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LG GR-J303TS Service Manual

Kimchi refrigerator gr-j303t series
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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-J303T*
http://biz.lgservice.com

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  Summary of Contents for LG GR-J303TS

  • 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-J303T*...
  • Page 2: Safety Instructions

    SAFETY INSTRUCTIONS 1. Firstly check that there is electrical leakage in the main body of the product. 2. Perform work always after removing the power plugs in handling with the part where electricity conducts through. 3. Wear a rubber gloves(insulation gloves) for preventing electrical shock accident in case of testing with power on. 4.
  • Page 3: Product Specifications

    1. PRODUCT SPECIFICATIONS 1-1. GR-J303T* MODEL GR-J303TG GR-J303TS ITEMS SPEC SPEC 115V/60Hz 115V/60Hz Rating 300 L 300 L Net Capacity 156 L 156 L Top Compartment Capacity Middle/Bottom 144 L 144 L Compartment 667(W) X 670.4(D) 1775(H)mm 667(W) X 670.4(D) 1775(H)mm...
  • Page 4 ITEMS SPEC SPEC P.T.C P6R8MD P6R8MD Overload Protector 4TM314TFB 4TM314TFB Fan Motor(Top) Ø110 Fan Ø110 Fan Fan Motor(Middle) Ø110 Fan Ø110 Fan Condenser Ø110 Fan Ø110 Fan Cooling Fan Motor Electrical 115 V 140 W 115 V 140 W Defrosting System Heater Middle...
  • Page 5: Circuit Diagram

    2. CIRCUIT DIAGRAM - 5 -...
  • Page 6: Micom Function And Explanations Of Circuits

    3. MICOM FUNCTION AND EXPLANATIONS OF CIRCUITS 3-1. EXPLANATION OF FUNCTION 3-1-1. DISPLAY PART (1) BEST MODEL(GR-J303TG) (2) BETTER MODEL(GR-J303TS) Cabbage/Radish/ Mul Kimchi Vegetble/ Fruit Light Freezing Frozen Food Chilled Food NOTCH Max Max Temperature 1.0°C -0.5°C -2.0°C 4.5°C 3.5°C 2.5°C -4.0°C -5.0°C -6.0°C -15°C -18°C -21°C -25°C 5.0°C 2.0°C 0.0°C setting 1.
  • Page 7 3-1-2. Food storage/seasoning function (1) When selecting food type and storage temperature 1. Press the “Lock/Unlock” button for more than 2 seconds to “Unlock” the refrigerator. 2. When you press the “Uppper compartment”, ”Store” button in this condition, the storage temperature level changes from “Mid”...
  • Page 8 3-1-3. Rhythm fermenting control pattern diagram 1. The fermenting control pattern varies, depending on the temperature of the Kimchi when it is placed into the storage, the type of Kimchi being made and the degree of the seasoning selected. 2. In the 1st seasoning cycle, if the Kimchi is at room temperature, the cold control operates. 3.
  • Page 9 3-1-4. TEMPERATURE CONTROL AT UPPER, MIDDLE AND LOWER COMPARTMENT (1) Temperature control at upper compartment 1. Turn COMP, upper compartment fan motor depending on temperature of the upper compartment sensor and cool them by opening the 3-way valve to the upper compartment. 2.
  • Page 10 3-1-7. FRONT-C HEATER CONTROL 1. A heater for prevention of dewing is installed on the FRONT-C part between the middle compartment and the lower compartment, and turns on at the time of COMP ON and for 20 minutes after COMP OFF. 2.
  • Page 11 3-1-12. SEQUENTIAL OPERATION OF ELECTRICAL PARTS Electrical parts such as COMP, defrosting heater at the upper & middle compartment, fan motor at the upper & middle compartment, single motor damper and FRONT-C heater sequentially operate as followers for preventing noise and damage of parts occurred by that various parts operate at the same time in input of initial power on and after test closing (including temporary power failure, either): Function...
  • Page 12 3. The product returns to normal operation if failure is released during display of failure code in occurrence of failure (RESET). 4. LEDs other than failure code turn off in occurrence of failure. BEST MODEL (GR-J303TG) BETTER MODEL (GR-J303TS) Failure Display Item (Food LED) Remarks Failures...
  • Page 13 (2) Load Operation in Failure Classification DEFROSTING DEFROSTING UPPER MIDDLE STEPPING SINGLE ITEM HEATER OF HEATER OF 3-WAY FRONT-C COMP COMPARTMENT COMPARTMENT MOTOR MOTOR UPPER MIDDLE VALVE HEATER DAMPER DAMPER COMPARTMENT COMPARTMENT Normal Failure of 15 min Upper compartment 15 min (K1) sensor Failure of 15 min...
  • Page 14 3-1-14. TEST FUNCTION 1. Test function is intended to check function of PCB and the product and find a failure part with failure status. 2. The test S/W exists on the main PCB, and ends the test mode after 2 hours irrespective of the test mode, and then returns to normal status.
  • Page 15 3-2. EXPLANATION OF CIRCUITS 3-2-1. POWER CIRCUIT Power circuits consist of SMPS (Switching Mode Power Supply) power, and the SMPS consists of the rectification part (BD1, CE1) to convert AC voltage to DC voltage, the switching part (IC3) to switch the converted DC voltage, a transformer to transfer energy of the primary side on the switching terminal, secondary side power to supply power to the MICOM and IC and the feed back part (IC4, IC5) to feedback the secondary side voltage to the primary side of transformer in order to maintain it uniformly.
  • Page 16 3-2-4. LOAD/BUZZER DRIVE CRICUIT (1) Load Drive Circuit COMP, UPPER UPPER MIDDLE MIDDLE MIDDLE LOWER SINGLE FRONT-C Type of Load Mechanical DEFROST DEFROST FERMENT FERMENT MOTOR HEATER Area FAN MOTOR HEATER MOTOR HEATER HEATER HEATER DAMPER Measuring Point(IC7) No.10 No.16 No.12 Q1 Collector No.11...
  • Page 17 (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) Status Ex) Lock: "Ding-D-Dong" sound Ex) Lock: "Ding-D-Dong" sound Measuring point 45ms 45ms 45ms 45ms 70ms 750ms...
  • Page 18 3-2-6. TEMPERATURE SENSING CIRCUIT (LED:6871JB1400, LCD:6871JB1399) Above circuits consist of the upper sensor, middle sensor, lower sensor for adjusting setup temperature at the upper, middle and lower compartment, the ambient temperature sensor to detect ambient air temperature, the upper defrost sensor and the middle defrost sensor attached to the evaporator at the upper, middle compartment to detect the defrost return temperature.
  • Page 19 3-2-7. TEMPERATURE SENSING CIRCUIT 1.Temperature adjustment at the lower compartment consists of the circuit part for driving the damper, as electronic single motor damper, to open or close the baffle and the reed switch part to detect open/close status of the damper. 2.
  • Page 20 3-2-8. STEPPING MOTOR DAMPER DRIVE CIRCUIT (FOR TEMPERATURE CONTROL AT MIDDLE COMPARTMENT) As for motor drive, the motor rotates since rotation magnetic force is formed at coils wound around each phase of the motor and the stator if outputting “High” “Low” signal as much as the fixed step numbers through the MICOM pin 51 and pin 52 after applying “High”...
  • Page 21 3-2-9. 3-WAY VALVE STEPPING MOTOR DRIVE CIRCUIT (FOR SWITCHING UPPER/MIDDLE/LOWER COMPARTMENT CYCLE) As for motor drive, the motor rotates since rotation magnetic force is formed at coils wound around each phase of the motor and the stator via the IC11 (TD62308AP) as IC for motor drive if outputting “High” “Low” signal as much as the fixed step numbers from the MICOM pin 50, 47 and 48.
  • Page 22 3-2-10. KEEPING TEMPERATURE COMPENSATION AND TOO COLD/ TOO WARM CUT COMPENSATION CIRCUIT (1) Keeping Temperature Compensation Circuit 16.2KF (UPPER COMPARTMENT SENSOR) MIDDLE COMPARTMENT KEEPING TEMPERATURE COMPENSATION LOWER COMPARTMENT KEEPING TEMPERATURE COMPENSATION u This circuit is used for entering the required level of temperature compensation into MICOM to adjust keeping temperature at the upper, middle and lower compartment.
  • Page 23 u Temperature compensation table at the upper compartment is as follows: Modification RCF1:3 K RCF1:2.4 K RCF1:1.8 K RCF1:1.2 K RCF1:620 RCF1: RCF1: RCF1: RCF1: RCF1: RCF1: Division RCF2: RCF2: RCF2: RCF2: RCF2: RCF2: RCF2:1.2 K RCF2:2.4 K RCF2:3 K RCF2:5.1 K RCF2:6.2 K Current...
  • Page 24 (2) Too Cold/Too Warm Cut Compensation Circuit. Upper compartment Upper Middle compartment Lower compartment compartment cut compensation cut compensation cut compensation Middle Lower temperature compartment compartment Too cold Too warm Too cold Too warm Too cold Too warm compensation temperature temperature compensation compensation...
  • Page 25 3-2-11. COMMUNICATION CIRCUIT BETWEEN MAIN PCB AND DISPLAY PCB Following circuits as communication circuits are circuits for changing necessary information between the main MICOM of the main PCB and the MICOM for LED control of the display PCB. DC12V for driving the display PCB, transmit/receive circuits are required. Poor communication occurs where continuing information change between the main MICOM of the main PCB and the MICOM for LED control of the display PCB is not done for more than 30 seconds.
  • Page 26 3-3. SENSOR RESISTANCE CHARACTERISTICS TABLE Measuring Temperature(°C) Upper/Middle/Lower sensors, RT sensor, Upper/Middle defrosting sensors -20 °C 77 K -15 °C 60 K -10 °C 47.3 K -5 °C 38.4 K 0 °C 30 K +5 °C 24.1 K +10 °C 19.5 K +15 °C 15.9 K...
  • Page 27 3-4. PCB PARTS DIAGRAM AND LIST 3-4-1. PWB(PCB) ASSEMBLY, MAIN(LED MODULE TYPE) (1) Parts diagram 6871JB1129 "W" - 27 -...
  • Page 28 (2) Parts List - 28 -...
  • Page 29 SRT ASSEM - 29 -...
  • Page 30 3-4-2. PWB(PCB) ASSEMBLY, DISPLAY [STANDARD] (1) Parts diagram (2) Parts List - 30 -...
  • Page 31 3-5. PCB CIRCUIT DIAGRAM – PCB CIRCUIT DIAGRAM MAY CHANGE DEPENDING ON SITUATION. 3-5-1. PWB (PCB) ASSEMBLY, MAIN CIRCUIT DIAGRAM (LED MODULE TYPE) - 31 -...
  • Page 32 (LCD: 6871JB1464, LED: 6871JB1465) - 32 -...
  • Page 33 3-5-2. PWB (PCB) ASSEMBLY, DISPLAY CIRCUIT DIAGRAM (LCD: 6871JB1464, LED: 6871JB1465) - 33 -...
  • Page 34: Exploded View And Service Parts List

    4. EXPLODED VIEW AND SERVICE PARTS LIST 4-1. EXPLODED VIEW u u GR-J303T* 501F 281A 281B 103A 411A 103B 410G 619B 501A 401A 404A 501K 301A 405C 405A 329A 610E 418A 304A 108A 282B 406B 330B 332B 401B 605A 109B 301B 184C 105B...
  • Page 35 u u GR-J303TG 149A 155C 155A 155B 149B 150A 150C 157A 150G 201A 203A 150D 150B 157B 157C 206A 150F 157D 150E 239A 207A 155C 155A 205A 205D 155B 212A 150A 150C 150G 150D 150B 150F 150E 206B 202A 204C 153C 153A 153B...
  • Page 36 GR-J303TS 140A 149C 157A 150A 201A 203A 157B 157C 206A 157D 239A 207A 205A 205D 150A 212A 279A 154B 206B 202A 154A 204C 150B 205D 205A - 36 -...
  • Page 37 GR-J303TG/GR-J303TS 604E 241A 604G 253C 251A 203B 248A 253B 205H 205A 160C 244A 205J 205A 201B 252C 252A 604G 604E 241B 252B 253C 253A 203C 253B 205H 205A 160C 248B 244A 205J 253C 205A 254A 201C 254B - 37 -...
  • Page 38 u u GR-J303TG/TS 253C 253A 253B 128B 252C 252A 252B 252C 252A 252B - 38 -...
  • Page 39 4-2. SERVICE PARTS LIST u u GR-J303TG PTNO LOC. Description GR-J303TG 103A Handle,Rear 3650JA2061W 103B Handle,Rear 3650JA2061X 103C Cover,Lower 3550JA0121A 104A Leg Assembly,Frame AFC30700601 104B Leg Assembly,Frame AFC30700602 105A Tube Assembly,Drain 5251JA2006A 105B Tube Assembly,Drain 5251JA3003D 106A Leg,Adjust 4778JA2016D 106A Leg,Adjust 4778JA2016D 108A...
  • Page 40 PTNO LOC. Description GR-J303TG 204C Cap,Decor Freezer 5078JA0072A 205A Cap,Handle 5006JA3098C 205D Holder,Handle 4930JA2114A 205E Holder,Handle 4930JA2114B 205H Holder,Handle 4930JA2115A 205H Holder,Handle 4930JA2115A 205J Holder,Handle 4930JA2115B 205J Holder,Handle 4930JA2115B 206A Decor,Door 3806JA1205A 206B Decor,Door 3806JA1206C 207A Frame Assembly,LCD 3210JA1082Q 212A Handle Assembly,Freezer AED30620702 239A...
  • Page 41 PTNO LOC. Description GR-J303TG 317A Drier Assembly 5851JA2002T 318A Holder,Drier 4930JA3034A 319A Tray,Drip 3390JA0008B 319C Guide,Fan 4974JA1036B 319D Bracket,Valve 4810JA2139A 323B Condenser Assembly,Wire 5403JA1044A 327B Damper 5040JA3063A 328A Damper,Pipe 4J03020A 329A Fan Assembly 5901JA1014A 329B Fan Assembly 5901JA1007A 329C Fan Assembly 5901JA1013A 330B Shroud Assembly,Freezer...
  • Page 42 GR-J303TS PTNO LOC. Description GR-J303TS 103A Handle,Rear 3650JA2061W 103B Handle,Rear 3650JA2061X 103C Cover,Lower 3550JA0121A 104A Leg Assembly,Frame AFC30700601 104B Leg Assembly,Frame AFC30700602 105A Tube Assembly,Drain 5251JA3003D 105B Tube Assembly,Drain 5251JA2006A 106A Leg,Adjust 4778JA2016D 106A Leg,Adjust 4778JA2016D 108A Tray Assembly,Drain...
  • Page 43 PTNO LOC. Description GR-J303TS 239A Name Plate 3846JD1007B 241A Basket,Door 5004JA0007C 241B Basket,Door 5004JA0006B 244A Handle,Freezer 3650JA1245D 244A Handle,Freezer 3650JA1245D 245A Barrier Assembly,Insulation 4791JA1036J 248A Rail Assembly,TV 5219JA1004G 248B Rail Assembly,TV 5219JA1004H 251A Bucket Assembly,Side Dish 5075JA1030F 252A Bucket Assembly,Side Dish...
  • Page 44 PTNO LOC. Description GR-J303TS 328A Damper,Pipe 4J03020A 329A Fan Assembly 5901JA1014A 329B Fan Assembly 5901JA1007A 329C Fan Assembly 5901JA1013A 330B Shroud Assembly,Freezer 4999JA1017B 331D Shroud,Freezer MHN30354101 332B Grille Assembly,Fan 3531JA1021C 332C Grille Assembly,Fan 3531JA1022A 401A Controller Assembly 6615JB2005D 401B Controller Assembly...
  • Page 45 GR-J303TG/TS PTNO LOC. Description GR-J303TG GR-J303TS 128B Shelf, Freezer 5026A1176C 252A Bucket, Assembly, Side Dish 5075J1024E 252B Bucket, Side Dish 5074JA1043C 252C Cover Assembly, Bucket 3551JA1052E 253A Bucket Assembly, Side Dish 5075JA1023E 253C Bucket, Side Dish 5074JA1042C 253C...
  • Page 46 P/No. 3828JD8947B JAN., 2007 Printed in Korea...

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