LG GN-U262 Service Manual
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LG GN-U262 Service Manual

LG GN-U262 Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GN-U262/292S
http://biz.lgservice.com

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Summary of Contents for LG GN-U262

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. MODEL: GN-U262/292S...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS..................................2 SERVICING PRECAUTIONS................................3 SPECIFICATIONS....................................4 PARTS IDENTIFICATION..................................5 DISASSEMBLY....................................6-7 DOOR......................................6 DOOR SWITCH.....................................6 FAN AND FAN MOTOR..................................6 DEF' CONTROL ASM..................................7 REFRIGERATOR ROOM LAMP................................7 CONTROL BOX-R..................................7 REPLACEMENT OF DOOR OPENING TYPE..........................8-9 ADJUSTMENT..................................10-11 COMPRESSOR..................................10 PTC-STARTER....................................10 OLP (OVER LOAD PROTECTOR)..............................11 CIRCUIT DIAGRAM..................................11 TROUBLESHOOTING................................12-17 COMPRESSOR AND ELECTRIC COMPONENTS..........................12...

  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS Air Recharging in Compressor vacuum operation is over, add the quantity in grams of R- 134a to the refrigerant system. Remember that every Test the refrigeration by connecting it electrically before system has an exact quantity of R-134a with a tolerance of refilling operation.

  • Page 4: Specifications

    1. SPECIFICATIONS 1-1 GN-U262 ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS FREEZER FREEZER 1 EA SHELF NET CAPACITY REFRIGERATOR REFRIGERATOR 2 EA ( l) TOTAL VEGETABLE TRAY Drawer Type GR-262S(V)Q 540(W) x 610(D) x 1530(H) EGG TRAY 1 Piece GN-262S(V)C/K DIMENSIONS GN-U262RL(V)C/K ICE TRAY...

  • Page 5: Parts Identification

    2. PARTS IDENTIFICATION FREEZER Cap Cover COMPARTMENT (Optional) Twisting Ice Serve (Optional) or General Type Ice Making Upper Hinge Freezer Temperature Freezer Door Rack Control Knob Cap Hinge (Optional) REFRIGERATOR COMPARTMENT Egg Storage Rack Chilled Compartment Refrigerator Temperature Electronic Control Lamp (GR-292 only) Deodorizer...

  • Page 6: Disassembly

    3. DISASSEMBLY 3-1 DOOR 3-2 DOOR SWITCH Freezer Door 1. To remove the door switch, pull out it with a 'Ñ' type 1. Remove the hinge upper by loosen the screw driver as shown in (figure 9). 2. Lift the freezer door 2.

  • Page 7: Def' Control Asm

    3-6 REFRIGERATOR ROOM LAMP 5. Disconnect the housing of lead wire. 6. Separate the Fan Assy. 1. Remove the cover lamp-R by pulling with a ' Ð ÐÐ ' type 7. Loose 2 screw fixed to the Bracket. driver. 8. Pull out Shroud-F remove the Fan Motor Assy. 2.

  • Page 8: Replacement Of Door Opening Type

    - Converting Door is Optional 3-8 REPLACEMENT OF DOOR OPENING TYPE Precaution 1. Before replacing the door opening type, first of all, you should take out foodstuffs and accessories like shelves or trays, and so on which are not fixed in the refrigerator.
  • Page 9 Reverse the position of the Assemble the lower hinge adjustable screw assembly Move the cap and bracket to the Move the cap to the opposite side and opposite side of the refrigerator door assemble the center hinge perpendicularly. Assemble the door stopper for the Assemble the door stopper for the Move the Cap Cover to the opposite side correct side of the freezer door...

  • Page 10: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 PTC-Applied Circuit Diagram According to Starting Method of Motor 펰 4-1-1 Role The compressor inhales low temperature and low pressure gas evaporated from Evaporator of the Refrigerator, and OVERLOAD PROTECTOR condenses this gas to high temperature and high pressure gas, and then plays delivering role to Condenser.

  • Page 11: Olp (Over Load Protector)

    4-3 OLP (OVER LOAD PROTECTOR) CONTACTING POINT 4-3-1 Definition of OLP COVER (1) OLP (OVER LOAD PROTECTOR) is attached to Hermetic Compressor and protects Motor by cutting off BIMETAL current in Compressor Motor by Bimetal in the OLP in case of over-rising temperature. (2) When over-voltage flows to Compressor motor, Bimetal CONTACTING POINT...

  • Page 12: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS Power Remove the PTC- (Rating Voltage Source. Starter from the ±10%)? Compressor and measure the voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC. No Voltage. OLP disconnected? Replace OLP. Check connection condition.

  • Page 13: Ptc And Olp

    6-2 PTC AND OLP Normal operation of Check another Observation value is Separate the PTC-Starter Compressor is 220V/50Hz : 22? ±30% electric from Compressor and 115V/60Hz : 6.8? ±30% impossible or poor. components. measure the resistance 240V/50Hz : 33? ±30% between No.

  • Page 14: Another Electric Component

    6-3 ANOTHER ELECTRIC COMPONENTS Cooling is impossible Compressor Check if current flows to Cause. doesn't run. the following components. a. Thermistor Poor contacting. b. Starting devices Shorted or broken. Poor contacting c. OLP or shorted. d. Compressor coil Coil shorted. Replace Poor contacting e.

  • Page 15: Service Diagnosis Chart

    6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Cooling is ¥ Is the power cord unplugged from the outlet? ¥ Plug to the outlet. impossible. ¥ Check if the power S/W is set to OFF. ¥ Set the switch to ON. ¥...

  • Page 16: Refrigerating Cycle

    6-5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer room and Low flowing sound of A little high ¥ A little Refrigerant LEAKAGE Refrigerator Refrigerant is heard and more than ¥...
  • Page 17 General Control of Refrigerating Cycle ITEMS CONTENTS AND SPECIFICATIONS REMARKS WELDING (1) H 30 ¥ Chemical Ingredients ¥ Recommend H34 containing 34% Ag in the (1) ¥ Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% ¥ Service Center. ¥ Brazing Temperature: 710~840¡C (2) Bcup-2 ¥...

  • Page 18: Description Of Function & Circuit Of Micom

    7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM The following description is basically for GR-262/GR-292. For the other models, refer to the diagram of the entire PCB Circuit. 7-1 FUNCTION 7-1-1 FUNCTION 1. When the appliance is plugged in, it is set to ‘Medium’. Each time the button is pushed, it is set to ‘Medium’...
  • Page 19 7-1-2 DEFROSTING 1. The defrosting is performed each time when the total running time of the compressor reaches 7 hours. 2. After the power is turned on (or restored after a power failure), the defrosting starts when the total running time of the compressor reaches 4 hours.
  • Page 20 7-1-4 ERROR DIAGNOSTIC MODE 1. The error diagnostic mode allows the SVC when a fault that may affect the performance of the product occurs while operating the product. 2. Even if the function control button is pushed when an error occurs, the function will not be performed. 3.
  • Page 21 7-2 PCB FUNCTION 7-2-1 POWER CIRCUIT The secondary part of the TRANS is composed of the power supply for the display and relay drive (12Vdc) and that for the MICOM and IC (5Vdc). The voltage for each part is as follows. PART VA 1 CE 2...
  • Page 22 7-2-2 OSCILLATION CIRCUIT This circuit is to generate 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 the authentic parts since the calculating time by the IC1 may be changed or it will not work if the OSC1 SPEC is changed.
  • Page 23 7-2-4 LOAD DRIVE CIRCUIT 1. Load Drive Condition Check Comp, Load Type Defrosting Heater Freezer Fan Motor Measurement Location 1V or below Condition - 23-...
  • Page 24 7-2-5 TEMPERATURE SENSOR CIRCUIT The upper CIRCUIT reads REFRIGERATOR temperature and DEF-SENSOR temperature for defrosting into MICOM. OPENING or SHORT state of each TEMPERATURE SENSOR are as follows. SENSOR CHECK POINT NORMAL(-30 °C ~ 50 °C) SHORT-CIRCUITED OPEN Refrigerator Sensor POINT Voltage 0.5 V ~ 4.5 V...
  • Page 25 7-2-6 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT 1. Refrigerator Temperature Compensation Refrigerator Resistance Temperature Remark (RCR1) Compensation 180 K ? +5.0 ¡C Compensation by raising the 56 K ? +4.0 ¡C temperature 33 K ? +3.0 ¡C 18 K ? +2.0 ¡C 12 K ? +1.0 ¡C...
  • Page 26 7-2-7 KEY BUTTON INPUT & DISPLAY LIGHT ON CIRCUIT ? The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on the corresponding function indication LED. The drive type is the scan type. - 26-...
  • Page 27 7-3. RESISTANCE SPECIFICATION OF SENSOR TEMPERATURE SENSOR RESISTANCE OF REFRIGERATOR (DEFROST) SENSOR - 20 ºC 77 K? - 15 û C 60 K? - 10 û C 47.3 K? - 5 û C 38.4 K? 0 û C 30 K? + 5 û...
  • Page 28 - 28-...
  • Page 29 - 29-...
  • Page 30 7-4 MAIN PWB ASS'Y AND PARTS LIST 7-4-1 MAIN PWB ASS'Y 1. R-B52DZ/R-B55DZ - 30-...
  • Page 31 7-4-2 REPLACEMENT PARTS LIST - 31-...
  • Page 32 7-4-3 PWB ASS'Y, DISPLAY AND PARTS LIST P/No Description Spec Maker Bigo 6870JB2061A PWB(PCB),DISPLAY R-B29 (HM-PJT) DOO SAN 6600JB8005A SWITCH KPT-1105A KYUNG IN SW101 0DL500329AA SV50-R032BF569GG SEOUL SEMI. L101~L103 0DD414809AA DIODE, SWITCHING 1N4148 26MM LEAD WIRE UL1007 AWG24 (VSF 0.18/12/0.3MM LEAD WIRE UL1007 AWG24 (VSF 0.18/12/0.3MM LEAD WIRE...
  • Page 33 7-5 PWB DIAGRAM - 33-...
  • Page 34 - 34-...

  • Page 35: Exploded View

    301A 103A 281A 281B 103B 401A 418A 501F 411A 501A 125L 282B 410G 406B 120A 501K 105A 318A 317A 158C 314A 310A 327A 409B 283B 309A 308A 106A 307A 604E 312A 604F 106B 319A 407A 315A...
  • Page 36 405C 405A 330B 332A 404A 329A 110B 125A 131A 149A 149B 140A 149C 154A 151A...
  • Page 37 200A 203A 201A 109C 109B 109B 205A 210A 235A 230A 233A 231A 241B 281D 241D 243A...

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Gn-u292s

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