LG LRFC25750xx Service Manual

Page 1
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
TITANIUM
http://biz.lgservice.com
MODEL:LRFC25750ST
LRFC21755SB
LRFC21755ST
STAINLESS-STEEL
LRFC21755TT
Page 2
CONTENTS
SAFETY PRECAUTIONS ....................................................................................................................................................... 2
SPECIFICATIONS................................................................................................................................................................... 3
PARTS IDENTIFICATION ....................................................................................................................................................... 4
DISASSEMBLY.................................................................................................................................................................... 5-6
DOOR................................................................................................................................................................................... 5
FAN AND FAN MOTOR........................................................................................................................................................ 6
DEFROST CONTROL ASSEMBLY...................................................................................................................................... 6
LAMP.................................................................................................................................................................................... 6
CONTROL BOX-REFRIGERATOR ...................................................................................................................................... 6
MULTI DUCT ........................................................................................................................................................................ 6
ADJUSTMENT..................................................................................................................................................................... 7-8
COMPRESSOR.................................................................................................................................................................... 7
PTC-STARTER ..................................................................................................................................................................... 7
OLP (OVERLOAD PROTECTOR)........................................................................................................................................ 8
TO REMOVE THE COVER PTC...........................................................................................................................................8
CIRCUIT DIAGRAM................................................................................................................................................................ 9
TROUBLESHOOTING..................................................................................................................................................... 10-15
COMPRESSOR AND ELECTRIC COMPONENTS ........................................................................................................... 10
PTC AND OLP.................................................................................................................................................................... 11
OTHER ELECTRICAL COMPONENTS ............................................................................................................................. 12
SERVICE DIAGNOSIS CHART.......................................................................................................................................... 13
REFRIGERATION CYCLE ............................................................................................................................................ 14-15
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.
ITEMS SPECIFICATIONS
DOOR DESIGN Side Rounded
DIMENSIONS (inches)
NET WEIGHT (pounds)
COOLING SYSTEM Fan Cooling
TEMPERATURE CONTROL Micom Control
DEFROSTING SYSTEM
DOOR FINISH Embossed Metal, VCM, Stainless
HANDLE TYPE Bar
INNER CASE ABS Resin
INSULATION Polyurethane 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
ITEMS SPECIFICATIONS
VEGETABLE TRAY Opaque Drawer Type
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Wire Condenser
REFRIGERANT R-134a (115 g)
LUBRICATING OIL Freol @ 10G (310 cc)
DEFROSTING DEVICE SHEATH HEATER
REFRIGERATOR 60 W (2EA)
LAMP
FREEZER 40 W (1EA)
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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
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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
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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
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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 dont 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.
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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.
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Page 9
5. CIRCUIT DIAGRAM
BETTER MODEL
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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 1~50(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
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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 0(short) or (open).
Check another electric component.
Replace OLP.
Replace PTC­Starter.
Figure 14
Figure 15
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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.
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Page 13
6-4 SERVICE DIAGNOSIS CHART
COMPLAINT POINTS TO BE CHECKED REMEDY
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.
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Page 14
6-5 REFRIGERATION CYCLE
Troubleshooting Chart
CAUSE
PARTIAL Freezer Low flowing sound of A little higher Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard and than ambient to a leak.
LEAKAGE
COMPLETE Freezer Flowing sound of refrigerant Equal to ambient No discharging of Refrigerant. LEAKAGE compartment and is not heard and frost isn't temperature. Normal cooling is possible by
CLOGGED BY DUST
PARTIAL Freezer Flowing sound of refrigerant A little higher Normal discharging of the CLOG compartment and is heard and frost forms than ambient refrigerant.
WHOLE CLOG
MOISTURE Cooling operation Flowing sound of refrigerant Lower than Cooling operation restarts CLOG stops periodically. is not heard and frost melts. ambient when heating the inlet of the
COMPRESSION
COMP- Freezer and Low flowing sound of A little higher Low pressure at high side
DEFECTIVE
RESSION Refrigerator refrigerant is heard and than 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 refrigerant Equal to ambient Normal discharging of the is not heard and frost isn't temperature. Refrigerant. formed.
TEMPERATURE
OF THE
REMARKS
COMPRESSOR
refrigerant and repairing the leak.
temperature. capillary tube.
NO COMP- No compressing Flowing sound of refrigerant Equal to ambient No pressure in the high RESSION operation. is not heard and there is temperature. pressure part of the
no frost. compressor.
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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.)
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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.
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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 doesnt 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>
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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>
STAGE TIME TO SUPPLY INDICATIONS REMARKS
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.
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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 doesnt 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>
STAGE ITEMS INDICATOR REMARKS
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
NO DIVISION INDICATOR CONTENTS REMARKS
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 dont reach
park position over 18 minutes
since Harvest Mode starts.
- 19 -
Check of
HALL IC/MOTOR/
HEATER/RELAY
Page 20
8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
Better Model
REFRIGERATOR TEMP
COLDER WARMER 37 °F IS RECOMMENDED 0 °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
Closed Open Closed Open
3 Times 3 Times 3 Times 3 Times
Closed
Within 1 min. 1 min.
30 sec 30 sec 30 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 doesnt 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 wont 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.
OPERATING ORDERS
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 sec in 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 sec in 0.5 sec
COMP
Defrosting
heater ON
ON
Total load
in 7 min in 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 WARMER 37 °F IS RECOMMENDED 0 °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
NO ITEM
Failure of freezer
1
sensor
Failure of
2
Refrigerator sensor
ERROR CODE

Er
Er
FS
rS
CONTENTS REMARKS
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
doesnt 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.
MODE MANIPULATION CONTENTS REMARKS
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 temperatures 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:
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.
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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 OFF 2V or less 0V 5V
MOTOR ON 13V~15V 0V 2V~3V
COMP
NO.12 NO.14 NO.15 NO.13
part part part
a b
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 s 0.5 s
2.63 kz (Beep~)
OFF
0.05 s
0.1 s0.2 s 2 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
Closed 5 V
Open 0 V
- 28 -
(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:
SENSOR CHECK POINT NORMAL (-30°C ~ 50°C)
Freezer Sensor POINT Voltage
Refrigerator Sensor POINT Voltage
A
B
0.5 V ~ 4.5 V 0 V 5 V
Defrosting Sensor POINT 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
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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 K 77 K
- 15 ˚C (5 °F) 16.9 K 60 K
- 10 ˚C (14 °F) 13.0 K 47.3 K
- 5 ˚C (23 °F) 10.1 K 38.4 K
0 ˚C (32 °F) 7.8 K 30 K
+ 5 ˚C (41 °F) 6.2 K 24.1 K
+ 10 ˚C (50 °F) 4.9 K 19.5 K
+ 15 ˚C (59 °F) 3.9 K 15.9 K
+ 20 ˚C (68 °F) 3.1 K 13 K
+ 25 ˚C (77 °F) 2.5 K 11 K
+ 30 ˚C (86 °F) 2.0 K 8.9 K
+ 40 ˚C (104 °F) 1.4 K 6.2 KΩ
+ 50 ˚C (122 °F) 0.8 K 4.3 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 COMPRESSOR USE TEST MODE1 COMPRESSOR locked or Replace COMPRESSOR.
is poor.
POWER SOURCE 1.
8-4 TROUBLESHOOTING
PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION
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. sticking on the EVAPORATOR . is poor.
is normal. of the Refrigerator poor.
SENSOR.
TEMPERATURE is operates. (forced COOLING).
incorrect CONNECTING WIRE is poor. Refer to 8-2-4. 2 and check
2. If DEFROSTING Check the amount of frost DEFROSTING is poor. See DEFROSTING
FREEZER 1. If FAN MOTOR USE TEST MODE1 FAN MOTOR is poor. Replace the FAN MOTOR.
2. If refrigerant is leaking. Measure the amount of frost Refrigerant leakage. Replace the leaking part and
. sticking on EVAPORATOR replace any lost refrigerant.
and the surface temperature
of the condenser pipe.
DISPLAY operates the MAIN PWB CONNECTOR. is poor.
abnormally CONNECTOR. TRANS FUSE is open. Replace TRANS.
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.
dont press the KEY and poor.
wait. THE CONNECTING WIRE Check the connection of the
2. DISPLAY is 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
CONNECTOR (CON1).
blocked.
- 32 -
Page 33
DEFROSTING is NO DEFROSTING. 1. If HEATER emits heat. USE TEST MODE2 HEATER disconnection. Replace HEATER.
poor. (forced DEFROSTING).
COOLING is poor. If REFRIGERATOR 1. If FREEZER TEMPERATURE Check is FREEZER Make sure the
TEMPERATURE is normal. TEMPERATURE is too low. DOOR isattached.
is too low. 2. If amount of cool air from Make sure that the amount FAN MOTOR is poor. Replace FAN MOTOR.
PROBLEM INDICATED BY CHECK CHECKING METHOD CAUSE SOLUTION
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.
blocked. Check HEATER PLATE
2. If DRAIN PIPE is Check DRAIN PIPE. DRAIN PIPE is blocked. Remove ice and impurities.
TEMPERATURE FUSE Replace TEMPERATURE
disconnection. FUSE.
DEFROST-SENSOR is poor. Replace DEFROST-SENSOR.
HEATER RELAY is poor. Replace RY2 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.
resistance.
connection and wire of MAIN
PWB CONNECTOR.
- 33 -
Page 34
8-5 MAIN PWB ASSEMBLY AND PARTS LIST
8-5-1 Main PWB Assembly
- 34 -
Page 35
8-5-2 Replacement Parts List
- 35 -
Page 36
8-5-3 PWB Assembly, Display, And Parts List
SW106
- 36 -
Page 37
8-6 PWB DIAGRAM
8-6-1 PWB Main Assembly
- 37 -
Page 38
- 38 -
Page 39
9. EXPLODED VIEW & REPLACEMENT PARTS LIST
106A
315A
400A
313A
501A
411A
501F
303C
318A
303B
314A
300A
312A
317A
304A
103A
105A
301A
283B
283B
328A
418A
207B
103B
207A
271C
271B
271A
271B
315B
315B
315C
315C
323B
329C
420A
319A
319C
503D
262B
410A
409D
409B
158A
405F
404A
405C
332A
135D
405A
158B
145B
409A
503C
503E
106A
120B
145A
406D
249D
249C
610A
610A
406A
282F
405B
329A
262H
103C
135C
402A
402A
410G
406B
CASE PARTS
CAUTION: Use the part number to order part, not the position number.
- 39 -
Page 40
FREEZER PARTS
145C
136A
136B
237C
248F
145F
177B
131A
CAUTION: Use the part number to order part, not the position number.
- 40 -
Page 41
REFRIGERATOR PARTS
141B
141C
141A
141B
141C
141A
146A
161E
*
141B
141C
141A
141B
141C
141A
147C
147B
147A
167B
154A
161A
*
145E
161C
*
160B
161A
*
161D
*
151A
248H
162B
145D
160B
162A
160C
155J
146B
151C
161F
*
210A
CAUTION: Use the part number to order part, not the position number.
: on some models
*
- 41 -
Page 42
DOOR PARTS
233A233D
231A
233B 233C
231B
241C
237A
241C
241C
230B
241A
241B
241C
237A
241C
243A
243A
205C
203A
201A
205B
205A
249B
249A
281D
212D
281D
244E
244E
212G
230A
CAUTION: Use the part number to order part, not the position number.
: on some models
*
- 42 -
Page 43
ICE & MAKER PARTS
602A
600A
616E
619A
623B
623A
CAUTION: Use the part number to order part, not the position number.
- 43 -
Page 44
P/No. 3828JL8031C APR., 2004 Printed in Korea
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