LG LBC20514TT Service Manual

REFRIGERATOR

SERVICE MANUAL

CAUTION

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

MODELS:

LBC20514TT

CONTENTS

Safety Precautions………………………………………………................................ 2

1- Specifications…………………………………………………................................ 3

2- Parts Identifications …………………………………………................................ 4

3- Disassembly……………………………………………………............................... 5

Door……………………………………………………………...................................5

Door Switch……………………………………………………...................................5

Fan and Fan Motor……………………………………………..................................6

Defrost Control Assembly ……………………………………..................................6

Lamp……………………………………………………………..................................6

Refrigerator Control Box……………………………………….................................6

Multi Duct………………………………………………………..................................6

4- Ajustment……………………………………………………....................................7

Compressor……………………………………………………..................................7

PTC-Starter…………………………………………………….................................. 7

OLP (Overload Protector)…………………………………….................................. 8

To Remove the Cover PTC………………………………….................................. 8

5- Circuit Diagram……………………………………………..................................... 9

6- Troubleshooting……………………………………...................................……….10

Compressor and Electric Components…………………....................................…10

PTC and OLP …………………………………………....................................…….11

Other Electrical Components………………………….....................................……12

Service Diagnosis Chart……………………………....................................………13

Refrigeration Cycle…….………………………………....................................……14

7- Operation Principle and Repair Method of Ice Maker….................................16

8- Description of Function and Circuit of MICOM……….............................……19

11- Refrigerator Exploded View ….......................................................................38

SAFETY PRECAUTIONS

Pleasereadthefollowinginstructionsbeforeservicingyour
refrigerator.

1.Checktherefrigeratorforcurrentleakage.

2.Topreventelectricshock,unplugbeforeservicing.

3.Alwayschecklinevoltageandamperage.

4.Usestandardelectricalcomponents.

5.Don'ttouchmetalproductsinthefreezerwithwet
hands.Thismaycausefrostbite.

6.Preventwaterfromspilingontoelectricelementsorthe
machineparts.

7.Beforetiltingtherefrigerator,removeallmaterialsfrom
onorintherefrigerator .

8.Whenservicingtheevaporato,rwearglovestoprevent
injuriesfromthesharpevaporatorfins.

9.Serviceontherefrigeratorshouldbeperformedbya
qualifiedtechnician.Sealedsystemrepairmustbe
performedbyaCFCcertifiedtechnician.

- 2 -

1. SPECIFICATIONS

Models

LBC20514TT

Color
Capacity
Dimensions (in)
Refrigerant
Climate Class
Control Type
Rating
Case Material
Door Material
Reversible Door
Lamp (F)
Lamp ( R )
Basket (F)
Basket ( R )

Specification

Shelf (F)
Shelf ( R )
Cover, TV
Drawer
Vegetable
Tray Meat

Multi Flow

Titanium

20cuft

29.8 (W) x 32.2 (D) x 67.9 (H)
R134A (4.2oz)

Temperate(N)

F-control

115/60

EMBO(Normal)

VCM

Yes
1 (40W/Blue)
2 (40W/Blue)

1 (plastic)

2 (1/3)
2 (2/3)

1 full

1 Wire

4 fix

Humidity Control

Wire (lower)

Yes

Yes

Yes

- 3 -

2. PARTS IDENTIFICATIONS

PARTSANDFEATURES

A

B

C

D

E

F

G

H

I

J

K

L
M

N

Use this section to become more familiar with the parts and features.

NOTE:This guide covers several different models.The refrigerator you have purchased may have some

or all of the items listed below.The locations of the features shown below may not match your model.

Digital Sensor Control

A
B

Refrigerator Light

C

Shelves

D

Snack Pan

E

Optibin Crisper
Keeps fruits and vegetable fresh and crisp

Ice Tray*

F

G

Ice Bin

H

Wire Durabase

I

Dairy Bin

J

Design-A-Door

K

Wire Freezer Shelf

L

Refrigerator Door Rack
Freezer Light

M

Freezer Door Rack

N

*on some models

- 4 -

3. DISASSEMBLY

3-1 DOOR

Refrigerator Door

1. Remove the hinge cover by pulling it upwards.

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

HINGE COVER
BOLT

HINGE

Figure 1

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

GASKET

Freezer Door

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

LOWER HINGE

BOLT

Figure 3

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

3-2 DOOR SWITCH

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

2. Disconnect the lead wire from the switch.

Figure 2

LEAD WIRE
DOOR SWITCH

Figure 4

- 5 -

3-3 FAN AND FAN MOTOR

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

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

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

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

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

FAN MOTOR

BRACKET

MOTOR

FAN

GRILLE

Figure 11

3-5-1 Refrigerator Compartment Lamp

1. Unplug the power cord from the outlet.

2. Remove refrigerator shelves.

3. Release the hooks on both ends of the lamp shield and
pull the shield downward to remove it.

4. Turn the lamp counterclockwise.

5. Assemble in reverse order of disassembly. Replacement
bulb must be the same specification as the original
(Max. 60 W-2EA).

Figure 9

3-5-2 Freezer Compartment Lamp

1. Unplug refrigerator or disconnect power.

2. Reach behind light shield to remove bulb.

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

4. Plug in refrigerator or reconnect power.

3-4 DEFROST CONTROL ASSEMBLY

Defrost Control assembly consists of Defrost Sensor and
FUSE–M.

The Defrost Sensor works to defrost automatically. It is
attached to the metal side of the Evaporator and senses its
Temperature.
Fuse-M is a safety device for preventing over-heating of
the Heater when defrosting.

At 72°C, it turns the Defrost Heater off.

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

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

GRILLE ASSEMBLY

Figure 6

DEFROST-CONTROL
ASSEMBLY

Figure 7

3-5 LAMP

3-6 CONTROL BOX-REFRIGERATOR

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

CONTROL BOX

COVER LAMP

Figure 10

2. Remove the Refrigerator Control Box by pulling it
downward.

3. Disconnect the lead wire on the right position and
separate the lamp sockets.

3-7 MULTI DUCT

1. Remove an upper and
lower Cap by using a flat
screwdriver, and loosen 3
screws. (Figure 11)

2. Disconnect the lead wire
on the bottom position.

Figure 8

Figure 11

- 6 -

4. ADJUSTMENT

4-1 COMPRESSOR

4-1-1 Role

The compressor intakes low temperature and low pressure
gas from the evaporator of the refrigerator and compresses
this gas to high-temperature and high-pressure gas. It then
delivers the gas to the condenser.

4-1-2 Composition

The compressor includes overload protection. The PTC
starter and OLP (overload protector) are attached to the
outside of the compressor. Since the compressor is
manufactured to tolerances of 1 micron and is hermetically
sealed in a dust and moisture-free environment, use
extreme caution when repairing it.

4-1-3 Note for Usage

(1) Be careful not to allow over-voltage and over-current.
(2) If compressor is dropped or handled carelessly, poor

operation and noise may result.

(3) Use proper electric components appropriate to the

Particular Compressor in your product.

(4) Keep Compressor dry.

If the Compressor gets wet (in the rain or a damp
environment) and rust forms in the pin of the Hermetic
Terminal, poor operation and contact may result.

(5) When replacing the Compressor, be careful that dust,

humidity, and soldering flux don’t contaminate the inside
of the compressor. Dust, humidity, and solder flux
contaminate the cylinder and may cause noise,
improper operation or even cause it to lock up.

4-2 PTC-STARTER

4-2-1 Composition of PTC-Starter

(1) PTC (Positive Temperature Coefficient) is a no-contact

semiconductor starting device which uses ceramic
material consisting of BaTiO

(2) The higher the temperature is, the higher the resistance

value. These features are used as a starting device for
the Motor.

4-2-2 Role of PTC-Starter

(1) The PTC is attached to the Sealed Compressor and is

used for starting the Motor.

(2) The compressor is a single-phase induction motor.

Durign the starting operation, the PTC allows current
flow to both the start winding and main winding.

3.

4-2-3 PTC-Applied Circuit Diagram

Starting Method for the Motor

OVERLOAD PROTECTOR

N

PTC

2

L1

Resistance Starter Capacitor Running

3

PTC STARTER

5

6

C

COMPRESSOR
MOTOR

S

M

S

SEALED
TERMINAL

M

Figure 12

4-2-4 Motor Restarting and PTC Cooling

(1) It requires approximately 5 minutes for the pressure to

equalize before the compressor can restart.

(2) The PTC device generates heat during operation.

Therefore, it must be allowed to cool before the
compressor can restart.

4-2-5 Relation of PTC-Starter and OLP

(1) If the compressor attempts to restart before the PTC

device is cooled, the PTC device will allow current to
flow only to the main winding.

(2) The OLP will open because of the over current

condition. This same process will continue (3 to 5
times) when the compressor attempts to restart until
the PTC device has cooled. The correct OLP must be
properly attached to prevent damage to the
compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part
number and model number. Using an incorrect part
could result in damage to the product, fire, injury, or
possibly death.

4-2-6 Note for Using the PTC-Starter

(1) Be careful not to allow over-voltage and over-current.
(2) Do not drop or handle carelessly.
(3) Keep away from any liquid.

If liquid such as oil or water enters the PTC,
PTC materials may fail due to breakdown of their
insulating capabilities.

(4) If the exterior of the PTC is damaged, the resistance

value may be altered. This can cause damage to the
compressor and result in a no-start or hard-to-start
condition.

(5) Always use the PTC designed for the compressor and

make sure it is properly attached to the compressor.
Parts may appear physically identical but could have
different electrical ratings. Replace parts by part
number and model number. Using an incorrect part
could result in damage to the product, fire, injury, or
possibly death.

- 7 -

4-3 OLP (OVERLOAD PROTECTOR)

4-3-1 Definition of OLP

(1) OLP (OVERLOAD PROTECTOR) is attached to the

Compressor and protects the Motor by opening the
circuit to the Motor if the temperature rises and
activating the bimetal spring in the OLP.

(2) When high current flows to the Compressor motor, the

Bimetal works by heating the heater inside the OLP,
and the OLP protects the Motor by cutting off the
current flowing to the Compressor Motor.

4-3-2 Role of the OLP

(1) The OLP is attached to the Sealed Compressor used

for the Refrigerator. It prevents the Motor Coil from
being started in the Compressor.

(2) For normal operation of the OLP, do not turn the Adjust

Screw of the OLP in any way.

(OVERLOAD PROTECTOR cross section)

Part

No. Name

Base, phenolic
(UL 94 V-0 rated)
Movable arm support, plated steel
Stationary contact support,
plated steel
Heater support, plated steel
Heater, resistance alloy
Disc, thermostatic alloy
Movable arm, spring temper
copper alloy
Contact, movable, silver on copper
Contact, stationary, silver on copper
Slug, plated steel
Cover, polyester
(UL 94 V-0 rated)
Pin connector, plated copper alloy
(To engage 2.33/2.66 mm dia. pin)
Quick-connect terminal, brass,
conforms to UL 310, MEMA
DC-2, DIN 46344

Figure 13

Electrical

characteristics

part number

12345678

330 FBYY -S1 BOX98

Customer part
number

Lot code/
date code

Physical

termination
part number

4-4 TO REMOVE THE COVER PTC

1) Remove the Cover Back M/C.
(2) Remove the screw on Cover PTC.

1

(3) Remove two Housings on upper part of Cover PTC.
(4) Take out the cover PTC from upper to lower position

like ( 1 ).

2

(5) Turn 45¡ in the direction of (2) and take it out.
(6) Assembly in reverse order of disassembly.

- 8 -

5. CIRCUIT DIAGRAM

PWB(PCB) ASSEMBLY,DISPLAY

3SB52 8

1

CON101

WH

BL

BO

/RD

/WH

STEPPING

F-FAN

MOTOR

BL

WH

RD

/RD

8 11 13

10

9

7

BO

/WH

12

CON4

GY

BL3BK YLWH

5 6PR41

2

4

SB

6

BK

CON5

7

PK

WHPR

2 64BK5

9

YL

R-DOOR

PERCEPTION S/W

DC

PR

3

PKWH

YL

GY GY

107

111

8

9

12

PWB(PCB) ASSEMBLY, MAIN

L1

5 4

11

10BN9

8

YL

BN

POWER
SUPPLY

CORD

CON1

SB

SB

YL

N
L

GN/YL

(GN)

ICE MAKER PART

GN/YL

(GN)

M

MOTOR

SHEATH

HEATER,

ICE SENSOR

WH

WH
2

CON5

WH

WH

1

1

1

CON4

CON3

ICE MAKER

BL

BK

WH

2

1

2

CON1

CON2

PWB (PCB) ASSEMBLY, ICE MAKER

*PLUG TYPE, ICE MAKER PART, CAPACITOR PART,

P.T.C START OPTION, COMP' EARTH PART AND COMP'
ACCESSORIES ON CIRCUIT DIAGRAM ARE SUBJECT
TO CHANGE IN DIFFERENT LOCALITIES AND MODEL TYPE.

3

7

6

2

BL

BK

BL

BL BK

BL

(98 C)

FUSE-M

BK

V

S/W

POWER

I/MAKER

BK

RD

1

1

CON6

1

CAPACITOR PART

Cr

RD

W/VALVE

Cs

BLBL

COMP' ACCESSORIES

5

7

6

RD

BN

CON2

BN

RD

PK

22

44

33

PTC STARTER

* ALTERNATIVE COMP' ACCESSORIES

OLPBKOLP

S

S

55

M

M

66

COMP' EARTHCOMP' EARTH

Cr

BL

N

PTC

4

PARTPART

CON6

PK

1

PK

2
3

BO

4

BO

WH

5

WH

6

BL

7

BL

8

132

SB

F-DOOR

A

PERCEPTION S/W

B

DEF-SENSOR

R-SENSOR

F-SENSOR

SB

BK

(72 C)

FUSE-M

RD

M

C-FAN

GNGN

/YL

/YL

(GN)(GN)

BL

BL

BK

L

OLP

com

nc

DOOR S/W-F

A

B

BO

HEATER,SHEATH

BL BL

* P.T.C START OPTION

MC,MQ COMP'

2

4

3

com

nc

5

6

F-LAMP

DOOR S/W-R

EG COMP'

4

2

com

com

nc

nc

DC

PR

R-LAMPS

3

6

5

BK:BLACK

COMBO KIT(PTC+OLP)

BN:BROWNWH:WHITE

PK:PINKYL:YELLOW

GN:GREEN

BO:BRIGHT ORANGE
PR:PURPLE

GY:GREY

MEZ48108403

RD:REDSB:SKY BLUE
BL:BLUE

- 9 -

6. TROUBLESHOOTING

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

1

Power Source.

Remove PTC-Starter
from compressor and
measure voltage
between Terminal C of
compressor and

terminal 5 or 6 of PTC.

No voltage.

Applied voltage isn't
in acceptable range.
(115V ±10%)

(Rated voltage
±10%)?

YES

OLP disconnected?

NO

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

YES

Replace OLP.

Check connection
condition.

Reconnect.

2

5

5

2

3

4

5

Check

Check resistance

resistance of

of motor

motor

compressor.

compressor.

.

Check
resistance of
PTC-Starter.

Check OLP.

Check
starting state.

Check the resistance
between M-C, S-C and
M-S in motor compressor.

Check resistance of
two terminals in

PTC-Starter.

Check resistance of two
terminals in OLP.

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

Open or short

Refer to Page 12.

Refer to Page 12.

Supply
voltage rating
with ±10%.

The range of resistance is between 1~50 ? (ok)

Replace
compressor

YES

Did

compressor

start?

YES

NO

43

Compressor
is OK

Replace the
compressor

3

5

- 10 -

NO

1

6-2 PTC AND OLP

Normal operation of
compressor is impossible
or poor.

Separate PTC-Starter
from Compressor and
measure resistance

between No. 5 and 6
of PTC-Starter with a
Tester.
(Figure 19)

Separate OLP from
compressor and check
resistance value between
two terminals of OLP whit a
tester.
(Figure 20)

65

?

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

The resistance value
is 0 ? (short) or
8(open).

Shows continuity

Open

Replace PTC­Starter.

Check another
electric component.

Replace OLP.

Figure 19

Figure 20

- 11 -

6-3 OTHER ELECTRICAL COMPONENTS

Not cooling at all

Compressor

doesn't run.

Poor cooling performance

Compressor runs
poorly.

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

a. Starting devices
b. OLP

c. Compressor coil
d.Wiring harness

Check starting
voltage.

Check voltage at
starting devices.

Cause

Short, open, or broken.
Poor contact

or shorted.
Coil open or shorted.

Poor contact
or shorted.

Low voltage.

Poor or broken or
open contact.

Replace
indicated component.

Advise customer that
the power supply

needs to be checked

by an electrician.

Replace
indicated component.

Fan motor
doesn't run.

Heavy frost buildup on
evaporator

Check current flowing
in sub-coil of
Compressor.

Check rating of OLP.

Check wiring circuit.

Check Fan Motor.

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

Check current flow in
the defrost heater.

Shorted.

Lack of capacity.

Wire is open or
shorted.

Coil is shorted
or open.

Open.

Open.

Replace
indicated component.

Replace
indicated component.

Replace
defrost heater.

- 12 -

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT POINTS TO BE CHECKED REMEDY

No Cooling.

Cools poorly.

Foods in the
Refrigerator
are frozen.

Condensartion or ice
forms inside
the unit.

Condensartion forms
in the Exterior Case.

There is abnormal
noise.

• Is the power cord unplugged from the outlet?

• Check if the power switch is set to OFF.

• Check if the fuse of the power switch is shorted.

• Measure the voltage of the power outlet.

• Check if the unit is placed too close to the wall.

• Check if the unit is placed too close to the stove,
gas cooker, or in direct sunlight.

• Is the ambient temperature too high or
the room door closed?

• Check if food put in the refrigerator is hot.

• Did you open the door of the unit too often
or check if the door is sealed properly?

• Check if the Control is set to Warm position.

• Is food placed in the cooling air outlet?

• Check if the control is set to colder position.

• Is the ambient temperature below 41°F(5°C)?

• Is liquid food sealed?

• Check if food put in the refrigerator is hot.

• Did you open the door of the unit too
often or check if the door is sealed properly?

• Check if the ambient temperature and humidity
of the surrounding air are high.

• Is there a gap in the door gasket?

• Is the unit positioned in a firm and even place?

• Are any unnecessary objects placed
in the back side of the unit?

• Check if the Tray Drip is not firmly fixed.

• Check if the cover of the compressor enclosure
in the front lower side is taken out.

• Plug into the outlet.

• Set the switch to ON.

• Replace the fuse.

• If the voltage is low, correct the wiring.

• Place the unit about 4 inches (10 cm) from the wall.

• Place the unit away from these heat sources.

• Lower the ambient temperature.

• Put in foods after they have cooled down.

• Don't open the door too often and close
it firmly.

• Set the control to Recommended position.

• Place foods in the high-temperature section.
(front part)

• Set the control to Recommended position.

• Set the control to Warm position.

• Seal liquid foods with wrap.

• Put in foods after they have cooled down.

• Don't open the door too often and close
it firmly.

• Wipe moisture with a dry cloth. It will disappear
in low temperature and humidity.

• Fill up the gap.

• Adjust the Leveling Screw, and position the
refrigerator in a firm place.

• Remove the objects.

• Fix the Tray Drip firmly in the original position.

• Place the cover in its original position.

Door does not
close well.

Ice and foods
smell unpleasant.

Other possible problems:

Check if frost forms in
the freezer.

Check the
refrigeration system.

Check the
Thermistor.

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

• Is the refrigerator level?

• Is there too much food in the refrigerator?

• Check if the inside of the unit is dirty.

• Are foods with a strong odor unwrapped?

• The unit smells of plastic.

Not
defrosting

The system
is faulty.

The operation of
the Thermistor is
incorrect.

• Clean the door gasket.

• Position in the firm place and level the
Leveling Screw.

• Make sure food stored in shelves does not prevent
the door from closing.

• Clean the inside of the unit.

• Wrap foods that have a strong odor.

• New products smell of plastic, but this
will go away after 1-2 weeks.

Check Components
of the defrosting
circuit.

Perform sealed
system repair.

Replace the
Thermistor.

- 13 -

6-5 REFRIGERATION CYCLE

* Troubleshooting Chart

CAUSE

PARTIAL
LEAKAGE

LEAKAGE

COMPLETE
LEAKAGE

CLOGGEDBYDUST

PARTIAL
CLOG

WHOLE
CLOG

MOISTURE
CLOG

COMPRESSION

COMPRE-

DEFECTIVE

SSION

NO
COMPRE-
SSION

STATE OF

THE UNIT

Freezer
compartment and
refrigerator don’t
cool normally

Freezer
compartment and
refrigerator don’t
cool normally

Freezer
compartment and
refrigerator don’t
cool normally

Freezer
compartment and
refrigerator don’t
cool.

Cooling operation
stops periodically.

Freezer and
refrigerator don’t
cool.

No compressing
operation.

STATE OF THE

EVAPORATOR

Low flowing sound of
refrigerant is heard and frost
forms in inlet only.

Flowing sound of refrigerant
is not heard and frost isn’t
formed.

Flowing sound of refrigerant
is heard and frost forms in
inlet only.

Flowing sound of refrigerant is
not heard and frost isn’t
formed.

Flowing sound of refrigerant is
not heard and frost melts.

Low flowing sound of
refrigerant is heard and frost
forms in inlet only.

Flowing sound of refrigernat is
not heard and there is no
frost.

TEMPERATURE

OF THE

COMPRESSOR

A little higher than
ambient
temperature.

Equal to ambient
temperature.

A little higher than
ambient
temperature.

Equal to ambient
temperature.

Lower than ambient
temperature.

Alittle higher than
ambient
temperature.

Equal to ambient
temperature

REMARKS

- Refrigerant level is low due to a
leak.

¥

- Normal cooling is possible by
restoring the normal amount of

¥

refrigerant and repairing the leak.

¥

- No discharging of refrigerant.

- Normal cooling is possible by
restoring the normal amount of

¥

refrigerant and repairing the leak.

¥

- Normal discharging of the
refrigerant.

¥

- The capillary tube is faulty.

- Normal discharging of the
refrigerant.

¥

- Cooling operation restarts when
heating the inlet of the capillary

¥

tube.

¥

- Low pressure at high side of
compressor due to low

¥

refrigerant level.

¥

- Nopressure in the high pressure
part of the compressor.

¥
¥

- 14 -

6-5-1 SEALED SYSTEM DIAGNOSIS

All components operating, No airflow problems, Not frosted up as a defrost problem

Not Cooling Complaint

problem has been isolated to sealed system area

Very Fast

Inefficient

Compressor

Partial

Equalization

Test

Fast

Condenser

Temperature

Room Temperature

Pattern?

Partial

Restriction

Hotter than Normal

Frost

None

Equalization

Test

Very SlowVery Slow

Very Fast

Complete

Restriction

Cap Tube

Sound

Faint

None to Weak

Air/Low Side

Leak

Trace of Oil

Yes

No

Leak

Undercharge

(The equalization test is trying to restart a compressor after it has been operating.)

Loss of Change

Compressor Not

Pumping

- 15 -

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICE MAKER

7-1 OPERATION PRINCIPLE

7-1-1 Operation Principle of Ice Maker

Power On

Start Position

Icemaking

Mode

Harvest

Mode

Fill

Park Position

Test Mode

Adjusts Ejector to Start Position with power on.

•

Waits until water becomes cold after starting the

Icemaking operation.

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

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

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

• To operate LINE and SERVICE, press and hold the Cube Size button

for 3 seconds. The icemaking will run through 3 stages:
Harvest Fill Icemaking.

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

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

Cube Size button

Power (On/Off) Switch

- 16 -

7-2 ICE MAKER FUNCTIONS
7-2-1 Ice Making Mode

1. Icemaking refers to the freezing of supplied water in the ice trays. Complete freezing is assured by measuring the
temperature of the Tray with icemaking SENSOR.

2. Icemaking starts after completion of the water fill operation.

3. The icemaking function is completed when the sensor reaches -7°C, 60 to 240 minutes after starting.

NOTE : After icemaker power is ON, the icemaker heater will be on for test for 9 sec.

7-2-2 Harvest Mode

1. Harvest (Ice removing) refers to the operation of dropping ices into the ice bin from the tray when icemaking has
completed.

2. Harvest mode:
(1) The Heater is ON for 30 seconds, then the motor starts.
(2) Harvest mode is completed if it reaches start position again while Heater & Motor are on at the same time.

A. ice bin is full : The EJECTOR stops (heater off).
B. ice bin is not full : The EJECTOR rotates twice to open for ice.

NOTE : If the EJECTOR does not rotate once within 5 minutes in status (2), separate heater control mode starts

operating to prevent the EJECTOR from being constrained. (It is recommended that the user open for ice to
return to normal mode.)

7-2-3 Fill/Park Position

1. Once a normal harvest mode has been completed, the water solenoid will be activated.

2. The amount of water is adjusted by pressing the fill key repeatedly. This changes the time allowed for fill as illustrated in
the table below.

Water supply amount table

STAGE TIME TO SUPPLY INDICATIONS REMARKS

1

2

3

6 sec.

7 sec.

8 sec.

The water amount will vary depending
on the water control switch setting, as
well as the water pressure of the
connected water line.

- 17 -

7-2-5 Function TEST

1. This is a compulsory operation for test, service, cleaning, etc. It is operated by pressing and holding the Cube Size button for 3 seconds.

2. The test works only in the Icemaking Mode. It cannot be entered from the Harvest or Fill mode. (If there is an ERROR, it
can only be checked in the TEST mode.)

3. Caution! If the test is performed before water in the icemaker is frozen, the ejector will pass through the water. When the fill
mode begins (Stage 4), unless the water supply has been shut off, added water will overflow into the ice bin. If the control
Doesn’t operate normally in the TEST mode, check and repair as needed.

4. After water is supplied, the normal CYCLE is followed: icemaking Harvest Fill Park Position.

5. Five seconds after Stage 5 is completed, the icemaker returns to MICOM control. The time needed to supply water
resets to the pre- test setting.

Diagnosis TABLE

STAGE ITEMS INDICATOR REMARKS

1

2

3

4

5

6

HEATER

MOTOR

HALL IC

(TRAY)

SOLENOID VALVE

HALL IC
(LEVER)

Reset

Return to Status prior to
TEST MODE

*

Five seconds after heater starts, heater will
go off if temperature recorded by sensor is
10°C (50°F)or lever is in up position.

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

You can confirm Hall IC detection of position.

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

You can check when the Hall IC is sensing a full
ice condition. (If there is a water fill error, the
fifth LED is not on.)

Five seconds after fifth stage is completed,
the icemaker resets to initial status.

7-3 DEFECT DIAGNOSIS FUNCTION

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

- 18 -

PROBLEM

None

operates properly

Make sure that the wire

on each sensor is

HALL IC/MOTOR/

HEATER/RELAY

NO DIVISION INDICATOR REMARKS

1

2

3

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

*

Normal

Icemaking

Sensor

malfunction

Icemaker Kit

malfunction

Note fill times
(see previous page)

Open or shorted wire or sensor

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

Display switch

connected.

Check

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

8-1 FUNCTION

8-1-1 Function

1. When the appliance is plugged in, it is set to "4" for Refrigerator and "4" for freezer.
You can adjust the Refrigerator and the Freezer control temperature by pressing the ADJUST button.

2. When the power is initially applied or restored after a power failure, it is automatically set to "4" & "4".

8-1-2 Control of freezer fan motor

1. Freezer fan motor has high and standard RPMs.

2. High RPM is used when electricity is first on, for ICE PLUS , and when refrigerator is overloaded.
But standard RPM is used for general purposes.

3. To improve cooling speed and load corresponding speed, the RPM of freezer fan motor shall change from normal speed
to hign speed.

4. High speed (2500RPM) : Initial power on or load corresponding operation, ICE PLUS.
Normal speed ( 2200 RPM): general working conditions.

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

8-1-3 ICE PLUS

1. The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice.

2. Whenever selection switch is pressed, selection/release, the LED will turn ON or OFF.

3. If there is a power cut and the refrigerator is power on again, ICE PLUS function will be canceled.

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

activated for 24 hrs. The first three hours the compressor and ICE PLUS will be ON. The next 21hours the freezer will
be controlled at the lowest temperature. After 24 hours or if the ICE PLUS key is pressed again, the freezer will
return to its previous temperature.

5. For the first three hours notice the following cases:

(1) Compressor and freezer fan(HIGH RPM) continuously operate for three hours.
(2) If defrost starts during ICE PLUS, ICE PLUS operates for the rest of time after defrost is

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

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

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

(4) If ICE PLUS is selected within seven minutes after compressor has stopped, the compressor (compressor

delays seven minutes) shall start after the balance of the delay time.

(5) The fan motor in the freezer compartment rotates at high speed during ICE PLUS.

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

8-1-4. REFRIGERATOR LAMP AUTO OFF

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

- 19 -

8-1-5 Alarm for Open Door

1. This feature sounds a buzzer when the freezer or refrigerator door is not closed within 1 minute after it is opened.

2. One minute after the door is opened, the buzzer sounds three times each for 1/2 seconds. These tones repeat every 30
seconds.

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

Freezer Door

or Refrigerator

Door

Buzzer

Closed Open Closed Open

Within 1 min. 1 min.

3 Times 3 Times 3 Times 3 Times

30 sec 30 sec 30 sec

Closed

8-1-6 Buzzer Sound

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

8-1-7 Defrosting (removing frost)

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

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

3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn’t reach 46.4°F(8°C) in
2 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function, 8-1-9.)

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

8-1-8 Electrical Parts Are Turned On Sequentially

Electrical parts such as COMP, defrosting heater, freezer FAN, etc. are turned on in the following order to prevent noise and
parts damage. Several parts are started at the same time at initial power on and are turned off together when TEST is
completed.

OPERATING ORDERS

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

Initial power on

purchased or when moved)

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

Reset to normal operation
from TEST MODE

POWER

in 1/2 second in 1/2 second

ON

POWER

in 1/2 second

ON

in 1/2 second in 1/2 second

COMP

COMP

ON

Defrosting

heater ON

ON

Total load

OFF

in 7 minute

- 20 -

COMP

ON

Freezer FAN

in 10 second

Freezer FAN

ON

in 1/2 second

ON

Defrosting

heater OFF

Freezer FAN

ON

8-1-9 Defect Diagnosis Function

1. Automatic diagnosis makes servicing the refrigerator easy.

2. When a defect occurs, the buttons will not operate; but the tones. such as ding. will sound.

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

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

ERROR CODE on display panel

NO ITEM

Failure of freezer

1

sensor
Failure of

2

Refrigerator sensor
Failure of defrost

3

sensor

Poor of defrost

4

Failure of BLDC fan

5

motor at freezing
compartment

All off

All off

All off

All off

All off

LED OFF LED ON

ERROR CODE

CONTENTS REMARKS

Cut or short circuit wire

Cut or short circuit wire

Cut or short circuit wire

2 hours later after

wires on each sensor

heater or Temperature

starting defrost, If
sensor doesn’t be

Connector (indicated

over 46ºF (8ºC)

If there is no fan motor
signal, for more than

65 seg. in operation
fan motor.

Poor motor, hocking to
wires of fan, contact of

structures to fan,

snapping or short of lead

Inspect Connecting

Snapping of defrost

fuse, pull-out of

minimum 2 Hours

after failure occurs)

- 21 -

8-1-10 TEST Mode

1. The Test mode allows checking the PCB and the function of the product as well as finding out the defective part in case of
an error.

2. The test mode is operated by pressing two buttons at Display panel.

3. While in the test mode, the function control button is not recognized, but the recognition tone (beep~) sounds.

4. After exiting the test mode, be sure to reset by unplugging and then plugging in the appliance.

5. If an error, such as a sensor failure, is detected while in the test mode, the test mode is cleared and the error code is
displayed.

6. While an error code is displayed, the test mode will not be activated.

MODE MANIPULATION CONTENTS REMARKS

TEST1

TEST2

Reset

NOTE : LED CHECK MODE: When the refrigerator temperature control and the freezer temperature control button at the

same time are hold for 1 second or longer, every LED on the display turns on at the same time. when the button are
relesed, the previous mode is restored.

Push ULTRA ICE
key and ADJUST key of
Freezer Temperature at the
same time over 3
seconds.

Push ULTRA ICE
key and ADJUST key of
Freezer Temperature at the
same time over 3 seconds
in TEST MODE 1

Push ULTRA ICE
key and ADJUST key of
Freezer Temp. at the same
time over 3 seconds. in
TEST MODE 2

1. Continuous operation of the
COMPRESSOR

2. Continuous operation of the freezer fan

3. STEPPING DAMPER OPEN

4. Defrosting Heater OFF

5. Every DISPLAY LED ON

1. COMP OFF

2. Freezer FAN OFF

3. STEPPING DAMPER CLOSE

4. Defrosting heater ON

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

Reset to the previously setting before
TEST MODE

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

The compressor will
Start after a 7-minute
delay.

* Freezer Fan RPM Variable Check:

In case the freezer fan is in operation when the ADJUST key in Refrigerator and Freezer Temp. Control are pressed for
more than one second at the same time freezer fan RPM changes. (for example if high speed, to normal speed or if
normal speed, to high speed for 30 seconds)
After 30 seconds, it turns to its original RPM.

* Demonstration MODE:

1. When the ULTRA ICE key and ADJUST key of refrigerator temperature control are pressed for more than 3 seconds at the
same time temperature’s it converts to demostration mode..

2. In this status, each LED is rotated with 1 second interval.

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

4. It reset if you do again as clause.

- 22 -

8-2 PCB FUNCTION

8-2-1 Power Circuit

The secondary part of the TRANSFORMER is composed of the power supply for the display, the BLDC FAN Motor drive
(15.5 V), the relay drive (12 Vdc) and the MICOM and IC (5 Vdc).

The voltage for each part is as follows:

PART VA 1 CE 3 CE 4 CE 5

VOLTAGE 115 Vac 12 Vdc 15.5 Vdc 5 V

VA1 is a part for preventing over voltage and noise. When 385V or higher power is applied, the inside elements are short­circuited and broken, resulting in blowout of the fuse in order to protect the elements of the secondary part of the
TRANSFORMER.

- 23 -

8-2-2 Oscillation Circuit

This circuit generates the base clock for calculating time and the synchro clock for transmitting data from and to the inside
logic elements of the IC1 (MICOM). Be sure to use specific replacement parts, since calculating time by the IC1 may be
changed. If changed, the OSC1 SPEC will not work.

8-2-3 Reset Circuit

The RESET circuit allows all the functions to start at the initial conditions by initializing various parts, including the RAM
inside the MICOM (IC1) when the power is initially supplied or the power supply to the MICOM is restored after a
momentary power failure. For the initial 10ms of power supply, LOW voltage is applied to the MICOM RESET terminal.
During a normal operation, 5V is applied to the RESET terminal. (If a malfunction occurs in the RESET IC, the MICOM will
not operate.)

- 24 -

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

1. Load Drive Condition Check

G5SB-14

FREEZER DOOR

SWITCH

REFRIGERATOR

DOOR SWITCH

LOAD TYPE

Measurement Location (IC6)

ON

Condition

OFF

COMP

DEFROSTING

HEATER

LAMP

TCM

POWER MODE

(OPTIONAL)

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

1V or below

12V

VALVE

(DISPENSER

MDL)

2. Fan motor driving circuit (freezing compartment fan)

1. This circuit makes standby power 0 by cutting off power supplied to ISs inside of the fan motor in the fan motor OFF.

2. This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7.5V ~ 16V to motor.

3. This circuit prevents over-driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by
sensing the operation RPM of the fan motor.

part part part

a b

c

MOTOR OFF 2V or less 0V 5V

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

- 25 -

3. Buzzer Drive Condition Check

Condition

Measure-

Tone (Ding~Dong~) when the button on

the display is pushed.

Alarm for open door

(beep-beep-beep)

ment Location

0.05 s

IC1 ( ) 0 V

A

IC1 ( ) 0 V

B

5 V

0 V

5 V
0 V

2.63 kz (

Ding~)

0.1 s0.2 s 2 s

2.21 kz (

Dong~)

5 V

0 V

5 V
0 V

0.5 s 0.5 s

2.63 kz (Beep~)

OFF

4. Open Door Detection Circuit Check

FREEZER DOOR
SWITCH

OFF

Measurement
Freezer/
Refrigerator Door

Closed 5 V

Open 0 V

Location

(PIN NO.63 & PIN NO.8)

- 26 -

REFRIGERATOR DOOR
SWITCH

8-2-5 Temperature Sensor Circuit

FREEZER-SENSOR

REFRIGERATOR-SENSOR

DEFROST-SENSOR

The upper CIRCUIT reads REFRIGERATOR temperature, FREEZER Temperature, and DEFROST-SENSOR temperature
for defrosting and the indoor temperature for compensating for the surrounding temperature into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows:

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

Freezer Sensor POINT Voltage

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

Defrosting Sensor POINT Voltage

A

B

C

SHORT-CIRCUITED

8-2-6 Refrigeration Compartment Stepping Motor Damper Circuit

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

1
2

3

OPEN

- 27 -

8-2-7 Temperature Compensation & Overcooling/Undercooling Compensation Circuit

1. Refrigerator Temperature Compensation

Refrigerator

Resistance Temperature Remark

(RCR) Compensation

180 K +2.5°C Compensation by

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

8.2 K -0.5°C Compensation by

5.6 K -1.0°C

3.3 K -1.5°C
2 K -2.0°C

470 -2.5°C

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

Revised resistance

Present resistance

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

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

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

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

8.2k Down Down Down Down Change Up Up Up Up Up Up

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

(RCR) 10k Down Down Down Down Down Change Up Up Up Up Up

12k Down Down Down Down Down Down Change Up Up Up Up
18k Down Down Down Down Down Down Down Change Up Up Up
33k Down Down Down Down Down Down Down Down Change Up Up
56k Down Down Down Down Down Down Down Down Down Change Up

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

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

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

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

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

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

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

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

raising the

temperature

Standard Temperature

lowering the
temperature

Table of Temperature Compensation by adjusting the
resistance (difference from the current temperature)

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

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

refrigerator temperature, which is different in each model.

- 28 -

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

The circuit shown above determines whether a function control key on the operation display is pushed. It also turns on the
corresponding function indication LED DISPLAY. The drive type is the scan type.

150J

- 29 -

8-3 RESISTANCE SPECIFICATION OF SENSOR

TEMPERATURE DETECTED RESISTANCE OF FREEZER

BY SENSOR SENSOR

- 20° C 22.3 K 77 K

- 15° C 16.9 K 60 K

- 10° C 13.0 K 47.3 K

- 5° C 10.1 K 38.4 K
C 7.8 K 30 K

0°

+ 5 °C 6.2 K 24.1 K

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

?

? ?

? ?

?

? ?

?

? ?

? ?

?

?

?

? ?

?

RESISTANCE OF REFRIGERATOR &

DEFROST SENSOR & ROOM SENSOR

?

?

?

?

?

?

?

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

- Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature.
This delay is necessary due to sensor response speed.

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

- 30 -

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

is poor.

POWER SOURCE 1.

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

8-4 TROUBLESHOOTING

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

TEMPERATURE is operates. (forced COOLING).

incorrect CONNECTING WIRE is poor. Certify the MOTOR and the

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

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

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

the door is closed.

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

is normal. of the Refrigerator poor.

is normal. sticking on the EVAPORATOR . is poor.

SENSOR.

. sticking on EVAPORATOR replace any lost refrigerant.

don’t press the KEY and poor.

and the surface temperature

of the condenser pipe.

wait. THE CONNECTING WIRE Check the connection of the

operate.

(forced COOLING).

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

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

abnormally CONNECTOR. TRANS FUSE is open. Replace TRANS.

2.

DISPLAY operates the MAIN PWB CONNECTOR. is poor.

DISPLAYis off.

The whole DISPLAY

LED/SEVEN SEGMENT

DISPLAY LED/

SEVEN SEGMENT

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

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

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

REFRIGERATOR. REFRIGERATOR DOOR IS

OPEN and check display.

is poor. black wire of the MAIN PWB

connection of the black wire

of the MAIN PWB

CONNECTOR (CON2).

CONNECTOR (CON2).

blocked.

- 31 -

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

poor. (forced DEFROSTING).

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

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

PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION

TEMPERATURE isn ormal. TEMPERATURE is too low. DOOR isattached.

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

DEFROSTING. SENSOR is connected. DEFROST-SENSOR.

Make sure that FREEZER /

REFRIGERATOR DOOR is closed.

DOOR does not close Reassemble DOOR.

properly. Replace GASKET.

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

blocked. Check HEATER PLATE

TEMPERATURE FUSE Replace TEMPERATURE

disconnection. FUSE.

DEFROST-SENSOR is poor. Replace DEFROST-SENSOR.

HEATER RELAY is poor. Replace RY3 of MAIN PWB.

Connection is poor. Check EVAPORATOR

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

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

REFRIGERATOR.

door is closed.

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

sufficient. sufficient by touching the is blocked.

connection and wire of MAIN

resistance.

PWB CONNECTOR.

- 32 -

8-5 MAIN PWB ASSEMBLY AND PARTS LIST
8-5-1 Main PWB Assembly

- 33 -

8-5-2 Replacement Parts List

- 34 -

8-5-3 PWB Assembly, Dysplay and Parts List

- 35 -

8-6 PWB DIAGRAM

8-6-1 PWB Main Assembly

RY5
G5S-1A

- 36 -

- 37 -

#EV#

EXPPLODED VIEW

CASE PARTS

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

412D

S38

619B

411A

501A

318A

105A

317A

501F

304A

103A

327A

103B

282H

128F

282E

903D

903E

610A

281A

610A

145B

281B

406B

125D

B01

128E

283B

503D

158A

B01

283D

409B

282B

282C

503C

106B

410A

409D

503G

503F

282F

145A

503E

120B

S01

301A

401A

314A

328A

319C

307A

312A

420A

308A

329C

319A

305C

309A

305B

310A

323B

410G

106A

305B

105F

305C

- 38 -

315A

106A

409B

158E

S22

405A

284D

418A

135C

903B

319E

405F

332A

404A

903A

405C

405G

329A

903B

103C

#EV#

FREEZER PARTS

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

131A

149A

136C

- 39 -

#EV#

REFRIGERATOR PARTS

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

140E

S24

140B

142E

143E

140D

140B

S24

143F

140E

S24

140B

142D

143E

140E

140D

S24

140B

S24

143E

140D

S24

128B

103E

128A

103E

170A

103E

151A

103E

167B

154A

151A

155B

151C

- 40 -

#EV#

DOOR PARTS

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

241A

233A

241B

281E

230A

231A

286A

212G

241C

241D

241E

205D

212J

244E

244A

286A

243A

S27

200A

203A

201A

281E

212J

212A

286A

243A

283F

S27

- 41 -

#EV#

WATER and ICE MAKER PARTS

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

S28

602A

600A

600C

618A

616E

627A

623C

S29

262D

622B

619A

619C

S31

- 42 -

MFL62526001

May, 2009