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EXPLANATION FOR MICOM CIRCUIT

1. Circuit Descriptions

1-1. Power circuit
LRSC269**** The power circuit includes a Switched Mode Power Supply (SMPS). It consists of a rectifier (BD1 and CE1) converting AC to DC, a switch (IC2) switching the DC voltage, a transformer, and a feedback circuit (IC3 and IC4). Caution : Since high voltage (160 Vdc) is maintained at the power terminal, wait at least 3 minutes after unplugging the appliance to allow the current to dissipate. Voltage of every part is as follows:

Part Voltage

CE4 15.5 Vdc

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1-2. Oscillation circuit
The oscillation circuit generates a basic clock signal for synchronization and time calculation related to the transmission of data and calculations made by the MICOM (IC1). The oscillator (OSC1) must always be replaced with an exact rated part, because if this spec is changes, the time calculations of the MICOM will be affected and it might not work at all. LRSC269****

1-3. Reset circuit

The RESET circuit allows various parts of the MICOM, such as RAM, defrosting, etc., to be restarted from the initial state when power is interrupted or restored. A LOW signal applied to the reset terminal for 10 ms causes the MICOM to reset itself. During normal operation, the voltage at the reset terminal is 5 Vdc. If the reset fails, the MICOM will not operate.

LRSC269****

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1-4. Load driving circuit
The fan operates at the regular speed even if the door of the refrigerator or freezer is opened. When the doors are closed, the fan reverts to its original speed. (A), (B), (C), and (D) of door switch for the freezer or refrigerator are connected to the door open sensing circuit in parallel toward both ends of the switch. In the TEST mode, the fan will stop if any door is opened. It will resume operation when the door is closed. LRSC269****

Type of Load

Compressor
Frost Removal Heater IC6-10
AC Converting Relay IC7-16

Refrigerator LAMP IC6-13

Dispensor Heater IC6-11

Magic room Heater IC6-12

Measuring part (IC6) Status ON OFF

IC6-14

Within 1 V 12 V

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1-5. Dispenser operation circuit
Check load driving status WATER VALVE WATER IC7-13 Within 1 V 12 V

GEARED MOTOR IC7-15

SOLENOID CUBE IC7-14
SOLENOID DISPENSER IC7-12
Measuring part Status ON OFF
Lever Switch sensing circuit Measuring part Lever S/W On(Press) OFF 5V 0V 5V IC1(Micom) (No. 16) (60 Hz)

- 35 -

1-6. Door sensing circuit
Measuring part IC1 (MICOM) No. 47, 46 Pin Door of Freezer / Refrigerator Closing Opening 5 V ( A - B , C - D. Switch at both ends are at Off status) 5 V ( A - B , C - D. Switch at both ends are at On status)

CCW (Reverse rotation)

(Positive rotation) CW

INA INB A B A

- 39 -
1-11. Fan motor driving circuit (freezer, mechanical area)
1. The circuit cuts all power to the fan drive IC, resulting in a standby mode. 2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc. 3. This circuit stops the fan motor by cutting off power to the fan when it senses a lock-up condition. LRSC269**** a , d part Motor OFF Motor ON 5V 2 ~ 3V b part 2V or less 12 ~ 14V e part 2V or less 8 ~ 16V c , f part 0V 0V

COMPRESSOR -FAN PWM

COMPRESSOR -FAN LOCK

FREEZER-FAN PWM

FREEZER-FAN LOCK

- 40 -

1-12. Temperature compensation circuit
Temperature compensation at refrigerator Temperature compensation at freezer
Freezer Resistance value (RCF1) 180 k 56 k 33 k 18 k 12 k 10 k 8.2 k 5.6 k 3.3 k 2 k 470 Temperature compensation +5 C [+9F] +4 C [+7.2F] +3 C [+5.4F] +2 C [+3.6F] +1 C [+1.8F] 0 C [0F] -1 C [-1.8F] -2 C [-3.6F] -3 C [-5.4F] -4 C [-7.2F] -5 C [-9F]
Refrigerator Resistance value (RCR1) 180 k 56 k 33 k 18 k 12 k 10 k 8.2 k 5.6 k 3.3 k 2 k 470 Temperature compensation +2.5 C [+4.5F] +2.0 C [+3.6F] +1.5 C [+2.7F] +1.0 C [+1.8F] +0.5 C [+0.9F] 0 C [0F] -0.5 C [-0.9F] -1.0 C [-1.8F] -1.5 C [-2.7F] -2.0 C [-3.6F] -2.5 C [-4.5F] Cooler Reference temperature Remarks Warmer
u Temperature compensation table by adjustment value (difference value against current temperature) Ex) If you change compensation resistance of (RCR1) from 10 k (current resistance) to 18 k (modified resistance), the temperature will increase by +1C[+1.8F].

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u Temperature compensation table for the refrigerator is as follows: Modification resistance 470 Current resistance No 470

180 k 5 C [9 F] Up

0.5 C 1 C 1.5 C 2 C 2.5 C 3 C 3.5 C 4 C 4.5 C [0.9 F] [1.8 F] [2.7 F] [3.6 F] [4.5 F] [5.4 F] [6.3 F] [7.2 F] [8.1 F] change Up Up Up Up Up Up Up Up Up
0.5 C No 0.5 C 1 C 1.5 C 2 C 2.5 C 3 C 3.5 C 4 C 4.5 C [0.9 F] [0.9 F] [1.8 F] [2.7 F] [3.6 F] [4.5 F] [5.4 F] [6.3 F] [7.2 F] [8.1 F] Down change Up Up Up Up Up Up Up Up Up 0.5 C 1 C 1.5 C 2 C 2.5 C 3 C 3.5 C 4 C [0.9 F] [1.8 F] [2.7 F] [3.6 F] [4.5 F] [5.4 F] [6.3 F] [7.2 F] Up Up Up Up Up Up Up Up No change 0.5 C 1 C 1.5 C 2 C 2.5 C 3 C 3.5 C [0.9 F] [1.8 F] [2.7 F] [3.6 F] [4.5 F] [5.4 F] [6.3 F] Up Up Up Up Up Up Up 0.5 C 1 C 1.5 C 2 C 2.5 C 3 C [0.9 F] [1.8 F] [2.7 F] [3.6 F] [4.5 F] [5.4 F] change Up Up Up Up Up Up No

1 C 0.5 C No 3.3 k [1.8 F] [0.9 F] Down Down change 1.5 C 1 C 0.5 C 5.6 k [2.7 F] [1.8 F] [0.9 F] Down Down Down

Refrigerator (RCR1)

2 C 1.5 C 1 C 0.5 8.2 k [3.6 F] [2.7 F] [1.8 F] [0.9 F] Down Down Down Drop 10 k
2.5 C 2 C 1.5 C 1 C 0.5 C No 0.5 C 1 C 1.5 C 2 C 2.5 C [4.5 F] [3.6 F] [2.7 F] [1.8 F] [0.9 F] [0.9 F] [1.8 F] [2.7 F] [3.6 F] [4.5 F] Down Down Down Down Down change Up Up Up Up Up 3 C 2.5 C 2 C 1.5 C 1 C 0.5 C [5.4 F] [4.5 F] [3.6 F] [2.7 F] [1.8 F] [0.9 F] Down Down Down Down Down Down 0.5 C 1 C 1.5 C 2 C [0.9 F] [1.8 F] [2.7 F] [3.6 F] change Up Up Up Up No
3.5 C 3 C 2.5 C 2 C 1.5 C 1 C 0.5 C No 0.5 C 1 C 1.5 C [6.3 F] [5.4 F] [4.5 F] [3.6 F] [2.7 F] [1.8 F] [0.9 F] [0.9 F] [1.8 F] [2.7 F] Down Down Down Down Down Down Down change Up Up Up 4 C 3.5 C 3 C 2.5 C 2 C 1.5 C 1 C 0.5 C [7.2 F] [6.3 F] [5.4 F] [4.5 F] [3.6 F] [2.7 F] [1.8 F] [0.9 F] Down Down Down Down Down Down Down Down 0.5 C 1 C [0.9 F] [1.8 F] change Up Up 0.5 C [0.9 F] change Up No change No No
4.5 C 4 C 3.5 C 3 C 2.5 C 2 C 1.5 C 1 C 0.5 C [8.1 F] [7.2 F] [6.3 F] [5.4 F] [4.5 F] [3.6 F] [2.7 F] [1.8 F] [0.9 F] Down Down Down Down Down Down Down Down Down 5 C [9 F] Down
4.5 C 4 C 3.5 C 3 C 2.5 C 2 C 1.5 C 1 C 0.5 C [8.1 F] [7.2 F] [6.3 F] [5.4 F] [4.5 F] [3.6 F] [2.7 F] [1.8 F] [0.9 F] Down Down Down Down Down Down Down Down Down
u Temperature compensation for the freezer is performed the same as for the refrigerator. The value for the freezer is twice that of the refrigerator. u This circuit enters the necessary level of temperature compensation for adjusting the appliance. The method is the same for every model in this appliance family.

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Compensation circuit for temperature of freezer LRSC269****

R18 R19 R20

R21 R22 R23
Temperature compensation in CUT JCR1 JCR2 JCR3 JCR4 +1 C [+1.8 F] +1 C [+1.8 F] -1 C [-1.8 F] -1 C [-1.8 F] +2 C [+3.6 F] -2 C [-3.6 F]
Compensation for weak-cold JCR3 JCR4
Compensation for over-cold JCR1 JCR2
Temperature compensation value of refrigerator 0 C (In shipment from factory)

Remarks

CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT CUT

-1 C [-1.8 F] -1 C [-1.8 F] +1 C [+1.8 F] +1 C [+1.8 F] -2 C [-3.6 F] +2 C [+3.6 F] 0 C [0 F] 0 C [0 F] 0 C [0 F] 0 C [0 F] -1 C [-1.8 F] +1 C [+1.8 F] 0 C [0 F]
u This circuit allows adjustment of the set temperature for compensation by changing jumpers at locations JCR1~JCR4.

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1-13. Communication circuit
The following communication circuit is used for exchanging information between the main MICOM of the Main PCB and the dedicated MICOM of the LED (LCD) Display PCB. A bi-directional lead wire assembly between the two boards is required for the display to function properly. Poor communication occurs if a continuous information exchange fails to last more than 2 minutes between main MICOM of main PCB and LCD (LED) dedicated MICOM for LCD (LED) control of display PCB.

Main PCB

L/Wire FD/H(4-wires)

DC 12V

Display PCB

Main MICOM

LCD(LED) dedicated MICOM
Transmission (error status)

Reception (notch status)

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PWB ASSEMBLY DISPLAY

Sensor resistance characteristics table Measuring Temperature (C) -20 C (-4 F) -15 C (5 F) -10 C (14 F) -5 C (23 F) 0 C (32 F) +5 C (41 F) +10 C (50 F) +15 C (59 F) +20 C (68 F) +25 C (77 F) +30 C (86 F) +40 C (104 F) +50 C (122 F) Freezing Sensor 22.3 k 16.9 k 13.0 k 10.1 k 7.8 k 6.2 k 4.9 k 3.9 k 3.1 k 2.5 k 2.0 k 1.4 k 0.8 k Cold storage sensor 1&2 Frost removal sensor, Outside sensor 77 k 60 k 47.3 k 38.4 k 30 k 24.1 k 19.5 k 15.9 k 13 k 11 k 8.9 k 6.2 k 4.3 k
u Resistance value allowance of sensor is 5%. u When measuring the resistance value of the sensor, allow the temperature of that sensor to stabilize for at least 3 minutes before measuring. This delay is necessary because of the sense speed relationship. u Use a digital tester to measure the resistance. An analog tester has too great a margin of error. u Resistance of the cold storage sensor 1 and 2 should be measured with a digital tester after separating CON8 of the PWB ASSEMBLY and the MAIN part. u Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSEMBLY and the MAIN part.

3. Defect diagnosis function
3-1. ERROR CODES shown on Ice Maker water supply control panel NO

DIVISION

Normal Icemaking Sensor malfunction

Mark time to supply

Display switch operates properly Make sure that the wire on each sensor is connected. Defects of HALL IC/MOTOR/ HEATER/RELAY/ STALLED EJECTOR.
Cut or short-circuited wire

Icemaker Kit malfunction

When ejector blades doesnt reach park position in 18 minutes after Dump Mode starts.
ERROR indicators in table can be checked only in TEST mode.

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CIRCUIT

LRSC26944**, LRSC26980TT

- 60 -

LRSC26930**

FREEZER COMPRESSOR

FREEZER-LAMP

FREEZER-DOOR SWITCH

ICEMAKER KIT

REF-UPPER REF-LOWER REF

REF-DOOR SWITCH

- 61 -

LRSC26920**, LRSC26922**

FREEZER FREEZER-LAMP

DISPENSER LEVER SWITCH

- 62 -

TROUBLE DIAGNOSIS

Troubleshooting
PROBLEM 1. Faulty start 1) No power at outlet. 2) No power on cord. Bad connection between adapter and outlet. (faulty adapter) The Inner diameter of adapter. The distance between holes. The distance between terminals. The thickness of terminal. Bad connection between plug and adapter (faulty plug). The distance between pins. Pin outer diameter. 3) Shorted start circuit. No power on Disconnected copper wire. power cord. Internal electrical short. Faulty terminal contact. Loose contact. - Large distance between male terminal. - Thin female terminal. Terminal disconnected. Bad sleeve assembly. Disconnected. Weak connection. Short inserted cord length. Worn out tool blade. Power cord is disconnected. Faulty soldering. CAUSE/CHECK POINTS REMARKS * Measuring instrument: Multi tester I Check the voltage. If the voltage is within 85% of the rated voltage, it is OK. I Check the terminal movement.
I Check both terminals of power cord. Power conducts:OK. No power conducts:NG

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PROBLEM 6. Condensation and ice formation. CAUSE/CHECK POINTS 4) Condensation on door. Condensation on the duct door. - Duct door heater is cut. Condensation on the Recess Heater is cut. dispense recess. Duct door is open. / Foreign material clogging. Condensation on the door surface. Not fully filled. Surface. Corner. Adiabatics liquid contraction. Liquid shortage. Liquid leak. REMARKS
Condensation on the gasket surface.

Bad wing adhesion.

Wing sag(lower part). Door liner shape mismatch. Corner. Too much notch. Broken. Home Bar heater is cut.
5) Water on the floor. Condensation in the refrigerator compartment. Defrosted water overflows. Clogged discharging hose. Discharging hose Evaporation tray located at wrong place. location. Tray drip. Damaged. Breaks, holes. Small Capacity. Position of drain.

7. Sounds

1) Compressor compartment operating sounds. Compressor sound Sound from machine itself. inserted. Sound from vibration. Restrainer. Bushing Too hard. seat. Distorted. Aged. Burnt. Stopper. Bad Stopper Not fit assembly. (inner diameter of stopper). Tilted. Not Compressor base not connected. Bad welding compressor stand(fallen). Foreign materials in the compressor compartment. OLP sound. Capacitor noise. Pipe sound. Chattering sound. Insulation paper vibration. Pipe contacts each other. Narrow interval. No vibration damper. Damping Bushing-Q. Damping Bushing-S. Capillary tube unattached.

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PROBLEM 7. Sounds CAUSE/CHECK POINTS 1) Compressor compartment operating sounds. Transformer sound. Its own fault. Core gap. Bad connection. Correct screw connection. Drip tray vibration sound. Bad assembly. Distortion. Foreign materials inside. Back cover machine sound. Condenser drain sound. Bad connection. Partly damaged. Not connected. Bad pipe caulking. REMARKS
2) Freezer compartment sounds. Fan motor sound. Normal operating sound. Vibration sound. Aged rubber seat. Bad torque for assembling motor bracket. Sounds from fan contact. Fan guide contact. Shroud burr contact. Damping evaporator contact. Residual frost contact. Damaged heater cord. Narrow evaporator interval. Unbalanced Surface machining conditions. Fan distortion. Misshappen. Burr.

Unbalanced fan sounds.

Ice on the fan. Air intake (opposite to motor bushing assembly.)
Motor shaft contact sounds. Resonance. Evaporator noise.
Supporter distorted. Tilted during motor assembly.
Evaporator pipe contact. No damping evaporator. Sound from refrigerant. Stainless steel pipe shape in accumulator. Sound from fin evaporator and pipe during expansion and contraction.
3) Bowls and bottles make contact on top shelf. 4) Refrigerator roof contact. 5) Refrigerator side contact. 6) Insufficient lubricants on door hinge.

- 70 -

PROBLEM 8. Faulty lamp (freezer and refrigerator compartment). 1) Lamp problem. 2) Bad lamp assembly. 3) Bad lamp socket. Disconnection. Short. CAUSE/CHECK POINTS Filament blows out. Glass is broken. Not inserted. Loosened by vibration. Bad soldering. Bad rivet contact. Water penetration. REMARKS

Hiss sound

1. Loud sound of compressor

operation.

2. Pipes resonate sound which is
connected to the compressor.
2.3 Touch pipes with hands or screw 6) Adjust fan to be in the center of

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3. Fan operation sound in the freezer 3.1 Check fan insertion depth and
4. Fan operation sound in the
Problems 1-1. Remove and replace the shelves in the refrigerator 1-2. Check light food and container on the shelves. 2-1. Touch pipes in the compressor compartment with hands. 2-2. Check capillary tube touches cover back. 3-1. Check compressor stopper vibration. 4-1. Check vibration of front and rear moving wheels. 5-1. Touch other structures and parts. vibtates severely. 4) Replace compressor stopper if it (especially compressor and pipe). and restrainer if it is severe. 3) Reduce vibration with bushing interfere with each other. 2) Leave a clearance where parts vibration is severe. and insert foam or cushion where 1) Reassemble the vibrating parts
Vibration sound. 1. Vibration of shelves and foods in

Clack.

the refrigerator.
2. Pipes interference and capillary
tube touching in the compressor.
3. Compressor stopper vibration.
4. Moving wheel vibration.
5. Other structure and parts

vibration.

- 82 1-1 Check time and place of sound sources.
Irregular sound. 1. It is caused by heat expansion
1) Explain the principles of refrigeration and that the temperature difference between operation and defrosting can make sounds. 2) If evaporator pipe contacts with other structures, leave a clearance between them (freezer shroud or inner case).

Click.

and contraction of evaporator,
shelves, and pipes in the

refrigerator.

Problems - Check the restrainer attached on the evaporator and capillary tube weld joints and attach another restrainer. - If it is continuous and servere, insert capillary tube again (depth 153mm) - Fasten the capillary tube to suction pipes or detach in the compressor compartment. - Explain the principles of freezing cycles.
Sound Popping It happens when refrigerant expands - Check the sound of refrigerant at the initial installation. - Check the sound when the refrigerator starts operation after forced defrosting. - Check the restrainer attachment conditions on the evaporator and capillary tube weld joints.
(almost the same at the end of capillary tube.

as animals crying

sound).
Water boiling or turned on. - Check the sound when compressor is turned off.
It happens when refrigerant passes
- Check the sound when compressor is
- Explain the principles of freezing cycles and refrigerant flowing phenomenon by internal pressure difference. - If sound is servere, wrap the accumulator with foam and restrainer.

flowing sound.

orifice in accumulator internal pipes by
- 83 - Check the sound by opening and closing the refrigerator or freezer doors.
the pressure difference between
condenser and evaporator.

Sound of whistle

When door closes, the internal pressure
- Broaden the cap of discharge hose for defrosting in the compressor compartment. - Seal the gap with sealant between out and inner cases of hinge in door.

when door

of the refrigerator decreases sharply

closes.

below atomosphere and sucks air into
the refrigerator, making the whistle

sound.

18. Odor
Causes - Check the food is not wrapped. - Check the shelves or inner wall are stained with food juice. - Be sure food is securely covered with plastic wrap. - Chedk food cleanliness. button at strong. - Clean the refrigerator and set container instead of vinyl wraps. - Store the food in the closed with adequate ventilation. - Dry the deodorizer in a sunny place Checks Measures Remarks

Food Odor.

Food (garlic, kimchi, etc)
Plastic Odor. plastic bowl and bag. - It happens in the new refrigerator. or odorous foods.
Odors of mixed food and plastic
- Check wet food is wrapped with
- Clean the refrigerator. - Persuade customers not to use plastic bag or wraps with wet food

odors.

- 84 - Check the deodorizer odors.

Odor from the

Odor from the old deodorizer.
- Dry the deodorizer with dryer and then in the shiny and windy place. - Remove and replace the deodorants.

*Deodorizer : option

deodorizer.

19. Micom

Causes Bad connection between Main PCB and display circuit. Defective PCB transformer. PCB transformer temperature fuse is burnt out. DefectivePCB electric circuit parts. PCB electric terminal fuse is burnt out. STR Parts are damaged. terminal with a tester. Check if STR No. 2 and 3 pins are cut when power is off. Replace parts. Applicable to model with dispenser. Bad connection between Main PCB and display circuit. bad. Defective LCD. Defective LCD. Check if all LCD are on when Main PCB Test switch is pressed (or when both freezer key and power freezer key are pressed at the same time for more than one second.) terminal connection is main PCB and display PCB is cut or connector Lead Wire connecting Check Lead Wire terminals connecting Main PCB and display PCB with a tester. Reconnect Lead Wire and directly connect defective contact terminal to Lead Wire. Replace display PCB. Refer to display circuit in circuit explanation. Check fuse in PCB electric (7812, 7805). terminals. Replace PCB fuse. Defective regulator IC Check voltage at input/output winding is cut). Replace regulator. Refer to electric circuit in circuit explanation. (If resistance is infinity, trans terminals with a tester. winding is cut. transformer input and output transformer or PCB. PCB transformer Check resistance of PCB Replace PCB PCB to display PCB. Applicable to model without dispenser. connection from main connection. connector. Bad connector Visual check on connector Reconnect Checks Measures Remarks

Bad cooling

Refrigerator

temperature.

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refrigerator sensor with a tester. sensor.
Problems Defrost lead wire is cut. tester. Defective defrost driving relay. with a tester after pressing main PCB test switch twice. If the voltage is normal then it is OK. Defective defrost sensor parts. with a tester. sensor. Check the resistance of defrost sensor Replace defrost and RY 3) or PCB. Check the voltage of CON2 (1 and 7) Replace relay (RY 7 Wire. Refer to load driving conditions check in circuit explanation. Refer to sensor resistance characteristic table of circuit explanation. Defective connecting lead wire from main PCB to door switch. Defective door switch parts. guide. switch with a tester. Refer to door switch in parts repair Replace door switch. Check lead wire related to door Repair lead wire. Check if defrost lead wire is cut with a Reconnect Lead

Bad defrost.

Defrost is not

working.

Defective

Buzzer

buzzer

continuously

- 88 Key input wire is cut or bad connector terminal contact in main PCB and display PCB connecting lead wire. Key is continuously depressed due to structural interference. visually.

rings or door

opening alarm
does not work. Check input wire with a tester. Reconnect lead wire and replace or directly connect bad contact terminal to lead wire. Refer to display circuit in circuit explanation.

Buzzer does

display button

not sound

and buttons

do not

Disassemble frame display and confirm
Adjust or replace interfering structures.
Problems Trouble mode indication. indication in function explanations. Check trouble diagnosis function. Repair troubles Refer to mode

display button.

do not operate.
Door Buzzer main PCB to door switch. Defective freezer compartment door switch parts. guide. switch. Defective connecting lead wire from Main PCB to lever switch. Defective lever switch parts Defective photo coupler IC parts. switch with a tester. Check Lead Wire associated with lever Refer to door switch in parts repair switch.
Defective connecting lead wire from
Check lead wire associated with door
Repair lead wire. Replace Freezer compartment door
Check model with dispenser.

does not work.

Bad water/ice

Ice and water

Repair lead wire.

dispenser.

Drier High pressure side

Refrigent Intake
When replacing a drier: Weld and parts by blowing nitrogen (0.1~0.2kg/cm2) to high pressure side after assembling a drier. When replacing a compressor: Weld and parts by blowing nitrogen to the low pressure side. Note) For other parts, nitrogen blowing is not necessary because it does not produce oxidized scales inside pipe because of its short welding time. 3. Replacement of drier. * Unit : mm
12 Filter Inserting a capillary tube
KEY POINT Be sure to check the inserted length of capillary tube when it is inserted. (If inserted too far, the capillary tube will be blocked by the filter.)
Measure distance with a ruler and put a mark(12+3/-0)on the capillary tube. Insert tube to the mark and weld it

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Items 4. Vacuum degassing.
Suction pipe Hot Line Compressor Drier

Precautions

Evaporator
Low pressure Blue Yellow Red

High pressure

Vacuum Pump

Pipe Connection

KEY POINT - If power is applied during vacuum degassing, vacuum degassing shall be more effective.
- Run the compressor Connect the red hose to the high pressure side and the blue hose to the while charging the low pressure side. Vacuum Sequence Open valves and and evacuate for 40 minutes. Close valve. 5. Refrigerant charging. Charging sequence 1) Check the amount of refrigerant supplied to each model after completing vacuum degassing. 2) Evacuate charging canister with a vacuum pump. 3) Measure the amount of refrigerant charged. - Measure the weight of an evacuated charging canister with an electronic scale. - Charge refrigerant into a charging canister and measure the weight. Calculate the weight of refrigerant charged into the charging canister by subtracting the weight of an evacuated charging canister.
Indicate the weight of an evacuated charging canister R134a
system. It is easier and works better.
KEY POINT - Be sure to charge the refrigerant at around 25C [77F]. - Be sure to keep -5g in the winer and +5g in summer.
Calculation of amount of refrigerant charged the amount of refrigerant charged= weight after charging weight before charging (weight of an evacuated cylinder)

- 94 -

Items Precautions Evaporator Hot Line Compressor Drier Condenser Charging Canister 4) Refrigerant Charging Charge refrigerant while operating a compressor as shown above. 5) Pinch the charging pipe with a pinch-off plier after completion of charging. 6) Braze the end of a pinched charging pipe with copper brazer and take a gas leakage test on the welded parts. 6. Gas-leakage test 7. Pipe arrangement in each cycle * Test for leaks on the welded or suspicious area with an electronic leakage tester. When replacing components, be sure each pipe is replaced in its original position before closing the cover of the mechanical area.

Bushing

5. Standard Regulations For Heavy Repair
1) Observe the safety precautions for gas handling. 2) Use JIG (or a wet towel) in order to prevent electric wires from burning during welding. (In order to prevent insulation break and accident.) 3) The inner case will melt and the insulation will burn. 4) The copper piping will oxidize. 5) Do not allow aluminum and copper pipes to touch. (In order to prevent corrosion.) +3 6) Observe that the inserted length of a capillary tube into a drier should be 12 -0 mm.
Drier Molecular Sieves Molecular Pipe

12 - mm

7) Make sure that the inner diameter is not distorted while cutting a capillary tube. 8) Be sure that the suction pipe and the filling tube should not be substituted each other during welding. (High efficiency pump.)

- 95 -

6. Brazing Reference Drawings
PIPE ASSEMBLY, HOT LINE (Freezer)
Copper Brazer Copper Brazer

CAPI - TUBE

DRIER ASSEMBLY Copper Brazer Silver Brazer
PIPE ASSEMBLY, SUCTION Copper Brazer

PIPE ASSEMBLY, JOINT

PIPE ASSEMBLY, Copper Brazer JOINT Copper Brazer Coppper Brazer
CONDENSER ASSEMBLY, WIRE Silver Brazer

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HOW TO DEAL WITH CLAIMS

1. Sound

Problems Hiss sounds Checks and Measures I Explain general principles of sounds. All refrigerators make noises when they run. The compressor and fan produce sounds. There is a fan in the freezer compartment which blows cool air to freezer and refrigerator compartments. Hiss sounds are heard when the air passes through the narrow holes into the freezer and refrigerator compartments. I Cooling Fan sound in the compressor compartment. There is a fan on the back of the refrigerator which cools the compressor compartment. If there is a small space between the refrigerator and the wall, the air circulation sounds may be noticeable. I Noise of Compressor. This operating sound happens when the compressor compresses the refrigerant. The compressor rotates at 3600 RPM. The sound of compressor large refrigerators make more noise than small ones

Click sounds

10 LEVER(SWITCH) 11 FUNNEL 12 FUNNEL GUIDE
13 ROCKER SWITCH 14 SOLENOID ASSEMBLY 15 SPRING 16 LEVER HOLDER 17 DUCT CAP
19 DISPENSER LEVER 20 BUSHNIG CAP
21 BUTTON ASSEMBLY 22 BUTTON 23 BUTTON HOLDER

24 DRAIN GRILLE

17 Cap Assembly, Duct Detailed Drawings

- 113 -

FREEZER DOOR PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT

* : Optional part

205A 205E

210A 205C

205B 210B *

210B * 205F

- 114 -
REFRIGERATOR DOOR PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**

232A 147C *

147B 242B 147A

242C 242A

242D 242B

242C 242A*

- 115 -
REFRIGERATOR DOOR PART: LRSC26980TT

238A 260B

- 116 -
FREEZER COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT
270A 270C 402A 271B 271A 137A
136D 403A 136C 128G* 152A 136B 329A 135A
128H* 128C* 400A 302B 128C 128D* 130A 128E 121A * 128F 139B* 403C 403D * 120B * 401A *

120C *

272A 103A 408A

127B *

135B * 125A * 312A

126A *

- 117 -
REFRIGERATOR COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**
146B* 270B 270D 402A 271B 271C 624D 624B 141B 624C 171B 140C 146A * 171A 141A

624A 141C 116A 115A 152A

170A 142A 142D 152A 401A * 142B 142C

151A 177A

150A 177B 155A * 145A

145A 272B 166B

167C 409B
504A* 150B 162A * 167A* 167B 162B * 120E*

- 118 -

REFRIGERATOR COMPARTMENT: LRSC26980TT
146B* 270B 207B 270D 402A 271B 271C 624D 624B 141B 624C 171B 140C 146A * 171A 141A

- 119 -

ICE & WATER PART: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT

625A 618A 616E

616F 616G 616D

621C 404A

612A 612C

612B 610A 611A

621B 613A

600B 606A

- 120 -
MACHINE COMPARTMENT: LRSC26920**, LRSC26922**, LRSC26930**, LRSC26944**, LRSC26980TT