PARTS IDENTIFICATION ....................................................................................................................................................... 4
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 ............................................................................................... 20-38
EXPLODED VIEW & REPLACEMENT PARTS LIST ......................................................................................................... 39-
SAFETY PRECAUTIONS
Please read the following instructions before servicing your
refrigerator.
1. Check the refrigerator for current leakage.
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.
6. Prevent water from spiling onto electric elements or the
machine parts.
- 2 -
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 thin plates (ex. glass
shelf or books.)
9. When servicing the evaporator, wear cotton gloves.
This is to prevent injuries from the sharp evaporator
fins.
10. Service on the refrigerator should be performed by a
qualified technician. Sealed system repair must be
performed by a CFC certified technician.
Page 3
1. SPECIFICATIONS
21 cu. ft. / 25 cu. ft.
ITEMSSPECIFICATIONS
DOOR DESIGNSide Rounded
DIMENSIONS (inches)
NET WEIGHT (pounds)
COOLING SYSTEMFan Cooling
TEMPERATURE CONTROLMicom Control
DEFROSTING SYSTEM
DOOR FINISHEmbossed Metal, VCM, Stainless
HANDLE TYPEBar
INNER CASEABS Resin
INSULATIONPolyurethane Foam
35 3/4 X 30
35 3/4
278 (
302 (
Full Automatic
Heater Defrost
X 69
1
/4
X 34
21cu.ft)
25cu.ft)
3
/4 (WX
3
/4
X 69
(WXDXH) 25cu.ft
DXH) 21cu.ft
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 -
Page 4
2. PARTS IDENTIFICATION
Digital Sensor
Control
Refrigerator Light
Shelves
Optibin Crisper
Keeps fruits and
vegetable fresh
and crisp
Customcube
Icemaker
Glide N Serve
Ice Bin
Durabase
Divider
Pull out Drawer
Freezer
Door Rack
(Tilting)
Design-A-Door
Design-A-Door
Wine Holder
Dairy Bin
Egg Box
Design-A-Door
- 4 -
Page 5
3. DISASSEMBLY
HINGE
HINGE COVER
GASKET
LOWER HINGE
BOLT
3-1 DOOR
● Refrigerator Door
1. Remove the hinge cover by pulling it upwards.
2. Loosen the hex head 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 hex head 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.
Figure 2
- 5 -
Page 6
3-2 FAN AND FAN MOTOR
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
3-4-1 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 W2EA).
Figure 9
3-4-2 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.
3-3 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)
3-4 LAMP
Figure 6
Figure 7
3-5 CONTROL BOX-REFRIGERATOR
1. First, remove all shelves in the refrigerator, than remove
the Refrigerator control Box by loosening 2 screws.
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.
3-6 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 -
Page 7
4. ADJUSTMENT
PTC STARTER
SEALED
TERMINAL
COMPRESSOR
MOTOR
C
M
S
M
2
5
6
3
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 -
Page 8
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 -
Page 9
5. CIRCUIT DIAGRAM
BETTER MODEL
- 9 -
Page 10
6. TROUBLESHOOTING
1
2
3
4
5
2
5
5
3
5
1
43
YES
NO
YES
The range of resistance is between 1~50Ω(ok)
Open or short
YES
YES
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%.
(Rated 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.
Reference Page12.
Check OLP.
Check resistance of two
terminals in OLP.
Reference Page12.
Check
starting state.
Check the power supply
under load.
(Compressor attempting
to re-start after being off
for 5 minutes).
Supply
voltage rating
with ±10%.
Did
compressor
start?
Compressor
is OK
Replace the
compressor
- 10 -
Page 11
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 -
Page 12
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 -
Page 13
6-4 SERVICE DIAGNOSIS CHART
COMPLAINTPOINTS TO BE CHECKEDREMEDY
No Cooling.
Cools poorly.
Food in the
Refrigerator
is frozen.
Condensation or ice
forms inside
the unit.
Condensation 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 -
Page 14
6-5 REFRIGERATION CYCLE
▼ 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 andthan ambient• 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.
- 14 -
Page 15
6-5-1 SEALED SYSTEM DIAGNOSIS
“Not Cooling” Complaint
All components operating, No airflow problems, Not frosted up as a defrost problem
problem has been isolated to sealed system area
Frost
Pattern?
Equalization
Test
Partial
Very Fast
Inefficient
Compressor
Partial
Restriction
Complete
Restriction
Equalization
Test
Condenser
Temperature
None
Very Fast
Very SlowVery Slow
Hotter than Normal
Air/Low Side
Leak
Loss of Change
Compressor Not
Pumping
Cap Tube
Sound
Room Temperature
Trace of Oil
Undercharge
Leak
Yes
No
Faint
Fast
None to Weak
(The equalization test is trying to restart a compressor using a start kit after it has been operating.)
- 15 -
Page 16
7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICEMAKER
• Adjusts EJECTOR to Start Position with power on.
Power On
Start Position
Ice Making
Mode
Harvest
Mode
Park Position
Fill
Test Mode
• Waits until water becomes cold after starting the
ice making operation.
• Runs MOTOR to drop ice from the tray the ICE BIN.
• Performs Ice Making Mode after supplying water by operating
the SOLENOID in ICE VALVE.
• To operate LINE and SERVICE, press and hold the Fill Key
for 3 seconds. The ice maker will run through 3 stages:
Harvest Fill Icemaking.
• With the detect lever, checks if the ICE BIN is full.
7-1 OPERATION PRINCIPLE
7-1-1 Operation Principle of IceMaker
1. Turning the Icemaker stop switch off (O) stops the ice making function.
2. Setting the Icemaker switch to OFF and then turning it back on will reset the icemaker control.
- 16 -
Page 17
7-2 CONTROL METHOD ACCORDING TO FUNCTIONS
Heater
on
off
on
0V
5V
off
30 sec.
10 sec.
Motor
Hall IC
Ice removing
completion point
2 ms
Ice making sensor temperature is 50°F(10˚C)
or more
Max. 18 minutes
After detect LEVER rises
7-2-1 Start Position
1. After POWER OFF or Power Outage, check the EJECTOR's position with MICOM initialization to restart.
2. How to check if it is in place:
- Check HIGH/LOW signals from HALL SENSOR in MICOM PIN.
3. Control Method to check if it is in place:
(1) EJECTOR is in place,
- It is an initialized control, so the mode can be changed to ice making control.
(2) EJECTOR isn't in place:
A. If EJECTOR is back in place within 2 minutes with the motor on, it is being initialized. If not, go to Step B.
B. If EJECTOR is back in place within 18 minutes with the heater on (to control Heater on its OFF condition), it is being
initialized. If not, it is not functioning. Repeat Step B with Heater and Motor off.
7-2-2 Ice Making Mode
1. Ice Making control refers to the freezing of supplied water in the ice trays. Complete ice making operations by measuring
the temperature of the Tray with Ice-Making SENSOR.
2. Ice Making starts after completing fulfilled ice control and initial control.
3. The Ice Making function is completed when the sensor reaches 19°F(-7°C), 60 to 240 minutes after starting.
4. If the temperature sensor is defective, the ice-making function will be completed in 4 hours.
NOTE : After Icemaker Power is ON, the Icemaker heater will be on for test for 9 sec.
7-2-3 Harvest Mode
1. Ice-removing control refers to the operation of dropping cubes into the ice bin from the tray when ice-making has
completed.
2. Ice removing control mode:
(1) Operates Heater for 30 seconds; then operate MOTOR.
(2) After performing Step 1 (to control the Heater on its off condition), Ice-Removal control will be back in place wthin 18
minutes. (Hall SENSOR sign = OV). Ice removal is then complete. Then change the mode to the water supply control.
If this control phase fails to start, it is not functioning. Put the Heater and Motor in the off position. Restart every 2
hours. (Refer to fig.1)
NOTE : If the motor malfunctions and starts before the detect lever rises, MICOM regards the Ice-Removing phase as
completed. Water then starts flowing. To prevent this, MICOM doesn’t switch to water-supply mode, but restarts the iceremoving mode. If this happens 3 times, the motor is malfunctioning and you should stop the loads (Heater, Motor). Then
restart the Ice-Removing mode every 2 hours. (See Step 2 above.)
<fig1. Harvest mode Process>
- 17 -
Page 18
7-2-4 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 water supply control S/W. This changes the time allowed for fill as
illustrated in the chart.
<Water supply amount TABLE>
STAGETIME TO SUPPLYINDICATIONSREMARKS
1
2
3
4
5
NOTE : Below is an example used by another vendor as an explanation of what is taking place.
6 sec.
6.5 sec.
7 sec.
7.5 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.
- 18 -
Page 19
7-2-5 Function TEST
1.
This is a compulsory operation for TEST, SVC, cleaning, etc. It is operated by pressing the water supply control KEY for 3 seconds.
2. It operates in the Ice Making mode, but not in the Ice-Removing mode or water supply process. (If there is an ERROR, it
can only be checked in the TEST mode.)
3. If the water supply control KEY is pressed for 3 seconds in the Ice-Making mode (no matter what condition the IceMaking tray is in) the Ice-Removing operation starts immediately. Water is not yet frozen, so water is poured instead of
ice. 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: ice making → Harvest → Fill → Park Position.
5. When Stage 5 is completed in the TEST mode, minimize MICOM in 5 seconds, the time needed to supply water resets to
the previous status in the TEST mode.
<Diagnosis TABLE>
STAGEITEMSINDICATORREMARKS
Five seconds after heater starts, heater will
1
2
HEATER
MOTOR
go off if temperature recorded by sensor is
10°C or lever is in up position.
Five seconds after heater starts, you can
confirm that motor is moving.
HALL IC I
3
4
5
6
(detection of
position)
VALVE
HALL IC II
(detection of full-
filled Ice)
Reset
Mark Previous Status on
TEST MODE
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 whether hall is sensing Full
ice condition. (If there is a full-filled error, the
fifth LED is not on.)
Five seconds after fifth stage is completed,
the icemaker reset at initial status.
7-3 DEFECT DIAGNOSIS FUNCTION
7-3-1 ERROR CODES shown on Ice Maker water supply control panel
NODIVISIONINDICATORCONTENTSREMARKS
1
2
Normal
Ice-Making
Sensor
malfunction
Mark time to
supply
None
Open or short-circuited wire
Display switch
operates properly
Make sure that the wire
on each sensor is
connected.
3
ERROR indicators in table can be checked only in TEST mode.
Ice Maker Kit
malfunction
When ejector blades don’t reach
park position over 18 minutes
since Harvest Mode starts.
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Check of
HALL IC/MOTOR/
HEATER/RELAY
Page 20
8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
Better Model
REFRIGERATOR TEMP
COLDER WARMER37 °F IS RECOMMENDED0 °F IS RECOMMENDED
FREEZER TEMP
COLDER WARMER
EXPRESS
FREEZING
8-1 FUNCTION
8-1-1 Function
1. When the appliance is plugged in, it is set to "37" for Refrigerator and "0" 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 "37" & "0".
Control range : 32°F ~ 46°F
0°C ~ 8°C
Control range : -6°F ~ 9°F
-21°C ~ -13°C
8-1-2 How to Change the Temperature Display from °F / °C
1. The temperature display can be toggled between °F & °C by pressing the Refrigerator COLDER key and the Freezer
COLDER Key at the same time and holding for more than one second.
2. The initial setting is °F. Whenever the mode is changed, the LED lights are changed.
8-1-3 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.
Standard RPM is used for normal usage.
3. Fan motor stops when refrigerator of freezer door opens.
8-1-4 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 this 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.
8-1-5. REFRIGERATOR LAMP AUTO OFF
1. To protect the risk of lamp heat, when Refrigerator door opens for 7 min., refrigerator lamp is auto off.
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Page 21
8-1-6 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.
8-1-7 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)
8-1-8 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)
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Page 22
8-1-9 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
Sensor is 113°F [45°C] or
more (when unit is newly
Initial power on
purchased or when moved)
POWER
ON
in 0.5 secin 0.5 sec
COMP
ON
Freezer FAN
ON
Temperature of defrosting
sensor is lower than 113°F
[45°C] (when power cuts,
SERVICE)
Reset to normal operation
from TEST MODE
POWER
in 0.5 sec
ON
in 0.5 secin 0.5 sec
COMP
Defrosting
heater ON
ON
Total load
in 7 minin 0.5 sec
COMP
OFF
ON
in 10 sec
Freezer FAN
ON
Freezer FAN
Defrost heater
OFF
ON
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Page 23
8-1-10 Defect Diagnosis Function
Defect code signs Defect code signs
Better Model
REFRIGERATOR TEMP
COLDER WARMER37 °F IS RECOMMENDED0 °F IS RECOMMENDED
FREEZER TEMP
COLDER WARMER
EXPRESS
FREEZING
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
ERROR CODE
Er
Er
FS
rS
CONTENTSREMARKS
Cut or short circuit wire
Cut or short circuit wire
Inspect Connecting wires
Failure of defrost
3
sensor
Failure of Room
4
Temperature
sensor
Failure of defrost
5
mode
Failure of BLDC
Fan Motor at
6
Freezing
Compartment
Er
dS
When display check
mode: Er rt
Er
Er
dH
FF
Cut or short circuit wire
Cut or short circuit wire
When defrost sensor
doesn’t reach 8°C within
2 hours after starting
defrost.
If there is no fan motor
signal for more than 65sec
in operation fan motor
on each sensor
Snapping of defrost heater
or Temperature fuse, pull-
out of connector (indicated
minimum 2 hours after
failure occurs)
Poor motor, hooking to
wires of fan, contact of
structures to fan, snapping
or short circuit of Lead
wires
Note 1) Room Temperature Sensor is not indicated on the failure indicating part but indicated in checking
Display. (When pressing for more than the warmer key of Refrigerator Temp. and the warmer kye of
Freezer Temp for more than 1 second).
✽ LED check function: If simultaneously pressing the warmer key of Refrigerator Temp and the warmer key of
Freezer Temp for a second, all display LED graphics on. If releasing the button, the LED graphics displays
the previous status.
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Page 24
8-1-11 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
TEST3
Reset
Push Express Freezing
Key and COLDER KEY
of Freezer Temp. at the
Same time over 3
seconds. OR Push TEST
S/W (in the main Board)
Once.
Push Express Freezing
Key and COLDER KEY
of Freezer Temp. at the
Same time over 3
seconds. In TEST MODE
1 OR Push TEST S/W
Once 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 OR Push TEST S/W
Once in TEST MODE 2
Push Express Freezing
Key and COLDER KEY
of Freezer Temp. at the
Same time over 3
seconds. In TEST MODE
3 OR Push TEST S/W
Once in TEST MODE 3
1) Continuous operation of the
COMPRESSOR and the Freezer fan
2) Stepping DAMPER OPEN
3) Defrosting HEATER OFF
4) DISPLAY LED all ON
1) Continuous operation of the
COMPRESSOR and the Freezer fan
2) Stepping DAMPER CLOSE
3) Defrosting HEATER OFF
4) DISPLAY LED ahows no. 2
1) COMPRESSOR and the Freezer fan
OFF
2) Stepping DAMPER CLOSE
3) Defrosting HEATER ON
4) DISPLAY LED ahows no. 3
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.
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Page 25
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:
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.
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Page 26
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.)
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Page 27
8-2-4 Load / Buzzer Drive & Open Door Detection Circuit
1. Load Drive Condition Check
LOAD TYPE
Measurement Location (IC6)
ON
Condition
OFF
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.
MOTOR OFF2V or less0V5V
MOTOR ON13V~15V0V2V~3V
COMP
NO.12NO.14NO.15NO.13
partpartpart
ab
DEFROSTING
HEATER
LAMP
1V or below
12V
c
FRENCH DOOR
HEATER 1, 2 /
DEW HEATER
- 27 -
Page 28
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
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(PIN NO.30 & PIN NO.27)
Page 29
8-2-5 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 Voltage
A
B
0.5 V ~ 4.5 V0 V5 V
Defrosting SensorPOINT Voltage
Room Temperature sensor
POINT Voltage
C
D
8-2-6 Refrigeration Compartment Stepping Motor Damper Circuit
* The circuit shown below is the damper circuit to regulate the refrigerator temperature.
SHORT-CIRCUITED
OPEN
- 29 -
Page 30
8-2-7 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 (LED Module) SEVEN SEGMENT DISPLAY (SEVEN SEGMENT DISPLAY
MODULE). The drive type is the scan type
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Page 31
8-3 RESISTANCE SPECIFICATION OF SENSOR
TEMPERATURE
- 20 ˚C (-4 °F)22.3 KΩ77 KΩ
- 15 ˚C (5 °F)16.9 KΩ60 KΩ
- 10 ˚C (14 °F)13.0 KΩ47.3 KΩ
- 5 ˚C (23 °F)10.1 KΩ38.4 KΩ
0 ˚C (32 °F)7.8 KΩ30 KΩ
+ 5 ˚C (41 °F)6.2 KΩ24.1 KΩ
+ 10 ˚C (50 °F)4.9 KΩ19.5 KΩ
+ 15 ˚C (59 °F)3.9 KΩ15.9 KΩ
+ 20 ˚C (68 °F)3.1 KΩ13 KΩ
+ 25 ˚C (77 °F)2.5 KΩ11 K Ω
+ 30 ˚C (86 °F)2.0 KΩ8.9 KΩ
+ 40 ˚C (104 °F)1.4 KΩ6.2 KΩ
+ 50 ˚C (122 °F)0.8 KΩ4.3 KΩ
RESISTANCE OF FREEZER
SENSOR
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.
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Page 32
COOLING is poor.NO COOLING.1. If the COMPRESSORUSE TEST MODE1 COMPRESSOR locked orReplace COMPRESSOR.