PARTS IDENTIFICATION ....................................................................................................................................................... 4
DOOR SWITCH.................................................................................................................................................................... 5
FAN AND FAN MOTOR........................................................................................................................................................ 6
DEFROST CONTROL ASSEMBLY...................................................................................................................................... 6
CONTROL BOX-REFRIGERATOR ...................................................................................................................................... 6
MULTI DUCT........................................................................................................................................................................ 6
TO REMOVE THE COVER PTC...........................................................................................................................................8
COMPRESSOR AND ELECTRIC COMPONENTS ........................................................................................................... 10
PTC AND OLP.................................................................................................................................................................... 11
OTHER ELECTRICAL COMPONENTS ............................................................................................................................. 12
SERVICE DIAGNOSIS CHART.......................................................................................................................................... 13
OPERATION PRINCIPLE & REPAIR METHOD OF ICEMAKER .................................................................................. 16-19
DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ............................................................................................... 20-35
EXPLODED VIEW & REPLACEMENT PARTS LIST ..................................................................................................... 36-49
SAFETY PRECAUTIONS
Please read the following instructions before servicing your
refrigerator.
1. Check the refrigerator for electrical faults.
2. To prevent electric shock, unplug before servicing.
3. Always check line voltage and amperage.
4. Use standard electrical components.
5. Don't touch metal products in the freezer with wet
hands. This may cause frostbite or cause your skin to
freeze and stick to the surfaces inside the freezer.
6. Prevent water from flowing onto electric elements in the
mechanical parts.
7. Close the top door before opening the bottom door.
Otherwise, you might hit your head when you stand up.
8. When tilting the refrigerator, remove any materials on
the refrigerator, especially the glass shelves and stored
foods.
9. When servicing the evaporator, wear cotton gloves.
This is to prevent injuries from the sharp evaporator
fins.
10. Disassembly, repair, and servicing the sealed
refrigeration system should be performed only by
qualified and certified personnel. Refrigerant should
not be vented into the atmosphere; proper recovery
equipment should be used.
1. SPECIFICATIONS
19 cu. ft. / 22 cu. ft.
ITEMSSPECIFICATIONS
DOOR DESIGNSide Rounded
3
/
4 X 67
20cu.ft)
7
/
8 (WXDXH) 20cu.ft
DXH) 22cu.ft
DIMENSIONS (inches)
29 7/
8 X 31
7
/8 X 31 3/4 X 68 1/2 (WX
32
238.4 (
NET WEIGHT (pounds)
246.9 (
22cu.ft)
COOLING SYSTEMFan Cooling
TEMPERATURE CONTROLMicom Control
Full Automatic
DEFROSTING SYSTEM
Heater Defrost
DOOR FINISHEmbossed Metal, VCM, Stainless
HANDLE TYPEBar
INNER CASEABS Resin
INSULATIONPolyurethane Foam
ITEMSSPECIFICATIONS
VEGETABLE TRAYOpaque Drawer Type
COMPRESSORPTC Starting Type
EVAPORATORFin Tube Type
CONDENSERWire Condenser
REFRIGERANTR-134a (115 g)
LUBRICATING OILFreol @ 10G (310 cc)
DEFROSTING DEVICESHEATH HEATER
REFRIGERATOR60 W (2EA)
LAMP
FREEZER40 W (1EA)
- 3 -
2. PARTS IDENTIFICATION
Digital Sensor
Control
Refrigerator Light
Shelves
Egg Box
Snack Pan
Optibin Crisper
Keeps fruits and
vegetable fresh
and crisp
Triple Twist
Ice Tray
Ice Bin
Durabase
Divider
Freezer Door
Rack (Tilting)
Basket Wire
Freezer Light
Refrigerator
Door Rack
Adjustable
Door Bin
Dairy Bin
- 4 -
3. DISASSEMBLY
BOLT
HINGE
HINGE COVER
GASKET
LOWER HINGE
BOLT
DOOR SWITCH
LEAD WIRE
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.
Figure 1
3. Pull out the door gasket to remove from the door foam
assembly.
● Freezer Door
1. Loosen the hexagonal bolts attaching the lower hinge to
the body to remove the refrigerator door only.
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
Figure 4
- 5 -
3-3 FAN AND FAN MOTOR
- 6 -
BRACKET
MOTOR
GRILLE
FAN MOTOR
FAN
GRILLE ASSEMBLY
DEFROST-CONTROL
ASSEMBLY
CONTROL BOX
COVER LAMP
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.
Figure 5
3-4 DEFROST CONTROL ASSEMBLY
Defrost Control assembly consists of Defrost Sensor and
FUSE–M.
The Defrost Sensor works to defrost automatically. It is
attached to the metal side of the Evaporator and senses its
temperature. At 72°C, it turns the Defrost Heater off.
Fuse-M is a safety device for preventing over-heating of
the Heater when defrosting.
1. Pull out the grille assembly. (Figure 6)
2. Separate the connector with the Defrost Control
assembly and replace the Defrost Control assembly
after cutting the Tie Wrap. (Figure 7)
3-5-1 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 40-watt appliance bulb.
4. Plug in refrigerator or reconnect power.
3-6 CONTROL BOX-REFRIGERATOR
1. First, remove all shelves in the refrigerator, than remove
the Refrigerator control Box by loosening 2 screws.
Figure 10
3-5 LAMP
Figure 6
Figure 7
Figure 8
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 11
4. ADJUSTMENT
PTC STARTER
SEALED
TERMINAL
COMPRESSOR
MOTOR
C
M
S
M
3
6
5
2
S
PTC
N
L1
OVERLOAD PROTECTOR
Resistance Starter Capacitor Running
4-1 COMPRESSOR
4-1-1 Role
The compressor intakes low temperature and low pressure
gas from the evaporator of the refrigerator and compresses
this gas to high-temperature and high-pressure gas. It then
delivers the gas to the condenser.
4-1-2 Composition
The compressor includes overload protection. The PTC
starter and OLP (overload protector) are attached to the
outside of the compressor. Since the compressor is
manufactured to tolerances of 1 micron and is hermetically
sealed in a dust and moisture-free environment, use
extreme caution when repairing it.
4-1-3 Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) If compressor is dropped or handled carelessly, poor
operation and noise may result.
(3) Use proper electric components appropriate to the
Particular Compressor in your product.
(4) Keep Compressor dry.
If the Compressor gets wet (in the rain or a damp
environment) and rust forms in the pin of the Hermetic
Terminal, poor operation and contact may result.
(5) When replacing the Compressor, be careful that dust,
humidity, and soldering flux don’t contaminate the inside
of the compressor. Dust, humidity, and solder flux
contaminate the cylinder and may cause noise,
improper operation or even cause it to lock up.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic
material consisting of BaTiO
(2) The higher the temperature is, the higher the resistance
value. These features are used as a starting device for
the Motor.
4-2-2 Role of PTC-Starter
(1) The PTC is attached to the Sealed Compressor and is
used for starting the Motor.
(2) The compressor is a single-phase induction motor.
Durign the starting operation, the PTC allows current
flow to both the start winding and main winding.
4-2-3 PTC-Applied Circuit Diagram
● Starting Method for the Motor
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
3.
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)
Part
Customer part
number
Lot code/
date code
330 FBYY-S1 BOX98
12345678
Physical
termination
part number
Electrical
characteristics
part number
No. Name
Base, phenolic
(UL 94 V-0 rated)
Movable arm support, plated steel
Stationary contact support,
plated steel
Heater support, plated steel
Heater, resistance alloy
Disc, thermostatic alloy
Movable arm, spring temper
copper alloy
Contact, movable, silver on copper
Contact, stationary, silver on copper
Slug, plated steel
Cover, polyester
(UL 94 V -0 rated)
Pin connector, plated copper alloy
(To engage 2.33/2.66 mm dia. pin)
Quick-connect terminal, brass,
conforms to UL 310, MEMA
DC-2, DIN 46344
(OVERLOAD PROTECTOR cross section)
1
2
4-3-1 Definition of OLP
(1) OLP (OVERLOAD PROTECTOR) is attached to the
Compressor and protects the Motor by opening the
circuit to the Motor if the temperature rises and
activating the bimetal spring in the OLP.
(2) When high current flows to the Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects the Motor by cutting off the
current flowing to the Compressor Motor.
4-3-2 Role of the OLP
(1) The OLP is attached to the Sealed Compressor used
for the Refrigerator. It prevents the Motor Coil from
being started in the Compressor.
(2) For normal operation of the OLP, do not turn the Adjust
Screw of the OLP in any way.
4-4 TO REMOVE THE COVER PTC
1) Remove the Cover Back M/C.
(2) Remove the screw on Cover PTC.
Figure 13
(3) Remove two Housings on upper part of Cover PTC.
(4) Take out the cover PTC from upper to lower position
like .
(5) Turn 45° in the direction of and take it out.
(6) Assembly in reverse order of disassembly.
- 8 -
5. CIRCUIT DIAGRAM
3854JK1004D
BETTER / GOOD
- 9 -
6. TROUBLESHOOTING
1
2
3
4
5
2
5
5
3
5
4
5
5
1
43
YES
YES
The range of resistance is between 1~50Ω (OK)
Not open
4.5~9 Ω
Open or short
Open or short
Open
YES
YES
NO
NO
NO
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
Power Source.
Remove PTC-Starter
from Compressor and
measure voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.
No Voltage.
Applied voltage isn't
in range of Rating
Voltage ±10%.
(Reated Voltage
±10%)?
OLP disconnected?
Advise customer that
power supply needs to be
checked by an electrician.
Replace OLP.
Check connection
condition.
Reconnect.
Check
resistance of
Motor
Compressor.
Check
resistance of
PTC-Starter.
Check resistance
between M-C, S-C and
M-S in Motor
Compressor.
Check resistance of
two terminals in
PTC-Starter.
Replace
Compressor.
Replace
PTC-Starter.
Check OLP.
Check
starting state.
Check resistance of two
terminals in OLP.
Check the power supply
under load.
(Compressor attempting
to re-start after being off
for 5 minutes).
Supply
voltage rating
with ±10%.
Replace OLP.
Did
compressor
start?
Compressor
is OK
Replace the
compressor
- 10 -
6-2 PTC AND OLP
65
Shows continuity
Open
Normal operation of
Compressor is
impossible or poor.
Separate PTC-Starter
from Compressor and
measure resistance
between No. 5 and 6
of PTC-Starter with a
Tester.
(Figure 14)
Separate OLP from
Compressor and check
resistance value
between two terminals
of OLP with a Tester.
(Figure 15)
Observation value is
115V/60Hz : 6.8Ω±30%
The resistance value
is 0Ω (short) or
∞ (open).
Check another
electric component.
Replace OLP.
Replace PTCStarter.
Figure 14
Figure 15
- 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
COMPLAINTPOINTS TO BE CHECKEDREMEDY
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 Drip Tray is not firmly fixed.
• Check if the cover of the compressor enclosure
in the lower front 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 Drip Tray 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
YES
YES
▼ Troubleshooting Chart
CAUSE
PARTIALFreezer Low flowing sound ofA little higher• Refrigerant level is low due
LEAKAGEcompartment and Refrigerant is heard andthan ambient• to a leak.
LEAKAGE
COMPLETE Freezer Flowing sound of refrigerantEqual to ambient• No discharging of Refrigerant.
LEAKAGEcompartment andis not heard and frost isn'ttemperature.• Normal cooling is possible by
CLOGGED BY DUST
PARTIALFreezer Flowing sound of refrigerantA little higher• Normal discharging of the
CLOGcompartment andis heard and frost formsthan ambient • refrigerant.
WHOLE
CLOG
MOISTURECooling operationFlowing sound of refrigerantLower than• Cooling operation restarts
CLOGstops periodically.is not heard and frost melts.ambient• when heating the inlet of the
COMPRESSION
COMP-Freezer andLow flowing sound ofA little higher• Low pressure at high side
DEFECTIVE
RESSIONRefrigeratorrefrigerant is heard andambient• of compressor due to low
STATE OF
THE UNIT
Refrigerator don't frost forms in inlet only.temperature.• Normal cooling is possible by
cool normally.• restoring the normal amount of
Refrigerator don't formed.• restoring the normal amount of
cool normally.• refrigerant and repairing the leak.
Refrigerator don't in inlet only.temperature.• The capillary tube is faulty.
cool normally.
Freezer
compartment and
Refrigerator don't cool.
don't cool.frost forms in inlet only.temperature.• refrigerant level.
STATE OF THE
EVAPORATOR
Flowing sound of refrigerantEqual to ambient• Normal discharging of the
is not heard and frost isn'ttemperature.• Refrigerant.
formed.
TEMPERATURE
OF THE
REMARKS
COMPRESSOR
• refrigerant and repairing the leak.
temperature.• capillary tube.
NO COMP-No compressingFlowing sound of refrigerantEqual to ambient• No pressure in the high
RESSIONoperation.is not heard and there istemperature.• pressure part of the
no frost.• compressor.
▼ Leakage Detection
● Observe the discharging point of the refrigerant, which may be in the oil discharging part of the compressor and in a hole
in the evaporator.
Check if compressor
runs.
Frost formed normally
Moisture Clog
Faulty
Compressor.
Check Compressor
Check if frost
forms in
Evaporator.
Normal amount
Clogged by dust.Gas leakage.
No frost
or frost forms
in inlet only
Observe the discharged
amount of Refrigerant.
Inject refrigerant in compressor
and check cooling operation.
Frost formed normally
Check if oil
leaks.
None or too much
(Find the leak and repair it)
- 14 -
▼ General Control of Refrigerating Cycle
NO.ITEMSUNITSTANDARDSPURPOSESREMARKS
Pipe and
1
piping system
opening time
Welding
2
N
2 sealed
3
parts
Refrige-
4
ration
Cycle
Evacuation
time
Vacuum
degree
Vacuum
Vacuum
piping
Min.
Nitrogen
pressure
Confirm
N
2 leak
Min.
Torr
EA
EA
Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
Weld under Nitrogen
atmosphere.
(N
2 pressure:
0.1~0.2 kg/cm
2
)
Confirm the sound of
pressure relief when
removing the rubber cap.
Sound: usable
No sound: not usable
More than 40 minutes
Below 0.03 (ref)
High and low pressure sides
are evacuated at the same
time for models above 200 l.
Use R-134a manifold
exclusively.
To protect
moisture
penetration.
To protect oxide
scale formation.
To protect
moisture
penetration.
To remove moisture.
To protect mixing
of mineral and
ester oils.
The opening time should be reduced
to a half of the standards during rain
and rainy seasons (the penetration of
water into the pipe is dangerous).
- Refer to repair note in each part.
- R-134a refrigerant is more
susceptible to leaks than R-12 and
requires more care during welding.
-
Do not apply force to pipes before and
after welding to protect pipe from cracking.
- In case of evaporator parts, if it doesn't
make sound when removing rubber
cap, blow dry air or N
2 gas for more
than 1 min. and than use the parts.
Note: Only applicable to the model
equipped with reverse flow
protect plate.
Vacuum efficiency can be improved
by operating compressor during
evacuation.
The rubber pipes for R-12 refrigerant
will be melted when they are used for
R-134a refrigerant (causes of leak.)
Refrigerant
5
weighing
Drier
6
replacement
Leak check
7
Pipe
coupler
Outlet
(Socket)
Plug
EA
EA
Use R-134a manifold
exclusively.
R-134a manifold exclusively.
R-134a manifold exclusively.
Use R-134a exclusively.
Weighing allowance: ±5g
Note: Winter: -5g
- Do not use soapy water for
check. It may be sucked
into the pipe by a vacuum.
To protect R-12
refrigerant mixing.
To protect R-12
refrigerant mixing.
To protect R-12
refrigerant mixing.
Do not mix with
R-12 refrigerant.
To remove the
moisture from
pipe inside.
Defect in
refrigerant leak
area.
- Do not weigh the refrigerant at too
hot or too cold an area.
(77°F [25°C] is adequate.)
- Make Copper charging canister
(Device filling refrigerant)
Socket: 2SV Plug: 2PV R-134a
Note: Do not burn O-ring (bushing)
during welding.
- Check for an oil leak at the refrigerant
leak area. Use an electronic leak
detector if an oil leak is not found.
- The electronic leak detector is very
sensitive to halogen gas in the air. It
also can detect R-141b in urethane.
Practice many times before using this
type of detector to avoid false readings.
- 15 -
7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
BETTER / GOOD MODEL
ADJUST
WARMER
REFRIGERATOR TEMPFREEZER TEMP
4 IS RECOMMENDED
COLDER
EXPRESS
FREEZING
ADJUST
WARMER
4 IS RECOMMENDED
COLDER
7-1 FUNCTION
7-1-1 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".
7-1-2 Control of freezer fan motor
1. Freezer fan motor has high and standard RPMs.
2. High RPM is used when electricity is first on, for express freezing, and when refrigerator is overloaded.
But standard RPM is used for general purposes.
3. To improve cooling speed and load corresponding speed, the RPM of freezer fan motor shall change from normal speed
to hign speed.
4. High speed (2500RPM) : Initial power on or load corresponding operation, express freezing Normal speed (2200RPM) :
General working conditions.
5. Fan motor stops when refrigerator of freezer door opens.
7-1-3 EXPRESS FREEZING
1. The purpose of this function is to intensify the cooling speed of freezer and to increase the amount of ice.
2. Whenever selection switch is pressed, selection/release, the LED will turn ON or OFF.
3. If there is a power cut and the refrigerator is power on again, EXPRESS FREEZING function will be canceled.
4.To activate these function you need to press the Express Freezing key and the LED will turn ON. This function will remain
activated for 24 hrs. The first three hours the compressor and Freezer Fan will be ON. The next 21hours the freezer will
be controlled at the lowest temperature. After 24 hours or if the Express Freezing key is pressed again, the freezer will
return to its previous temperature.
5. For the first three hours notice the following cases:
(1) Compressor and freezer fan(HIGH RPM) continuously operate for three hours.
(2) If defrost starts during EXPRESS FREEZING, EXPRESS FREZZING operates for the rest of time after defrost is
completed, when EXPRESS FREZZING operation time is less than 90 minutes.
If EXPRESS FREZZING operates for more than 90minutes, the EXPRESS FREZZING will operate for two hours after
defrost is completed.
(3) If EXPRESS FREZZING is pressed during defrost, EXPRESS FREZZING LED is on but this function will start seven
minutes after defrost is completed and it shall operate for three hours.
(4) If EXPRESS FREZZING is selected within seven minutes after compressor has stopped, the compressor (compressor
delays seven minutes) shall start after the balance of the delay time.
(5) The fan motor in the freezer compartment rotates at high speed during EXPRESS FREZZING.
6. For the rest of 21 hours, the freezer will be controlled at the lowest temperature.
7-1-4. REFRIGERATOR LAMP AUTO OFF
1. To protect the risk of lamp heat, when Refrigerator door opens for 7 min., refrigerator lamp is auto off.
- 16 -
7-1-5 Alarm for Open Door
ClosedOpenClosedOpen
3 Times3 Times3 Times3 Times
Closed
Within 1 min.1 min.
30 sec30 sec30 sec
Freezer Door
or Refrigerator
Door
Buzzer
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.
7-1-6 Buzzer Sound
When the button on the front Display is pushed, a Ding~ Dong~ sound is produced.
(Refer to the Buzzer Circuit 7-2-4 No. 2)
7-1-7 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, 7-1-9.)
4. Defrosting won’t function if its sensor is defective (wires are cut or short circuited)
7-1-8 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.
OPERATINGORDERS
Temperature of Defrosting
Initial power on
Reset to normal operation
from TEST MODE
Sensor is 45°C or more
(when unit is newly
purchased or when moved)
Temperature of defrosting
sensor is lower than 45°C
(when power cuts, SERVICE)
POWER
in 1/2 secondin 1/2 second
ON
POWER
in 1/2 second
ON
in 1/2 secondin 1/2 second
COMP
ON
Total load
in 7 minute
OFF
COMP
ON
Defrosting
heater ON
COMP
ON
Freezer FAN
in 10 second
Freezer FAN
ON
in 1/2 second
ON
Defrosting
heater OFF
Freezer FAN
ON
- 17 -
7-1-9 Defect Diagnosis Function
Defect code signs Defect code signs
ADJUST
WARMER
REFRIGERATOR TEMPFREEZER TEMP
4 IS RECOMMENDED
COLDER
EXPRESS
FREEZING
ADJUST
WARMER
4 IS RECOMMENDED
COLDER
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
NOITEM
Failure of freezer
1
sensor
Failure of
2
Refrigerator sensor
Failure of defrost
3
sensor
Poor of defrost
4
ERROR CODE
All off
All off
All off
All off
CONTENTSREMARKS
Cut or short circuit wire
Cut or short circuit wire
Inspect Connecting
wires on each sensor
Cut or short circuit wire
Snapping of defrost
2hours later After
starting defrost, If
sensor doesn’t be over
46°F (8°C)
heater or Temperature
fuse, pull-out of
Connector (indicated
minimum 2 Hours
after failure occurs)
- 18 -
7-1-10 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.
MODEMANIPULATIONCONTENTSREMARKS
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 Express Freezing
key and COLDER KEY of
Freezer Temp. at the
same time over 3
seconds.
Push Express Freezing
key and COLDER KEY of
Freezer Temp. at the
same time over 3 seconds
in TEST MODE 1
Push Express Freezing
key and COLDER KEY of
Freezer Temp. at the same
time over 3 seconds. in
TEST MODE 2
1. Continuous operation of the
COMPRESSOR
2. Continuous operation of the freezer fan
3. STEPPING DAMPER OPEN
4. Defrosting Heater OFF
5. Every DISPLAY LED ON
1. COMP OFF
2. Freezer FAN OFF
3. STEPPING DAMPER CLOSE
4. Defrosting heater ON
5. DISPLAY LED 1, 3, 5, 7 ON
Reset to the previously setting before
TEST MODE
Reset if the
temperature of the
Defrosting sensor is
46°F (8°C) or more.
The compressor will
Start after a 7-minute
delay.
* Freezer Fan RPM Variable Check:
In case the freezer fan is in operation when the WARMER KEY in Refrigerator and Freezer Temp. Control are pressed for
more than one second at the same time freezer fan RPM changes. (for example if high speed, to normal speed or if
normal speed, to high speed for 30 seconds)
After 30 seconds, it turns to its original RPM.
* Demonstration MODE:
1. When the KEY of refrigerator Temp. control or of freezer Temp. control is pushed and held over 5 seconds, warmest
temperature’s It converts to Demonstration Mode.
2. In this status, each LED is rotated with 1 second interval.
3. In this status, all Loads are off (Compressor / Fan / Damper / Heater)
(Even is Demonstration Mode, the refrigerator Lamp automatic off function warks normally and can be demonstrated)
4. It reset if you do again as clause.
- 19 -
7-2 PCB FUNCTION
7-2-1 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:
PARTVA 1CE 3CE 4CE 5
VOLTAGE115 Vac12 Vdc15.5 Vdc5 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.
- 20 -
7-2-2 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.
7-2-3 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.)
- 21 -
7-2-4 Load / Buzzer Drive & Open Door Detection Circuit
1. Load Drive Condition Check
LOAD TYPE
Measurement Location (IC4)
ON
Condition
OFF
COMP
NO.11NO.14NO.15NO.12NO.13
DEFROSTING
HEATER
LAMP
1V or below
12V
FREEZER
FAN MOTOR
(HIG RPM)
FREEZER
FAN MOTOR
(LOW RPM)
- 22 -
2. Buzzer Drive Condition Check
0 V
5 V
0 V
5 V
0.5 s0.5 s
2.63 kz (Beep~)
OFF
0.05 s
0.1 s0.2 s2 s
0 V
5 V
0 V
5 V
2.63 kz
(
Ding~)
2.21 kz(
Dong~)
Condition
Measure-
Tone (Ding~Dong~) when the button on
the display is pushed.
Alarm for open door
(beep-beep-beep)
ment Location
IC1 ( )0 V
A
IC1 ( )0 V
B
3. Open Door Detection Circuit Check
OFF
Freezer/
Refrigerator Door
Measurement
Location
Closed5 V
Open0 V
- 23 -
(PIN NO.31 & PIN NO.30)
7-2-5 Temperature Sensor Circuit
The upper CIRCUIT reads REFRIGERATOR temperature, FREEZER Temperature, and DEFROST-SENSOR temperature
for defrosting and the indoor temperature for compensating for the surrounding temperature into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows:
SENSORCHECK POINTNORMAL (-30°C ~ 50°C)
Freezer SensorPOINT Voltage
Refrigerator SensorPOINT Voltage0.5 V ~ 4.5 V0 V5 V
Defrosting SensorPOINT Voltage
A
B
C
SHORT-CIRCUITED
OPEN
- 24 -
7-2-6 Refrigeration Compartment Stepping Motor Damper Circuit
* The circuit shown below is the damper circuit to regulate the refrigerator temperature.
- 25 -
7-2-7 Temperature Compensation & Overcooling/Undercooling Compensation Circuit
➧ 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.
- 26 -
7-2-8 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.
- 27 -
7-3 RESISTANCE SPECIFICATION OF SENSOR
TEMPERATURE DETECTED RESISTANCE OF FREEZER
BY SENSORSENSOR
- 20 ˚C22.3 KΩ77 KΩ
- 15 ˚C16.9 KΩ60 KΩ
- 10 ˚C13.0 KΩ47.3 KΩ
- 5 ˚C10.1 KΩ38.4 KΩ
0 ˚C7.8 KΩ30 KΩ
+ 5 ˚C6.2 KΩ24.1 KΩ
+ 10 ˚C4.9 KΩ19.5 KΩ
+ 15 ˚C3.9 KΩ15.9 KΩ
+ 20 ˚C3.1 KΩ13 KΩ
+ 25 ˚C2.5 KΩ11 KΩ
+ 30 ˚C2.0 KΩ8.9 KΩ
+ 40 ˚C1.4 KΩ6.2 KΩ
+ 50 ˚C0.8 KΩ4.3 KΩ
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.
- 28 -
COOLING is poor.NO COOLING.1. If the COMPRESSORUSE TEST MODE1 COMPRESSOR locked orReplace COMPRESSOR.