LG Service Manual LRSC26922xx_S_M

CAUTIONPLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR.

REFRIGERATORSERVICE MANUAL

LRSC26944SW, LRSC26944TTLRSC26930SW, LRSC26930TTLRSC26922SW, LRSC26922TTLRSC26920SW, LRSC26920TT

LRSC26911SW, LRSC26911TTLRSC26910SW, LRSC26910TT

LRSC26980TT

http://biz.lgservice.com

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

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

PARTS IDENTIFICATION ....................................................................................................................................................... 9

HOW TO INSTALL THE REFRIGERATOR .......................................................................................................................... 14

HOW TO ADJUST DOOR HEIGHT.................................................................................................................................... 14

FILTER ............................................................................................................................................................................... 15

HOW TO CONTROL THE ICEMAKER WATER SUPPLY.................................................................................................. 16

MICOM FUNCTION .............................................................................................................................................................. 18

EXPLANATION OF MICOM CIRCUIT .................................................................................................................................. 32

EXPLANATION OF PWB CIRCUIT.....................................................................................................................................32

PWB PARTS DIAGRAM AND LIST.....................................................................................................................................47

PWB CIRCUIT DIAGRAM ...................................................................................................................................................54

OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER ................................................................................... 56

OPERATION PRINCIPLE................................................................................................................................................... 56

CONTROL METHOD ACCORDING TO FUNCTIONS....................................................................................................... 57

DEFECT DIAGNOSIS FUNCTION..................................................................................................................................... 59

CIRCUIT................................................................................................................................................................................ 60

TROUBLE DIAGNOSIS........................................................................................................................................................ 63

TROUBLESHOOTING ....................................................................................................................................................... 63

FAULTS .............................................................................................................................................................................. 73

COOLING CYCLE HEAVY REPAIR................................................................................................................................... 90

HOW TO DEAL WITH CLAIMS.......................................................................................................................................... 97

HOW TO DISASSEMBLE AND ASSEMBLE..................................................................................................................... 103

DOOR............................................................................................................................................................................... 103

HANDLE ........................................................................................................................................................................... 104

FAN SHROUD GRILLE .................................................................................................................................................... 105

ICEMAKER ASSEMBLY................................................................................................................................................... 105

DISPENSER..................................................................................................................................................................... 106

TV-RADIO ............................................................................................................................................................................107

EXPLODED VIEW............................................................................................................................................................... 113

REPLACEMENT PARTS LIST ........................................................................................................................................... 131

CONTENTS

- 2 -

Please observe the following safety precautions to use therefrigerator safely and correctly and to prevent accident orinjury when servicing.

1. Be careful of an electric shock. Disconnect power cordfrom wall outlet and wait for more than three minutesbefore replacing PWB parts. Disconnect the powerwhenever replacing and repairing electric components.

2. If disconnecting the power, wait at least 5 minutesbefore plugging the unit back in.

3. Before touching the power cord, make sure the cord isnot damaged. If the power cord is damaged, it cancause a fire or an electrical shock.

4. Make sure the unit has a dedicated circuit breaker.Overloading the circuit 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.

7. Remove dust and foreign materials from the housingand connecting parts.

8. Do not fray, damage, run over, kink, bend, pull out, ortwist the power cord.

9. Please check for evidence of moisture intrusion in theelectrical components. Replace the parts or mask withinsulation tape if moisture intrusion is confirmed.

10. Stay clear of the icemaker with hands or tools if the unithas power. Do not try to manually turn the ice makereven when turned off.

11. Customers should not repair the refrigeratorthemselves. This work requires special tools andknowledge. Non-professionals could cause fire, injury,or damage to the product.

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

13. Do not put anything on top of the refrigerator,especially something containing water, like a vase.

14. Do not put glass bottles of water into the freezer. Thecontents will freeze and break the bottles.

15. If you scrap or discard the refrigerator, remove thedoors and dispose of it where children are not likely toplay in or around it.

WARNINGS AND PRECAUTIONS FOR SAFETY

- 3 -

SPECIFICATIONS

- 4 -

ITEMS SPECIFICATIONS

DIMENSIONS 908 X 896 X 1771 mm

W X D X H (3511/16X355/16X6911/16 in.)

NET WEIGHT 149 kg (328.5 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 (185g) (61/2 oz.)

LUBRICATING OIL FREOL @10G (320 cc)


DRIER MOLECULAR SIEVE XH-7

CAPILLARY TUBE ID Ø0.83

FIRST DEFROST 4 - 5 Hours

DEFROST CYCLE 13 - 15 Hours

DEFROSTING DEVICE Heater, Sheath

ANTI-SWEAT HEATER Dispenser Duct Door Heater

Dispenser Heater

ANTI-FREEZING HEATER Water Tank Heater

Damper Heater

FREEZER LAMP 40W (2 EA)

REFRIGERATOR LAMP 40W (4 EA)

DISPENSER LAMP 15W (1 EA)

724

mm

(28

1 /2

in.)

1004 mm (391/2 in.)

908 mm (353/4 in.)

779

mm

(30

5 /8

in.)

829

mm

(32

5 /8

in.)

897

mm

(35

5 /16

in.)

1261

mm

(49

5 /8

in.)

1741

.5 m

m (

681 /

2 in

.)

1746

.5 m

m (

683 /

4 in

.)

1771

mm

(69

11/ 1

6 in

.)

1771

mm

(69

11/ 1

6 in

.)

Front View Top View

Ref No. : LRSC26944**

SPECIFICATIONS

- 5 -

724

mm

(28

1 /2

in.)

1004 mm (391/2 in.)

908 mm (353/4 in.)

779

mm

(30

5 /8

in.)

829

mm

(32

5 /8

in.)

897

mm

(35

5 /16

in.)

1261

mm

(49

5 /8

in.)

1741

.5 m

m (

681 /

2 in

.)

1746

.5 m

m (

683 /

4 in

.)

1771

mm

(69

11/ 1

6 in

.)

1771

mm

(69

11/ 1

6 in

.)




W X D X H (3511/16X355/16X6911/16 in.)





Heater Defrost














Dispenser Heater


Damper Heater




Front View Top View

SPECIFICATIONS

- 6 -



W X D X H (3511/16X355/16X6911/16 in.)





Heater Defrost














Dispenser Heater


Damper Heater




724

mm

(28

1 /2

in.)

1004 mm (391/2 in.)

908 mm (353/4 in.)

779

mm

(30

5 /8

in.)

829

mm

(32

5 /8

in.)

897

mm

(35

5 /16

in.)

1261

mm

(49

5 /8

in.)

1741

.5 m

m (

681 /

2 in

.)

1746

.5 m

m (

683 /

4 in

.)

1771

mm

(69

11/ 1

6 in

.)

1771

mm

(69

11/ 1

6 in

.)

Ref No. : LRSC26920**, LRSC26922**

Front View Top View

SPECIFICATIONS

- 7 -



W X D X H (3511/16X355/16X6911/16 in.)





Heater Defrost














Dispenser Heater


Damper Heater




724

mm

(28

1 /2

in.)

1004 mm (391/2 in.)

908 mm (353/4 in.)

779

mm

(30

5 /8

in.)

829

mm

(32

5 /8

in.)

892

mm

(35

1 /8

in.)

1261

mm

(49

5 /8

in.)

1741

.5 m

m (

681 /

2 in

.)

1746

.5 m

m (

683 /

4 in

.)

1771

mm

(69

11/ 1

6 in

.)

1771

mm

(69

11/ 1

6 in

.)

Front View Top View

Ref No. : LRSC26910**, LRSC26911**

SPECIFICATIONS

- 8 -



W X D X H (3511/16X355/16X6911/16 in.)





Heater Defrost














Dispenser Heater


Damper Heater




724

mm

(28

1 /2

in.)

1004 mm (391/2 in.)

908 mm (353/4 in.)

779

mm

(30

5 /8

in.)

829

mm

(32

5 /8

in.)

897

mm

(35

5 /16

in.)

1261

mm

(49

5 /8

in.)

1741

.5 m

m (

681 /

2 in

.)

1746

.5 m

m (

683 /

4 in

.)

1771

mm

(69

11/ 1

6 in

.)

1771

mm

(69

11/ 1

6 in

.)

Front View Top View

Ref No. : LRSC26980TT

PARTS IDENTIFICATION

- 9 -

Humidity SwitchOptiChill Display

Lamp

Shelf

Egg Box

Snack Drawer

Vegetable Drawer

OptiChill

Door Rack

Shelf

Grab and Go

Can Server

Lamp

Lower Cover

Dairy Products Corner

Water Filter

Door Rack

Drawer(Wire/Plastic)

Freezer Compartment

Refrigerator Compartment

AutomaticIcemaker

Door Rack

Shelf

Door Rack

Bottle Guide

Display Panel

Dispenser Lamp

Ice & WaterDispenser Button

PCB Cover

Water Tubes




- 10 -

Humidity Switch

Lamp

Shelf

Egg Box

Snack Drawer

Vegetable Drawer

OptiChill

Door Rack

Shelf

Grab and Go

Wine Holder

Lamp

Lower Cover


Door Rack


Freezer Compartment


AutomaticIcemaker

Door Rack

Shelf

Bottle Guide

Display Panel

Dispenser Lamp


OptiChill Display

Door Rack

Water Filter

PCB Cover

Water Tubes


- 11 -

Humidity Switch

Lamp

Shelf

Egg Box

Snack Drawer

Vegetable Drawer

Vegetable Drawer/Meat Drawer

Door Rack

Shelf

Door Rack

Wine Holder

Lamp

Lower Cover


Door Rack


Freezer Compartment


AutomaticIcemaker

Door Rack

Shelf

Bottle Guide

Display Panel

Dispenser Lamp


PCB Cover

Water Tubes

Door Rack

Water Filter

Ref No. : LRSC26920**, LRSC26922**

Ref No. : LRSC26910**, LRSC26911**


- 12 -

Lamp

Shelf

Egg Box

Snack Drawer

Vegetable Drawer

Vegetable Drawer/Meat Drawer

Door Rack

Shelf

Door Rack

Wine Holder

Lamp

Lower Cover


Door Rack


Freezer Compartment


AutomaticIcemaker

Door Rack

Shelf

PCB Cover

Water Tubes

Door Rack

Water Filter

Humidity Switch

Bottle Guide

Display Panel

Dispenser Lamp



- 13 -

Humidity SwitchOptiChill Display

Lamp

Shelf

Egg Box

Snack Drawer

Vegetable Drawer

OptiChill

Door Rack

Shelf

Grab and Go

Can Server

Lamp

Lower Cover


Water Filter

Door Rack


Freezer Compartment


AutomaticIcemaker

Door Rack

Shelf

Door Rack Bottle Guide

Display Panel

Dispenser Lamp


PCB Cover

Water Tubes

Ref No. : LRSC26980TT

How to Adjust Door Height of Refrigerator Level the refrigerator first. (If the refrigerator is not installed on a flat floor, the height of freezer and refrigerator doors

may not be the same.)

If the freezer door is lower than the refrigerator door: If the freezer door is higher than the refrigerator door:

Insert a driver into the groove of the adjustingscrew and turn in the direction of the arrow (clockwise)until the refrigerator is level.

Insert a driver into the groove of the adjustingscrew and turn in the direction of the arrow (clockwise)until the refrigerator is level.

HOW TO INSTALL REFRIGERATOR

- 14 -

AdjustingScrew

Driver

HeightDifference

HeightDifference

HeightDifference

HeightDifference

1

2

FilterReplace the filter when the indicator light comes on or theperformance of the icemaker or water dispenser decreasesnoticeably.

After changing the water filter cartridge, reset the waterfilter status display and indicator light by pressing andholding the BUTTON for 3 seconds.(page 18)

1. Remove the old cartridge.Twist the knob of the cartridge counter clockwise.

When the cartridge is removed, you will feel it click .

Pull out the cartridge.

NOTE: There will be some water(25cc) in the filtercartridge. Some spilling may occur. Catch it in abowl or towel.

2. Replace with a new cartridge.Take the new cartridge out of its packaging and remove theprotective cover from the o-rings.

With the cartridge knob in the vertical position, push thenew filter cartridge into the cover until it stops.

If you can’t turn the filter from side to side, it isn’t fullyinserted. Push it in firmly and twist it into place. You willhear the snap when it clicks into place.

Using the handle, twist the cartridge clockwise about 1/4turn.

3. After replacing filter, dispense water through the waterdispenser for 3 minutes to purge the system.There may be a little air in the line, causing noise orhissing. Run the water at the dispenser until the hissingstops.

NOTE: - To purchase replacement water filter cartridges,visit your local appliance dealer or part distributor,or call 1-877-714-7486.

- You can also visit our website :www.lgappliances.com


- 15 -

Ice Maker

1) How to Control the Amount of Water Supplied to Icemaker.Caution : • Do not put hands or tools into the chute to confirm the operation of geared motor.

It may damage the refrigerator or hurt your hands.

To gain access to the ice maker, remove the ice bin in the upper part of the freezer compartment. Then use the watercontrol switch to change the amount of water supplied to the ice maker.

Water supply amount TABLE


- 16 -

21

STAGE TIME TO SUPPLY INDICATIONS REMARKS

1

2

3

4

5

4 sec.

4.5 sec.

5 sec.

5.5 sec.

6 sec.

The water amount will vary depending

on the Water Control Switch setting as

well as the water pressure of the

connected water line.

ww WARNING Personal Injury Hazard Avoid contact with the moving parts of the ejectormechanism or with the heating element that releasesthe cubes. DO NOT place fingers or hands on theautomatic icemaking mechanism while the refrigeratoris plugged in.

2) Operating instructionsA newly-installed refrigerator may take up to 24 hoursto begin making ice.

The icemaker will produce eight cubes percycle—approximately 120–150 cubes in a 24-hour period,depending on freezer compartment temperature, roomtemperature, number of door openings and other operatingconditions.

If the refrigerator is used before the water connection ismade to the icemaker, set the power switch to O (off).

When the refrigerator has been connected to the watersupply, set the power switch to I (on).

The icemaker will fill with water when it cools to freezing. Anewly-installed refrigerator may take up to 24 hours tobegin making ice cubes.

Throw away the first few batches of ice to allow the waterline to clear.

Be sure nothing interferes with the sweep of the feeler arm.

When the bin fills to the level of the feeler arm, theicemaker will stop producing ice.

It is normal for several cubes to be stuck together.

If ice is not used frequently, old ice cubes will becomecloudy, taste stale, and shrink.

NOTE: If the cube size is smaller or larger than youexpected, you can regulate the size with the cube sizebutton. (normally caused by variations in water pressure.)

Every time you press the cube size button, the indicatorlight goes up. The higher the position indicated, the largerthe cubes will be. (1st step is the next after the 5th step.)

3) When you should set the icemaker powerswitch to O (off)

• When the water supply will be shut off for several hours.

• When the ice storage bin is removed for more than aminute or two.

• When the refrigerator will not be used for several days.

4) Normal sounds you may hear• The icemaker water valve will buzz as the icemaker fills

with water. If the power switch is in the I (on) position, itwill buzz even if it has not yet been hooked up to water.To stop the buzzing, move the power switch to O (off).

NOTE: Keeping the power switch in the I (on) positionbefore the water line is connected can damage theicemaker.

• You will hear the sound of cubes dropping into the binand water running in the pipes as the icemaker refills.

5) Preparing for VacationSet the icemaker power switch to O (off) and shut off thewater supply to the refrigerator.

If the ambient temperature will drop below freezing, have aqualified servicer drain the water supply system (on somemodels) to prevent serious property damage due toflooding from ruptured water lines or connections.


- 17 -

Feeler Arm

Icemaker

Cube SizeIndicator Light Water Supply

Control Switch

Power Switch

1. Monitor Panel

1-1. LRSC26944**, LRSC26980TT

1-2. LRSC26930**

1-3. LRSC26910**, LRSC26911**, LRSC26920**, LRSC26922**

MICOM FUNCTION

- 18 -

ICEBEAMCOOLING

OFF

CUBE FILTERMONTH

EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOOK

ROOM TEMP

DISPENSER & KEY

F

WATER 54321

CRUSH

F F

3 SECS

Dispenser selection button

Express Freezer/Jet Freezer function selection button

Dispenser and Button Lock button

Filter Timer Reset & Dispenser Light Toggle

Refrigerator Compartment Temperature Setting

Freezer Compartment Temperature Setting

EXPRESS DIGITAL CONTROL

FRZ TEMP REF TEMPJET

CUBE

FILTER RESETHOLD 3SECS

EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER RESET/LIGHT LOOK

ROOM TEMP

LOCK

DISPENSER & KEY

WATER

CRUSH3 SECS

FC

FC

FC

FILTER

ON DIGITAL CONTROL

FRZ TEMP REF TEMPOFF

CUBE


EXPRESS FRZ DISPENSER FREEZER REFRIGERATOR FILTER RESET/LIGHT LOOK

ROOM TEMP

LOCK

DISPENSER & KEY

WATER

CRUSH3 SECS

FC

FC

FC

FILTER

2. Refrigerator Functions2-1-1. Temperature Selection (LRSC26944**, LRSC26980TT)

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

Whenever pressing the button, setting is repeated in the order of (Medium) (Medium Cold) (Coldest) (Warmest) (Medium Warm).

• The actual inner temperature varies depending on the food status, as the indicated setting temperature is a targettemperature, not the actual temperature within the refrigerator.

• A newly installed refrigerator will take 24 hours minimum for temperatures to stabilize. The temperature should bechecked and adjusted as necessary after 2 or 3 days.

2-1-2. LCD Back Light Control (LRSC26944**, LRSC26980TT)

1. In order to see the LCD display more easily, the backlight is turned on for one minute at the initial application of power, for20 seconds when buttons are pressed, when a door is opened, and for 20 seconds after the door is closed.

2. When any display button is pressed while the backlight is off, the bell sounds and the backlight is turned on, but thebutton function is not performed. In other words, pressing any button turns on the backlight but does not cause anyfunction to be initiated.

3. To check the LCD graphic and back light ON/OFF status, press and hold the EXPRESS/JET FRZ and FREEZER buttons.This will turn the back light on and illuminate all of the graphics. When the buttons are released, the graphic displayreturns to its previous setting and the back light is turned off.

2-1-3. Room temperature display function

1. The sensor for the ROOM TEMP display is located under the upper right hinge cover. Factors such as air flow, lighting,and other appliances operating within the room, may cause the display to differ from other temperature displays in thesame room.

2. Ambient temperature is displayed between 16°F and 120°F. Temperatures 15°F and below are displayed as Lo andtemperatures 121°F and above are displayed as Hi. If the ambient temperature sensor fails, Er will be displayed.

MICOM FUNCTION

- 19 -

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

Setting temperature

Temperature Control

Medium Medium Cold Coldest Warmest Medium Warm

Freezer Control -2 °F -5 °F -8 °F 7 °F 4 °F

Refrigeration 37 °F 34 °F 32 °F 46 °F 41 °F

Control

54321

54321

54321

54321

54321

2-1-4. Lock function (dispenser and display button lock)

1. When the refrigerator is first powered up, the Lock function is turned off.

2. To lock the display, the dispenser, and the control panel, press and hold the LOCK button for more than 3 seconds. TheLOCK text on the display will be turned on.

3. To unlock the controls, press and hold the lock button for more than 3 seconds. The LOCK text on the display will beturned off.

2-1-5. Filter condition display function

LCD (LRSC26944**, LRSC26980TT)

1. This units displays the months left before the water filter needs to be changed. It starts when the unit is first plugged in.

2. After 6 months have passed the filter change will appear on the display. It will show FILTER LIGHT 3 SECS.

3. Press and hold the filter button for 3 seconds to reset the filter timer.

LED (All models except LRSC26944**, LRSC26980TT)

1. There is a replacement indicator light for the water filter cartridge on the dispenser.

2. The water filter should be replaced every six months or about 28,000 seconds' filtering time.

3. The water filter light and FILTER RESET HOLD 3 SECS will show in the display to remind you to change the filter soon.

4. After replacing the filter, press and hold the lock button for more than 3 seconds. The FILTER RESET HOLD 3 SECS willturn off.

MICOM FUNCTION

- 20 -

DISPENSER & KEY

3 SECSLOCK

DISPENSER & KEY

3 SECS

LOCK CONTROL

DISPENSER & KEY

3 SECSLOCK

DISPENSER & KEY

3 SECS

LOCK CONTROL

Ex) SelectLOCK

Ex) SelectLOCK again

Ex) SelectLOCK

Ex) SelectLOCK again

In initialPower OnClassification

Filter StatusDisplay

Pass ofa month

Pass of2 months

Pass of3 months

Pass of4 months

Pass of5 months

Pass of6 months

3 SECS

FILTERMONTH

FILTERMONTH

FILTERMONTH

FILTERMONTH

FILTERMONTH

FILTERMONTH

FILTERMONTH

FILTER LIGHT

In initial Power On / Filter RESET

Replace indicator light onClassification

Filter StatusDisplay

FILTER


FILTER

LCD (LRSC26944**, LRSC26980TT) LED (All models except LRSC26944**, LRSC26980TT)

3 SECSFILTER LIGHT

2-2. Dispenser use selectionYou can select water or ice.

Select water, crushed ice, or ice cubes by cycling through the selections whenpressing the DISPENSER button.

Hold your cup in the dispenser for a few seconds after dispensing ice or water toallow the last pieces of ice or drops of water to fall into the cup.

2-3. Express freezing/JET freezing selectionPlease select this function for prompt freezing.

• The functions are cycled in the order shown below when the EXPRESS/JET FRZ button is pressed.

• The arrow mark graphic remains at the On status after flickering 4 times when selecting Special Refrigeration EXPRESSFRZ or JET FRZ.

• EXPRESS FREEZE and JET FREEZE operate for a set time and then default to normal freezer operation.

2-4. Dispenser Light• Dispenser switch or dispenser light button turns the dispenser light in the dispenser on and off.

• The dispenser light turns off automatically after 7 minutes.

MICOM FUNCTION

- 21 -

DISPENSER

LCD LED

CUBE

WATER

CRUSH

CUBE

WATER

CRUSH

PressingSwitch

LCD (LRSC26944**, LRSC26980TT)

LED (LRSC26930**)

LED (LRSC26910**, LRSC26911**, LRSC26920**, LRSC26922**)

EXPRESS/JET FRZ

OFF

EXPRESS FRZ

JET FRZ

EXPRESS/JET FRZ EXPRESS

JET

EXPRESS FRZ ON

OFF

Dispenser Iight OFFLCD

Dispenser Iight ONLCD

Dispenser Iight ON/OFFLED

CN

2-5. Express freezing1. EXPRESS FREEZING improves the cooling speed of the freezer by running the compressor and the freezer fan.

2. In the event of power failure, EXPRESS FREEZING is cancelled and the freezer defaults to normal operation.

3. The temperature setting is not changed when EXPRESS FREEZING is selected.

4. The freezer compartment and refrigerator temperature settings can be changed even when EXPRESS FREEZING isselected and the cycle is underway.

5. The refrigerator compartment will operate at its usual setting even when EXPRESS FREEZING is selected or in progress.

6. If you select EXPRESS FREEZING, the refrigerator will default to its original setting at the end of the cycle.

7. If the defrost cycle is scheduled to come on while EXPRESS FREEZING is selected, EXPRESS FREEZING will operateonly for the time that is not used by the defrost setting.

8. If you press EXPRESS FREEZING during the defrost cycle, the EXPRESS FREEZING indicator will turn on but the cyclewill not run until the defrost cycle is completed.

9. If you press EXPRESS FREEZING within 7 minutes of the compressor’s last run cycle, the EXPRESS FREEZING cyclewill not begin until the 7 minute delay is complete.

10. The freezer fan runs at high speed when Express Freezing is selected.

2-6. Jet Freezing1. Jet Freezing improves the cooling speed of the Jet Freezing Compartment by running the compressor and the Jet

Freezing Compartment fan.

2. If there is a power failure, the Jet Freezing cycle is released and the freezer defaults to its original setting.

3. If Jet Freezing is selected, the compressor (after the compressor delay time has passed) and the freezer fan will beturned on. The temperature in the freezer will drop and the fan motor will be turned off for a set time, but the Jet Freezingfan will run for no more than two hours. After that, the Jet Freezing function is terminated and the freezer defaults to itsoriginal setting.

4. To keep the fan motor from freezing, it is switched on for 10 seconds once an hour.

5. The fan motor of jet freezing box will not be detected as a failure. (dc 12v operation)

6. When checking the Jet Freezing function, the Jet Freezing Compartment fan motor is switched on for 1 minute if thefreezer adjustment button or the Express Freeze button is pressed for more than one second.

MICOM FUNCTION

- 22 -

2-7. OptiChill Function

uu LRSC26944**, LRSC26980TT 2-7-1. OptiChill Temperature Control

1. The Optichill is positioned at the bottom of the refrigerator compartment. It allows the user to select a more specifictemperature based on the foods being stored, such as meat, fish, fruits and vegetables, etc.

2. The Optichill system consists of a sensor at the rear of the drawer, a damper, a fan motor between the Optichillcompartment and the freezer, a heater at the bottom of the Optichill compartment, and a temperature adjustment displayat the top.

3. The initial setting of the Optichill will be FRUIT VEGE.

4. Each time you press the SELECT button, the selection cycles through the settings in the order of FRUIT VEGE(39°F)CHILLED ROOM (30°F)PARTIAL FREEZING (27°F)WINE(50°F)FRUIT VEGE (39°F). The display will showthe target temperature. If EXPRESS CHILL or THAW is selected, the selected temperature and NOTCH LED are notshown, and the temperature can be adjusted.

5. The Optichill sensor detects the temperature and relays this information to the MICOM. Based on the temperature andsetting, The damper is opened or closed and the heater is on or off, as the conditions warrant.

6. If the Optichill damper hasn’t moved within an hour, it is automatically opened or closed and then returned to its previoussetting to keep it from freezing in one position.

7. In Display Check mode, the Optichill fan motor is turned on for one minute. To enter the Display Check mode, press andhold both the Freezer Adjust button and the Express Freezing button for three seconds.

8. If the Optichill fan motor hasn’t run within an hour, it is automatically run for ten seconds once every hour to keep it fromfreezing in one position.

MICOM FUNCTION

- 23 -

°F / SET TEMP

/ TIME REMAININGMINWINE3.0 1.5 0.5

EXPRESSCHILL

THAW(lbs)

FRUITVEGE

CHILEDROOM

PARTIALFREEZING

SELECT SELECT

HR

Display 27°F 30°F 39°F 50°F

NOTCHPartial

FreezingChilledRoom

FruitVEGE

Wine

12Hr 8Hr 4Hr 90Min 50°F

3.0lbs 1.5lbs

THAW

0.5lbs

ExpressChill

Function

2-7-2. OptiChill Thawing & Express Chill Control

1. When you press the SELECT button on the right, the THAW LED will light. The time for the selected function will beshown. You can cycle through the options in this order: EXPRESS CHILL/THAW OFFEXPRESS CHILL (90 Min.)THAW 0.5 lbs. (4 hours)THAW 1.5 lbs. (8 hours)THAW 3.5 lbs. (12 hours)EXPRESS CHILL/THAW OFF. If EXPRESS CHILL/THAW is selected, the NOTCH temperature in the Optichill will not be displayed.

2. If EXPRESS Chill is selected, the Optichill damper is opened and the fan motor is turned on. If the Optichill does notreach the set temperature after no more than ninety minutes, the setting is released.

3. The Optichill will count down from 90 minutes and show the remaining time in minutes.

4. When the EXPRESS CHILL cycle ends (or is released), the setting defaults to FRUIT VEGE (39°F).

5. If THAW is selected, the Optichill damper is closed and the time and temperature will be set according to the thawingfunction selected. The thawing function will be automatically terminated at the end of the set time.

6. When in THAW mode, the sensor controls the heater to keep the set temperature.

7. When in THAW mode, the display counts down the remaining time in minutes.

8. When the THAW mode is released, the Optichill automatically defaults to CHILLED ROOM (30°F).

uu LRSC26930**2-7-3. OptiChill Temperature Control

1. The Optichill is in the bottom of the refrigerator compartment and allows the user to select and adjust the temperaturebased on the type food stored there. Selections include meat, fish, fruits and vegetables, etc. Storing foods at the propertemperature allows them to be stored for longer periods.

2. The Optichill consists of a temperature sensor, a damper between the Optichill and the freezer, and a temperaturecontrol/display at the top.

3. At initial power-up, the Optichill defaults to FRUIT VEGE. If the refrigerator door is opened, the Optichill LED will be on.

4. When you press the SELECT button on the left, the LED will light and indicate the setting. The time for the selectedfunction will be shown. You can cycle through the options in this order: FRUIT VEGE (39°F)CHILLED ROOMPARTIALFREEZINGFRUIT VEGE. The display will indicate the temperature for the selected setting.

5. The Optichill sensor detects the temperature and relays that information to the MICOM. When the set temperature isreached, the Optichill damper is closed. If the temperature rises, the damper is opened to allow the temperature to fallagain.

6. If the Optichill damper hasn’t moved within an hour, it is automatically moved and returned to its original setting onceevery hour to keep it from freezing in one position.

MICOM FUNCTION

- 24 -

2-8. Variable freezing fan1. To increase the cooling speed and load response speed, the MICOM will switches the freezer compartment fan motor

between high and regular speeds.

2. The MICOM runs the freezer fan at high speed only at initial power-up, Express Freezing operation, or in response to ahigh load. The fan runs at the regular speed in all other circumstances.

3. When you open the refrigerator door while the fan is running at high speed, the MICOM will switch the fan to regularspeed. If you open the freezer door or the home bar door, the fan is switched off.

4. If the MICOM determines the fan is obstructed (the blade cannot turn) it switches the fan off. When there is no fan rotationsignal for 115 seconds, the MICOM displays an error on the display. To restart the fan, clear the obstruction and turn thepower off and back on.

2-9. Cooling fan motor1. The cooling fan is switched ON and OFF in conjunction with the compressor.

2. The cooling fan runs at a single speed.

3. The Failure sensing method is the same as in the fan motor of the freezing fan motor (refer to failure diagnosis functiontable for failure display).

2-10. Door alarm1. If the doors are left open for more than one minute, the buzzer sounds three 1/2-second tones at thirty second intervals for

four times.

2. If all the doors of freezing/cold storage room or home bar are closed during door open alarm, alarm is immediately turnsoff.

2-11. Button selection buzzer bell1. The DING sounds if you press any button on the front display.

MICOM FUNCTION

- 25 -

Doors of freezing / cold storage room

or home bar

BUZZER

Closing Opening

Withina minute

A minute 30seconds

30seconds

30seconds

OpeningClosing Closing

3 Times 3 Times 3 Times 3 Times

2-12. Automatic Defrost Signal1. The beep will sound if you press the test button on the main PCB.

2. The regular cycle sounds three short beeps one second apart.

3. When you select the automatic defrost cycle, the alarm sounds three series of three short beeps one minute apart.

2-13. Defrost Function1. Automatic defrost is performed whenever the compressor run time totals 71/2 hours.

2. At initial power-up, the defrost cycle will run when the total compressor runtime is 41/2 hours.

3. Defrost is completed when the defrost sensor temperature rises above 41°F (5°C) during the defrost cycle. The defrostcycle will terminate if the defrost sensor temperature does not achieve 41°F (5°C) within two hours.

4. The defrost cycle will not operate if the defrost sensor fails.

2-14. Refrigerator compartment lamp automatically off1. The refrigerator light is turned ON and OFF by the refrigerator door switch.

2. If the refrigerator light is on for more than 7 minutes, it will be turned off automatically. It will operate normally if you closethe door and re-open it.

MICOM FUNCTION

- 26 -

2-15. Sequential operation of componentsElectromechanical parts of the appliance, such as the compressor, defrost heater, freezer fan, cooling fan, and dampermotor, are operated sequentially as shown in the chart below to prevent noise and circuit overload from everything startingat once.

MICOM FUNCTION

- 27 -

Function Load Operation Sequence Remark

Inapplying

Initialpower

TE

ST

MO

DE

When temperatureof a defrost sensorbecomes morethan 45°C (initial setup,movement)

If error occursduring operation,initial operation isnot done.

Sequence of loadoperation whenclosing freezerand refrigerator.

The refrigeratorwill return tonormal operationif you press thetest switch onceagain while inTest Mode 2 or ifthe temperatureof the defrostsensor surpasses41°F (5°C). Thecompressor willrun after the 7-minute delay.

Whentemperature of adefrost sensorbecomes lessthan 45°C (power failure,service)

Test mode 1 (Compulsoryfunction)

Test mode 2 (Compulsorydefrost)

POWER

ON

COMP

ON

F-FAN&

C-FANON

R-STEPMOTOR

DAMPERON

OPTICHILLSTEP

DAMPERMOTOR

ON

DEFROSTHEATER

OFF

DEFROSTHEATER

ON

DAMPER&

DUCT DOOR& OPTICHILLHEATER ON

DAMPER&

DUCT DOOR& OPTICHILLHEATER OFF

0.3sec.

6.0sec.

0.3sec.

0.3sec.

0.3sec.

POWER

ON

0.3sec.

PIPE&

DISP'HEATER

OFF

0.3sec. COMP

ON

0.3sec. F-FAN

&C-FAN

ON

0.3sec. R-STEP

MOTORDAMPER

ON

0.3sec.

OPTICHILLSTEP

DAMPERMOTOR

ON

PIPE&

DISP'HEATER

ON

TESTSWITCH(PRESSOnce)

OTHERLOAD

OFF

COMP

ON

F-FAN&

C-FANON

R-STEPMOTOR

DAMPERON

OPTICHILLSTEP

DAMPERMOTORCLOSE

TESTSWITCH(PRESS2 Times)

COMP

OFF

F-FAN&

C-FANOFF

FROSTREMOVALHEATER

ON

R-STEPMOTOR

DAMPERCLOSE

0.3sec.

0.3sec.

0.3sec.

0.3sec.

0.3sec.

0.3sec.

0.3sec.

0.3sec.

0.3sec.

0.3sec.

0.3sec.

2-16. Failure Diagnosis 1. The failure diagnosis function indicates the area of a failure while the product is in operation.

2. When the appliance enters the failure mode, pressing buttons has no effect on the operation of the appliance.

3. If the error clears itself, the MICOM will reset and the appliance will operate as usual.

4. The failure code will be displayed as indicated in the drawings below. All other graphics and displays will be turned off.

MICOM FUNCTION

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ICEBEAM

COOLING

OFF

CUBE FILTER

MONTH

ROOM TEMP

DISPENSER & KEY

F

WATER 5

4

3

2

1CRUSH

F F

3 SECS

EXPRESS(On)

DIGITAL CONTROL

FRZ TEMP REF TEMP(Off)JET

CUBE

FILTER RESETHOLD 3SECS ROOM TEMP

LOCK

DISPENSER & KEY

WATER

CRUSH3 SECS

F

CF

C

F

C

FILTER

C

E

A B D C

FAILURE CODE

INDICATION PART E

A B D

FAILURE CODE

INDICATION PART

LRSC26944**, LRSC26980TT All models except LRSC26944**, LRSC26980TT

All displays turn off other than freezer room notch temperature display and refrigerator room notch temperaturedisplay(failure code indication part) when indicating failure modes(except for Note1, Note2).

1

2

3

4

5

6

7

8

9

10

Er FS

Er rS

Normal display (Note 2)

Er dS

Er dH

Er FF

Er CF

Er CO

Normal display (Note 1)

Normal display(Note 2)

Failure code indication part

Freezer notchtemperature

display

Refrigerator notchtemperature

display

No. Item Contents of failure FreezingBLDC motorCompressor Stepping

motor damperDefrostHeater

CoolingBLDC motor

Product operation status in failure

Abnormalfreezer sensor

Abnormal refrigeratorsensor 1 (R1) (Upper part in therefrigeratorcompartment)

Abnormal refrigeratorsensor 2 (R2) (Middle part in therefrigeratorcompartment)

Abnormal defrostsensor

Failed defrosting

Abnormal freezingBLDC motor

Abnormal coolingBLDC motor

CommunicationErrors.

Abnormalambient sensor

Abnormal Optichill sensor

Freezer sensor short circuit

Refrigerator sensor1 short circuit

Refrigerator sensor2 short circuit

Abnormal short circuit

Defrost heater, temperature fuse shortcircuit, unplugged connector(indicated4 hour later after trouble)

Motor defect, hooked of lead wireto fan, contact of structures withfan, short or open of leadwire(there is no signal of BLDCmotor more than 115 seconds inoperation of fan motor)

Short or open of lead wireconnecting between main PCBand display PCB, transmission trand receiving part

Ambient sensor short circuit

Optichill sensor short circuit

StandardRPM

StandardRPM

StandardRPM

StandardRPM

StandardRPM

OFF

StandardRPM

StandardRPM

OFF

ON for 15minutes /OFF for 15minutes

No defrost

Full opening for10 minutes/

Full closing for15 minutes

: Proper operation

Note1) The freezer and refrigerator temperature displays are also used to display error codes. The exception is that whenthe ambient temperature sensor fails, it shows Er in the ambient temperature display. All other display elements willfunction normally.

Note2) The R2 sensor, Optichill sensor, and water tank sensor are not indicated in the error codes, but you can see theseerrors by entering the test mode by pressing and holding the Freezer Temperature and Express/Jet Freezer buttonssimultaneously.

R2-sensor (middle room)Normal: LED or LCD graphic on the (C) part turns on Abnormal: LED or LCD graphic on the (C) part turns off

Optichill sensorNormal: LED or LCD graphic on the (D) part turns onAbnormal: LED or LCD graphic on the (D) part turns off

Water tank sensorNormal: LEDs or LCDs graphic on the (E) part turns onAbnormal: LEDs or LCDs graphic on the (E) part turns off

LCD (LED) check function: LCD (LED) Press and hold the Express Freeze button and the Freezer Temperatureadjustment button to check the display. This will turn on the backlight and all display elements.Release the buttons and the display will return to its usual state.

MICOM FUNCTION

- 29 -

The other LED or LCD Graphics Turn On.

2-17. Test Function1. The test function is a self-diagnostic system designed to detect problems early and to make diagnosis and repair easier

and quicker.

2. The test button is on the main PCB. Test mode can run for up to 2 hours and will then default to the normal operationmode if not reset manually.

3. The function buttons are inoperable when the refrigerator is in test mode.

4. When you have finished using the test mode, reset the appliance manually by unplugging it for several seconds.

5. If nonconforming contents such as sensor failure are found during performance of test mode, release the test mode anddisplay the failure code.

6. The test button is inoperable if the display is showing failure codes. Reset the appliance manually to use the test button.

MICOM FUNCTION

- 30 -

Test 1

Test 2

NormalStatus

Mode Operation Contents Remarks

Press test button once(strong cold mode)

Press test button once atthe test mode 1 status(forced defrost mode)

Press test button once atthe test mode 2 status

1. Continuous operation of compressor2. Continuous operation of freezing BLDC motor

(high-speed RPM) and cooling BLDC motor3. Defrost heater turns off4. Stepping motor damper is completely opened

(baffle open)5. Optichill stepping motor damper is completely

closed.6. All display LEDs or LCD graphics turn on.

1. Compressor OFF2. Freezing BLDC motor and cooling BLDC

motor turn off3. Defrost heater turns on4. Stepping motor damper is completely closed

(baffle close)5. Optichill stepping motor damper is completely

closed.6. All display LEDs or LCD graphics turn off.

Except for (A), (B) LCD graphic.Except for (A): 22 (B): 22 LEDs.

Return to the initial status.

Freezer fan is off whendoor is open.

Return to the normal modewhen the defrost sensor isabove +5°C

Compressor will operateafter delay for 7 minutes

EXPRESS DIGITAL CONTROL

FRZ TEMP REF TEMPJET

CUBE

FILTER RESETHOLD 3SECS ROOM TEMP

LOCK

DISPENSER & KEY

WATER

CRUSH3 SECS

FC

FC

FC

FILTER

54321

ICEBEAMCOOLING

CUBE FILTERMONTH

ON

ROOM TEMP

DISPENSER & KEY

WATER 54321

CRUSH3 SECS

EXPRESS FRZ

FC

FC

LOCK

FC

JET

3 SECSFILTER LIGHT

TEST MODE1 STATUS DISPLAY

TEST MODE2 STATUS DISPLAY

2-18. Door-mounted Dispenser1. This feature allows dispensing of ice and water without having to open the refrigerator door.

2. Select CUBES, CRUSHED ICE, or WATER. Then press the dispenser switch. The duct door is operated by a solenoid.This door closes 5 seconds after ice is dispensed.

3. The dispenser does not work if the freezer door is open.

4. The dispenser will turn itself off after 3 minutes even if it does not receive an OFF signal. This prevents damage andoverheating of the motor. The duct door will close 5 seconds after ice is dispensed.

5. The dispenser lamp is turned on and off by the dispenser switch.

6. Selection of Cubes/Crushed/Water1) Select Cubes/Crushed/Water using the selection button2) The default at power-up is Crushed3) The geared motor operates when Cubes or Crushed is selected.

7. Water Dispenser Function1) Select Water using the selection button2) The water line must be connected to the household water supply. The solenoid at the bottom right rear of the

refrigerator operates to supply water. 3) Press the dispenser switch to dispense water.

MICOM FUNCTION

- 31 -

1. Circuit Descriptions

1-1. Power circuitLRSC269****The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting ACto DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback circuit (IC3 and IC4).

Caution : Since high voltage (160 Vdc) is maintained at the power terminal, wait at least 3 minutes after unplugging theappliance to allow the current to dissipate.

Voltage of every part is as follows:

EXPLANATION FOR MICOM CIRCUIT

- 32 -

Part VA1 CE1 CE2 CE3 CE4 CE5

Voltage 120 Vac 160 Vdc 14 Vdc 12 Vdc 15.5 Vdc 5 Vdc

1-2. Oscillation circuitThe oscillation circuit generates a basic clock signal for synchronization and time calculation related to the transmission ofdata and calculations made by the MICOM (IC1). The oscillator (OSC1) must always be replaced with an exact rated part,because if this spec is changes, the time calculations of the MICOM will be affected and it might not work at all.

1-3. Reset circuitThe RESET circuit allows various parts of the MICOM, such as RAM, defrosting, etc., to be restarted from the initial statewhen power is interrupted or restored. A LOW signal applied to the reset terminal for 10 ms causes the MICOM to resetitself. During normal operation, the voltage at the reset terminal is 5 Vdc. If the reset fails, the MICOM will not operate.


- 33 -

LRSC269****

LRSC269****

1-4. Load driving circuit The fan operates at the regular speed even if the door of the refrigerator or freezer is opened. When the doors are closed,

the fan reverts to its original speed. (A), (B), (C), and (D) of door switch for the freezer or refrigerator are connected to the door open sensing circuit in parallel

toward both ends of the switch. In the TEST mode, the fan will stop if any door is opened. It will resume operation when the door is closed.

LRSC269****


- 34 -

REF

REF

Measuring part (IC6) IC6-14 IC6-10 IC7-16 IC6-13 IC6-11 IC6-12

StatusON Within 1 V

OFF 12 V

Type of Load CompressorFrost Removal

HeaterAC Converting

RelayRefrigerator

LAMPDispensor

HeaterMagic room

Heater

1-5. Dispenser operation circuit

Check load driving status

Lever Switch sensing circuit


- 35 -

Measuring part

Lever S/WIC1(Micom) (No. 16)

On(Press)

OFF 5V

0 V(60 Hz)

5 V

Measuring part IC7-15 IC7-14 IC7-13 IC7-12

StatusON Within 1 V

OFF 12 V

Type of LoadGEAREDMOTOR

SOLENOIDCUBE

WATER VALVE

WATER

SOLENOIDDISPENSER

1-6. Door sensing circuitLRSC269****

Since door switches (A) and (B) are interconnected, if either fails, the other will not respond properly. If either switch fails, the light will not come on.


- 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 partIC1 (MICOM) No. 47, 46 Pin

Door of Freezer / Refrigerator

1-7. Temperature sensing circuitLRSC269****

The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and the refrigerator.The Icemaker sensor detects when ice is made. The defrost sensor determines both the need for defrosting and theefficiency of the defrost operation. See the table below for voltages and checkpoints.


- 37 -

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

Freezing sensor POINT A Voltage

Defrost sensor POINT B Voltage

Refrigerator sensor 1 POINT C Voltage

Refrigerator sensor 2 POINT D Voltage 0.5 V~4.5 V 0 V 5 V

Room temperature sensor POINT E Voltage

Water tank sensor POINT F Voltage

Optichill sensor POINT G Voltage

ROOM-SENSOR

WATER TANK-SENSOR

FRZ-SENSOR

DEFROST-SENSOR

REF-UPPER-SENSOR

REF-LOWER-SENSOR

OPTICHILL-SENSOR

1-8. Switch entry circuitThe following circuits sense signal from the test switch, damper motor reed switch for testing and diagnosing therefrigerator.

LRSC269****

1-9. Option designation circuit (model separation function)LRSC269****

The circuits shown above vary according to which features are included on your particular model.

uThese circuits are preset at the factory and cannot be altered.


- 38 -

P3437

R25

CC10223

R24

48 P47

P4647

Separation Connection Status Application Standard

Connection OptiChill existOP1

OUT OptiChill doesn’t exist

1-10. Stepping motor circuit

The motor is driven by magnetism formed in the areas of the coils and the stator. Rotation begins when a HIGH signal isapplied to MICOM Pin 33 of IC10 (TA7774F). This causes an output of HIGH and LOW signals on MICOM pins 34 and 35.

Explanation) The stepping motor is driven by sending signals of 3.33 mSEC via MICOM pins 33, 34, and 35, as shown inthe chart below. These signals are output via terminals 10, 11, 14, and 15 via input terminals 3, 6, and 8 ofIC10 (TA7774F), the motor drive chip. The output signals allow the coils wound on each phase of the stator toform a magnetic field, which causes rotation. Input to the terminals INA and INB of IC10 as shown in the chartbelow drives the motor.


- 39 -

TA7774F

CON9

R56 R57 R58

INA

INB

A

B

A

B

CCW (Reverse rotation) (Positive rotation) CW

1-11. Fan motor driving circuit (freezer, mechanical area)1. The circuit cuts all power to the fan drive IC, resulting in a standby mode.

2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc.

3. This circuit stops the fan motor by cutting off power to the fan when it senses a lock-up condition.

LRSC269****


- 40 -

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

COMPRESSOR-FAN PWM

COMPRESSOR-FAN LOCK

FREEZER-FAN PWM

FREEZER-FAN LOCK

1-12. Temperature compensation circuitLRSC269****

u Temperature compensation table by adjustment value (difference value against current temperature) Ex) If you change compensation resistance of (RCR1) from 10 kΩ (current resistance) to 18 kΩ (modified resistance), the

temperature will increase by +1°C[+1.8°F].


- 41 -

Temperature compensation at refrigerator

Temperature compensation at freezer

R16 R17

Freezer Refrigerator

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]

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]

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

u Temperature compensation table for the refrigerator is as follows:

u Temperature compensation for the freezer is performed the same as for the refrigerator. The value for the freezer is twicethat of the refrigerator.

u This circuit enters the necessary level of temperature compensation for adjusting the appliance. The method is the samefor every model in this appliance family.


- 42 -

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 °C 1 °C 1.5 °C 2 °C 2.5 °C 3 °C 3.5 °C 4 °C 4.5 °C 5 °C470Ω [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 °C 1 °C 1.5 °C 2 °C 2.5 °C 3 °C 3.5 °C 4 °C 4.5 °C2 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 °C 1 °C 1.5 °C 2 °C 2.5 °C 3 °C 3.5 °C 4 °C3.3 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 °C 1 °C 0.5 °C No 0.5 °C 1 °C 1.5 °C 2 °C 2.5 °C 3 °C 3.5 °C5.6 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 °C 1 °C 0.5 ° No 0.5 °C 1 °C 1.5 °C 2 °C 2.5 °C 3 °C8.2 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]

Refrigerator Down Down Down Drop change Up Up Up Up Up Up

(RCR1) 2.5 °C 2 °C 1.5 °C 1 °C 0.5 °C No 0.5 °C 1 °C 1.5 °C 2 °C 2.5 °C10 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]

Down Down Down Down Down change Up Up Up Up Up

3 °C 2.5 °C 2 °C 1.5 °C 1 °C 0.5 °C No 0.5 °C 1 °C 1.5 °C 2 °C12 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 °C 3 °C 2.5 °C 2 °C 1.5 °C 1 °C 0.5 °C No 0.5 °C 1 °C 1.5 °C18 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 °C 3 °C 2.5 °C 2 °C 1.5 °C 1 °C 0.5 °C No 0.5 °C 1 °C33 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 °C 4 °C 3.5 °C 3 °C 2.5 °C 2 °C 1.5 °C 1 °C 0.5 °C No 0.5 °C56 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 Up

5 °C 4.5 °C 4 °C 3.5 °C 3 °C 2.5 °C 2 °C 1.5 °C 1 °C 0.5 °C No180 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

Modificationresistance

Currentresistance

Compensation circuit for temperature of freezer

LRSC269****

u This circuit allows adjustment of the set temperature for compensation by changing jumpers at locations JCR1~JCR4.


- 43 -

R18

R19

R20

R21

R22

R23

Compensation Compensation for weak-cold for over-cold Temperature compensation value Remarks

JCR3 JCR4 JCR1 JCR2of refrigerator

0 °C (In shipment from factory)

CUT -1 °C [-1.8 °F]

CUT -1 °C [-1.8 °F]

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 CUT -1 °C [-1.8 °F]

CUT CUT CUT +1 °C [+1.8 °F]

CUT CUT CUT CUT 0 °C [0 °F]

Temperature compensation in 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]

1-13. Communication circuit The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and thededicated MICOM of the LED (LCD) Display PCB.

A bi-directional lead wire assembly between the two boards is required for the display to function properly.

Poor communication occurs if a continuous information exchange fails to last more than 2 minutes between main MICOM ofmain PCB and LCD (LED) dedicated MICOM for LCD (LED) control of display PCB.

LRSC269****


- 44 -

ICEBEAMCOOLING

OFF

CUBE FILTERMONTH

EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOOK

ROOM TEMP

DISPENSER & KEY

F

WATER 54321

CRUSH

F F

3 SECS

PWBASSEMBLYDISPLAY

Main MICOM LCD(LED) dedicated MICOM

DC 12V

GND

Transmission (error status)

Reception (notch status)

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

Sensor resistance characteristics table

u Resistance value allowance of sensor is ±5%. u When measuring the resistance value of the sensor, allow the temperature of that sensor to stabilize for at least 3 minutes

before measuring. This delay is necessary because of the sense speed relationship. u Use a digital tester to measure the resistance. An analog tester has too great a margin of error.u Resistance of the cold storage sensor 1 and 2 should 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.


- 45 -

Measuring Temperature (°C) Freezing Sensor Cold storage sensor 1&2

Frost removal sensor, Outside sensor

-20 °C (-4 °F) 22.3 kΩ 77 kΩ

-15 °C (5 °F) 16.9 kΩ 60 kΩ

-10 °C (14 °F) 13.0 kΩ 47.3 kΩ

-5 °C (23 °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

1-14. OptiChill stepping MOTOR/DisplayLRSC26944**, LRSC26930**, LRSC26980TT

1-15. Jet freezing LRSC26944**, LRSC26930**


- 46 -

DAMPER HEATEROPTICHILL

OPTICHILLSTEPPINGMOTOR

OPTICHILLSENSOR

PWB ASSEMBLY DISPLAY

JET/FREEZERBOX FAN MOTOR

2. PWB parts diagram and list

2-1. PWB Assembly, main part diagramLRSC269****


- 47 -

2-2. Parts listLRSC269****


- 48 -


- 49 -

2-3. LRSC26944**, LRSC26980TTDISPLAY ASSEMBLY part diagram


- 50 -

DISPLAY circuit diagram


- 51 -

2-4. LRSC26910**, LRSC26911**, LRSC26920**, LRSC26922**, LRSC26930**DISPLAY ASSEMBLY part diagram


- 52 -

DISPLAY circuit diagram


- 53 -

PWB ASSEMBLY DISPLAY

3. PWB Circuit Diagram may vary according to model.

LRSC269****


- 54 -

REF-

REF-


- 55 -

ROOM-SENSOR

WATER TANK-SENSOR

FREEZER-SENSOR

DEFROST-SENSOR

FRZ-DOOR SWITCH

JET FREEZERBOX FAN MOTOR

PCB

ASS

EMB

LY D

ISPL

AY

PCB ASSEMBLY DISPLAY

REF-DOOR SWITCH

REF-UPPER-SENSOR

REF-LOWER-SENSOR

Only Models LRSC26944**, LRSC26980TTDAMPER HEATEROPTICHILL

OPTICHILL STEPPING MOTOR

OPTICHILL BOX FAN MOTOR

OPTICHILL SENSOR

1. Operation Principle

1-1. Operation Principle of Icemaker

1. Turning the Icemaker stop switch off (O) stops the icemaking function.2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control.

OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER

- 56 -

• Adjusts EJECTOR to Start Position with power on.

Power On

Start Position

IcemakingMode

DumpMode

Park Position

Fill

Test Mode

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

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

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

• To operate LINE and SERVICE, press and hold the water supply control switch for 3 seconds. The icemaker will run through 3 stages: Dump Fill Icemaking.

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

2. Control Method

2-1. Start Position1. After POWER OFF or Power Outage, check the EJECTOR's position with MICOM initialization to restart. 2. How to check if it is in place:

- Check HIGH/LOW signals from HALL SENSOR in MICOM PIN. 3. Control Method to check if it is in place:

(1) EJECTOR is in place,- It is an initialized control, so the mode can be changed to ice making control.

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

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

2-2. Icemaking Mode1. Icemaking control refers to the freezing of supplied water in the ice trays. Complete Icemaking operations by measuring

the temperature of the Tray with Icemaking SENSOR. 2. Icemaking starts after completing fulfilled ice control and initial control.3. The Icemaking function is completed when the sensor reaches 19°F(-7°C), 60 to 240 minutes after starting.4. If the temperature sensor is defective, the Icemaking function will be completed in 4 hours.

2-3. Harvest with Dump Mode1. Harvest with Dump control refers to the operation of dropping cubes into the ice bin from the tray when Icemaking has

completed.2. Harvest with Dump control mode:

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

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

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


- 57 -

Heateron

off

on

0V

5V

off

30 sec.

10 sec.

Motor

Hall IC

Ice removingcompletion point

2 ms

Icemaking sensor temperature is 50°F(10˚C) or more Max. 18 minutesAfter detect LEVER rises

2-4. Fill / Park Position1. When Ice-Removing control (Normal Ice-Removing control, Ice-Removing control for test) has completed, and the

EJECTOR is in place, this control operates the ICE SOLENOID by time check in the compressor enclosure of therefrigerator. Then it supplies water to the ice making tray.

2. The water supply level is adjustable to 5 levels by pressing the water supply control switch. The selected level willdetermine the fill time.

Water supply amount TABLE


- 58 -

STAGE TIME TO SUPPLY INDICATIONS REMARKS

1

2

3

4

5

4 sec.

4.5 sec.

5 sec.

5.5 sec.

6 sec.

The water amount will vary depending

on the water control Switch setting as

well as the water pressure of the

connected water line.

2-5. Function TEST1. This is a compulsory operation for TEST, SVC, cleaning, etc. It is operated by pressing the water supply control KEY for 3 seconds.

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

3. If the water supply control KEY is pressed for 3 seconds in the Icemaking mode (no matter what condition the Ice-Makingtray is in) the Ice-Removing operation starts immediately. Water is not yet frozen, so water is poured instead of ice. If thecontrol doesn’t operate normally in the TEST mode, check and repair as needed.

4. After water is supplied, the normal CYCLE is followed: Icemaking → Dump → Fill → Park Position.

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

Diagnosis TABLE

3. Defect diagnosis function

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

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


- 59 -

STAGE ITEMS INDICATOR REMARKS

1

2

3

4

5

6

HEATER

MOTOR

HALL IC (detection

of position) I

VALVE (Detection of

ICE-FULL)

HALL IC (Detection

of ICE-FULL) II

reset

Five seconds after heater starts, heater willgo off if temperature recorded by sensor is10°C or lever is in up position.

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

You can confirm Hall IC detection of position.

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

You can check whether hall is sensing Fullice condition. (If there is a ICE-FULL error,the fifth LED is not on.)

5 seconds after the last step is completed,the icemaker resets itself to its initial state.

NO DIVISION INDICATOR CONTENTS REMARKS

1

2

3

Normal

IcemakingSensor

malfunction

Icemaker Kitmalfunction

Mark time tosupply

Mark previous status on TEST mode

None

Cut or short-circuited wire

When ejector blades doesn’treach park position in 18 minutes

after Dump Mode starts.

Display switch operates properly

Make sure that the wireon each sensor is

connected.

Defects of HALL IC/MOTOR/HEATER/RELAY/

STALLED EJECTOR.

CIRCUIT

- 60 -

LRSC26944**, LRSC26980TT

CIRCUIT

- 61 -

LRSC26930**

FREEZER

FREEZER

FREEZER

COMPRESSOR

REF-UPPER

REF-LOWER

REF

REF-DOORSWITCH

ICEMAKERKIT

FREEZER-LAMP

FREEZER-DOORSWITCH

CIRCUIT

- 62 -

LRSC26920**, LRSC26922**

FREEZER

FREEZER

FREEZER

COMPRESSOR

REF-UPPER

REF-LOWER

REF

REF

DISPENSERLEVER SWITCH

FREEZER-DOORSWITCH

FREEZER-LAMP

Troubleshooting

TROUBLE DIAGNOSIS

- 63 -

PROBLEM CAUSE/CHECK POINTS REMARKS

1. Faulty start1) No power at 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 terminalmovement.

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

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

Check the resistance of bothterminals.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 onpower cord.

OLP is off.

No electric power on compressor. - Faulty compressor.

Faulty PTC.

Disconnected copper wire.

Internal electrical short.

Faulty terminal contact.

Disconnected.

Capacity of OLP is small.

Characteristics of OLP is bad.

Bad connection.

Power is disconnected.

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 betweenmale terminal.

- Thin female terminal.

Terminal disconnected.

Bad sleeve assembly.

Power cord is disconnected.

Faulty soldering.

Start automatic defrost.Cycle was set at defrost when the refrigeratorwas produced.

Power does not conduct. - Damage.

Bad characteristics. - Initial resistance is big.

Bad connection withcompressor.

Bad terminal connection.

Too loose.Assembly is not possible.

TROUBLE DIAGNOSIS

- 64 -


2. No cooling. 2) Refrigeration system is clogged. Heat a clogged evaporator tocheck it. As soon as thecracking sound starts, theevaporator will begin tofreeze.

The evaporator does not coolfrom the beginning (no evidence of moistureattached).The evaporator is the sameas before even heat isapplied.

Moistureclogged.

No electricpower onthermo-stat.

Weld jointclogged.

Drier clogging.

Foreign material clogging.

Residual moisturein the evaporator.

Residual moisture.

Insufficient driercapacity.

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.

Too short time.Low air pressure.Less dry air.

Air Blowing.

Leave it in the air.

Caps are missed.

Short pipe insert.

Pipe gaps.

Too much solder.

Too large.Damaged pipes.

Not dried in the compressor.Elapsed more than 6 months after dryingCaps are missed.No pressure when it is open.

During rest time.

After work.

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

Not performed.Too short.Impossible moistureconfirmation.Low air pressure.

Dry drier - Drier temperature.

Leave it in the air.

The capillary tube inserted depth. - Too much.

Capillary tube melts. - Over heat.

Clogged with foreign materials.

Reduced cross section by cutting. - Squeezed.

Desiccant powder.Weld oxides.Drier angle.

Check on packagecondition.Good storage afterfinishing.

TROUBLE DIAGNOSIS

- 65 -


3. Refrigeration is weak.

Plateheater

Cordheater

1) Refrigerant Partly leaked.

2) Poor defrosting capacity.

Drain path (pipe) clogged.

Defrost heater does not generate heat.

Weld joint leak.Parts leak.

Inject adiabatics into drainhose.

Foreign materialspenetration.

Cap drain is not disconnected.

Inject through thehole.Seal with drain.

Adiabatics lump input.Damage by a screw orclamp.Other foreign materials input.

Parts disconnected.

Wire is cut.- Heating wire.- Contact pointbetween heatingand electric wire.

Dent by fin evaporator.Poor terminal contacts.

Wire is cut.- Lead wire.- Heating wire.- Contact pointbetween heating andelectric wire.

Heating wire is corroded- Water penetration.Bad terminal connection.

Check visually.

Check terminal Conduction: OK.No conduction: NG.If wire is not cut, refer toresistance.P=PowerV=VoltageR=Resistance

V2P= —

R

V2R= —

P

- 66 -

TROUBLE DIAGNOSIS



3) Cooling air leak.

4) No cooling air circulation.

Residualfrost.

No automatic defrosting.

Defrost does not return.

Bad gasket adhestion

Door sag.

Faulty fan motor.

Weak heat from heater.

Too 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

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 doorattachment.Door liner(dimension).Contraction innerliner.Misalignment.Bad terminalconnection.Adiabatics liquidleak.

Faults.

Refrigerator and freezer switch reversed.Button is not pressed.

No contact to drain.Loosened stopper cord.

Not touching theevaporator pipe.Location of assembly(top and middle).

Check the fan motorconduction: OK.No conduction: NG.

TROUBLE DIAGNOSIS

- 67 -



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 airdischarge.

Fan is constrained.

Insufficientmotor 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.

Adiabatics liquid dump.The EPS (styrofoam) drip tray has sediment in it.A screw or other foreign material has fallen into the driptray or damper.

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

Check visually afterdisassembly.

Check visually afterdisassembly.

TROUBLE DIAGNOSIS

- 68 -


4. Warmrefrigeratorcompartmenttemperature.

5. No automaticoperation.(faulty contacts)

6. Condensation and ice formation.

1) Clogged cooling path.

2) Food storage.

1) Faulty temperature sensor in freezer or refrigerator compartment.

2) Refrigeration load is too much.

3) Poor insulation.4) Bad radiation.

5) Refrigerant leak.6) Inadequate of refrigerant.7) Weak compressor discharging power.

8) Fan does not work.9) Button is set at strong.

1) Ice in freeezer compartment.

2) Condensation in the refrigerator compartment.

3) Condensation on liner foam.

Adiabatics liquid leak.Foreign materials. –– Adiabatics dump liquid.

Faulty contact.Faulty temperature characteristics.

External air inflow. –– Bushing installed incorrectly.Door opens but not closes.

Gap around gasket. –– Contraction, distortion, loose, door twisted, corner notfully inserted.

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

Door opensbut not closes.

Gasket gap.

Cool air leakand transmitted.

High ambient temperature.Space is secluded.

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 closing. – Partially open.

Too much food.Hot food.

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

Insufficient closing.Door sag.Food hinders door closing.

Top table part.Out plate Ref/Lower part.

Not fully filled.

Flange gap. –– Not sealed.Gasket gap.

Inspect parts measurementsand check visually.

TROUBLE DIAGNOSIS

- 69 -


6. Condensation and ice formation.

7. Sounds

4) Condensation on door.Condensation on the duct door. - Duct door heater is cut.Condensation on thedispense recess.

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

Adiabatics liquid contraction.

Condensationon the gasketsurface.

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.inserted. Sound from vibration.

Restrainer.Bushing Too hard.seat. Distorted.

Aged.Burnt.

Stopper. Bad Stopper Not fitassembly. (inner

diameterof stopper).Tilted.Not

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

OLP sound. Chattering sound.Insulation paper vibration.

Capacitor noise. Pipe contacts each other. – Narrow interval.Pipe sound. 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.

TROUBLE DIAGNOSIS

- 70 -


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 fancontact.

Unbalanced fan sounds.

Motor shaftcontact 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 rubber seat.

Bad torque for assembling motorbracket.

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

Unbalanced

Ice on the fan. –– Air intake (opposite to motorbushing assembly.)

Supporter distorted.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 expansionand contraction.

Damaged heater cord.Narrow evaporator interval.

Surface machining conditions.Fan distortion.Misshappen.Burr.

TROUBLE DIAGNOSIS

- 71 -


8. Faulty lamp(freezer andrefrigeratorcompartment).

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 switches are reversed.Travel distance.Bad connection.Bad terminal contact.Adiabatics 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 andnon-conduction parts andcheck with tester. Conduction: NG.Resistance∞: OK.

TROUBLE DIAGNOSIS

- 72 -


10. Structure, appearance,and others.

1) Door foam.Sag.

Noise duringoperation.

Malfunction.

2) Odor.Temperature of refrigeratorcompartment.

Deodorizer.

Food Storage.

Others.

Hinge loose

Weak gasketadhesion.Fixed tape.

Hinge interference.

Not closed Interference between door liner and inner liner.Refrigeratorcompartment is opened when freezercompartment is closed (faulty stopper).

High. Faulty damper control.Button is set at weak.Door is open (interference byfood).

No deodorizer.Poor capacity.

Seal condition.Storage of fragrant foods.Long term storage.

Odors from cleaners or items which should notbe stored in a refrigerator.

Bigger door foam.Hinge-Pin tilted-Poor flatness.No washer.No grease.

Stopper worn out.Bad freezer compartment doorassembly.No stopper.

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

Not well fixed.

11. P

ow

er

12.

Co

mp

ress

or

TROUBLE DIAGNOSIS

- 73 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

No

pow

er o

n -

Pow

er c

ord

cut.

- C

heck

the

volta

ge w

ith a

test

er.

-Rep

lace

the

com

pone

nts.

outle

t.-

Fau

lty c

onne

ctor

inse

rtio

n.-

Che

ck v

isua

lly.

-Rec

onne

ct th

e co

nnec

ting

part

s.

- F

aulty

con

nect

ion

betw

een

plug

- C

heck

vis

ually

.-R

econ

nect

the

conn

ectin

g pa

rts.

and

adap

ter.

Fus

e bl

ows

out.

- S

hort

circ

uit b

y w

rong

con

nect

ion.

- C

heck

the

fuse

with

test

er-

Fin

d an

d re

mov

e th

e ca

use

of

- R

epla

ce w

ith r

ated

- Lo

w v

olta

ge p

rodu

cts

are

or v

isua

lly.

prob

lem

(ex

. sho

rt, h

igh

volta

ge,

fuse

afte

r co

nfirm

ing

conn

ecte

d to

hig

h vo

ltage

.-

Che

ck th

e in

put v

olta

ge w

ith a

test

er.

low

vol

tage

).

its s

peci

ficat

ion.

- S

hort

circ

uit b

y in

sect

s.(b

etw

een

pow

er c

ord

and

prod

ucts

).-

Rep

lace

with

rat

ed fu

se.

- E

lect

ricity

leak

age.

- C

heck

the

resi

stan

ce o

f pow

er c

ord

If

fuse

blo

ws

out

- H

igh

volta

ge.

with

test

er (

if it

is 0

Ω, i

t is

shor

ted)

.fr

eque

ntly

, con

firm

- S

hort

circ

uit o

f com

pone

nts

the

caus

e an

d pr

even

t.

(tra

ckin

g du

e to

moi

stur

e an

d du

st

pene

trat

ion)

.

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Com

pres

sor

- F

aulty

PT

C.

- C

heck

the

resi

stan

ce.

- If

resi

stan

ce is

infin

ite, r

epla

ce it

does

not

V

laue

:∞is

def

ectiv

e.w

ith n

ew o

ne.

oper

ate.

- If

it is

not

infin

ite, i

t is

norm

al.

- C

heck

oth

er p

arts

.

- C

ompr

esso

r is

froz

en.

- If

com

pres

sor

asse

mbl

y pa

rts

are

- D

urin

g fo

rced

ope

ratio

n:

norm

al (

capa

cito

r, P

TC

, OLP

),

- O

pera

tes:

Che

ck o

ther

par

ts.

appl

y po

wer

dire

ctly

to th

e -

Not

ope

rate

: Rep

lace

the

froz

en

com

pres

sor

to fo

rce

oper

atio

n.co

mpr

esso

r w

ith n

ew o

ne, w

eld,

evac

uate

, and

rec

harg

e re

frig

eran

t.

OLP

It

sta

rts

as s

oon

as it

is•

Ref

er to

wel

d re

pair

proc

edur

es.

cont

acte

d.

Aux

iliar

y w

indi

ng

Mai

n w

indi

ng

Pow

er

13. T

emp

erat

ure

TROUBLE DIAGNOSIS

- 74 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Hig

h P

oor

cool

air

circ

ulat

ion

due

to fa

ulty

- Lo

ck –

– C

heck

res

ista

nce

with

a

- R

epla

ce fa

n m

otor

.

tem

pera

ture

fan

mot

or.

test

er.

in th

e fr

eeze

r0Ω

: sho

rt.

com

part

men

t.∞

Ω: c

ut.

- R

econ

nect

and

rei

nser

t.

- R

otat

e ro

tor

man

ually

and

che

ck

rota

tion.

- W

ire is

cut

.

- B

ad te

rmin

al c

onta

ct: C

heck

-

Mai

ntai

n cl

eara

nce

and

rem

ove

ice

term

inal

vis

ually

.(R

epai

r an

d/or

rep

lace

shr

oud

if fa

n

- F

an c

onst

rain

t. –

Fan

shr

oud

is c

onst

rain

ed b

y sh

roud

cont

act:

Con

firm

defo

rmat

ion)

.

visu

ally

.

– F

an ic

ing:

Con

firm

vis

ually

.

Fau

lty fa

n m

otor

due

to fa

ulty

doo

r -

Iced

but

ton

(fau

lty)

oper

atio

n:-

Con

firm

icin

g ca

uses

and

rep

air.

switc

h op

erat

ion.

Pre

ss b

utto

n to

che

ck-

Rep

lace

doo

r sw

itch.

- F

aulty

but

ton

pres

sure

and

con

tact

:

Pre

ss b

utto

n to

che

ck o

pera

tion.

- D

oor

cann

ot p

ress

doo

r sw

itch

- D

oor

sag:

fix

door

.

butto

n: C

heck

vis

ually

.-

Doo

r lin

er b

ent:r

epla

ce d

oor

or

atta

ch s

heet

s.

Bad

rad

iatio

n co

nditi

ons

in

- C

heck

the

clea

ranc

e be

twee

n th

e -

Kee

p cl

eara

nce

betw

een

- T

he fa

n m

ay b

e

com

pres

sor

com

part

men

t.re

frig

erat

or a

nd w

all (

50 m

m in

re

frig

erat

or a

nd w

alls

(m

inim

um

brok

en if

cle

anin

g

min

imum

).50

mm

).pe

rfor

ms

whi

le th

e

- C

heck

dus

t on

the

grill

in

- R

emov

e du

st a

nd c

onta

min

ants

re

frig

erat

or is

on.

com

pres

sor

com

part

men

t.fr

om g

rill f

or e

asy

heat

rad

iatio

n.

- C

heck

dus

t on

the

cond

ense

r co

ils.

- R

emov

e th

e du

st w

ith v

acuu

m

clea

ner

from

the

coils

con

dens

er

whi

le th

e re

frig

erat

or is

off.

14. C

oo

ling

TROUBLE DIAGNOSIS

- 75 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Hig

h R

efrig

eran

t lea

k.C

heck

seq

uenc

eW

eld

the

leak

ing

part

, rec

harg

e th

eD

rier

mus

t be

repl

aced

.

tem

pera

ture

1. C

heck

the

wel

ded

part

s of

the

refr

iger

ant.

in th

e fr

eeze

rdr

ier

inle

t and

out

let a

nd d

rier

com

part

men

t.au

xilia

ry in

the

com

pres

sor

com

part

men

t (hi

gh p

ress

ure

side

).

2. C

heck

the

end

of c

ompr

esso

r

seal

ing

pipe

(lo

w p

ress

ure

side

).

3. C

heck

silv

er s

olde

red

part

s.

(Cu

+ F

e / F

e +

Fe)

.

4. C

heck

ben

ding

are

a of

wire

cond

ense

r pi

pe in

com

pres

sor

com

part

men

t (cr

acks

can

happ

en d

urin

g be

ndin

g).

5. C

heck

oth

er p

arts

(co

mpr

esso

r

com

part

men

t and

eva

pora

tors

in

free

zer

com

part

men

t).

Sho

rtag

e of

ref

riger

ant.

Che

ck fr

ost f

orm

atio

n on

the

surf

ace

- F

ind

out t

he le

akin

g ar

ea, r

epai

r,D

rier

mus

t be

repl

aced

.

of e

vapo

rato

r in

the

free

zer

evac

uate

, and

rec

harg

e th

e

com

part

men

t.re

frig

eran

t.

- If

the

fros

t for

ms

even

ly o

n th

e -

No

leak

ing,

rem

ove

the

rem

aini

ng

surf

ace,

it is

OK

.re

frig

eran

t, an

d re

char

ge n

ew

- If

it do

es n

ot, i

t is

not g

ood.

refr

iger

ant.

TROUBLE DIAGNOSIS

- 76 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Hig

h C

ycle

pip

e is

clo

gged

.C

heck

seq

uenc

e.-

Hea

t up

com

pres

sor

disc

harg

ing

Dire

r m

ust b

e re

plac

ed.

tem

pera

ture

in1.

Che

ck te

mpe

ratu

re o

f con

dens

erw

eld

join

ts w

ith to

uch,

dis

conn

ect

the

free

zer

man

ually

.th

e pi

pes,

and

che

ck th

e cl

oggi

ng.

com

part

men

t.If

it is

war

m, O

K.

Rem

ove

the

caus

es o

f clo

ggin

g,

If it

is n

ot, c

ompr

esso

r di

scha

rgin

gw

eld,

eva

cuat

e, a

nd r

echa

rge

join

ts m

ight

be

clog

ged.

the

refr

iger

ant.

2. M

anua

lly c

heck

whe

ther

hot

line

- If

it's

war

m, O

K. I

f it's

not

,

pipe

is w

arm

.co

nden

ser

disc

harg

ing

line

wel

d

If it

is w

arm

, OK

.jo

ints

mig

ht b

e cl

ogge

d.

If it

is n

ot, c

onde

nser

out

let w

eld

Dis

conn

ect w

ith to

rch,

rem

ove

the

join

ts m

ight

be

colg

ged.

caus

es, e

vacu

ate,

and

rec

harg

e

seal

ref

riger

ant.

Leak

at l

oop

pipe

wel

d jo

int

Che

ck s

eque

nce.

Rep

lace

the

com

pres

sor,

wel

d,

Drie

r m

ust b

e re

plac

ed.

(dis

char

ge)

in c

ompr

esso

r.1.

Man

ually

che

ck w

heth

er

evac

uate

, and

rec

harg

e re

frig

eran

t.

cond

ense

r is

war

m, I

t is

not w

arm

and

the

fros

t for

ms

part

ly o

n th

e

evap

orat

or in

the

free

zer

com

part

men

t.

Fau

lty c

oolin

g fa

n in

the

com

pres

sor

Che

ck s

eque

nce.

- R

epla

ce if

mot

or d

oes

not o

pera

te.

com

part

men

t.1.

Che

ck c

oolin

g fa

n op

erat

ion.

- If

fan

is d

isco

nnec

ted,

che

ck fa

n

2. C

heck

that

coo

ling

fan

is

dam

age

and

reas

sem

ble

it.

disc

onne

cted

from

the

mot

or.

R

efer

to fa

n m

otor

dis

asse

mbl

y

and

asse

mbl

y se

quen

ce.

15. D

efro

stin

g f

ailu

re

TROUBLE DIAGNOSIS

- 77 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

No

defr

ostin

g.H

eate

r do

es n

ot g

ener

ate

heat

as

1. C

heck

the

resi

stan

ce o

f hea

ter.

Hea

ting

wire

is s

hort

and

wire

is c

ut.

Sea

l the

lead

wire

with

the

heat

ing

wire

is c

ut o

r th

e ci

rcui

t0Ω

: Sho

rt. ∞

Ω: C

ut.

• P

arts

rep

lace

men

t: R

efer

to p

arts

insu

latio

n ta

pe a

nd h

eat

is s

hort

ed.

Ten

s to

thou

sand

s Ω

: OK

.ex

plan

atio

ns.

shrin

k tu

be if

the

cut

1) H

eatin

g w

ire is

dam

aged

whe

n 2.

Che

ck th

e re

sist

ance

bet

wee

n le

ad w

ire is

acc

essi

ble

to

inse

rtin

g in

to th

e ev

apor

ator

.ho

usin

g te

rmin

al a

nd h

eate

rre

pair.

2) L

ead

wire

of h

eate

r is

cut

.su

rfac

e.

3) H

eatin

g w

ire a

t lea

d w

ire c

onta

cts

0Ω: S

hort

. ∞Ω

: Cut

.

is c

ut.

Ten

s to

thou

sand

s Ω

: Sho

rt.

Suc

tion

tube

and

dis

char

ge o

rific

e:

1. C

onfir

m fo

reig

n m

ater

ials

. In

case

1) P

ush

out i

mpu

ritie

s by

inse

rtin

g

1. Im

purit

ies.

of ic

e, in

sert

the

copp

er li

ne

copp

er w

ire. (

Tur

n of

f mor

e th

an

2. Ic

e.th

roug

h th

e ho

le to

che

ck.

3 ho

urs

and

pour

in h

ot w

ater

if

2. P

ut h

ot w

ater

into

the

drai

nfr

ost i

s se

vere

.)

(che

ck d

rain

s ou

tsid

e).

2) P

ut in

hot

wat

er to

mel

t dow

n fr

ost.

3) C

heck

the

wat

er o

utle

t.

4) P

ush

the

heat

er p

late

to s

uctio

n

duct

man

ually

and

ass

embl

e th

e

disc

onne

cted

par

ts.

Gap

bet

wee

n S

uctio

n du

ct a

nd1.

Con

firm

in th

e S

uctio

n du

ct.

1) T

urn

off t

he p

ower

, con

firm

Hea

ter

plat

e (I

ce in

the

gap)

.im

purit

ies

and

ice

in th

e ga

p, a

nd

supp

ly h

ot w

ater

unt

il th

e ic

e in

the

gap

mel

ts d

own.

2) P

ush

the

Hea

ter

plat

e to

dra

in

botto

m w

ith h

and

and

asse

mbl

e

the

disc

onne

cted

par

ts.

Wro

ng h

eate

r ra

ting

(or

wro

ng

1. C

heck

hea

ter

labe

l.F

aults

:rep

lace

.

asse

mbl

y).

2. C

onfir

m th

e ca

paci

ty a

fter

- H

ow to

rep

lace

:

subs

titut

ing

the

resi

stan

ce v

alue

Ref

er to

mai

n pa

rts.

into

the

form

ula.

(V: R

ated

vol

tage

of u

ser c

ount

ry)

(R: R

esis

tanc

e of

test

er[Ω

])

Com

pare

P a

nd la

vel c

apac

ity.

Tole

ranc

e: ±

7%

V2

P=

–– R

TROUBLE DIAGNOSIS

- 78 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

No

defr

ostin

gM

eltin

g fu

se b

low

s.-

Che

ck m

eltin

g fu

se w

ith te

ster

. -

Fau

llty

part

s: p

arts

rep

lace

men

t.

1) L

ead

wire

is c

ut.

If 0Ω

: OK

.-

Che

ck w

ire c

olor

whe

n m

aeas

urin

g

2) B

ad s

olde

ring.

If ∞

Ω: w

ire is

cut

.re

sist

ance

with

a te

ster

.

Ice

in th

e S

uctio

n du

ct.

1. C

heck

the

inne

r du

ct w

ith m

irror

.1)

Tur

n po

wer

off.

1) Ic

ing

by fo

reig

n m

ater

ials

in th

e2)

Rai

se th

e fr

ont s

ide

(doo

r si

de),

duct

.su

ppor

t the

fron

t sid

e le

gs, a

nd le

t

2) Ic

ing

by c

ool a

ir in

flow

thro

ugh

the

ice

mel

t nat

ural

ly. (

If po

wer

is

the

gap

of h

eate

r pl

ate.

on, m

elt t

he fr

ost b

y fo

rced

3) Ic

ing

by th

e ga

p of

hea

ter

plat

e.de

fros

ting.

)

2. C

heck

by

inse

rtin

g so

ft co

pper

3)

Rea

ssem

ble

the

heat

er p

late

.

wire

into

the

duct

(so

ft an

d th

in

copp

er n

ot to

impa

ir he

atin

g w

ire).

Bad

coo

l air

inflo

w a

nd d

isch

arge

, 1.

Tur

n on

pow

er, o

pen

or c

lose

the

1) C

heck

the

faul

ty c

onne

ctor

of

and

bad

defr

ostin

g du

e to

faul

tydo

or, c

heck

that

mot

or fa

n ho

usin

g an

d re

asse

mbl

e w

rong

ly

cont

act a

nd in

sert

ion

(bad

con

nect

orop

erat

es (

If it

oper

ates

, mot

or fa

nas

sem

bled

par

ts.

inse

rtio

n in

to h

ousi

ng o

f hea

ter,

is

OK

).2)

If th

e pa

rts

are

dam

aged

,

mel

ting,

fuse

, and

mot

or fa

n).

2. D

isco

nnec

t par

ts in

the

refr

iger

ator

rem

ove

the

part

s an

d re

plac

e it

com

part

men

t, ch

eck

the

conn

ectio

nw

ith a

new

one

.

arou

nd th

e ho

usin

g vi

sual

ly,

defr

ost,

and

conf

irm h

eat g

ener

atio

n

on th

e he

ater

. Do

not p

ut h

ands

on

the

shea

th h

eate

r.

3. C

heck

the

part

s w

hich

hav

e fa

ults

desc

ribed

in 1

& 2

(m

echa

nica

l

mod

el: d

isco

nnec

t the

rmos

tat

from

the

asse

mbl

y).

16. I

cin

g

TROUBLE DIAGNOSIS

- 79 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Icin

g in

the

1) B

ad c

ircul

atio

n of

coo

l air.

- C

heck

the

food

is s

tore

d pr

oper

ly-

Be

acqu

aint

ed w

ith h

ow to

use

.-

Che

ck th

e de

fros

t

refr

iger

ator

-

Clo

gged

inta

ke p

ort i

n th

e (c

heck

dis

char

ge a

nd in

take

por

t -

Sea

ling

on c

onne

ctin

g pa

rts.

rela

ted

part

s if

prob

lem

com

part

men

t.re

frig

erat

or c

ompa

rtm

ent.

are

clog

ged)

.-

Che

ck th

e da

mpe

r an

d re

plac

eis

cau

sed

by fa

ulty

- D

ampe

r ic

ing.

- S

ealin

g is

not

goo

d.-

Che

ck ic

ing

on th

e su

rfac

e of

it

if it

has

defe

cts.

defr

ostin

g.

- P

ipe

icin

g.-

Too

muc

h fo

od is

sto

red

and

clog

sba

ffle

and

cool

air

path

(pi

pe)

afte

r-

Che

ck d

efro

st. (

Afte

r fo

rced

- D

isch

argi

ngth

e di

scha

rge

port

.di

ssem

blin

g th

e co

ntai

ner

box.

defr

ostin

g, c

heck

ice

in th

e

pipe

icin

g.-

Bad

def

rost

ing.

- C

heck

icin

g at

inta

ke p

orts

of

evap

orat

or a

nd p

ipes

.)

free

zer

and

refr

iger

ator

com

part

men

t.

2) F

aulty

doo

r or

ref

riger

ator

- C

heck

gas

ket a

ttach

ed c

ondi

tions

.-

Cor

rect

the

gask

et a

ttach

men

t-

Rep

lace

men

t sho

uld

com

part

men

t.-

Che

ck d

oor

asse

mbl

y co

nditi

ons.

cond

ition

s an

d re

plac

e it.

be d

one

whe

n it

- F

aulty

gas

ket.

- D

oor

asse

mbl

y an

d re

plac

emen

t.ca

nnot

be

repa

ired.

- F

aulty

ass

embl

y.

3) O

verc

oolin

g in

the

refr

iger

ator

- C

heck

ref

riger

ator

com

part

men

t-

Rep

lace

faul

ty p

arts

.

com

part

men

t.is

ove

rcoo

led

(whe

n bu

tton

- F

aulty

dam

per

in th

e re

frig

erat

orpr

esse

d on

wea

k).

com

part

men

t.-

Che

ck p

arts

are

faul

ty.

- F

aulty

MIC

OM

(fa

ulty

sen

sor)

4) B

ad d

efro

stin

g-

Che

ck fr

ost o

n th

e ev

apor

ator

- C

heck

par

ts r

elat

ed to

def

rost

ing.

- M

oist

ure

does

not

free

ze

- H

eate

r w

ire is

cut

.af

ter

diss

embl

ing

shro

ud a

nd fa

n-

Che

ck d

efro

stin

g. (

Che

ck ic

e on

the

on th

e ev

apor

ator

but

- D

efec

tive

defr

ost s

enso

r.gr

ille.

evap

orat

or a

nd p

ipe.

)ca

n be

suc

ked

into

the

- D

efro

sing

cyc

le.

- C

heck

ice

on in

take

por

t of f

reez

erre

frig

erat

or, w

here

it

and

refr

iger

ator

com

part

men

t.co

nden

ses

and

free

zes.

Thi

s in

terf

eres

with

col

d

air

circ

ulat

ion

and

subl

imat

ion

of th

e ic

e.

5) C

usto

mer

s ar

e n

ot fa

mili

ar w

ith-

Che

ck fo

od in

terf

eres

with

doo

r-

Be

acqu

aint

ed w

ith h

ow to

use

.

this

mac

hine

.cl

osin

g.

- D

oor

open

s.-

Che

ck ic

e on

the

ceili

ngs.

- H

igh

tem

pera

ture

, hig

h m

oist

ure,

and

high

load

.

TROUBLE DIAGNOSIS

- 80 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Ice

in th

e fr

eeze

r 1)

Bad

coo

ling

air

circ

ulat

ion.

- C

heck

food

sto

rage

con

ditio

ns

- B

e ac

quai

nted

with

how

to u

se.

- C

heck

the

part

s re

late

d

com

part

men

t.-

Inta

ke p

ort i

s cl

ogge

d in

the

free

zer

visu

ally

.(C

heck

clo

ggin

g at

inta

ke

- C

heck

def

rost

(C

heck

ice

on th

eto

def

rost

ing

if th

e

- S

urfa

ce o

f fan

com

part

men

t.an

d di

scha

rgin

g po

rt o

f coo

ling

air.

)ev

apor

ator

and

pip

es a

fter

forc

edpr

oble

m is

cau

sed

by

grill

e.-

Dis

char

ging

por

t is

Clo

gged

.-

Che

ck fo

od o

ccup

atio

n ra

tio in

de

fros

ting)

.th

e fa

ulty

def

rost

ing.

- W

all o

f fre

ezer

- T

oo m

uch

food

is s

tore

d.vo

lum

e (L

ess

than

75%

).

com

part

men

t.-

Bad

def

rost

ing.

- C

heck

fros

t on

the

evap

orat

or a

fter

- C

ool a

irdi

ssem

blin

g sh

roud

and

fan

grill

e.

disc

harg

ing

port

.-

Che

ck ic

ing

at in

take

por

t of

- B

aske

t(ra

ck)

refr

iger

ator

com

part

men

t.

area

.

- F

ood

surf

ace.

2) B

ad fr

eeze

r co

mpa

rtm

ent d

oor

- C

heck

gas

ket a

ttach

men

t -

Cor

rect

the

gask

et a

ttach

emen

t-

Rep

lace

whe

n it

can

not

- Ic

ing

in th

e-

Fau

lty g

aske

tco

nditi

ons.

cond

ition

s an

d re

plac

e it.

be r

epai

red.

shut

e.-

Fau

lty a

ssem

bly

- C

heck

doo

r as

sem

bly

cond

ition

s.-

Doo

r as

sem

bly

and

repl

acem

ent.

3) O

ver

free

zing

in th

e fr

eeze

r -

Ref

riger

ator

ope

rate

s pu

ll do

wn.

-Rep

lace

def

ectiv

e pa

rts.

com

part

men

t.(C

heck

if it

is o

pera

ted

- F

aulty

MIC

OM

.in

term

itten

tly)

- T

he T

empe

ratu

re o

f fre

ezer

com

part

men

t is

satis

fact

ory,

but

over

free

zing

hap

pens

in th

e

refr

iger

ator

com

part

men

t eve

n

thou

gh th

e no

tch

is s

et a

t wea

k.

4) B

ad d

efro

stin

g.-

Che

ck fr

ost o

n th

e ev

apor

ator

afte

r-

Che

ck p

arts

rel

ated

to d

efro

stin

g.

- H

eate

r w

ire is

cut

.di

ssem

blin

g sh

roud

and

gril

le.

- C

heck

def

rost

ing.

Che

ck ic

e on

the

- F

aulty

def

rost

sen

sor.

- C

heck

ice

on th

e in

take

por

t in

the

evap

orat

or a

nd p

ipes

afte

r fo

rced

- D

efro

stin

g cy

cle

refr

iger

ator

com

part

men

t.de

fros

ting.

5) U

ser

is n

ot fa

mili

ar w

ith h

ow to

-

Che

ck fo

od h

olds

doo

r op

en.

- B

e ac

quai

nted

with

how

to u

se.

use.

- C

heck

ice

on th

e ic

e tr

ay.

- D

oor

open

s.

- H

igh

moi

stur

e fo

od w

ater

is s

tore

d.

17. S

ou

nd

TROUBLE DIAGNOSIS

- 81 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

His

sso

und

1. L

oud

soun

d of

com

pres

sor

1.1

Che

ck th

e le

vel o

f the

1)

Mai

ntai

n ho

rizon

tal l

evel

.

oper

atio

n.re

frig

erat

or.

2) R

epla

ce b

ushi

ng a

nd s

eat i

f the

y

1.2

Che

ck th

e bu

shin

g se

at

are

sagg

ed a

nd a

ged.

cond

ition

s (s

aggi

ng a

nd a

ging

).3)

Tou

ch th

e pi

ping

at v

ario

us p

lace

alon

g its

rou

te. I

nsta

ll a

dam

per

at

2. P

ipes

res

onat

e so

und

whi

ch is

2.

1 C

heck

the

leve

l of p

ipes

the

poin

t whe

re y

our

tuch

red

uces

conn

ecte

d to

the

com

pres

sor.

conn

ecte

d to

the

com

pres

sor

the

nois

e.

and

thei

r in

terf

eren

ce.

4) A

void

pip

e in

terf

eren

ce.

2.2

Che

ck b

ushi

ng in

sert

ing

5) R

epla

ce d

efec

tive

fan

and

fan

cond

ition

s in

pip

es.

mot

or.

2.3

Tou

ch p

ipes

with

han

ds o

r sc

rew

6) A

djus

t fan

to b

e in

the

cent

er o

f

-driv

er (

chec

k th

e ch

ange

of

the

fan

guid

e.

soun

d).

7) L

eave

a c

lear

ance

bet

wee

n

inte

rfer

ing

part

s an

d se

al g

aps

in

3. F

an o

pera

tion

soun

d in

the

free

zer

3.1

Che

ck fa

n in

sert

ion

dept

h an

d th

e st

ruct

ures

.

com

part

men

t.bl

ade

dam

age.

8) R

eass

embl

e th

e pa

rts

whi

ch m

ake

3.2

Che

ck th

e in

terf

eren

ce w

ith

soun

d.

stru

ctur

es.

9) L

eave

a c

lear

ance

if e

vapo

rato

r

3.3

Che

ck fa

n m

otor

.pi

pes

and

suct

ion

pipe

touc

h

3.4

Che

ck fa

n m

otor

bus

hing

fr

eeze

r sh

roud

.

inse

rtio

n an

d ag

ing

cond

ition

s.

4. F

an o

pera

tion

soun

d in

the

4.1

Sam

e as

fan

conf

irmat

ion

in th

e

com

pres

sor

com

part

men

t.re

frig

erat

or.

4.2

Che

ck d

rip tr

ay le

g in

sert

ion.

4.3

Che

ck th

e sc

rew

fast

enin

g

cond

ition

s at

con

dens

er a

nd

drip

tray

.

TROUBLE DIAGNOSIS

- 82 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Vib

ratio

n so

und.

1. V

ibra

tion

of s

helv

es a

nd fo

ods

in1-

1. R

emov

e an

d re

plac

e th

e

1) R

eass

embl

e th

e vi

brat

ing

part

s

Cla

ck.

the

refr

iger

ator

.sh

elve

s in

the

refr

iger

ator

and

inse

rt fo

am o

r cu

shio

n w

here

2. P

ipes

inte

rfer

ence

and

cap

illar

y1-

2. C

heck

ligh

t foo

d an

d co

ntai

ner

vibr

atio

n is

sev

ere.

tube

touc

hing

in th

e co

mpr

esso

r.on

the

shel

ves.

2) L

eave

a c

lear

ance

whe

re p

arts

com

part

men

t.2-

1. T

ouch

pip

es in

the

com

pres

sor

inte

rfer

e w

ith e

ach

othe

r.

3. C

ompr

esso

r st

oppe

r vi

brat

ion.

com

part

men

t with

han

ds.

3) R

educ

e vi

brat

ion

with

bus

hing

4. M

ovin

g w

heel

vib

ratio

n.2-

2. C

heck

cap

illar

y tu

be to

uche

s an

d re

stra

iner

if it

is s

ever

e.

5. O

ther

str

uctu

re a

nd p

arts

co

ver

back

.(e

spec

ially

com

pres

sor

and

pipe

).

vibr

atio

n.3-

1. C

heck

com

pres

sor

stop

per

4) R

epla

ce c

ompr

esso

r st

oppe

r if

it

vibr

atio

n.vi

btat

es s

ever

ely.

4-1.

Che

ck v

ibra

tion

of fr

ont a

nd r

ear

mov

ing

whe

els.

5-1.

Tou

ch o

ther

str

uctu

res

and

part

s.

Irre

gula

r so

und.

1. It

is c

ause

d by

hea

t exp

ansi

on1-

1 C

heck

tim

e an

d pl

ace

of s

ound

1)

Exp

lain

the

prin

cipl

es o

f ref

riger

atio

n

Clic

k.an

d co

ntra

ctio

n of

eva

pora

tor,

sour

ces.

and

that

the

tem

pera

ture

diff

eren

ce

shel

ves,

and

pip

es in

the

betw

een

oper

atio

n an

d de

fros

ting

refr

iger

ator

.ca

n m

ake

soun

ds.

2) If

eva

pora

tor p

ipe

cont

acts

with

oth

er

stru

ctur

es, l

eave

a c

lear

ance

bet

wee

n

them

(fre

ezer

shr

oud

or in

ner c

ase)

.

TROUBLE DIAGNOSIS

- 83 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Sou

nd P

op

pin

gIt

happ

ens

whe

n re

frig

eran

t exp

ands

- C

heck

the

soun

d of

refri

gera

nt a

t the

- C

heck

the

rest

rain

er a

ttach

ed o

n th

e

(alm

ost t

he s

ame

at th

e en

d of

cap

illar

y tu

be.

initi

al in

stal

latio

n.ev

apor

ator

and

cap

illar

y tu

be w

eld

as a

nim

als

cryi

ng- C

heck

the

soun

d w

hen

the

refri

gera

tor

join

ts a

nd a

ttach

ano

ther

rest

rain

er.

soun

d).

star

ts o

pera

tion

afte

r for

ced

defro

stin

g.- I

f it i

s co

ntin

uous

and

ser

vere

, ins

ert

- Che

ck th

e re

stra

iner

atta

chm

ent

capi

llary

tube

aga

in (d

epth

15±

3mm

)

cond

ition

s on

the

evap

orat

or a

nd- F

aste

n th

e ca

pilla

ry tu

be to

suc

tion

capi

llary

tube

wel

d jo

ints

.pi

pes

or d

etac

h in

the

com

pres

sor

com

partm

ent.

- Exp

lain

the

prin

cipl

es o

f fre

ezin

g

cycl

es.

Wat

er b

oilin

g or

It ha

ppen

s w

hen

refri

gera

nt p

asse

s- C

heck

the

soun

d w

hen

com

pres

sor i

s- E

xpla

in th

e pr

inci

ples

of f

reez

ing

cycl

es

flow

ing

soun

d.or

ifice

in a

ccum

ulat

or in

tern

al p

ipes

by

turn

ed o

n.an

d re

frige

rant

flow

ing

phen

omen

on b

y

the

pres

sure

diff

eren

ce b

etw

een

- Che

ck th

e so

und

whe

n co

mpr

esso

r is

inte

rnal

pre

ssur

e di

ffere

nce.

cond

ense

r and

eva

pora

tor.

turn

ed o

ff.- I

f sou

nd is

ser

vere

, wra

p th

e

accu

mul

ator

with

foam

and

rest

rain

er.

Sou

nd o

f whi

stle

Whe

n do

or c

lose

s, th

e in

tern

al p

ress

ure

- Che

ck th

e so

und

by o

peni

ng a

nd

- Bro

aden

the

cap

of d

isch

arge

hos

e fo

r

whe

n do

or

of th

e re

frige

rato

r dec

reas

es s

harp

lycl

osin

g th

e re

frige

rato

r or f

reez

er d

oors

.de

frost

ing

in th

e co

mpr

esso

r

clos

es.

belo

w a

tom

osph

ere

and

suck

s ai

r int

oco

mpa

rtmen

t.

the

refri

gera

tor,

mak

ing

the

whi

stle

- S

eal t

he g

ap w

ith s

eala

nt b

etw

een

out

soun

d.an

d in

ner c

ases

of h

inge

in d

oor.

18. O

do

r

TROUBLE DIAGNOSIS

- 84 -

Pro

ble

ms

Cau

ses

Ch

ecks

Mea

sure

sR

emar

ks

Foo

d O

dor.

Foo

d (g

arlic

, kim

chi,

etc)

- C

heck

the

food

is n

ot w

rapp

ed.

- D

ry th

e de

odor

izer

in a

sun

ny p

lace

- C

heck

the

shel

ves

or in

ner

with

ade

quat

e ve

ntila

tion.

wal

l are

sta

ined

with

food

juic

e.-

Sto

re th

e fo

od in

the

clos

ed

- B

e su

re fo

od is

sec

urel

y co

vere

dco

ntai

ner

inst

ead

of v

inyl

wra

ps.

with

pla

stic

wra

p.-

Cle

an th

e re

frig

erat

or a

nd s

et

- C

hedk

food

cle

anlin

ess.

butto

n at

str

on

g.

Pla

stic

Odo

r.O

dors

of m

ixed

food

and

pla

stic

-

Che

ck w

et fo

od is

wra

pped

with

-

Cle

an th

e re

frig

erat

or.

odor

s.pl

astic

bow

l and

bag

.-

Per

suad

e cu

stom

ers

not t

o us

e

- It

happ

ens

in th

e ne

w r

efrig

erat

or.

plas

tic b

ag o

r w

raps

with

wet

food

or o

doro

us fo

ods.

Odo

r fr

om th

eO

dor

from

the

old

deod

oriz

er.

- C

heck

the

deod

oriz

er o

dors

.-

Dry

the

deod

oriz

er w

ith d

ryer

and

*D

eodo

rizer

: op

tion

deod

oriz

er.

then

in th

e sh

iny

and

win

dy p

lace

.

- R

emov

e an

d re

plac

e th

e

deod

oran

ts.

19. M

ico

m

TROUBLE DIAGNOSIS

- 85 -

Pro

ble

ms

Sym

pto

mC

ause

sC

hec

ksM

easu

res

Rem

arks

Bad

PC

B

All

disp

lay

Bad

con

nect

ion

Bad

con

nect

orV

isua

l che

ck o

n co

nnec

tor

Rec

onne

ct

elec

tric

pow

er.

LCD

are

off.

betw

een

Mai

n P

CB

co

nnec

tion

from

mai

n co

nnec

tion.

conn

ecto

r.

and

disp

lay

circ

uit.

PC

B to

dis

play

PC

B.

Def

ectiv

e P

CB

P

CB

tran

sfor

mer

C

heck

res

ista

nce

of P

CB

R

epla

ce P

CB

A

pplic

able

to

tran

sfor

mer

.w

indi

ng is

cut

.tr

ansf

orm

er in

put a

nd o

utpu

t tr

ansf

orm

er o

r P

CB

.m

odel

with

out

PC

B tr

ansf

orm

er

term

inal

s w

ith a

test

er.

disp

ense

r.

tem

pera

ture

fuse

is

(If r

esis

tanc

e is

infin

ity, t

rans

burn

t out

.w

indi

ng is

cut

).

Def

ectiv

ePC

B e

lect

ricD

efec

tive

regu

lato

r IC

Che

ck v

olta

ge a

t inp

ut/o

utpu

tR

epla

ce r

egul

ator

.R

efer

to e

lect

ric

circ

uit p

arts

.(7

812,

780

5).

term

inal

s.ci

rcui

t in

circ

uit

expl

anat

ion.

PC

B e

lect

ric te

rmin

alC

heck

fuse

in P

CB

ele

ctric

R

epla

ce P

CB

fuse

.

fuse

is b

urnt

out

.te

rmin

al w

ith a

test

er.

ST

R P

arts

are

C

heck

if S

TR

No.

2 a

nd 3

pin

sR

epla

ce p

arts

.A

pplic

able

to

dam

aged

.ar

e cu

t whe

n po

wer

is o

ff.m

odel

with

disp

ense

r.

Abn

orm

al

Bad

con

nect

ion

Lead

Wire

con

nect

ing

Che

ck L

ead

Wire

term

inal

s R

econ

nect

Lea

d

disp

lay

LCD

betw

een

Mai

n P

CB

m

ain

PC

B a

nd d

ispl

ayco

nnec

ting

Mai

n P

CB

and

W

ire a

nd d

irect

ly

oper

atio

nan

d di

spla

y ci

rcui

t.P

CB

is c

ut o

r co

nnec

tor

disp

lay

PC

B w

ith a

test

er.

conn

ect d

efec

tive

term

inal

con

nect

ion

isco

ntac

t ter

min

al to

bad.

Lead

Wire

.

Def

ectiv

e LC

D.

Def

ectiv

e LC

D.

Che

ck if

all

LCD

are

on

whe

n R

epla

ce d

ispl

ay

Ref

er to

dis

play

Mai

n P

CB

Tes

t sw

itch

is

PC

B.

circ

uit i

n ci

rcui

t

pres

sed

(or

whe

n bo

th fr

eeze

rex

plan

atio

n.

key

and

pow

er fr

eeze

r ke

y ar

e

pres

sed

at th

e sa

me

time

for

mor

e th

an o

ne s

econ

d.)

TROUBLE DIAGNOSIS

- 86 -

Pro

ble

ms

Sym

pto

mC

ause

sC

hec

ksM

easu

res

Rem

arks

Bad

coo

ling.

Fre

ezer

C

ompr

esso

r do

esC

ompr

esso

r Le

ad W

ireC

heck

com

pres

sor

Lead

Wire

R

econ

nect

Lea

d

tem

pera

ture

isno

t sta

rt.

is c

ut.

with

a te

ster

.W

ire.

high

.D

efec

tive

com

pres

sor

Mea

sure

vol

tage

at P

CB

CO

N2

Rep

lace

rel

ay R

Y1

Ref

er to

load

driv

ing

rela

y.(3

&9)

afte

r pr

essi

ng m

ain

PC

Ban

d R

Y2

or P

CB

.dr

ivin

g ci

rcui

t in

test

sw

itch

once

. It i

s O

K if

ci

rcui

t

volta

ge is

nor

mal

.ex

plan

atio

n.

Def

ectiv

e fr

eeze

r D

efec

tive

Fre

ezer

C

heck

res

ista

nce

of fr

eeze

r R

epla

ce fr

eeze

r R

efer

to

sens

or.

sens

or p

arts

.se

nsor

with

a te

ster

.se

nsor

.re

sist

ance

char

acte

ristic

s

tabl

e of

sen

sor

in

circ

uit.

Ref

er to

tabl

es o

n pa

ges

40, 4

1, a

nd 4

3.

The

wro

ng s

enso

rC

onfir

m th

e co

lor

of s

enso

r in

R

epai

r m

ain

PC

Bex

plan

atio

n.

has

been

inst

alle

d.ci

rcui

ts (

mai

n P

CB

sen

sor

sens

or h

ousi

ng

Ord

er b

y m

odel

num

ber

hous

ing)

.

and

part

num

ber.

Def

ectiv

e fr

eeze

r fa

nF

an m

otor

lead

wire

C

heck

fan

mot

or le

ad w

ire

Rec

onne

ct le

ad

mot

or.

is c

ut.

with

a te

ster

.w

ire.

• D

efec

tive

door

sw

itch

Mea

sure

the

volta

ge b

etw

een

• R

epla

ce d

oor

Ref

er to

load

(fre

ezer

, ref

riger

ator

,P

CB

pow

er b

lue

line

and

fan

switc

h (f

reez

er,

driv

ing

circ

uits

in

hom

e ba

r).

mot

or a

fter

pres

sing

test

sw

itch

refr

iger

ator

, and

ci

rcui

t

• D

efec

tive

fan

mot

or.

of M

ain

PC

B. I

f the

vol

tage

is

hom

e ba

r).

expl

anat

ion.

• D

efec

tive

fan

mot

orno

rmal

, it i

s O

K.

• R

epla

ce fa

n m

otor

.

driv

ing

rela

y.•

Rep

lace

rel

ay R

Y5

& R

Y6

or P

CB

.

Fau

lty d

efro

st.

Ref

er to

faul

ty d

efro

st it

ems

in tr

oubl

e di

agno

sis

Ref

er to

trou

ble

func

tions

.di

agno

sis

func

tion.

TROUBLE DIAGNOSIS

- 87 -

Pro

ble

ms

Sym

pto

mC

ause

sC

hec

ksM

easu

res

Rem

arks

Bad

coo

ling

Wro

ng

Def

ectiv

e S

tep

Mot

or

Che

ck S

tep

Mot

or

Che

ck if

Ste

p M

otor

dam

per

Rec

onne

ct le

ad

Ref

riger

ator

Dam

per.

dam

per

mot

or a

nd

mot

or a

nd r

eed

switc

h le

ad

wire

.

tem

pera

ture

.re

ed s

witc

h an

d le

ad

wire

are

cut

with

a te

ster

.

wire

are

cut

. Che

ck

Ref

er to

Ste

p M

otor

dam

per

Rep

lace

Ste

p M

otor

Ste

p M

otor

dam

per

in p

arts

rep

air

guid

e.da

mpe

r or r

efrig

erat

or

part

.co

ntro

l box

Ass

embl

y.

Che

ck S

tep

Mot

or

Ref

er to

Ste

p M

otor

dam

per

Rep

lace

rel

ay o

r R

efer

to s

ingl

e

dam

per

Mot

or d

rivin

g in

par

ts r

epai

r gu

ide.

PC

B.

mot

or d

ampe

r

rela

y in

PC

B.

driv

ing

circ

uits

in c

ircui

t

expl

anat

ion.

For

eign

mat

eria

ls in

Ste

p C

heck

Ste

p M

otor

dam

per

Rem

ove

fore

ign

Mot

or d

ampe

r ba

ffles

.ba

ffle

visu

ally

.m

ater

ials

.

Ice

form

atio

n on

C

heck

if S

tep

Mot

or d

ampe

r R

epla

ce S

tep

Mot

or

Ste

p M

otor

dam

per

Hea

ter

wire

is c

ut w

ith a

da

mpe

r or

ref

riger

ator

baffl

es.

test

er.

cont

rol B

ox A

ssem

bly.

Def

ectiv

e re

frig

erat

orD

efec

tive

refr

iger

ator

Che

ck th

e re

sist

ance

of

Rep

lace

ref

riger

ator

Ref

er to

sen

sor

sens

orse

nsor

par

ts.

refr

iger

ator

sen

sor

with

a te

ster

.se

nsor

.re

sist

ance

char

acte

ristic

tabl

e in

circ

uit

expl

anat

ion.

Ref

riger

ator

sen

sor

isC

heck

the

sens

or c

olor

in th

e R

epai

r m

ain

PC

B

subs

titut

ed fo

r ot

her

circ

uit.

(mai

n P

CB

sen

sor

sens

or h

ousi

ng.

sens

or.

hous

ing.

)

Def

ectiv

e re

frig

erat

orC

heck

if r

efrig

erat

or s

enso

rF

ix a

gain

the

sens

or a

ssem

bly

is n

ot fi

xed

at c

over

sen

sor

but

refr

iger

ator

sen

sor.

cond

ition

.in

ner

case

vis

ually

.

TROUBLE DIAGNOSIS

- 88 -

Pro

ble

ms

Sym

pto

mC

ause

sC

hec

ksM

easu

res

Rem

arks

Bad

def

rost

.D

efro

st is

not

Def

rost

lead

wire

is c

ut.

Che

ck if

def

rost

lead

wire

is c

ut w

ith a

R

econ

nect

Lea

d

wor

king

.te

ster

.W

ire.

Def

ectiv

e de

fros

t driv

ing

rela

y.C

heck

the

volta

ge o

f CO

N2

(1 a

nd 7

) R

epla

ce r

elay

(R

Y 7

Ref

er to

load

with

a te

ster

afte

r pr

essi

ng m

ain

and

RY

3)

or P

CB

.dr

ivin

g co

nditi

ons

PC

B te

st s

witc

h tw

ice.

ch

eck

in c

ircui

t

If th

e vo

ltage

is n

orm

al th

en it

is O

K.

expl

anat

ion.

Def

ectiv

e de

fros

t sen

sor

part

s.C

heck

the

resi

stan

ce o

f def

rost

sen

sor

Rep

lace

def

rost

R

efer

to s

enso

r

with

a te

ster

.se

nsor

.re

sist

ance

char

acte

ristic

tabl

e of

circ

uit

expl

anat

ion.

Def

ectiv

e B

uzze

r D

efec

tive

conn

ectin

g le

ad w

ire fr

om

Che

ck le

ad w

ire r

elat

ed to

doo

r R

epai

r le

ad w

ire.

buzz

erco

ntin

uous

lym

ain

PC

B to

doo

r sw

itch.

switc

h w

ith a

test

er.

rings

or

door

Def

ectiv

e do

or s

witc

h pa

rts.

Ref

er to

doo

r sw

itch

in p

arts

rep

air

Rep

lace

doo

r sw

itch.

open

ing

alar

m

guid

e.

does

not

wor

k.

Def

ectiv

e B

uzze

r do

es

Key

inpu

t wire

is c

ut o

r ba

d co

nnec

tor

Che

ck in

put w

ire w

ith a

test

er.

Rec

onne

ct le

ad

Ref

er to

dis

play

disp

lay

butto

nno

t sou

nd

term

inal

con

tact

in m

ain

PC

B a

nd

wire

and

rep

lace

or

circ

uit i

n ci

rcui

t

and

butto

nsdi

spla

y P

CB

con

nect

ing

lead

wire

.di

rect

ly c

onne

ct b

adex

plan

atio

n.

do n

otco

ntac

t ter

min

al to

oper

ate.

le

ad w

ire.

Key

is c

ontin

uous

ly d

epre

ssed

due

to

Dis

asse

mbl

e fr

ame

disp

lay

and

conf

irm

Adj

ust o

r re

plac

e

stru

ctur

al in

terf

eren

ce.

visu

ally

.in

terf

erin

g

stru

ctur

es.

TROUBLE DIAGNOSIS

- 89 -

Pro

ble

ms

Sym

pto

mC

ause

sC

hec

ksM

easu

res

Rem

arks

Def

ectiv

eB

uzze

r do

es

Tro

uble

mod

e in

dica

tion.

Che

ck tr

oubl

e di

agno

sis

func

tion.

Rep

air

trou

bles

Ref

er to

mod

e

disp

lay

butto

n.no

t sou

nd

indi

catio

n in

and

butto

nsfu

nctio

n

do n

ot o

pera

te.

expl

anat

ions

.

Doo

r B

uzze

rB

uzze

r D

efec

tive

conn

ectin

g le

ad w

ire fr

om

Che

ck le

ad w

ire a

ssoc

iate

d w

ith d

oor

Rep

air

lead

wire

.C

heck

mod

el

cont

inuo

usly

mai

n P

CB

to d

oor

switc

h.sw

itch.

with

dis

pens

er.

rings

or

door

Def

ectiv

e fr

eeze

r co

mpa

rtm

ent d

oor

Ref

er to

doo

r sw

itch

in p

arts

rep

air

Rep

lace

Fre

ezer

open

ing

alar

msw

itch

part

s.gu

ide.

com

part

men

t doo

r

does

not

wor

k.sw

itch.

Bad

wat

er/ic

eIc

e an

d w

ater

Def

ectiv

e co

nnec

ting

lead

wire

from

C

heck

Lea

d W

ire a

ssoc

iate

d w

ith le

ver

Rep

air

lead

wire

.

disp

ense

r.ar

e no

tM

ain

PC

B to

leve

r sw

itch.

switc

h w

ith a

test

er.

disp

ense

d.D

efec

tive

leve

r sw

itch

part

sR

efer

to d

oor

switc

h in

par

ts r

epai

r gu

ide.

Rep

lace

leve

r sw

itch.

Def

ectiv

e ph

oto

coup

ler

IC p

arts

.C

heck

vol

tage

cha

nge

at p

hoto

cou

pler

Rep

lace

pho

to

outp

ut te

rmin

als

with

leve

r sw

itch

coup

ler

IC o

r P

CB

.

pres

sed.

It is

OK

if v

olta

ge c

hang

e is

betw

een

0V

- 5

V.

Def

ectiv

e re

lay

asso

ciat

ed w

ith ic

e C

heck

rel

ay (

RY

4, R

Y5,

RY

12)

Rep

lace

def

ectiv

e

disp

ense

(ge

ared

mot

or, c

ube,

and

with

a te

ster

.re

lay.

disp

ense

r so

leno

id).

Def

ectiv

e pa

rts

asso

ciat

ed w

ith ic

e C

heck

res

ista

nce

of p

arts

with

a te

ster

.R

epla

ce d

efec

tive

disp

ense

(ge

ared

mot

or, c

ube,

and

part

s.

disp

ense

r so

leno

id).

Def

ectiv

e re

lay

asso

ciat

ed w

ith w

ater

Che

ck r

elay

(R

Y7)

with

a te

ster

Rep

lace

def

ectiv

e

disp

ense

.re

lay.

Def

ectiv

e pa

rts

asso

ciat

ed w

ith w

ater

Che

ck r

esis

tanc

e of

par

ts w

ith a

test

er.

Rep

lace

def

ectiv

e

disp

ense

r.pa

rts.

Cooling Cycle Heavy Repair

1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant

TROUBLE DIAGNOSIS

- 90 -

NO. Items Unit Standards Purposes Remarks1 Pipe and piping Min. Pipe:within 1 hour. To protect The opening time should be reduced to a

system opening time. Comp:within Moisture half of the standards during rain and 10 minutes. Penetration. rainy seasons (the penetration of water

Drier:within into the pipe is dangerous).20 minutes.

2 Welding. Nitrogen Weld under To protect - Refer to repair note in each part.Pressure. Nitrogen oxide scale - R134a refrigerant is more susceptible to

atmosphere formation. leaks than R12 and requires more care(N2 pressure: during welding.0.1~0.2 kg/cm2) - Do not apply force to pipes before and

after welding to protect pipe from cracking.

3 N2 sealed parts. Confirm N2 Confirm air leaking To protect - In case of evaporator parts, if it doesn't leak. sounds when moisture make noise when removing bushing

removing bushing penetration. cap blow dry air or N2 gas for more than cap. 1 min use the parts.Sound:usableNo sound:not usable

4 Refrigeration Evacuation Min. More than To removeCycle. time 40 minutes. moisture.

Vacuum Torr Below 0.03(ref) Note:Only applicable to the model degree equipped with reverse flow protect

plate.Vacuum EA High and low Vacuum efficiency can be improved by

Pressure sides are operating compressor during evacuation.evacuated at thesame time formodels above 200L

Vacuum EA Use R134a To protect The bushing pipes for R12 refrigerant shall piping exclusive mixing of be melted when they are used for R134a

manifold. mineral and refrigerant causes of leak.ester oils.

Pipe EA Use R134a To protectcoupler cxclusive. R12 Refri-

gerant mixing.Outlet R134a exclusive. ˝

(Socket)Plug R134a exclusive ˝

5 Refrigerant weighing. EA Use R134a Do not mix - Do not weigh the refrigerant at too hot or exclusively. with R12 too cold an area. (25°C[77°F] is adequate.)Weighing refrigerant. - Use copper charging canister allowance:±5g Socket:2SV Plug: 2PV R134aNote:Winter:-5g Note : Do not burn O-ring (rubber) during

Summer:+5g welding.

6 Drier replacement. -Use R134a exclusively To removefor R134a refrigerator the moisture-Replace drier whenever from pipe.repairing refrigeratorcycle piping.

7 Leak check. -Do not use soapy Detect -Check oil leak at refrigerant leak area. water for check. refrigerant Use electronic leak detector if oil leak is It may be sucked leak area. not found.into the pipe. -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.

2. Summary Of Heavy Repair

TROUBLE DIAGNOSIS

- 91 -

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, N2 gas

- Confirm N2 sealing and packing conditions before use.

Use good one for welding and assembly.

- Weld under nitrogen gas atmosphere. (N2 gas pressure:

0.1-0.2kg/cm2).

- 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:113 liters/minute.

- Weigh and control the allowance of R134a charging R134a exclusive charging canister

canister in a vacuum conditions to be ±5 g with (mass cylinder), refrigerant

electronic scales and charge through compressor inlet R134a manifold gauge,

(Charge while compressor operates). electronic scales, pinch-off

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

- Check leak 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 (2 inches) from the wall for compressor

compartment cooling fan mounted model.

Troublediagnosis

Remove refrigerantResiduals

Partsreplacementand welding

Compressorcompartment

and toolsarrangement

Transportationand

installation

Checkrefrigerant leak

and coolingcapacity

Vacuum

Refrigerantcharging and

charginginlet welding

3. Precautions During Heavy Repair

TROUBLE DIAGNOSIS

- 92 -

Items Precautions

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

2. Recovery of refrigerant. 1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off.

2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate

recovery equipment to recover the refrigerant from the system. When the refrigerant has

been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT

TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT.

The use of piercing type valves will allow future servicing and eliminates the possibility of a

defective pinch off.

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

4. Nitrogen blowing 1) Use pressurized nitrogen to prevent oxidation inside the piping.

welding. (Nitrogen pressure : 0.1~0.2 kg/cm2.)

5. Others. 1) Only nitrogen or R134a should be used when cleaning the inside of piping of the sealed

system.

2) Check leakage with an electronic leakage tester.

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

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

1

2

Compressor

Low pressure side CondenserHigh pressure side

Drier

Evaporator

Hot Line

4. Practical Work For Heavy Repair

TROUBLE DIAGNOSIS

- 93 -

Items Precautions

1. Removal of residual

refrigerant.

1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off.

2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate

recovery equipment to recover the refrigerant from the system. When the refrigerant has

been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT

TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT.

The use of piercing type valves will allow future servicing and eliminates the possibility of a

defective pinch off.

2. Nitrogen blowing

welding.

When replacing a drier:

Weld and parts by blowing nitrogen (0.1~0.2kg/cm2) 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 it does not produce oxidized

scales inside pipe because of its short welding time.

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

KEY POINTObserve the sequence forremoval of refrigerant.(If not, compressor oil mayleak.)

KEY POINTWelding without nitrogenblowing produces oxidizedscales inside a pipe, whichaffect performance andreliability of a product.

KEY POINTBe sure to check theinserted length of capillarytube when it is inserted. (If inserted too far, thecapillary tube will beblocked by the filter.)

Compressor

Low pressure side

CondenserHigh pressure side

Drier

Evaporator

ReleaseRefrigentIntake

Suction

Hot Line

1 2 1

2

Evaporator

Drier

High pressure sideCondenserRefrigent

Intake

Hot Line

12+3-0

Filter

* Unit : mm

TROUBLE DIAGNOSIS

- 94 -

Items Precautions

4. Vacuum degassing.

Pipe Connection

Connect the red hose to the high pressure side and the 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 charging canister 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 charging canister by subtracting the weight of an

evacuated charging canister.

KEY POINT- If power is applied

during vacuumdegassing, vacuumdegassing shall bemore effective.

- Run the compressorwhile charging thesystem. It is easierand works better.

KEY POINT- Be sure to charge therefrigerant at around25°C [77°F].

- Be sure to keep -5g inthe winer and +5g insummer.

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

Calculation of amount of refrigerant charged

2 1

3

Compressor

Lowpressure

Condenser

Highpressure

Drier

Evaporator

RedYellow

Blue

VacuumPump

Suction pipe

Hot Line

R134a

Indicate the weight of an evacuated charging canister

5. Standard Regulations For Heavy Repair

TROUBLE DIAGNOSIS

- 95 -

Items Precautions

4) Refrigerant Charging

Charge refrigerant while operating a compressor as shown above.

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

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

on the welded parts.

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

7. Pipe arrangement When replacing components, be sure

in each cycle each pipe is replaced in its original

position before closing the cover of the

mechanical area.

Compressor

Condenser

Drier

Hot Line

Evaporator

Charging Canister

Bushing

1) Observe the safety precautions for gas handling.

2) Use JIG (or a wet towel) in order to prevent electric wires from burning during welding. (In order to prevent insulationbreak and accident.)

3) The inner case will melt and the insulation will burn.

4) The copper piping will oxidize.

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 distorted while cutting a capillary tube.

8) Be sure that the suction pipe and the filling tube should not be substituted each other during welding. (High efficiencypump.)

12 mm+3-0

DrierMolecular PipeMolecular

Sieves

+3-0

6. Brazing Reference Drawings

TROUBLE DIAGNOSIS

- 96 -

PIPE ASSEMBLY, JOINT

PIPE ASSEMBLY, HOT LINE

(Freezer)

PIPE ASSEMBLY,

JOINTCONDENSER ASSEMBLY, WIRE

PIPE ASSEMBLY, SUCTION

DRIER ASSEMBLYCAPI - TUBE

Copper BrazerCopper

Brazer

Silver Brazer

Copper

Brazer

Copper BrazerCopper Brazer Coppper Brazer

Silver Brazer

Copper

Brazer

HOW TO DEAL WITH CLAIMS

1. Sound

TROUBLE DIAGNOSIS

- 97 -

Problems Checks and Measures

Hiss sounds Explain general principles of sounds.• All refrigerators make noises when they run.

The compressor and fan produce sounds.There is a fan in the freezer compartment which blows cool air to freezer andrefrigerator compartments. Hiss sounds are heard when the air passes throughthe 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, theair circulation sounds may be noticeable.

Noise of Compressor.• This operating sound happens when the compressor compresses the

refrigerant. The compressor rotates at 3600 RPM. The sound of compressorlarge refrigerators make more noise than small ones

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 therefrigerator 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 3600 RPM. This sound is caused by the vibration of motor and piston whenthey start and finish their operation. This phenomenon can be compared withthat of cars. When an automobile engine starts, it is loud at first but quiets down quickly. When the engine stops, so does the vibration.

Vibration sound Check the sound whether it comes from the pipes vibration and friction.• Insert bushing or leave a space between pipes to avoid the noise.• Fix the fan blade if it is hitting on the shroud• Fix the drip tray if it is loosened.

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 level of the refrigerator.

TROUBLE DIAGNOSIS

- 98 -


Sounds of water flowing Explain the flow of refrigerant.• When the refrigerator stops, the water flowing sound happens.

This sound happens when the liquid or vapor refrigerant flows from theevaporator to 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 turned 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

- Noise from motor sounds Hiss. freezes, clicking sounds are heard. When ice is being ejected, sounds like Hissproduced by a motor to rotate an ice tray and ice dropping and hitting ice binsounds 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 watertank in the lower part of the refrigerator compartment. The water is dispensedby this pressure. When this happens, motor sound and water flowing sound areheard.

Noise when supplying ice. Explain the principles of ice supply and procedure of crushed icemaking in adispenser.• When ice cube button is pressed, ice stored in the ice bin is moved by an auger

and dispensed. If crushed ice button is pressed, the ice cube is crushed. When this happens, ice crushing and hitting ice bin sounds are heard.

2. Measures for Symptoms on Temperature

TROUBLE DIAGNOSIS

- 99 -


Refrigeration is weak. Check temperature set in 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 their habit and taste.If you feel the refrigeration is weak, then set the temperature control button atstrong position. If you adjust the button in 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 period or freezing food, use a freezer compartment. It is normal thatfrozen 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, move it to a refrigerator 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

at strong position.

Refrigeration is too strong. Check the position of temperature control button.• 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 atweak. If it is strong only near the outlet of cool air, keep food (especially dampfoods and easily frozen foods) 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 at weak if they arealso 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 at MID. Do not store food near the outlet of the cooling air as it block the air circulation.

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

3. Odor and Frost

TROUBLE DIAGNOSIS

- 100 -


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 the completely sealedrefrigerator compartment. The deodorizer can absorb some portions of the odorbut not completely. The intensity of odor depends on refrigerator conditions andenvironments.

Check the temperature control button and set at 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 thetemperature control button at strong.

Frost in the freezer compartment Explain the basic principles of frost formation.• The main causes for frosting:

- Door was 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 therefrigerator, fine frost forms as cold air mixes with hot air. If this happens quiteoften, much frost forms inside of the refrigerator. If the door is left open inSummer, 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 (protrudedpart) of ice mold will freeze and form frost. If warm water was put into the icemold, the situation will become worse.

4. Others

TROUBLE DIAGNOSIS

- 101 -


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 preventcondensation formation. Particularly in summer or after installation ofrefrigerator, it may feel hot but it is normal. If there is not enough space todissipate heat, it can be hotter due to lack of heat radiation. Please install arefrigerator in a well-ventilated place and leave the clearance betweenrefrigerator 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 releasing hole, forming can be easily done .

Electric bills are too much. Explain that the hole is to allow the air to escape when vacuum forming plasticparts and pumping foam insulation into cavities. NOTE! Holes and releasing gas appear to be very crude and would not be

acceptable in a manual.There are small holes in the plastic liner of some parts of the refrigerator. These holes allow plastic parts to be injection molded and vacuum formed by allowing air bubbles to be expelled. They also allow foam insulation to be pumped into cavities where air bubbles may build up.

Condensation on the inside Explain how to store foodswall 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 orproperly vegetable drawer. wrapped. Be sure to store wet foods in airtight containers or securely covered in

plastic wrap.

When is the power connected? When should the power be connected ?• You can connect the power immediately after installation. However, if the

refrigerator was laid flat before or during installation, you must stand it uprightfor 6 hours before plugging it in. This allows the refrigerant oils to return to thesump in the compressor. If you operate the refrigerator before the oil has had achance to settle, you could damage the compressor.

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 increase theinternal pressure when door is closed. This causes the door sticked closely tothe refrigerator in a moment. (If the refrigerator is used for a long time, it willopen smoothly.)

When the refrigerator compartment door is opened and closed, the freezercompartment door moves up and down.• When the refrigerator compartment door is opened and 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 so it closes securely without a gap. It can be

held open easily if something is in the way and obstructs the door’s closing.

A door does not close properly. • If the refrigerator is not properly leveled, the doors will not close easily. Adjust

the level using the leveling screws under the front of the refrigerator.

The front side shouldbe a little bit higherthan the rear side.

TROUBLE DIAGNOSIS

- 102 -

1. DOOR

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

• Pull the water supply tube forward while pressing onthe coupling as shown in the drawing.

w Disconnecting the tube under the door causes about1.5 litters water to flow out. Please put up a bigcontainer to prevent it.

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 isloosened and take it out in arrow B direction.

Note : • When disconnecting refrigerator door, turn hingelever counterclockwise.

• If the hinge or bracket are bent during assembly,use two extra screws (Tap Tite M6, Left Hingeattaching screw) in the holes of the upper hinge.

(3) Disconnect upper hinge from the hinge supporter by grasping the front part of upper hinge and lifting up(Hinge Assembly, U) in arrow direction A and pullforward in arrow B direction. Be careful because thedoor may fall, damaging the door, the floor, or injuringyou.

(4) Lift up the freezer door in arrow direction anddisconnect the door from the lower hinge . Don’t pullthe door forward.

Note : • Lift up the freezer door until a water supply tube isfully taken out.

(5) Assembly is the reverse order of disassembly

HOW TO DISASSEMBLE AND ASSEMBLE

- 103 -

2

1A A B

1

2

1

2

2Connecting

Line

EarthingCord

Hinge Cover

Hinge Lever

A

B

2. HANDLE

1. Aluminum Handle Model1) Use a small screwdriver blade in the groove at the side

of the Deco Handle to lift and separate the cover. Twistdown in the direction of arrow and lift the cover in thedirection of arrow .

2) Use a small screwdriver blade in the groove at the sideof the Deco Handle to lift and separate the cover. Twistdown in the direction of arrow and lift the cover in thedirection of arrow .

3) Push the handle piece in the direction of the arrowand disconnect it.

4) Turn screw in arrow direction with a philips driver anddisconnect.

2. Plastic handle Model1) Use a small screwdriver blade in the groove at the side of

the Deco Handle to push it down slightly and separate thecover. Push down in the direction of arrow and pushthe cover down in the direction of arrow .

2) Turn screw in arrow direction with a cross driver andlift up a little bit in arrow and pull it up in arrow .


- 104 -

1

Deco Handle

2

3

4

1

2

Screw

1

2

3

Handle Piece

Screw

3. Fan Shroud Grille1) Loosen two screws after disconnecting a cap screw of a

grille fan (U) with a screwdriver balde.

2) Disassembly of a grille fan (U) : Pull forward afteropening hook at part with a screwdriver blade.

3) Disconnect housing A of a grille fan (L) from the mainbody.

4) Disassembly of a grille fan (L) : Hold upper part of agrille fan (L) and pull forward carefully.

5) Loosen two screws.

6) Disassembly of shroud. F (U) : Disconnect housing of Bafter removing two rail guides with a screwdriver blade.

7) Disassembly of shroud. F (U) : Hold upper part and pullforward.

8) Check foam sticking conditions around a shroud, F (U)and F (L) during assembling. If damaged, torn, or badlystuck, assemble with a new one after sealing well.

4. ICEMAKER ASSEMBLY

1. Dispenser Model1) How to disassemble:

(1) Remove ice bin and shelf from the freezercompartment.

(2) Loosen four screws under part of icemaker.

(3) Disconnect icemaker housing.

(4) Loosen a screw on the bracket and lift up the Icemaker.

2) How to assemble:The assembly is the reverse order ofthe above disassembly.

Note : When the ice tray is not horizontal after assembly,assembly must be wrong. Check and assembleagain.


- 105 -

5. DISPENSER1) Disconnect funnel and button assembly by pulling down

and forward.

2) Remove display frame Assembly by making a gapbetween a display frame Assembly and funnelAssembly. with a balde screwdriver and pulling itforward. The cover dispenser is attached with a hook.

3) The Display Assembly can be connected by pressingthe top of the dispenser cover and pushing it afterseparating the Display Frame from its housing.

4) Loosen four screws with a phillips screwdriver and pullthe funnel Assembly to disconnect.

5) The Duct Cap Assembly can be disconnected if the holdlever connecting screw is loosened with a phillips driver.

6) To install the Duct Cap Assembly, insert one end of thespring into the right hole of the dispenser lever andinsert the other end into the right hole in the top part ofthe dispenser. Then attach the holder at the solenoidswitch.


- 106 -

Button

Funnel Assembly

Funnel

Assembly

HolderLever

Solenoid Assembly

Cap Assembly,Duct

Spring

Sheet Heater

Dispenser Lever

Solenoid Assembly

1. SAFETY PRECAUTIONS

1-1. Warning1. Be sure to make a safety check, if circuit is found,

components that appear to have overheated or areotherwise damaged should be replaced with newcomponents.

2. After servicing, be sure that the protected equipment isassembled.

3. When you don’t watch TV, use the POWER button turn itoff.

1-2. Notes1. When inserting the instrument or circuit board, fix the

leads to the jack, before soldering.

2. Insert higher voltage resistors with a 10mm gap abovethe PWB.

3. Don’t touch hot chassis leads.

2. FEATURE

2-1. Auto Program tuningAll stations that can be received are stored.

2-2. Auto SleepTV will automatically switch itself to standby modeapproximately ten minutes after TV station stopsbroadcasting.

2-3. Auto Search (FM RADIO)Press the TV/RADIO button and then hold CH or CH

button for more than 1 second to select RADIO Menu.

TV-RADIO

- 107 -

3. CONTROLS

TV-RADIO

- 108 -

MENU ENTER VOL TV/RADIO POWERCHA/TUN

MENU/PRESET ENTER/MEMORY VOLUME TV/RADIO POWERCH/TUNE

Menu/Preset Button

Enter/Memory Button TV/Radio Button

Remote Control Sensor

Power/Standby IndicatorGlows red in Standby mode,

Glows green when the TV is turned on.

Channel/Tune Button Volume Button

Power Button Antenna Jack

MHz

4. REMOTE CONTROL KEY FUNCTIONS

- When using the remote control, aim it at the remote control sensor on the TV.

TV-RADIO

- 109 -

powertv/radio

mute mts

fcr

ch

ch

volentermem

1 2 3

4 5 6

7 8 9

0

vol

exit menu

preset

dasp

flashbkcc sleep

apc

MUTESwitches the sound on or off.

ENTER/MEM

CH / (Channel button)

VOL / (Volume button)

POWER

MTS

EXIT

MENUPRESET

APC

SLEEP

FLASHBKPress the FLASHBK button to

Lets you select the amount of time beforeyour TV turns itself off automatically.

Adjusts the factory preset pictureaccording to the room.

Activates the on-screen menu, togglesthrough the menus, and toggles throughpreset radio station.

Selects MTS sound: Mono, Stereo, or SAP.

return to the last channel you werewatching.

• Open the battery compartment cover on the back side and insert the batteries with correct polarity.

• Install two 1.5V batteries of AAA type. Don't mix used batteries with new batteries.

DASP

CC

TV/RADIOSelects: TV or Radio.

FCR

NUMBER buttons

Installing Batteries

Use to scroll the Favorite channel list.

Selects the sound appropriate for the program's character.

Select a closed caption:Off, EZ Mute, or On.

5. TROUBLESHOOTING

5-1. General

5-2. TV

5-3. FM Radio

TV-RADIO

- 110 -

No. Poor Symptoms Adjustment

1

2

No Picture

Poor Picture

1) No P1, P51, P52, P53, P54 connector

2) Poor TV Main PCB

1) Poor LCD Lamp

2) LCD Connector

1) Check P1 connector and switched on

2) Change the TV Main PCB

1) Change the LCD

2) Check connector and switched on


1

2

No Sound

Poor Display LCD

1) Poor FM Radio Tuner

1) Poor Text Display

2) No Backlight

1) Charge FM Radio Tuner.

1, 2) Charge FM Radio LCD ASSEMBLY

& Check Connector


1

2

3

4

5

No Sound

Poor Radiant heat

Fan

No TV broadcast

Button does not

work

Remote Control

does not work

1) No P601, P602 connector

2) Poor speaker

3) Poor TV Main PCB

1) Fan turning abrades wire and tape.

2) Poor Fan

1) No TV connection

(Hinge Cover, Back TV)

1) No P101 connector

2) Poor switch

1) No P101 connector

2) Poor Remote Control sensor

3) Poor Remote Control


2) Change the speaker

3) Change the TV Main PCB

1) Detach Fan and remove the

interference.

2) Change the Fan

1) Check connection and switch on

1) Check connector and switch on

2) Change the Button PCB


2) Change the Button PCB

3) Change the Remote Control

6. BLOCK DIAGRAM

TV-RADIO

- 111 -

7. TV PART DISASSEMBLE

TV-RADIO

- 112 -

Place tape on the outer edge of the TV case toprotect the soft plastic from damage (2 or 3 layers isrecommended).

❶

Using a flat bladed screwdriver, carefully pry the trimloose from the frame.

❷

Carefully remove the trim.

❸

Remove two phillips head screws located at the topof the TV.

❹

Tip the TV forward and disconnect all wires.

❺

Carefully remove the TV.

❻

DISPENSER RELATED PARTS

EXPLODED VIEWS

- 113 -

1821

19

7

8

11

14

17 15

16

277A

9

10

2325

22

4

1

2

24

11

1 FRAME ASSEMBLY, DISPLAY

2 DISPENSER COVER

4 PWB(PCB) ASSEMBLY, DISPLAY

7 FUNNEL ASSEMBLY

8 MICRO SWITCH

9 FUNNEL FRAME

10 LEVER(SWITCH)

11 FUNNEL

12 FUNNEL GUIDE

13 ROCKER SWITCH

14 SOLENOID ASSEMBLY

15 SPRING

16 LEVER HOLDER

17 DUCT CAP

19 DISPENSER LEVER

20 BUSHNIG CAP

21 BUTTON ASSEMBLY

22 BUTTON

23 BUTTON HOLDER

24 DRAIN GRILLE

17 Cap Assembly, Duct Detailed Drawings

FREEZER DOOR PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT

* : Optional part

EXPLODED VIEWS

- 114 -

202A

200A

210A

203A201A

210B

210C

205F

205B

205E

205A

205C

205D

210B*

*

REFRIGERATOR DOOR PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**

* : Optional part

EXPLODED VIEWS

- 115 -

240A

232A

240C

233A

230A

239A

231A

241B

241C

241A

205F

205B

205E

205A

205C

205D

243A

242D

147A

147B

147C*

242C

242A

242B

242D

242C

242A

242B

*

REFRIGERATOR DOOR PART: LRSC26980TT

* : Optional part

EXPLODED VIEWS

- 116 -

240A

232A

240C

233A

230A

239A

231A

241B

241C

241A

243A

240A

242D

147A

147B

147C*

242C

242A

242B

205F

205B

205E

205A

205C

205D

260B

238A

FREEZER COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**,LRSC26980TT

* : Optional part

EXPLODED VIEWS

- 117 -

271B271A

103A

400A

312A

152A

128C*

128D*

128D

128F

128H

128C

128E

128G

403C139B

105B

272A

135B

137A

136D

329A

135A136B403A

136C

401A

408A

302B

130A

126A

125A

121A

120C

403D

127B

120B

270A

402A

*

*

*

*

*

*

*

*

*

*

*

*

270C

REFRIGERATOR COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**

* : Optional part

EXPLODED VIEWS

- 118 -

271B

271C

145A

145A

103A

152A

152A

177A

170A

166B

166A

165A

272B

155A

146A

146B*

177B

166B

150B

409B

116A

401A

115A

150A

168A

120E

162A

162B

142D

142A

270D

402A

270B

151A

171B

171A

141C

141B

140A

140C

140B

142C

142B

624D

624B

624C

624A

504A

167A

167B

167C

*

*

**

*

*

*

*

*

141A

REFRIGERATOR COMPARTMENT: LRSC26980TT

* : Optional part

EXPLODED VIEWS

- 119 -

271B

271C

145A

145A

103A

152A

152A

177A

170A

166B

166A

165A

272B

155A

146A

146B*

177B

166B

150B

409B

116A

401A

115A

150A

168A

120E

162A

162B

142D

142A

151A

171B

171A

141C

141B

140A

140C

140B

142C

142B

624D

624B

624C

624A

504A

167A

167B

167C

*

*

**

*

*

*

*

*

141A

270D

207B

402A

270B

ICE & WATER PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT

* : Optional part

EXPLODED VIEWS

- 120 -

614A

613A

600B

606A

610A

621B

600A

612A

612B

612C

616E

618A

616D

404A

625A

616G

621C

616F

611B

611A

611C

611D

404B

627A

619A

MACHINE COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**,LRSC26980TT

* : Optional part

EXPLODED VIEWS

- 121 -

300A310B

307A

304A

306A

310A

317B

317A

305C 305B

313A

301A

307A

104A

305C

305B

303C

303B

303D

303A

305A

500A

502B

411A

101B

101A

308A308C

308B

309B

403B

309C

309A

502A

410G

410H

DISPENSER PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT

* : Optional part

EXPLODED VIEWS

- 122 -

278A

402C

405A

275A 276A

275C

275B

401C

275D

276B

277A

278B

278C

280C280G

280B

501A*

279D

279A

279B

279C

280E

280D

279E

278F

281A

280F

278G

FREEZER DOOR PART: LRSC26910**, LRSC26911**

EXPLODED VIEWS

- 123 -

202A

200A

210A

203A201A

210C

210C

210C

205C

205A

205E

REFRIGERATOR DOOR PART: LRSC26910**, LRSC26911**

EXPLODED VIEWS

- 124 -

240A

232A

240C

147A

233A

230A

239A

231A

241B

241C

241A

243A

240A

243A

240A

205D

205B

205E

FREEZER COMPARTMENT: LRSC26910**, LRSC26911**

EXPLODED VIEWS

- 125 -

271B

270C

271A

103A

400A

312A

152A

128C*

128D*

128D

128F

128C

128E

105B

272A

135B

137A

136D

329A

135A136B403A

136C

401A

408A

302B

130A

126A*

*

*

125A

120C

120B

120B

270A

402A

REFRIGERATOR COMPARTMENT: LRSC26910**, LRSC26911**

EXPLODED VIEWS

- 126 -

166B

160A

271B

271C

145A

145A

103A

152A

177A

170A

166B

166A

165A

272B

155A*

177B

166B

150B

409B

116A

401A*

115A

150A

140C

140D140A

140C

140D140A

162A

162B

270D

402A

270B

151A

141A

171B

171A

141C

141B

624D

624B

624C

624A

ICE & WATER PART: LRSC26910**, LRSC26911**

EXPLODED VIEWS

- 127 -

614A

613A

600B

606A

610A

621B

600A

612A

612B

612C

616E

618A

616D

404A

625A

616G

621C

616F

611B

611A

611C

611D

404B

627A

619A

MECHANICAL COMPARTMENT: LRSC26910**, LRSC26911**

EXPLODED VIEWS

- 128 -

300A310B

307A

304A

306A

310A

317B

317A

305C 305B

313A

301A

306C

307A

104A

305C

305B

303C

303B

303D

303A

305A

308A308C

308B

309B

403B

309C

309A

500A

502B

411A

502A

410G

410H

101B

101A

DISPENSER PART: LRSC26910**, LRSC26911**

EXPLODED VIEWS

- 129 -

278A

402C

278G

405A

275A 276A

275C

275B

401C

275D

276B

277A

278B

278C

280C280G

280B

501A*

279D

279A

279B

279C

280E

280D

279E

278F

281A

280F

278G

TV PART: LRSC26980TT

EXPLODED VIEWS

- 130 -

628C

628A

628B

628U62

8T

628R

628P

628Q

628S

628E

628F

628D

628L

628J

628H

628I

628G

628K

pow

ertv

/radi

o

mut

em

ts

fcr

ch ch

vol

enter

mem

12

3

45

6

78

9

0

vol

exit

men

u

pres

et

dasp

flash

bkcc

slee

p

apc

628U

628V

P/No. 3828JD8646A FEB., 2004 Printed in Korea

LG Service Manual LRSC26922xx_S_M

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Transcript of LG Service Manual LRSC26922xx_S_M