LG GR-K192AF Service Manual
LG GR-K192AF Manual
 |
View all LG GR-K192AF manuals
Add to My Manuals
Save this manual to your list of manuals |
LG GR-K192AF manual content summary:
- LG GR-K192AF | Service Manual - Page 1
http://biz.lgservice.com KIMCHI REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL BEFORE CHECKING OR OPERATING THE REFRIGERATOR. MODEL : GR-K192AF - LG GR-K192AF | Service Manual - Page 2
to avoid spills. Be especially careful for thin objects (glass sheet, book). 7. When the refrigerating cycle is damaged, always request service to the major repair service agency. (This is to prevent the house from getting dirty from the gas within the cycle.) 8. Always double check for repairs - LG GR-K192AF | Service Manual - Page 3
means a dangerous condition which could result in significant damage, injury or death if the instructions are not followed. w Caution Caution means a condition which could result in damage or injury if instructions are not followed. w Warning Use caution to prevent electric shock The control panel - LG GR-K192AF | Service Manual - Page 4
Safety warnings and cautions w Warning This product should always be grounded, when needed. If you think that there is a possibility of electricity leakage by water or moisture, always ground the unit. Do not store flammable liquid or gas in the refrigerator such as ether, benzene, alcohol, - LG GR-K192AF | Service Manual - Page 5
cause fire or electric shock. During repairs, remove all dust and foreign material from the housing part, connector part and check part. It can prevent problems such as tracking or short circuit. Allow at least 5 minutes for resetting if you unplug the refrigerator. If can cause an overload to the - LG GR-K192AF | Service Manual - Page 6
Product specification Chapter 2. Product specification 2-1. GR-K192AF Item Usable volume Volume Left compartment Right compartment External dimensions Width Depth Height Freeze cycle Total weight Motor power consumption Cooling method Store/Season Insulation material Fresh vegetable basket - LG GR-K192AF | Service Manual - Page 7
Product installation method Chapter 3. Product installation method 3-1. Method to adjust height of refrigerator s 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 - LG GR-K192AF | Service Manual - Page 8
Circuit diagram Chapter 4. Circuit diagram -8- - LG GR-K192AF | Service Manual - Page 9
MICOM function and circuit description Chapter 5. MICOM function and circuit description 5-1. Function description 5-1-1. Display part Notch Temperature Kimchi srore Min Mid Max 0°C -1.0°C -2.0°C Vegetable/Fruit Min Mid Max 3.5°C 2.5°C 1.5°C Light freezing Min Mid Max -4.0°C -5.0°C -6.0°C - LG GR-K192AF | Service Manual - 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", " - LG GR-K192AF | Service Manual - 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. At this time, all the LEDs in the - LG GR-K192AF | Service Manual - 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 - LG GR-K192AF | Service Manual - 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 - LG GR-K192AF | Service Manual - 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. - LG GR-K192AF | Service Manual - Page 15
. 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. 3. When the test mode is active, the buttons on the control panel are disabled but the buzzer still sounds a ding if one is pressed. 4. When - LG GR-K192AF | Service Manual - 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 - LG GR-K192AF | Service Manual - Page 17
1V 12V (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 49 P15 (INT1) 48 P14 (PWM3/TC3/PDO3) Status Measuring Ex) Lock: "Ding-D-Dong" sound Ex) Lock: "Ding-D-Dong" sound Off - LG GR-K192AF | Service Manual - 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) - LG GR-K192AF | Service Manual - 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 - LG GR-K192AF | Service Manual - 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 - LG GR-K192AF | Service Manual - Page 21
storing temperature compensation +1°C -1°C 0°C 0°C (Factory default) u The cut compensation circuit compensates the storing temperature of the left or right compartment by simply cutting it out of service for a brief period. - 21 - - LG GR-K192AF | Service Manual - Page 22
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 - LG GR-K192AF | Service Manual - 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 - - LG GR-K192AF | Service Manual - Page 24
MICOM function and circuit description 5-3. Sensor resistance characteristics table Measuring temperature (°C) -20°C -15°C -10°C -5°C 0°C +5°C +10°C +15°C ` +20°C +25°C +30°C +40°C +50°C Left sensor, right sensor, outside sensor 77 KΩ 60 KΩ 47.3 KΩ 38.4 KΩ 30 KΩ 24.1 KΩ 19.5 KΩ 15.9 - LG GR-K192AF | Service Manual - 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 - - LG GR-K192AF | Service Manual - 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 - - LG GR-K192AF | Service Manual - 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 - - LG GR-K192AF | Service Manual - 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. PWB(PCB) ASSEMBLY, MAIN - 28 - - LG GR-K192AF | Service Manual - Page 29
MICOM function and circuit description PWB(PCB) ASSEMBLY, DISPLAY - 29 - - LG GR-K192AF | Service Manual - 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 - - LG GR-K192AF | Service Manual - Page 31
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 - LG GR-K192AF | Service Manual - Page 32
refrigerant flowing. This can happen depending on the load condition of the refrigerator and on the evaporation, but it is not a problem. 6-2. Refrigerant Refrigerant Characteristics ODP GWP Remarks Because it does not include chloride, which cause ozone R134a destruction, it will not - LG GR-K192AF | Service Manual - Page 33
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 - LG GR-K192AF | Service Manual - Page 34
method for major noise claim item for Kimchi refrigerator Noise claim Noise generation Service method Remarks Noise from poor installation u The installation floor surface is not hard enough u The refrigerator is not leveled • Reinforce the floor hardness • Move the - LG GR-K192AF | Service Manual - Page 35
Major repair method for freezing cycle Chapter 8. Major repair method for freezing cycle 8-1. Major repair work standard for refrigerator using R134a refrigerant No. Work item Unit Work standard Objective Remarks 1 Opening time for pipe and piping parts Min Pipe part: Within 1 hour Compressor - LG GR-K192AF | Service Manual - Page 36
Major repair method for freezing cycle 8-2. Introduction to major repair work Work sequence Diagnose problem Major repair details Remove residual refrigerant - Cut the end of the drier part (high pressure side) and compressor charging part to remove the refrigerant. Work - LG GR-K192AF | Service Manual - Page 37
Major repair method for freezing cycle 8-3. Caution during major repair Item 1. Using tools 2. Removing residual refrigerant Caution 1) Use the parts and tools for R134a. 1) When removing the residual refrigerant always turn the refrigerator off and then wait for more than 5 minutes. (If you work - LG GR-K192AF | Service Manual - Page 38
Major repair method for freezing cycle 8-4. Actual major repair work Item 1. Removing residual refrigerant Low pressure side 2 Caution Evaporator Condenser Drier High pressure 3-Way side Valve 1 Key Point Maintain refrigerant removing order (Oil can leak from compressor) Hot Line Pipe - LG GR-K192AF | Service Manual - Page 39
Major repair method for freezing cycle Item 4. Vacuuming 5. Refrigerant charging Caution Evaporator Compressor 3 Condenser Drier High pressure 3-Way side Valve Hot Line Pipe 2 1 Low pressure Blue Yellow Red High pressure Vacuum pump Connecting the pipe Connect the red hose to the high - LG GR-K192AF | Service Manual - Page 40
Major repair method for freezing cycle Item 5. Charging the refrigerant Caution Evaporator Compressor Drier Bombe Condenser High pressure 3-Way side Valve Hot Line Pipe 4) Charging the refrigerant: As shown above, operate the compressor and charge the refrigerant with the charging pipe. 5) - LG GR-K192AF | Service Manual - Page 41
Major repair method for freezing cycle 8-6. Welding reference diagram Evaporator (Left compartment) 21 20 Accumulator Suction Pipe Evaporator (Right compartment) 14 13 3 25 26 17 22 10 3-Way Valve 8 Drier 24 27 16 9 5 7 6 4 2 Condenser 1 Hot Line Pipe Welding classification Copper - LG GR-K192AF | Service Manual - Page 42
clogged Capillary tube clogged Poor operation of 3-way valve Valve housing not inserted Main PWB housing not inserted Valve L/wire disconnected Valve problem Check left side cooler Wall is cold Wall is not cold Refrigerant leaking Welding part leaking Heat emitter leaking Check leaking part - LG GR-K192AF | Service Manual - Page 43
cover the body with a wet towel and minimize the heat transmission (below 100°C).) (Type with a joint pipe) 2) Valve exchange service (valve problem) You must do the service operation in the same method as above. 3) Other cautions 1. You must insert the capillary tube by 13 +1 -0 for - LG GR-K192AF | Service Manual - Page 44
(Back and forth movement type) Piston Motor part Motor supporting spring Lubricant Compressor is composed of the piston part compressing the pipe connected to the external heat emitter. Caution u The compressor for service is supplied with nitrogen gas charged and the rubber cap sealed. This - LG GR-K192AF | Service Manual - 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. • Overload - LG GR-K192AF | Service Manual - 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. Compressor Refrigerant Evaporator CAPILLARY TUBE (Left compartment) valve (Left compartment) CAPILLARY TUBE (Right - LG GR-K192AF | Service Manual - 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 open (STEP : 0) Right compartment open (STEP : 54) - LG GR-K192AF | Service Manual - 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 - LG GR-K192AF | Service Manual - 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 arrow direction of . As the central axis moves, the rotor moves in the same direction to turn the motor. Why - LG GR-K192AF | Service Manual - Page 50
For Kimchi seasoning 165Ω/EA Remarks (Applicable to R-K19**) (3) Poor product: Poor heater s Heater assembly (ferment/rice storage) Problem (parts) 1. Heat wire disconnected/connecting wire disconnected 2. Poor terminal contact Symptom Kimchi not seasoned Check method 1. Measure the resistance - LG GR-K192AF | Service Manual - Page 51
a capacitor and the basic structure is as shown in the right figure. A electrode Dielectric material (3) Poor symptom (product) B electrode Problem (parts) Symptom Disconnected (open) Shorted Normal 1) Compressor does not work. 2) Compressor is heated. 3) OLP is operating. 4) Power fuse is - LG GR-K192AF | Service Manual - Page 52
to apply too much pressure to damage the PWB (PCB) assembly, display or make scratches on frame display and case-U. g Depending on the mode, the service slot is on the top left or right side. Frame Display Case-U Deco, Case - 52 - - LG GR-K192AF | Service Manual - Page 53
parts list Chapter 11. Assembly diagram and service parts list 11-1. Assembly diagram (GR-K192AF) 243A 203A 243A 410G 410H 501A 502B 317A 323B 310B 315D 200A 222A 281C 233A 281B 233A 230A - LG GR-K192AF | Service Manual - Page 54
Assembly diagram and service parts list 248D 147C 147A 249G 249D 249B 212D 248A 234B 234A 270A 155D 236B 207A 212G 102A - 54 - 236A 155C 102A - LG GR-K192AF | Service Manual - Page 55
Assembly diagram and service parts list 11-2. Service parts list (GR-K192AF) LOC No.DESCRIPTION 102A Leg,Adjust 147A Bucket,Side Dish(L) 147C Cover Assembly,Bucket 155C Decor,Case-R 155D Decor,Case-L 200A - LG GR-K192AF | Service Manual - Page 56
Assembly diagram and service parts list LOCNo. DESCRIPTION 310B Pipe Assembly,Joint 312A Damper 317A Drier Assembly 319A Bracket,Motor 319C Bracket,Motor 323B Condenser Assembly,Wire 327A Damper,Motor Support 327B Damper,Pipe 329C Fan Assembly 410G Capacitor,Film,Box (CR) 410H Capacitor, Film, Box - LG GR-K192AF | Service Manual - Page 57
P/No. MFL31842102 DEC., 2006 Printed in Korea
-
1 -
2 -
3 -
4 -
5 -
6 -
7 -
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
-
20
-
21
-
22
-
23
-
24
-
25
-
26
-
27
-
28
-
29
-
30
-
31
-
32
-
33
-
34
-
35
-
36
-
37
-
38
-
39
-
40
-
41
-
42
-
43
-
44
-
45
-
46
-
47
-
48
-
49
-
50
-
51
-
52
-
53
-
54
-
55
-
56
-
57
 |
 |
CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS MANUAL
BEFORE CHECKING OR OPERATING THE REFRIGERATOR.
KIMCHI REFRIGERATOR
SERVICE MANUAL
MODEL : GR-K192AF