigerant more than 5 minutes later after turning off the refrigerator. (Otherwise, compressor oil may leak inside.)

2) Remove retained refrigerant slowly by cutting first high pressure side (drier part) with a nipper followed by cutting the low pressure side.

2. Nitrogen blowing welding.

When replacing a drier:

Weld  and  parts by blowing nitrogen(0.1~0.2kg/cm

) to high pressure side after

assembling a drier.

When replacing a compressor:

Weld  and  parts by blowing nitrogen to the low pressure side. Note) For other parts, nitrogen blowing is not necessary because not all welding is performed

for a long enough time to produce oxidation scales.

3. Replacement of drier.

Inserting a capillary tube

Measure distance with a ruler and put a mark(12

+3/-0

)on the capillary tube. Insert tube to the

mark and weld it

NOTE:

Observe the sequence for removal of refrigerant. (Otherwise, compressor oil may leak.)

NOTE:

Welding without nitrogen blowing produces oxidized scales inside a pipe, which affect on performance and reliability of a product.

NOTE:

Be sure to check the inserted length of capillary tube when it is inserted. (If too much is inserted, the capillary tube is blocked by a filter.)

Compressor

Low pressure side

Condenser

High pressure side

Drier

Evaporator

Release

Refrigent

Intake

Suction

1 2 1

Evaporator

Drier

High pressure side

Condenser

Refrigent

Intake

-0

Filter

* Unit : mm

Page 84

PROBLEM DIAGNOSIS

- 84 -

Items Precautions

4.Vacuum degassing.

Pipe Connection

Connect a red hose to the high pressure side and a blue hose to the low pressure side.

Vacuum Sequence

Open valves  and  and evacuate for 40 minutes. Close valve .

5.Refrigerant charging.

Charging sequence

1) Check the amount of refrigerant supplied to each model after completing vacuum degassing.

2) Evacuate bombe with a vacuum pump.

3) Measure the amount of refrigerant charged.

- Measure the weight of an evacuated charging canister with an electronic scale.

- Charge refrigerant into a charging canister and measure the weight. Calculate the weight

of refrigerant charged into the bombe by subtracting the weight of the evacuated bombe.

NOTE:

- If power is applied during vacuum degassing, vacuum degassing shall be more effective.

- Operate compressor while charging refrigerant. (It is easier and more certain to do like this.)

NOTE:

- Be sure to charge the refrigerant at around 25°C [77°F].

- Be sure to keep -5g in the winer and +5g in summer

the amount of refrigerant charged= a weight after charging a weight before charging (the weight of an evacuated cylinder)

Calculation of amount of refrigerant charged

Evaporator

Suction pipe

Compressor

Drier

Condenser

2 1

Low

pressure

Blue

Yellow

Vaccum

Pump

High

pressure

Red

R134a

Indicates the weight of an evacuated bombe

Page 85

3-5. Standard Regulations For Heavy Repair

PROBLEM DIAGNOSIS

- 85 -

Items Precautions

4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above.

5) Pinch a charging pipe with a pinch-off plier after completion of charging.

6) Braze the end of a pinched charging pipe with copper brazer and perform a gas leakage

test on the welded parts.

6. Gas-leakage test * Take for leaks on the welded or suspicious area with an electronic leakage tester.

7. Pipe arrangement Verify that each pipe is placed in its in each cycle original location before closing a cover

after completion of work. Particularly check the size of Joint Drain Pipe

1) Observe the safety precautions for gas handling.

2) Use JIG (or wet towel) in order to prevent electric wires from burning during welding. (In order to prevent insulation damage and consequent accidents.)

3) The inner case shall will melt and the insulation material (polyurethane) shall be damaged if care is not taken during welding of inner case parts.

4) The copper piping wil oxidize from overheating if care is not taken during welding.

5) Do not allow aluminum and copper pipes to touch. (In order to prevent corrosion.)

6) Observe that the inserted length of a capillary tube into a drier should be 12 mm.

7) Make sure that the inner diameter is not be distorted while cutting a capillary tube.

8) Be sure that a suction pipe and a filling tube are not be substituted for each other during welding. ( High efficiency pump.)

-0

Evaporator

Compressor

Drier

Condenser

Bombe

Bushing

Molecular Sieves

-0

12 mm

Drier

Molecular Pipe

Page 86

3-6. Brazing Reference Drawings

PROBLEM DIAGNOSIS

- 86 -

PIPE ASSEMBLY, JOINT

PIPE ASSEMBLY, HOT LINE

(Refrigerator)

PIPE ASSEMBLY, HOT LINE

(Freezer)

PIPE ASSEMBLY, JOINT

CONDENSER ASSEMBLY, WIRE

PIPE ASSEMBLY, SUCTION

DRIER ASSEMBLYCAPI - TUBE

Copper Brazer

Silver Brazer

Copper Brazer

Coppper Brazer

Silver Brazer

Page 87

4. HOW TO DEAL WITH CLAIMS

4-1. Sound

PROBLEM DIAGNOSIS

- 87 -

Problems Checks and Measures

Hiss sounds ■ Explain general principles of sounds.

• All refrigerator when functioning properly have normal operating sound. The compressor and fan produce sounds. There is a fan in the freezer compartment which blows cool air to freezer and refrigerator compartments. Hiss sounds are heard when the air passes through the narrow holes into the freezer and refrigerator compartments.

■ Cooling Fan sound in the compressor compartment.

• There is a fan on the back of the refrigerator, which cools the compressor compartment. If there is a small space between the refrigerator and the wall, the air circulation sounds may be noticeable.

■ Noise of Compressor.

• This operating sound happens when the compressor compresses the refrigerant. The compressor rotates at 3600RPM. The sound of compressor operation becomes louder as the refrigerator capacity increases.

Click sounds ■ Explain the principles of temperature change.

• The sounds happens when pipes and internal evaporator in the refrigerator compartment expand and contract as the temperature changes during the refrigerator operation. This sound also happens during defrosting, twice a day, when the ice on the evaporator melts.

Clunk sound ■ Explain that it comes from the compressor when the refrigerator starts.

• When the refrigerator operates, the piston and motor in the compressor rotate at 3600RPM. This clunk sound is caused by the vibration of motor and piston when they start and finish their operation. This phenomena can be compared with that of cars. When the car engine ignites and starts to rotate, the loud sound quickly becomes quiet. When the engine stops, it stops with vibration.

Vibration sound ■ Check whether the sound whether it comes from the pipes vibration and

friction.

• Insert bushing or leave a space between pipes to reduce the noise.

• Fix the fan blade if the noise is due to the collision of fan and shroud.

• Fix the drip tray if it is loose.

■ Sound depends on the installation location.

• Sound becomes louder if the refrigerator is installed on a wooden floor or near a wooden wall. Move it to the another location.

• If the refrigerator is not leveled properly, a small vibration can make a loud sound. Please adjust the leveling of the refrigerator.

Page 88

PROBLEM DIAGNOSIS

- 88 -

Problems Checks and Measures

Sounds of water flowing ■ Explain the flow of refrigerant.

• When the refrigerator stops, the water flowing sound occurs. This sound happens when the liquid or vapor refrigerant flows from the evaporator to the compressor.

Click sounds ■ Explain the characteristics of moving parts.

• This noise comes from the MICOM controller's switch on the top of the refrigerator when it is turns on and off.

Noise of Icemaker operation ■ Explain the procedure and principles of Icemaker operation. (applicable to model with Icemaker). • Automatic Icemaker repeats the cycle of water supplying ➝ icemaking ➝ ice

- Noise produced by ice dropping ejection. When water is supplied, the water supply valve in the machine room and hitting ice bin. makes sounds like Hiss and water flowing also makes sound. When water

- Hiss noise, motor sounds . freezes to ice, freezing sounds such as click, click are heard. When ice is being

ejected, sounds like Hiss produced by a motor to rotate an ice tray and ice dropping and hitting ice bin sounds are also heard.

Noise when supplying water. ■ Explain the principles of water supplied to dispenser.

• When the water supply button in the dispenser is pressed, the water supply valve in the compressor compartment opens and let the water flow to the water tank in the lower part of the refrigerator compartment. The water is dispensed by this pressure. When this happens, motor sound and water flowing sound are heard.

Noise when supplying ice. ■ Explain the principles of ice supply and procedure of crushed icemaking in a

dispenser.

• When ice cube button is pressed, ice stored in the ice bin is moved by a Helix Pusher and dispensed. If crushed ice button is pressed, the cube ice is crushed. When this happens, ice crushing and hitting ice bin sounds are heard.

Page 89

4-2. Measures for Temperature Related Symptoms

PROBLEM DIAGNOSIS

- 89 -

Problems Checks and Measures

Refrigeration is weak. ■ Check temperature set by the temperature control knob.

• Refrigerator is generally delivered with the button set at normal use (MID). But customer can adjust the temperature set depending on preference. If you feel the refrigeration is weak, then set the temperature control button at strong position. If you adjust the setting for the freezer compartment as well, the refrigeration is stronger than adjusting refrigerator only.

The food in the chilled drawer is . ■ The chilled drawer does not freeze food. not frozen but defrosted • Use chilled drawer for storing fresh meat or fish for short periods. For storing for

a long periods or freezing food, use a freezer compartment. It is normal that frozen foods thaw above the freezing temperature (in the chilled drawer).

Refrigerator water is not cool. ■Check the water storage location.

• If water is kept in the door rack, recommend storing it in the refrigerator compartment shelf. It will then become cooler.

Ice cream softens. ■ Explain the characteristics of ice cream.

• The freezing point of ice cream is below -15°C[5°F]. Therefore ice cream may melt if it is stored in the door rack.

• Store ice cream in a cold place or set the temperature control button of a freezer to strong setting.

Refrigeration is too strong. ■ Check the position of temperature control setting.

• Check if refrigeration is strong in whole area of the refrigerator or partly near the outlet of the cooling air. If it is strong in whole area, set the control button to weak. If it is strong only near the outlet of cool air, keep food (particularly wet and easy to frozen such as bean curd and vegetables) away from the outlet.

Vegetables are frozen. ■Check the vegetables storage.

• If vegetables are stored in the refrigerator shelf or chilled drawer instead of vegetable drawer, they will be frozen. Set the control button to weak if they are also frozen in the vegetable drawer.

The food stored at inside of ■ Check if food is stored near the outlet of the cooling air. the shelf freezes even the • The temperature at cooling air outlet is always below the freezing point. control button is set to MID. Do not store food near the outlet of the cooling air as it blocks the air circulation.

Do not block the outlet. If the outlet of the cooling air is blocked, the refrigerator compartment will not be cooled.

Page 90

4-3. Odor and Frost

PROBLEM DIAGNOSIS

- 90 -

Problems Checks and Measures

Odor in the refrigerator compartment.

■ Explain the basic principles of food odor.

• Each food has its own particular odor. Therefore it is impossible to prevent or avoid food odor completely when food is stored in a completely sealed refrigerator compartment. The deodorizer can absorb some portions of the odor but not completely. The intensity of odor depends on refrigerator conditions and environment.

■ Check the temperature control button and set to strong.

• Clean inside of the refrigerator with detergent and remove moisture. Dry inside the refrigerator by opening the door for about 3 or 4 hours and then set the temperature control button to strong.

Frost in the freezer compartment ■ Explain the basic principles of frost formation.

• The main causes for frosting:

- Door is left open.

- Air penetration through the gasket

- Too frequent door opening. (parties. etc.)

- Hot foods are stored before they are cooled down. The temperature of freezer

is -19°C[-2.2°F]. if temperature is set at MID. If hot air comes into the refrigerator, fine frost forms as cold air mixes with hot air. If this happens quite often, much frost forms inside of the refrigerator. If the door is left open in summer, ice may form inside of the refrigerator.

Frost in ice tray. ■ Explain basic principles of frost formation.

• When ice tray with full of water is put into a freezer compartment, the water evaporates. If cool air fan operates, the moisture attached to the jaw (protruded part) of ice mold will freeze and form frost. If warm water was put into the ice mould, the situation will become worse.

Page 91

4-4. Others

PROBLEM DIAGNOSIS

- 91 -

Problems Checks and Measures

The refrigerator case is hot. ■ Explain the principles of radiator.

• The radiator pipes are installed in the refrigerator case and partition plate between the refrigerator and the freezer compartment in order to prevent condensation formation. Particularly in summer or after installation of refrigerator, it may feel hot but this is normal. If there is not enough space to dissipate heat, the case may be hotter due to lack of heat radiation. Please install the refrigerator in a well-ventilated place and leave a clearance between refrigerator and wall:

Small holes in a door liner ■ Explain that the hole is for releasing gas.

• A small hole in the door liner is for releasing gas during insulation materials lining work. With a release hole, forming can be easily accomplished.

Electric bills are too expensive. ■ Check the use conditions.

• Excessive door opening and hot food storage cause the compressor to operate continuously and increase the electric consumption and bills.

Condensation on the inside ■ Explain how to store foods wall of the refrigerator • Condensation forms when refrigerator is installed at damp area, door is compartment and the cover of frequently opened, and wet foods are not stored in the air tight container or properly vegetable drawer. wrapped. Be sure to store wet foods in the air tight container or in secure

wrapping.

When is the power connected? ■ When should the power be connected ?

• You can connect the power right after the installation. But if the refrigerator was laid flat during transportation for a long period of time, then the refrigerant and compressor oils are mixed up, and this will affect badly the performance of the refrigerator. Be sure to connect the power 2~3 hours after refrigerator is installed.

Door does not open properly. ■ Refrigerator compartment door does not open properly.

• When the door is open, warm open air comes into the compartment and is mixed up with cool air. This mixed air shall be compressed and increases the

internal pressure when door is closed. This causes the door to more closely adhere to the refrigerator in a moment. As the refrigerator guins use, this symptom will diminish.

■ When the refrigerator compartment door is opened and closed, the freezer compartment door moves up and down.

• When the refrigerator compartment door is opened or closed, fresh air comes

into the freezer compartment and moves up and down the freezer compartment door.

■ Door opens too easily.

• There is a magnet in the gasket bushing so that it is. if door is securely closes

without a gap. Also, check to see if the foods in the refrigerator or freezer compartments are holding the door open.

■ The doors do not close properly.

• If the rear side of the refrigerator is raised higher than front side, the doors shall

not be easily closed. Adjust the level of refrigerator with the levelling screws.

The front side should

be raised a little bit higher

than the rear side.

Page 92

1. DOOR

1) Remove lower cover and then disconnect water supply tube in the lower part of freezer door.

• Pull the water supply tube  forward while pressing 

part to disconnect water supply tube as shown below.

2) Remove a freezer door.

(1) Loosen hinge cover screw of freezer door and remove

cover. Disconnect all connecting lines except grounding cord.

(2) Turn hinge lever in arrow A direction until it is

loosened and take it out in arrow B direction.

Note : • When disconnecting refrigerator door, turn hinge

lever counterclockwise.

• If hinge lever or bracket hinge pin is deformed during assembling freezer and refrigerator doors, attach two screws (Tap Tite Screw, M6: Lower fixing screw) in the hole of upper hinge.

(3) Disconnect upper hinge  from a hinge supporter 

by grasping the front part of upper hinge and lifting up (Hinge Assembly, U) in arrow direction A and pull forward in arrow B direction. Be careful so the door does not fall down.

(4) Lift up the freezer door  in arrow direction and

disconnect the door from the lower hinge . Don’t pull a door forward.

Note : • Lift up a freezer door until a water supply tube is

fully removed.

(5) Assembly is the reverse order of disassembly

HOW TO DISASSEMBLE AND ASSEMBLE

- 92 -

Hinge Cover

Connecting

Line

Grounding

Cord

Hinge Lever

Page 93

2. HANDLE

1) ,  Disconnect Cap by using Hexagon Wrench Dirver.

2) Disconnect Handle.

3) Disconnect Holder by using Hexagon wrench Driver.

3. DEODORIZER

1) Loosen the screw in .

2) Pull out a deodorant cover forward (Fig. 1) while turning a cover in arrow direction.

3) Take out a deodorizer carefully after opening hook in arrow direction(Fig. 2).

4) Assembly is the reverse order of disassembly.

Note : • Be sure to attach the aluminum plate of defrost

heater to the floor of intake before assembling.

4. SHROUD, GRILLE FAN

1) Loosen two screws after disconnecting a cap screw of a grille fan(U) with a blade screwdriver.

2) Disassembly of a grille fan(U) : Pull forward after opening hook at ➝ part with a blade screwdriver.

3) Disconnect housing A of a grille fan (L) from the main body.

4) Disassembly of a grille fan (L) : Hold upper part of a grille fan(L) and pull forward carefully.

5) Loosen two screws.

6) Disassembly of shroud. F(U) : Disconnect housing of B after removing two rail guides with a balde screwdriver.

7) Disassembly of shroud. F(U) : Hold upper part and pull forward.

8) Check foam PU sticking conditions around the shroud, F(U) and F(L) during assembling. If damaged, torn or poorly attached, assemble with a new one after sealing well.

HOW TO DISASSEMBLE AND ASSEMBLE

- 93 -

Holder

Handre

Cap

Hexagon Wrench

Driver

Hook

Deodorizer

<Fig. 1> <Fig. 2>

Shroud ,F(U)

Grille Fan(U)

Grille Fan(L)

Shroud ,F(L)

Cap,Screw

Page 94

5. CONTROL BOX, R

1) Disconnection of Cover Lamp, R(U) : Loosen one screw in the center with a phillips screwdriver after pushing two rail guides on the lower part of a control box, R with a blade screwdriver, and pull the cover lamp, R(U) forward.

2) Loosen four screws in A after taking out the lamp. Hold a lower part of control box and take out a control box by pulling forward and disconnect housing B from the main body.

6. CASE PWB

1) Loosen ten screws in  and remove cover PWB by pulling up in arrow direction.

2) When disassembling the whole case PWB, disassemble all housings first and push the case PWB in arrow direction to disassemble from the main body.

3) When disassembling Main PWB Assembly. and Sub. PWB Assembly from a case PWB, open each hook and disconnect.

HOW TO DISASSEMBLE AND ASSEMBLE

- 94 -

Cover Lamp,R(U)

Page 95

7. ICEMAKER ASSEMBLY

7-1. Dispenser Model

1) How to disassemble: (1) Remove ice bank from the freezer compartment. (2) Loosen two screws on the upper part of Icemaker

bracket.

(3) Disconnect Icemaker bracket so that it can slide

forward. (4) Disconnect Icemaker housing and sensor housing. (5) Disconnect Icemaker horizontally by pressing

bracket hook part. ( Don’t disassemble further. The

set value may be changed.)

2) How to assemble : The assembly is the reverse order of the above disassembly.

Note : When the ice tray is not horizontal after assembly,

assembly was performed in correctly. Check and assemble again.

7-2. Basic Model

1) How to disassemble: (1) Remove ice tray assembly from the freezer

compartment.

(2) Pull out knob from the ice tray in arrow direction.

(At this time, pull out a knob in arrow direction while shaking right and left as the knob is connected to pins in A .)

(3) Spring can be removed by pulling ice tray in arrow

direction and pulling out a spring inserted in ice tray axis from the hole of supporter ice tray.

2) How to assemble : Assembly is the reverse order of

disassembly.

Note : It is important to put one end of spring into the hole

of the supporter ice tray and the other end on the lower part of an ice tray when inserting spring into the shaft.

HOW TO DISASSEMBLE AND ASSEMBLE

- 95 -

Bracket, Icemaker

Hook

Icemaker Unit

Lever

Ice Tray

Sensor

Insulation

Sensor Cover

Supporter Ice Tray

Knob

Ice Tray

Spring

Page 96

8. DISPENSER

1) Disconnect button assembly by pulling down until it stops and then pull it forward.

2) Remove display frame Assembly by making a gap between a display frame Assembly. and funnel Assembly. with a blade screwdriver and pulling it forward. The cover dispenser is fixed with a hook.

3) Display Assembly can be disconnected by pressing the upper part of a cover dispenser and pushing a display Assembly. after disconnecting display frame Assembly. housing.

4) Loosen four screws with a phillips screwdriver and pull the funnel Assembly to disconnect.

5) Duct cap Assembly is disconnected if hold lever connecting screw is loosened with a phillips screwdriver.

6) For assembling a duct cap Assembly, insert one end of a spring into the right hole of dispenser lever, and insert the other end into the right hole in upper part of dispenser. And then assemble a holder lever after fixing the holder at the solenoid Assembly working part.

HOW TO DISASSEMBLE AND ASSEMBLE

- 96 -

Button

Funnel Assembly

Holder

Lever

Solenoid Assembly

Cap Assembly

Duct

Spring

Sheet Heater

Dispenser Lever

Solenoid Assembly

Page 97

9. WATER TANK AND WATER LINE

u The water tank at back and lower part of a refrigerator is

attached by one screw and has a capacity containing of 7 glasses (180cc per glass) of cold water. It will take time to make more cold water in the tank.

The first portion of dispensed water is not cold even though the refrigerator is working. In this case, dispense ice first in the cup and then water to make a water cold.

9-1. How to disassemble the water supply pipe 

1) Disconnect five fixtures mounted on the rear wall of the refrigerator after disconnecting the water supply pipe  from a water valve.

2) Remove the tie-wrap and two screws connected to the bushing inject.

3) Replace the water supply pipe  after disconnecting the water supply pipe  from a rubber inject. And assemble the parts by performing disassembly in reverse order.

9-2. How to disassemble the water tank and the

water supply pipe

1) Disconnect the water supply pipe  from a water valve on the back and lower part of the freezer.

2) Disconnect the connector Assembly. in water supply pipe at lower part of the freezer door.

3) Pull out the water supply pipe  from the thermal insulation materials after removing one screw and six tie-wraps in the lower part of a refrigerator compartment.

4) Replace a water tank or a water supply pipe  and assemble the parts by performing disassembly in reverse order.

Note : • The water supply pipe  cannot be disassembled.

• Tightly fasten six tie-wraps to prevent leakage.

HOW TO DISASSEMBLE AND ASSEMBLE

- 97 -

Bushing inject

Water Valve

Connect

Assembly

Water supply pipe

Water Tank

Nut Tube

Page 98

- 98 -

DIGITAL SECTION LAYOUT

TOUCH INPUT

TFT LCD

REMOTE CONTROLLER

SIGNAL CONTROL

REF ERROR SINGAL CONTROL

SOUND AMPLIFIER

OUTPUT:5W+5W(PEAK)

PROGRAM

PROTECTION

RECORDING

PHOTO

REMOTE CONTROLLER

SIGNAL

INPUT

TV TUNER

TV SIGNAL RECEIVE

SUB Controller

AC/DC CONVERTER

MAIN CONTROLLER

POWER SUPPLY

HDD POWER SUPPLY

REF ERROR SIGNAL

PROGRAM SAVE

T/S,Inv Out

T/Screen

Controller

Touch Screen

TMDS CABLE

Microphone

CCD Camera

REMOTE CONTROLLER

RECEIVER

Remocon CON'T

REF ERROR CON'T

MICOM

Amplifier

Inverter

BACKLIGHT

RS-232

(EXTENSION PORT)

USB

EXTENSION PORT

ANTENNA

Digital Part

ON/OFF S/W

LAN LINE

RESET

BUTTON

Monitor ASSEMBL Y

USER

(Input/Output)

SPEAKER

MANAGEMENT

BUTTON

COM2

RJ-45

LAN

USB1

USB2

AV IN2

COM1

ATX

POWER IN

AV IN1

Parallel PORT

Audio Out

IDE PORT

LCD Out

Main Controller

(Geode GX 300)

S.M.P.S

(Free Voltage

INPUT VOLTAGE

:AC90~288V)

PWB,SUB

REF MICOM

AC INPUT

HARDDISK

Page 99

DIGITAL SECTION LAYOUT

- 99 -

Page 100

- 100 -

LG LRSPC2661xx Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual