LG MJ3284UAB Service Manual
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LG MJ3284UAB Service Manual

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Internal Use Only
Website http://biz.lgservice.com
MICROWAVE OVEN
SERVICE MANUAL
MODEL: MJ3284UAB
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
August, 2015
P/NO : MFL32190946
Printed in Korea

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Summary of Contents for LG MJ3284UAB

  • Page 1 Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MJ3284UAB CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. August, 2015 P/NO : MFL32190946 Printed in Korea...

  • Page 2: Safety Precautions

    CAUTION MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Table Of Contents

    EXPLODED VIEW - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-1 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 4: Specifications

    Rotating ring High rack, Low rack This microwave oven is designed for household use only. It is not recommended for commercial purposes. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 5: Cautions

    • NEVER put iron tools on the magnetron. BY PROPERLY QUALIFIED SERVICE • NEVER put anything into the latch hole and the PERSONNEL. interlock switches area. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 6: Installations

    L or colored red. 10cm Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Operating Instructions

    12. START/Q-START : To quickly set the cooking time directly. 13. STOP/CLEAR : Used to stop oven and clear all entries except time of day. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Operating Sequence

    Start Cook DIAL Start Cook Clear 13. CONVECTION MORE / LESS Stop/Clear Convection DIAL Start Stop/Clear Cooking MORE Stop/Clear Cooking LESS Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 10: Circuit Description

    G -Y microwave oven as POWER LEVEL. (refer to page 1-1) HEATER • One complete cycle of relay 2 is 22 seconds. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Service Information

    4 mW/cm . Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 12 5 mW/cm.sq. Leakage for a fully assembled oven (Before the latch switch (primary) is interrupted) with the door in a slightly opened position-less than 2 mW/cm.sq. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Measurement Of Microwave Power Output

    CAUTION: DISCHARGE THE HIGH VOLTAGE control panel. CAPACITOR BEFORE SERVICING (refer to page 2-1) 3) Take off the PCB SUB ASS’Y from the control panel. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 14 To prevent microwave leakage, tighten the mounting screws properly, making sure there is no gap between the waveguide and the magnetron. Magnetron Air Duct Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 3) Remove the screw holding the high voltage transformer to the baseplate. Suction Guide H.V. Transformer H.V. Capacitor Taptite Screw Wire Leads Turntable Motor LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 • Tighten the mounting screw. ADJUSTMENT DIRECTION PRIMARY INTERLOCK SWITCH INTERLOCK MONITOR SWITCH SECONDARY INTERLOCK SWITCH Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Interlock Continuity Test

    Primary Switch Monitor Switch Secondary Switch NOTE : After checking for the continuity of switches, make sure that are correctly connected. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 18: Component Test Procedure

    Normal: Less than 1 ohm • Filament terminal 2. Measure the resistance. (Ohm-meter scale: Rx1000) Normal: Infinite • Filament to chassis Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 Some inexpensive meters may indicate infinite resistance in both direction. Measure the continuity (Reverse). Normal: Infinite. (Ohm-meter scale: Rx10000) Abnormal: Continuity. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 20 Normal: more than 0.5 Mohm NOTE: Make sure heater is fully cooled when tested. 0°C~Approx.60°C Approx.60°C MAGNETRON THERMOSTAT 0°C~Approx.145°C Approx.145°C 5-10 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Measure the resistance. Normal: Approx. 10~20 kohm TURNTABLE Abnormal: Infinite or several (Ohm-meter scale:R x 1000) MOTOR ohm. (Wire leads removed) 5-11 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 22 MAKE SURE THE WIRE LEADS ARE CORRECT POSITION. WHEN REMOVING THE WIRE LEAD FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES. 5-12 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Trouble Shooting (Display Shows Error Mode)

    2. Use plastic wrap or lid. characteristics. 3. Stir once or twice while cooking soup, cocoa or milk, etc. 5-13 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 24 3. Random programming when touching other pads. 4. Display is fixed at some figure and can not accept any input. 5-14 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 Continuity. Check continuity No continuity. Defective power Replace power of power supply supply cord. supply cord. cord. 5-15 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26 NOTE: Simple test of power output-conducted by heating one liter water for one min. if available. Minimum 8.5 ˚ C temperature rise is normal condition. 5-16 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Check H.V. Defective high Replace high Abnormal diode. voltage Diode. voltage Diode. normal Check Defective Replace Abnormal Magnetron. magnetron. magnetron. 5-17 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 28 * When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition. 5-18 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 Normal. Defective heater Replace the Check the heater Abnormal. (Heater opened) heater Defective Replace the Normal. P.C.B. Assembly P.C.B. Assembly 5-19 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 30: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION MODEL: Customer Model Product Code SVC Model OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS -6-1-...
  • Page 31 #EV# DOOR PARTS 13581A 13552A 13213A 13551C 14026A 14970A 13650A -6-2-...
  • Page 32 #EV# CONTROL PANEL PARTS 26871M 24781S 26871T 24781A 250202 249401 24941A 250201 -6-3-...
  • Page 33 #EV# OVEN CAVITY PARTS 55238U W101 W101 55238L 348102 W178 330522 348101 353001 33112U 348103 353002 348103 348101 33390G 44360A 35026G 34370T 330521 35889A 35026C 36549S -6-4-...
  • Page 34 #EV# LATCH BOARD PARTS W102 43501A 466001 466003 43500A 44510A 466001 -6-5-...
  • Page 35 #EV# INTERIOR PARTS 33809A 568772 568773 W103 568771 W140 54810S W177 535041 W129 56411A 535042 55900N 36549C 56930V 56930G W124 54350S W125 56322A 55900C 55300A W141 W102 50FZZA 56201A 54810V 56549F 54974S 55900A 56912B 34930W 50CZZH 56930M W101 W101 54810C 56851D 56901A 56324A...
  • Page 36 #EV# BASE PLATE PARTS 56170D 63303A 63302A 647781 W101 -6-7-...

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