LG LRSC26960xx Service Manual

CAUTION

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

REFRIGERATOR

SERVICE MANUAL

LRSC26960TT

http://biz.lgservice.com

CONTENTS

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

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

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

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

HOW TO ADJUST DOOR HEIGHT...................................................................................................................................... 6

FIL TER................................................................................................................................................................................. 7

HOW TO CONTROL THE ICEMAKER WATER SUPPLY.................................................................................................... 8

MICOM FUNCTION .............................................................................................................................................................. 10

EXPLANATION FOR MICOM CIRCUIT............................................................................................................................... 21

EXPLANATION FOR PWB CIRCUIT ..................................................................................................................................21

PWB PARTS DIAGRAM AND LIST.....................................................................................................................................38

PWB CIRCUIT DIAGRAM...................................................................................................................................................43

OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER ................................................................................... 45

OPERATION PRINCIPLE................................................................................................................................................... 45

CONTROL METHOD ACCORDING TO FUNCTIONS....................................................................................................... 46

DEFECT DIAGNOSIS FUNCTION..................................................................................................................................... 48

CIRCUIT................................................................................................................................................................................ 49

LINEAR COMPRESSOR...................................................................................................................................................... 50

MODE................................................................................................................................................................................. 50

DRIVING AND OPERATION...............................................................................................................................................51

PROTECTION LOGIC.........................................................................................................................................................51

TROUBLE DIAGNOSIS OF LINEAR COMPRESSOR........................................................................................................52

TROUBLE DIAGNOSIS........................................................................................................................................................ 53

TROUBLESHOOTING ....................................................................................................................................................... 53

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

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

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

HOW TO DISASSEMBLE AND ASSEMBLE....................................................................................................................... 92

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

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

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

ICEMAKER ASSEMBLY..................................................................................................................................................... 94

DISPENSER....................................................................................................................................................................... 95

EXPLODED VIEW ................................................................................................................................................................ 97

REPLACEMENT PARTS LIST........................................................................................................................................... 104

- 2 -

WARNINGS AND PRECAUTIONS FOR SAFETY

Please observe the following safety precautions to use the
refrigerator safely and correctly and to prevent accident or
injury when servicing.

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

2. When connecting power cord, please wait for more than
five minutes after power cord was disconnected from the
wall outlet.

3. Please check if the power plug is pressed by the
refrigerator against the wall. If the power plug was
damaged, it could cause fire or electric shock.

4. If the wall outlet is overloaded, it may cause a fire.
Please use a dedicated circuit for the refrigerator.

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

6. Use standard electrical components.

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

9. Please check for evidence of moisture intrusion in the
electrical components. Replace the parts or mask with
insulation tape if moisture intrusion was confirmed.

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

11. Do not suggest that customers repair their refrigerator

themselves. This work requires special tools and
knowledge. Non-professionals could cause fire, injury,
or damage to the product.

12. Do not store flammable materials such as ether,
benzene, alcohol, chemicals, gas, or medicine 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 into the freezer. The contents
will freeze and break the glass bottles.

7. Make sure hooks are correctly engaged.
Remove dust and foreign materials from the housing
and connecting parts.

15. When you scrap or discard the refrigerator, remove the
doors and dispose of it where children are not likely to
play in or around it.

- 3 -

SPECIFICATIONS

Ref No. : GR-L267ATBT

ITEMS SPECIFICATIONS

DIMENSIONS 908 X 897 X 1771 mm

3

5

W

X

D X H (35

/4

X

35

/16

11

/16

X

69

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) (6

1

/2 oz.)

LUBRICATING OIL FREOL @10G (320 cc)

ITEMS SPECIFICATIONS

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)

in.)

16

/

11

1771 mm (69

1004 mm (391/2 in.)

3

908 mm (35

in.)

16

/

9

1741.5 mm (68

Front View Top View

in.)

in.)

4

/

16

/

3

11

1771 mm (69

1746.5 mm (68

/4 in.)

in.)

in.)

in.)

2

8

8

/

/

1

/

5

5

724 mm (28

779 mm (30

829 mm (32

in.)

in.)

8

/

16

/

5

5

897 mm (35

1261 mm (49

- 4 -

PARTS IDENTIFICATION

Humidity SwitchOptiChill Display

Lamp

Shelf

Egg Box

Snack Drawer

Vegetable Drawer

OptiChill

Door Rack

Shelf

Grab and Go

Can Server

Dairy Product Corner

Water Filter

Freezer

Compartment

Refrigerator

Compartment

Bottle Guide

Frame Display

Dispenser Lamp

Ice & Water

Dispenser Button

PWB Cover

Water Tubes

Lamp

Lower Cover

Door Rack

Drawer

(Wire/Plastic)

Automatic

Icemaker

Door Rack

Shelf

Door Rack

Ref No. : GR-L267ATBT

- 5 -

HOW TO INSTALL REFRIGERATOR

Adjusting
Screw

Driver

Height

Difference

Height
Difference

Height
Difference

Height
Difference

1

2

1. How to Align Refrigerator Doors

■ Level the refrigerator. (If the refrigerator is not installed on a flat floor, the height of freezer and refrigerator doors may
not be the same.)

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

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

Insert a driver B into the groove A if the adjusting
screw and turn in the direction of the arrow (clockwise)
until the refrigerator is level.

- 6 -

Insert a driver B into the groove A if the adjusting
screw and turn in the direction of the arrow (clockwise)
until the refrigerator is level.

HOW TO INSTALL REFRIGERATOR

2. Filter

Replace the filter when the indicator light comes on or the
performance of the icemker or water dispenser decreases
noticeably.

After changing the water filter cartridge, reset the water
filter status display and indicator light by pressing and
holding the FILTER/LIGHT button on the control panel for 3
seconds.(see page 18)

1. Remove the old cartridge.

Twist the knob of the cartridge counter clockwise.

2. Replace with a new cartridge.

Take the new cartridge out of its packaging and remove
protective cover from the o-rings.

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

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

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

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

Pull out the cartridge.

NOTE: There will be some water (25cc) in the filter

cartridge. Some spilling may occur. Catch it in a
bowl or towel.

3. After replacing the filter cartridge, flush the water system

by running water through the dispenser for about 3
minutes.
There may be a little air in the line, causing noise or
hissing. Run water through the dispenser until the noise
stops to purge the air from the system.

NOTE: - To purchase replacement water filter cartridges,

visit your local appliance dealer or parts
distributor, or call 877-714-7486.

- 7 -

HOW TO INSTALL REFRIGERATOR

2

1

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

3-1. Confirm the amount of water supplied to the icemaker.

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

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

confirm the operation of the geared motor.
It may damage the refrigerator or hurt your hands.

Water supply amount TABLE

ST AGE TIME TO SUPPL Y INDICA TIONS 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 in the
connected water line.

- 8 -

HOW TO INSTALL REFRIGERATOR

ww

WARNING

Personal Injury Hazard

Avoid contact with the moving parts of the ejector
mechanism, or with the heating element that releases
the cubes. DO NOT place fingers or hands on the
automatic icemaking mechanism while the refrigerator
is plugged in.

3-2. Operation instructions

A newly-installed refrigerator may take up to 24 hours
to begin making ice.

Icemaker

Feeler Arm

Cube Size
Indicator Light

The icemaker will produce eight cubes per
cycle—approximately 120–152 cubes in a 24-hour period,
depending on freezer compartment temperature, room
temperature, number of door openings and other operating
conditions.

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

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

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

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

Be sure nothing interferes with the sweep of the feeler arm.
When the bin fills to the level of the feeler arm, the

icemaker will stop producing ice.
It is normal for several cubes to be stuck together.
If ice is not used frequently, old ice cubes will become

cloudy, taste stale, and shrink.

Water Supply
Control Switch

Power Switch

NOTE: Water pressure will affect the amount of water
which enters the icemakers. To change the size of ice
cubes, toggle through the size options by pressing the
Water Supply Control switch repeatedly. The higher the
position of the indicator light, the larger the cubes will be.

3-3. When you should set the icemaker power

switch to O (off)

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

• When the ice storage bin is removed for more than a

minute or two.

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

3-4. 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, it
will 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) position
before the water line is connected can damage the
icemaker.

• You will hear the sound of cubes dropping into the bin

and water running in the pipes as the icemaker refills.

3-5. Preparing for Vacation

Set the icemaker power switch to O (off) and shut off the
water supply to the refrigerator.

If the ambient temperature will drop below freezing, have a
qualified servicer drain the water supply system (on some
models) to prevent serious property damage due to
flooding from ruptured water lines or connections.

- 9 -

MICOM FUNCTION

ICEBEAM
COOLING

OFF

CUBE

FILTER
MONTH

EXPRESS/JET FRZ DISPENSER FREEZER REFRIGERATOR FILTER/LIGHT LOCK

ROOM TEMP

DISPENSER & KEY

F

WATER

5
4
3
2
1

CRUSH

F F

3 SECS

Dispenser selection
button

Express Freezer/Jet Freezer
function selection button

Dispenser and Button

Lock button

Dispenser Lamp On/Off button/

Filter status display RESET button

Temperature adjustment button

for refrigerator compartment

Temperature adjustment button
for freezer compartment

1. Display Panel

2. User Controls

2-1-1. Temperature Selection

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

Setting
temperature

Temperature
Control

Freezer Control
Refrigeration

Control

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

❉ Pressing the button cycles through the temperature settings in order : Medium → Medium Cold → Coldest → Warmest →

Medium Warm.

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

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

5
4
3
2
1

Medium Medium Cold Coldest Warmest Medium Warm

-2 °F -5 °F -8 °F7 °F4 °F

37 °F 34 °F 32 °F 46 °F 41 °F

5
4
3
2
1

5
4
3
2
1

5
4
3
2
1

5
4
3
2
1

- 10 -

MICOM FUNCTION

DISPENSER & KEY

3 SECS

LOCK

DISPENSER & KEY

3 SECS

LOCK CONTROL

Select
LOCK

Select

LOCK again

In initial

Power On

Classification

Filter Status

Display

Pass of

a month

Pass of

2 months

Pass of

3 months

Pass of

4 months

Pass of

5 months

Pass of

6 months

3 SECS

FILTER
MONTH

FILTER
MONTH

FILTER
MONTH

FILTER
MONTH

FILTER
MONTH

FILTER

MONTH

FILTER

MONTH

FILTER LIGHT

3 SECS

FILTER LIGHT

2-1-2. LCD Back Light Control

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

2. When any display button is pressed while the backlight is off, the buzzer sounds and the backlight is turned on, but the
button function is not performed. In other words, pressing any button turns on the backlight but does not cause any
function 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 display
returns 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 the
same room.

2. Ambient temperature is displayed between 16
temperatures 121

°F

and above are displayed as Hi. If the ambient temperature sensor fails, Er will be displayed.

2-1-4. Dispenser and Display Lock

1. When the refrigerator is first powered up, the LOCK text on the display is turned off.

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

3. While the Control Panel is locked, The dispenser and all control buttons except the Lock button are deactivated

4. To unlock the controls, press and hold the lock button for about 3 seconds. The LOCK text on the display will be turned
off.

°F

and 120°F. Temperatures 15°Fand below are displayed as Lo and

2-1-5. Filter condition display

1. As shown below, the display tells the months left in units of 30 days (or about 4,700 seconds of filter usage) before the

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

3. After 6 months have passed, if the filter has been replaced or you wish to reset the indicator, press and hold the Filter

filter must be replaced. The timer is started at the initial power up of the refrigerator.

Light button for about 3 seconds.

- 11 -

MICOM FUNCTION

DISPENSER

LCD

CUBE

WATER

CRUSH

Pressing

Switch

EXPRESS/JET FRZ

OFF

EXPRESS FRZ

JET FRZ

Dispenser Iight OFFDispenser Iight ON

CN

2-2. Ice / Water Dispenser

❉ Select water, crushed ice, or ice cubes by cycling through the selections when

pressing the DISPENSER button.

❉ Please press the push button lightly by catching and pushing in cup.

• You’ll hear a PLAP sound 5 seconds after ice is dispensed.

• That is the sound of the ice dispenser door flap being closed.

REFERENCE : Hold your cup in the dispenser for a few seconds after dispensing

ice or water to allow the last pieces of ice or drops of water to fall
into the cup.

2-3. Express Freeze / Jet Freeze

Please select this function for prompt freezer.

• See sections 2-5 & 2-6 below for a detailed description of these features.

• The arrow mark graphic remains at the On status after flickering 4 times when selecting Special Refrigeration EXPRESS

FRZ or JET FRZ.

• When Express Freeze or Jet Freeze is finished, the freezer will automatically return to normal operation.

2-4. Dispenser Light

• The dispenser light is turned on when the dispenser switch or the FILTER/LIGHT button is pressed.

• Press the FILTER/LIGHT button again to turn the dispenser light off.

• If the dispenser light is not turned off with the FILTER/LIGHT button, it will turn off automatically after 7minutes.

- 12 -

MICOM FUNCTION

2-5. Express freezing

1. 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 is
selected 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 operate
only 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 cycle
will 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 cycle
will 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 Freezing

1. 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. Changed even if you select Jet Freezing.

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

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

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

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

- 13 -

MICOM FUNCTION

°F / SET TEMP

/ TIME REMAINING

MIN

WINE

3.0

1.5

0.5

QUICK

COOLING

THAW(lbs)

FRUIT
VEGE

CHILED

ROOM

PARTIAL

FREEZING

SELECT SELECT

HR

2-7. OptiChill

2-7-1. Temperature Control in OptiChill

1. The Optichill is positioned at the bottom of the refrigerator compartment. It allows the user to select a more specific
temperature 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 Optichill
compartment and the freezer, a heater at the bottom of the Optichill compartment, and a temperaturs adjustment display
at the top.

3. At initial power-up, the initial setting of the Optichill will be FRUIT VEGE. If only the refrigerator door is opened, the
Optichill LED will be ON.

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 show
the target temperature. If QUICK COOLING or THAW is selected, the selected temperature and NOTCH LED are not
shown, and the temperature can be adjusted.

5. The Optichill sensor detects the temperature and relays this information to the MICOM. Based on the temperature and
setting, 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 previous
setting 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 and
hold both the EXPRESS / JET FRZ and FREEZER buttons for 3 seconds.

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

NOTCH

Partial

Freezing

Chilled

Room

Fruit

VEGE

Wine

Display 27°F30°F39°F50°F

3.0lbs 1.5lbs

12Hr 8Hr 4Hr 90Min 50°F

THAW

0.5lbs

QUICK

COOLING

Function

2-7-2. Thawing and Quick Cooling function in OptiChill

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

2. If QUICK COOLING is selected, the Optichill damper is opened and the fan motor is turned on. If the Optichill does not
reach 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 QUICK COOLING cycle ends (or is released), the setting defaults to FRUIT VEGE (39°F).

5. If a THAWING is selected, the Optichill damper is closed and the time and temperature will be set according to the
thawing function selected. The thawing function will be automatically terminated at the ned 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).

- 14 -

MICOM FUNCTION

Doors of freezing /
cold storage room

or home bar

BUZZER

Closing

Opening

Within

a minute

A minute

30

seconds30seconds30seconds

Opening

Closing Closing

3 Times 3 Times 3 Times 3 Times

2-8. Control of variable type of freezing fan

1. To increase the cooling speed and load response speed, the MICOM 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 a
high 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 regular
speed. 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 rotation
signal for 115 seconds, the MICOM displays the error on the display. To restart the fan, clear the obstruction and turn the
power off and back on.

2-9. Control of cooling fan motor

1. The cooling fan is switched ON and OFF in conjunction with the compressor.

2. The cooling fan runs at a single speed.

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

2-10. Door opening alarm

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

2. If the doors are left open for more than one minute, the buzzer sounds three
four times.

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

1

/

2-second tones at thirty second intervals for

2-11. Ringing of button selection buzzer

1. The DING sounds if you press any button on the front display.

- 15 -

MICOM FUNCTION

2-12. Automatic Defrost Signal

1. 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 Function

1. 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 4

3. Defrost is completed when the defrost sensor temperature rises above 41°F (5°C) during the defrost cycle. The defrost
cycle 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 off

• The refrigerator light is turned ON and OFF by the refrigerator door switch.

• If the refrigerator light is on for more than 7 minutes, it will be turned off automatically. It will operate normally if you close

the door and re-open it.

1

/2

hours.

- 16 -

MICOM FUNCTION

POWER

ON

COMP

ON

F-FAN

&

C-FAN

ON

R-STEP
MOTOR

DAMPER

ON

OPTICHILL

STEP

DAMPER

MOTOR

ON

DEFROST

HEATER

OFF

DEFROST

HEATER

ON

DAMPER

&

DUCT DOOR

&

OPTICHILL

HEATER ON

DAMPER

&

DUCT DOOR

&

OPTICHILL

HEATER OFF

0.3

sec.

6.0

sec.

0.3

sec.

0.3

sec.

0.3

sec.

POWER

ON

0.3

sec.

PIPE

&

DISP'

HEATER

OFF

0.3

sec.

COMP

ON

0.3

sec.

F-FAN

&

C-FAN

ON

0.3

sec.

R-STEP

MOTOR

DAMPER

ON

0.3

sec.

OPTICHILL

STEP

DAMPER

MOTOR

ON

PIPE

&

DISP'

HEATER

ON

TEST

SWITCH

(PRESS

Once)

OTHER

LOAD

OFF

COMP

ON

F-FAN

&

C-FAN

ON

R-STEP

MOTOR

DAMPER

ON

OPTICHILL

STEP

DAMPER

MOTOR
CLOSE

TEST

SWITCH

(PRESS

2 Times)

COMP

OFF

F-FAN

&

C-FAN

OFF

FROST

REMOVAL

HEATER

ON

R-STEP
MOTOR

DAMPER

CLOSE

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

0.3

sec.

2-15. Sequential operation of built-in product

Electromechanical parts of the appliance, such as the compressor, defrost heater, freezer fan, cooling fan, and damper
motor, are operated sequentially as shown in the chart below to prevent noise and circuit overload from everything starting
at once.

Function Load Operation Sequence Remark

When temperature
of a defrost sensor
becomes more
than 45°C
(In purchase,
movement)

In applying Initial power TEST MODE

When
temperature of a
defrost sensor
becomes less
than 45°C
(In power failure,
service)

Test mode 1
(Compulsory
function)

Test mode 2
(Compulsory
defrost)

If error occurs
during operation,
initial operation is
not done.

■

Sequence of
load operation
when closing
freezer and
refrigerator.

The refrigerator
will return to
normal operation
if you press the
test switch once
again while in
Test Mode 2 or if
the temperature
of the defrost
sensor surpasses
41°F (5°C). The
compressor will
run after the 7­minute delay.

- 17 -

MICOM FUNCTION

ICEBEAM
COOLING

OFF

CUBE

FILTER
MONTH

ROOM TEMP

DISPENSER & KEY

F

WATER 5

4
3
2
1

CRUSH

F F

3 SECS

C

E

A B D

FAILURE CODE

INDICATION PART

2-16. Failure Diagnosis Function

1. The failure diagnosis function makes servicing simpler by
indicating 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.

Failure code indication part

No. Item

1

Abnormal
freezer sensor

2

Abnormal refrigerator
sensor 1 (R1)
(Upper part in the
refrigerator
compartment)

3

Abnormal refrigerator
sensor 2 (R2)
(Middle part in the
refrigerator
compartment)

Abnormal defrost

4

sensor
Failed defrosting

5

Abnormal freezing

6

BLDC motor
Abnormal cooling

7

BLDC motor

Communication

8

Errors.

Abnormal

9

ambient sensor
Abnormal

10

Optichill sensor
Abnormal Main

11

PWB
communication

Abnormal Linear

12

compressor
Abnormal

13

Supplied Power
Voltage

✽ All displays turn off other than freezer room temperature display and refrigerator room temperature display(failure code

indication part) in case of indicating failure modes(except for Note1, Note2).

Freezer

temperature

display

Refrigerator
temperature

display

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)

Er Cd

Er Cp

Er Po

Freezer sensor short circuit

Refrigerator sensor1 short circuit

Refrigerator sensor2 short circuit

Abnormal short circuit

Defrost heater, temperature fuse short
circuit, unplugged connector(indicated
4 hour later after trouble)

Motor defect, hooked of lead wire
to fan, contact of structures with
fan, short or open of lead
wire(there is no signal of BLDC
motor more than 115 seconds in
operation of fan motor)

Short or open of lead wire
connecting between main PCB
and display PCB, transmission tr
and receiving part

Ambient sensor short circuit

Optichill sensor short circuit

Communication Error between
Main Micom and Compressor
Driver Micom in Main PCB.

Linear Compressor failed starting.

Abnormal Supplied Power
Voltage.

Contents of failure

- 18 -

Product operation status in failure

Compressor

ON for 15minutes /

OFF for 15minutes

●●

Freezing

BLDC motor

Standard

RPM

Standard

RPM

Standard

●●

RPM

Standard

●●

RPM

Standard

●●

RPM

●●

●●

OFF

Standard

RPM

Standard

●●

RPM

●●

●●

●●

(small

●●

●●

standard

RPM

stroke)

OFF

(continuous)

OFF

OFF

standard

RPM

Cooling

BLDC motor

●●

●●

●●

●●

●●

●●

OFF

●●

●●

●●

●●

OFF

●●

●●

: Proper operation

Defrost

Heater

motor damper

●●

●●

Full opening for

Full closing for

●●

No defrost

●●

●●

●●

●●

●●

●●

No defrost

No defrost

●●

Stepping

●●

10 minutes/
15 minutes

●●

●●

●●

●●

●●

●●

●●

●●

●●

●●

●●

MICOM FUNCTION

Note1) The freezer and refrigerator temperature displays are also used to display error codes. The exception is that when

the ambient temperature sensor fails, it shows Er in the ambient temperature display. All other display elements will
function normally.

Note2) The R2 sensor, Optichill sensor, and water tank sensor are not indicated in the error codes, but you can see these

errors by entering the test mode by pressing and holding the Freezer Temperature and Super Freezer buttons
simultaneously.

R2-sensor (middle room)

Optichill sensor

Water tank sensor

✻ LCD (LED) check function: LCD (LED) Press and hold the Express Freeze button and the Freezer Temperature

adjustment 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.

Normal: LED or LCD graphic on the (C) part turns on
Abnormal: LED or LCD graphic on the (C) part turns off

Normal: LED or LCD graphic on the (D) part turns on
Abnormal: LED or LCD graphic on the (D) part turns off

Normal: LEDs or LCDs graphic on the (E) part turns on
Abnormal: LEDs or LCDs graphic on the (E) part turns off

The other LED or
LCD Graphics
Turn On.

- 19 -

MICOM FUNCTION

5
4
3
2
1

ICEBEAM
COOLING

CUBE

FILTER
MONTH

ON

ROOM TEMP

DISPENSER & KEY

WATER 5

4
3
2
1

CRUSH

3 SECS

EXPRESS FRZ

F

C

F

C

LOCK

F

C

JET

3 SECS

FILTER LIGHT

2-17. Test Function

1. 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 operation
mode 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 and
display the failure code.

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

Mode Operation Contents Remarks

Test 1

Test 2

Normal

Status

Press test button once
(strong cold mode)

1. Continuous operation of compressor

2. Continuous operation of freezing BLDC motor

3. Defrost heater turns off

4. Stepping motor damper is completely opened

5. Optichill stepping motor damper is completely

6. All display LEDs or LCD graphics turn on.

Press test button once at
the test mode 1 status

1. Compressor OFF

2. Freezing BLDC motor and cooling BLDC

(forced defrost mode)

3. Defrost heater turns on

4. Stepping motor damper is completely closed

5. Optichill stepping motor damper is completely

6. All display LEDs or LCD graphics turn off.

Press test button once at

Return to the initial status.

the test mode 2 status

TEST MODE1 STATUS DISPLAY

(high-speed RPM) and cooling BLDC motor

(baffle open)
closed.

motor turn off

(baffle close)
closed.
Except for (A), (B) LCD graphic.

Except for (A): 22 (B): 22 LEDs.

TEST MODE2 STATUS DISPLAY

Freezer fan is off when
door is open.

Return to the normal mode
when the defrost sensor is
above +5°C

Compressor will operate
after delay for 7 minutes

2-18. Function of built-in ice and water dispenser.

1. 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 and
overheating 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/Water

1) Select Cubes/Crushed/Water using the selection button

2) The default at power-up is Cubes

3) The geared motor operates when Cubes or Crushed is selected.

7. Water Dispenser Function

1) Select Water using the selection button

2) 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.

- 20 -

EXPLANATION FOR MICOM CIRCUIT

1. Explanation for PWB circuit

1-1. Power circuit

The power circuit consists of a Noise filter (SUB PWB) which plays the role of noise rejection and an SMPS (Switching
Mode Power Supply) power. The SMPS consists of the rectifying part (BD1, CE1) converting AC voltage to DC voltage, the
switching part (IC2) switching the converted DC voltage, transformer transferring energy of the primary side of the switching
terminal to secondary side and a feedback part (IC3, IC4) transferring it to the primary side Linear Compressor driver SMPS
consist of two (+,-) output power source.

Caution: The linear compressor drive circuit (IC201) and the general circuit (IC1) have separated supplies and grounds.

Therefore, when checking voltages be sure to use the correct ground when checking each circuit.

Voltage of every part is as follows:

Part CM3 CE1 CE203 CE204 CE3 CE4

Voltage 120 Vac 160 Vdc 12.5 Vdc -12.5 Vdc 15.5 Vdc 12 Vdc

Caution: High voltage (160 VDC) is maintained at the power terminal. Wait at least 3 minutes after removing power cords,

for capacitors to discharge, before taking measurements.

- 21 -

EXPLANATION FOR MICOM CIRCUIT

1-2. Oscillation circuit

The Oscillation circuit (OSC1 & OSC201) generate basic timed signals for time calculations and synchronization for IC1 &
IC201.

1-3. Reset circuit

The reset circuits allow the MICOM ICs (IC1 & IC201) to initialize and start operation at initial power-up or following a power
failure. The circuits provide a LOW voltage to the reset terminal of each IC for 10ms.
During general operation, the voltage at the reset terminal of the IC is 5V. If a reset IC fails, the MICOM cannot operate.

- 22 -

EXPLANATION FOR MICOM CIRCUIT

1-4. Linear Compressor Driver Circuit

It includes the driver MICOM (IC201), OP AMP, and controls the compressor. The linear compressor controls the phase
angle of the TRIAC to drive. When the motor drives, it detects double-ended voltage & electric current of the motor in order
to determine the phase angle of TRIAC.

In the linear compressor, there is a protection circuit to protect compressor under abnormal circumstances.
If an abnormality of electric current and voltage is detected driving the linear compressor, MICOM makes driving of the
compressor stop to protect the compressor. After the voltage and current return to normal, the compressor can be operated
again after a few minutes.

If the compressor will not run even though the voltage and temperature readings are correct, check the protection circuit.

- 23 -

EXPLANATION FOR MICOM CIRCUIT

1-5. Communication circuit between Main MICOM and Drive MICOM

This circuit carries ON/OF information between the main MICOM (IC1) and the linear compressor drive MICOM (IC201),
based on information from the damper closed, door open/closed, and room temperature sensors, and the compressor
protection circuit. If there is a communication breakdown, the compressor is turned off and error code “Er-Cd” is displayed.

MICOM IC1 IC201

PIN PIN47 PIN48 PIN24 PIN25

Status

Success IV~4V

Fail 0V or 5V

- 24 -

EXPLANATION FOR MICOM CIRCUIT

1-6. Load/dispenser operation, door opening circuit

1-6-1. LOAD DRIVING CIRCUIT

1. In even if opening the door of cold storage room during operation of fan motor at the freezing room, this circuit does not
operate. In addition if closing the door of cold storage room, the fan motor normally operates at the RPM previously
operated.

2. (A), (B), (C) and (D) of door switch for the freezing room of cold storage room are connected to the door open sensing
circuit in parallel toward both ends of switch to determine door open at MICOM.

3. Since a door switch of the home bar is connected to door switch (C), (D) of the cold storage room, it sensed door opening
if even one of both is opened (only P model).

4. The fan motor is immediately stop if opening doors of the freezing room or cold storage room at the TEST mode and it
immediately operates if closing them.

Frost

Type of Load

Measuring point IC7-NO.10 IC8-NO.16 IC7-NO.13 IC7-NO.11 IC8-NO.10 IC7-NO.16 IC7-NO.12

Status

ON Within 1 V

OFF 12 V

Removal

Heater

Frost

Removal

Convert

Relav

Refrigerator

Lamp

Pipe &

Dispensor

Heater

Home Bar

Heater

(only P model)

Damper
Heater Duct
Door Heater

Optichill

Heater

- 25 -

EXPLANATION FOR MICOM CIRCUIT

2. Dispenser operation circuit

1) Check load driving status

Type of Load

Measuring point IC8-NO.15 IC8-NO.14 IC8-NO.13 IC8-NO.13

Status

2) Lever Switch sensing circuit

Measuring point

Lever S/W

On(Press)

OFF 5V

ON Within 1 V

OFF 12 V

GEARED

MOTOR

5 V
0 V

SOLENOID

CUBE

IC1(Micom) (No. 16)

WATER VALVE

(60 Hz)

SOLENOID

DISPENSER

- 26 -

EXPLANATION FOR MICOM CIRCUIT

3. Door opening sensing circuit

Measuring point

Door of Freezer / Refrigerator

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)

✽ 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.

IC1 (MICOM) No. 47, 46 Pin

- 27 -

EXPLANATION FOR MICOM CIRCUIT

1-7. Temperature sensing circuit

The circuits involving the freezer and refrigerator sensors controls 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 the
efficiency of the defrost operation. See the table below for voltages and checkpoints.

SENSOR CHECK POINT

Room temperature sensor POINT A Voltage

Water tank sensor POINT B Voltage

Freezing sensor POINT C Voltage

Frost removal sensor POINT D Voltage 0.5 V~4.5 V 0 V 5 V
Cold storage sensor 1 POINT E Voltage
Cold storage sensor 2 POINT F Voltage

Optichill sensor POINT G Voltage

NORMAL(-22°F ~ 122 °F) IN

SHORT IN OPEN

- 28 -

EXPLANATION FOR MICOM CIRCUIT

1-8. Switch entry circuit

The following circuit senses signals from the test switch, damper motor reed switch for testing and diagnosing the
refrigerator.

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

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

u These circuits are preset at the factory and cannot be altered.

Separation Connection Status Application Standard

OP1

OP2

Closed Domestic (KOREA) Model

Open Export Model

Closed L.P. Model

Open B Model

- 29 -

EXPLANATION FOR MICOM CIRCUIT

4,5,7,
12,13

6
3

INA

INB

A

B

A

B

CCW (Reverse rotation) (Positive rotation) CW

1-10. Stepping motor operation circuit

The motor is driven by magnetism formed in the areas of the coils and the stator. Rotation begins when a HIGH signal is
applied 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 in

the chart below. These signals are output via terminals 10, 11, 14, and 15 via input terminals 3, 6, and 8 of
IC10 (TA7774F), the motor drive chip. The output signals allow the coils wound on each phase of the stator to
form a magnetic field, which causes rotation. Input to the terminals INA and INB of IC10 as shown in the chart
below drives the motor.

- 30 -