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LG GR-K192AF Service Manual

Kimchi refrigerator
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KIMCHI REFRIGERATOR
SERVICE MANUAL
CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL
BEFORE CHECKING OR OPERATING THE REFRIGERATOR.
MODEL : GR-K192AF
http://biz.lgservice.com

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  Summary of Contents for LG GR-K192AF

  • Page 1 KIMCHI REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR. MODEL : GR-K192AF...
  • Page 2: Table Of Contents

    Safety regulations 1. First check if there is any electric leakage in the refrigerator unit. 2. Always unplug the refrigerator before handling any electricity conducting parts. 3. When testing the refrigerator with the power on, use insulated gloves for safety. 4.
  • Page 3: Safety Warnings And Cautions

    Safety warnings and cautions Chapter 1. Safety warnings and cautions u Always observe the ‘Safety Warnings’ and ‘Cautions’, which hare intended to ensure safety while repairing or operating the product. u Precautions are classified into ‘Warning’ and ‘Caution’, as explained below. w Warning Warning means a dangerous condition which could result in significant damage, injury or death if the instructions are not followed.
  • Page 4 Safety warnings and cautions w Warning This product should always be Do not store flammable liquid or gas in grounded, when needed. the refrigerator such as ether, benzene, alcohol, medicine, LP gas etc. If you think that there is a possibility of electricity leakage by water or moisture, always ground the unit.
  • Page 5 Safety warnings and cautions w Caution When using the refrigerator for low Always use exact replacement parts. temperature in freezer or refrigerator, Make sure that the model name, voltage, current and do not store bottles. temperature ratings are correct for the electric part. Bottles can freeze and cause the bottles to crack, which can cause an injury.
  • Page 6: Product Specification

    Product specification Chapter 2. Product specification 2-1. GR-K192AF GR-K192AF Item SPEC Usable volume 188.8Li Left compartment Volume 94.3Li Right compartment 94.3Li Width 922mm External Depth 699mm dimensions Height 883mm 66kg Total weight 115W Motor power consumption Direct cooling Cooling method...
  • Page 7: Product Installation Method

    Product installation method Chapter 3. Product installation method 3-1. Method to adjust height of refrigerator First adjust the level of the refrigerator. (If the floor is uneven, the refrigerator may vibrate or cause noise.) Horizontal adjustment leg (lower handle part) u Adjust the front to be leveled by turning the height adjustment screws under the front corners in the arrow direction.
  • Page 8: Circuit Diagram

    Circuit diagram Chapter 4. Circuit diagram - 8 -...
  • Page 9: Micom Function And Circuit Description

    MICOM function and circuit description Chapter 5. MICOM function and circuit description 5-1. Function description 5-1-1. Display part Kimchi srore Vegetable/Fruit Light freezing Freezing food Notch Temperature 0°C -1.0°C -2.0°C 3.5°C 2.5°C 1.5°C -4.0°C -5.0°C -6.0°C -5°C -18°C -21°C 1. When the power is connected for the first time, it is set to “Lock”, “Left compartment-Cabbage Kimchi-Mid” and “Right compartment-Cabbage Kimchi-Mid”.
  • Page 10 MICOM function and circuit description 5-1-2. Food storage/seasoning function (1) When selecting food type and storing temperature 1. Press the “Lock/Unlock” button for more than 2 seconds to switch to “Unlock” status. 2. Press the “Kimchi store” button to select “Mid” ’ “Max” ’ “Min” ’ “Mid”, “Vegetable / Fruit” button “Mid” ’ “Max” ’ “Min” ’...
  • Page 11 MICOM function and circuit description 5-1-3. When selecting power on/off function 1. Press the "Lock/Unlock" button for more than 2 seconds to switch to "Unlock" status. 2. At this time, press the "Power" button for more than 2 seconds to turn the power off. 3.
  • Page 12 MICOM function and circuit description 5-1-5. Temperature control method 1. The compressor runs or stops and the 3-way valve opens or closes depending on the temperature sensed in the left and right compartment. 2. If the temperature in either compartment is unsatisfactory, the compressor is turned on and the 3-way value is opened to the affected compartment.
  • Page 13 MICOM function and circuit description 5-1-8. Operation in response to ambient temperature The storage senses the ambient temperature and adjusts the temperature in the compartments accordingly. This keeps the storage from being too cold or too warm because of seasonal variations and maintains exact temperatures in the compartments.
  • Page 14 MICOM function and circuit description 5-1-10. Error diagnosis function 1. The error diagnosis function is the function to support SVC in case of an error that can affect the performance of the product. 2. If an error occurs, the control panel button will not work. 3.
  • Page 15 MICOM function and circuit description 5-1-11. Test function 1. The test function checks the functions of the PCB and the refrigerator, searching for errors in parts. 2. The test switch on the PCB operates the test mode. The refrigerator reverts to the normal mode after 2 hours if you forget to end it manually.
  • Page 16 MICOM function and circuit description 5-2. Circuit description 5-2-1. Power circuit The power circuit consists of the noise attenuation part and the SMPS (Switch Mode Power Supply) part. The SMPS consists of the rectifier (BD1 & CE1) to convert AC voltage to DC voltage, switching part (IC3) to switch the converted DC voltage, transformer to transmit energy of the first side of the switching end to the second side, the secondary power to supply power to MICOM and IC, and the feedback part (IC4) to feedback the secondary voltage to the first side of the transformer in order to maintain the secondary voltage constant.
  • Page 17 MICOM function and circuit description 5-2-4. Load/Buzzer driving circuit (1) Load driving circuit Type of load COMP. fan motor Left seasoning heater Right seasoning heater Measuring point (IC7) Within 1V Status (2) Buzzer driving circuit (located on display PCB) g Only the buzzer sound for the Lock/Unlock operation is shown in this SVC technical manual. LED MODULE TYPE (INT1) (PWM3/TC3/PDO3)
  • Page 18 MICOM function and circuit description 5-2-5. Switch input circuit The following circuit is the input circuit to detect the test switch signal to check the refrigerator. 5-2-6. Temperature sensor circuit The following temperature sensor circuit consists of a sensor to detect the outside (ambient) temperature and sensors in the left and right compartments for storing and seasoning Kimchi.
  • Page 19 MICOM function and circuit description 5-2-7. Stepping motor operation circuit (3-way valve) u The motor is operated by sending out "High" and "Low" signals as many as the designated number of steps through MICOM Pin 15, 16, 17, 18 to rotate the motor through the magnetic field formed by the motor and the coil wrapped around each stator.
  • Page 20 MICOM function and circuit description 5-2-9. Storing temperature compensation and over-cool/under-cool cut compensation circuit (1) Storing temperature compensation u This is the circuit to input the temperature compensation level required for adjusting storage temperature at the left or right compartment. Left compartment Right compartment Temperature...
  • Page 21 MICOM function and circuit description (2) Over-cool/Under-cool cut compensation Left compartment cut compensation Right compartment cut compensation Left compartment storing Right compartment storing Over-cool Under-cool Over-cool Under-cool compensation compensation compensation compensation temperature compensation temperature compensation JCL1 JCL2 JCR1 JCR2 +1°C +1°C -1°C -1°C...
  • Page 22: Main Pcb

    MICOM function and circuit description 5-2-10. Communication circuit between main PCB and display PCB This circuit provides communications between the MICOM on the main PCB and the MICOM of the display PCB. If there is no communication between these boards for 30 seconds, a communication error occurs. MAIN PCB DISPLAY PCB DC 12V...
  • Page 23 MICOM function and circuit description 5-2-11. Button input and display part illumination circuit This circuit determines which buttons are pressed and drives the LED display, whose driving method is a scan method. - 23 -...
  • Page 24: Sensor Resistance Characteristics Table

    MICOM function and circuit description 5-3. Sensor resistance characteristics table Measuring temperature (°C) Left sensor, right sensor, outside sensor -20°C 77 KΩ -15°C 60 KΩ -10°C 47.3 KΩ -5°C 38.4 KΩ 0°C 30 KΩ +5°C 24.1 KΩ +10°C 19.5 KΩ +15°C 15.9 KΩ...
  • Page 25 MICOM function and circuit description 5-4. PCB parts diagram and parts list 5-4-1. PWB (PCB) assembly and main parts diagram (The parts diagram can slightly change according to the situation.) - 25 -...
  • Page 26 MICOM function and circuit description 5-4-2. PWB (PCB) assembly and main parts list g The parts list can slightly change according to the situation. - 26 -...
  • Page 27 MICOM function and circuit description 5-4-3. PWB (PCB) assembly and display parts diagram and parts list g The parts list can slightly change according to the situation. - 27 -...
  • Page 28 MICOM function and circuit description 5-5. PCB circuit diagram 5-5-1. PWB (PCB) assembly and main circuit diagram g PCB circuit diagram can slightly change according to the situation. - 28 -...
  • Page 29 MICOM function and circuit description - 29 -...
  • Page 30 MICOM function and circuit description 5-5-2. PWB (PCB) assembly and display circuit diagram (6871JB1462) g The circuit diagram can slightly change according to the situation. g This includes the PWB (PCB) assembly and sub circuit diagram. - 30 -...
  • Page 31: Freezing Cycle And Refrigerant

    Freezing cycle and refrigerant Chapter 6. Freezing cycle and refrigerant 6-1. Freezing cycle (Freezing principle/Refrigerant gas circulation diagram) 6-1-1. Freezing principle Freezing is an operation of maintaining a lower temperature (generally 0°C) than the natural temperature (usually ambient temperature surrounding us). This requires an insulated space, refrigerant (R134a) to absorb the heat and the circulation circuit (compressor, condenser, evaporator etc.) to operate the phase change of the refrigerant.
  • Page 32 Freezing cycle and refrigerant 6-1-3. Operation description of each circulation circuit Parts name Operation details Refrigerant gas condition (input and output) Compressor Compress the refrigerant from low pressure Low pressure gas-->High pressure gas (0kg/cm ) to high pressure (8-12kg/cm (0kg/cm ) (8~12kg/cm Temperature (30°C) ¡...
  • Page 33: General Details About The Product

    General details about the product Chapter 7. General details about the product 7-1. Refrigerator noise The structure of the freezing room and mechanical room, which are the sources of Kimchi refrigerator noise, is as follows. Here you can see that the main source of noise during refrigerator operation is the compressor, the condenser and the fan motor that cools the compressor in the mechanical room.
  • Page 34 General details about the product (2) Service method for major noise claim item for Kimchi refrigerator Noise claim Noise generation Service method Remarks Noise from poor • Reinforce the floor hardness u The installation floor surface is installation • Move the installation location not hard enough •...
  • Page 35: Major Repair Method For Freezing Cycle

    (BOMBE) managed. (manufactured - End socket: 2SV plug: Use the proper one for by LG) 2PV R134a Note) When welding the connection part of both ends, make sure the internal O ring (rubber) does not burn.
  • Page 36 60 minutes. - Vacuuming speed: 113/l/min - Measure the bombe exclusively provided by LG for R134a within Bombe for R134a (mass Charge the regulated value ±5g using an electric weight and insert it to...
  • Page 37 Major repair method for freezing cycle 8-3. Caution during major repair Item Caution 1. Using tools 1) Use the parts and tools for R134a. 2. Removing residual 1) When removing the residual refrigerant always turn the refrigerator off and then wait for refrigerant more than 5 minutes.
  • Page 38 Major repair method for freezing cycle 8-4. Actual major repair work Item Caution 1. Removing residual Key Point Evaporator refrigerant Maintain refrigerant removing order Drier (Oil can leak from Low pressure compressor) side High pressure 3-Way side Valve Condenser Hot Line Pipe 1.
  • Page 39 Major repair method for freezing cycle Item Caution 4. Vacuuming Evaporator Compressor Drier High pressure 3-Way Valve side Condenser Hot Line Pipe High pressure pressure Blue Yellow Key Point Vacuum - When vacuuming, pump connect the power to increase the vacuum Connecting the pipe effect.
  • Page 40 Major repair method for freezing cycle Item Caution 5. Charging the refrigerant Evaporator Compressor Drier 3-Way High pressure Valve side Condenser Hot Line Pipe 4) Charging the refrigerant: As shown above, operate the compressor and charge the refrigerant with the charging pipe. 5) When the charging is complete, pinch the charging pipe using the pinch-off plier.
  • Page 41 Major repair method for freezing cycle 8-6. Welding reference diagram Evaporator Evaporator (Right compartment) Accumulator (Left compartment) Suction Pipe Hot Line Pipe 3-Way Valve Drier Condenser Welding classification Applied parts Remarks Copper 1,2,3,7,10,13,14,17,20,21,22,24,25,26,27 Silver 4,5,6,8,9,16 LOKRING 11,12,18,19 - 41 -...
  • Page 42 Major repair method for freezing cycle 8-7. Problem checking procedure Compressor rotates Check the rotation Check right side Wall is cold Normal of compressor cooler Slightly cold Moisture clogged Poor operation of 3-way valve Right side cycle Capillary tube Wall is not cold clogged clogged Valve housing not...
  • Page 43 Major repair method for freezing cycle 8-8. Caution for major repair service 8-8-1. Cycle clogged and leaking When exchanging parts, welding or resealing the refrigerant from the cycle being clogged or leaking, always exchange the drier to remove the moisture within the cycle. Repair clogged part Cycle clogged and Vacuum and seal...
  • Page 44: Characteristics Of Each Part

    Characteristics of each part Chapter 9. Characteristics of each part 9-1. Cycle part function and operating principle 9-1-1. Compressor function and operating principle (Back and forth movement type) Piston Motor part Motor supporting spring Lubricant Compressor is composed of the piston part compressing the refrigerant gas from low to high pressure, the motor part for the operation, and lubricant to accelerate the cooling process and to lubricate the movement.
  • Page 45 Characteristics of each part 9-1-2. Overload protection relay (O.L.P) structure and function • The overload protection relay cuts the power to protest the motor when the temperature of the compressor rises abnormally or when the overly high current is sent to the compressor motor. •...
  • Page 46 Characteristics of each part 9-1-4. Refrigerant valve (1) Function This switches the refrigerant that went through the compressor to the left or right compartment evaporator. Evaporator Refrigerant CAPILLARY TUBE (Left compartment) valve (Left compartment) Compressor CAPILLARY TUBE (Right compartment) Evaporator Suction pipe (Right compartment) (2) Operating structure...
  • Page 47 Characteristics of each part (3) Operating principle Controlling the rotating angle of the stepping motor will open/close the outlet pipe entrance by changing the shape of the valve connected to the bottom of the rotor. Left/Right compartment Right compartment Left/Right compartment Left compartment open open...
  • Page 48 Characteristics of each part 9-1-5. Motor (mechanical room) (1) Function • Motor cooling (mechanical room) This is the part used for circulating the air within the mechanical room and applies to the wire condenser type. This operates when the compressor operates and the heated refrigerant from the compressor lowers the temperature when passing through the wire condenser and also reduces the temperature of the compressor to improve the performance.
  • Page 49 Characteristics of each part • Operating principle When the AD power is connected to the coil of the shading pole motor, the central axis of the magnetic field shifts in the bold Current arrow direction of <Fig. 2>. As the central axis moves, the rotor moves in the same direction to turn the motor.
  • Page 50 Characteristics of each part 9-1-6. Heater (1) Introduction When using the refrigerator to realize the fermenting algorithm program, a Kimchi seasoning heater is attached on the external surface of the inner case. (2) Heater type and role Classification Applied part Function Resistance value Remarks...
  • Page 51 Characteristics of each part 9-1-7. Capacitor operating principle and temperature characteristics (1) Function 1. Capacitor (C/S): Sometimes called the starting capacitor, it is used to improve the motor operation characteristics in low pressure because the operating torque is weak based on the characteristics of the motor within the compressor of the refrigerator in low voltage areas (85% or less than rated).
  • Page 52: Cautions For Disassembling The Product

    Cautions for disassembling the product Chapter 10. Cautions for disassembling the product 10-1. PWB (PCB) assembly, main • When disassembling the PWB (PCB) assembly, main located in the mechanical room, be careful so that the lead wires do not touch the edge part. •...
  • Page 53: Assembly Diagram And Service Parts List

    Assembly diagram and service parts list Chapter 11. Assembly diagram and service parts list 11-1. Assembly diagram (GR-K192AF) 222A 281C 281B 233A 200A 230A 230B 233A 221A 281E 281D 233A 243A 200B 203A 243A 233A 641H 604A 410G 243A 319A...
  • Page 54 Assembly diagram and service parts list 147C 249G 147A 248D 249D 249B 212D 248A 234B 234A 155D 270A 236B 207A 212G 236A 155C 102A 102A - 54 -...
  • Page 55 Assembly diagram and service parts list 11-2. Service parts list (GR-K192AF) LOC No.DESCRIPTION GR-K192AF 102A Leg,Adjust 4778JA2015A 147A Bucket,Side Dish(L) 5074JA1044C 147C Cover Assembly,Bucket 3551JA1053G 155C Decor,Case-R 3806JA1178G 155D Decor,Case-L 3806JA1178H 200A Door Foam Assembly,Freezer-L 5433JA0210D 200B Door Foam Assembly,Freezer-R...
  • Page 56 Assembly diagram and service parts list LOC No. DESCRIPTION GR-K192AF 310B Pipe Assembly,Joint 5201JA2049A 312A Damper,Compressor 5040JA3074A 314A Stopper,Compressor 4J03277A 315A Base Assembly,Compressor 3103JA1031A 315B Roller 3J02312A 315C Pin,Common 4J04238A 315D Plate Assembly,Bottom 3305JA2024B 317A Drier Assembly 5851JA2005E 319A Bracket,Motor...
  • Page 57 P/No. MFL31842102 DEC., 2006 Printed in Korea...