LG MJ3294BDB Service Manual
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LG MJ3294BDB Service Manual

LG MJ3294BDB Service Manual

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Internal Use Only
Website: http://biz.lgservice.com
MICROWAVE OVEN
SERVICE MANUAL
MODEL: MJ3294BDB
MJ3294BDW
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
June, 2015
P/No.: MFL34869163
Printed in Korea

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Summary of Contents for LG MJ3294BDB

  • Page 1 Internal Use Only Website: http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MJ3294BDB MJ3294BDW CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. June, 2015 P/No.: MFL34869163 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 © 2009 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 © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 4: Specifications

    High rack, Low rack Crispy Tray This microwave oven is designed for household use only. It is not recommended for commercial purposes. Copyright © 2009 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. • NEVER put anything into the latch hole and the PERSONNEL. interlock switches area. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 6: Installations

    L or colored red. 10cm Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Operating Instructions

    • The quick start feature allows you to set 30 seconds intervals of HIGH power cooking with a touch of the quick start button. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Operating Sequence

    12. MORE AND LESS 6. QUICK START START/ STOP/ Desired COOK START/ STOP/ COOK CLEAR cook MODE QUICK START CLEAR MODE QUICK START Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Composition Of Control

    COMPOSITION OF CONTROL P/N : EBR73081807 (Main PCB) EAX64105602 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 10 COMPOSITION OF CONTROL P/N : EBR79290901 (Key PCB) EAX66088301 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Schematic Diagram

    SCHEMATIC DIAGRAM LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 12: Circuit Description

    POWER LEVEL. (refer to page 1-1) • One complete cycle of relay 2 is 22 seconds. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Service Information

    4 mW/cm . Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 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. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 15: Measurement Of Microwave Power Output

    2) Disconnect two terminals, and remove one screw of the earth terminal. CAUTION: DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING (refer to page 2-1) Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 2) Disconnect the leadwire from magnetron, high voltage transformer, and capacitor. 3) Remove the screw holding the high voltage Magnetron transformer to the baseplate. Air Duct LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 17 2. Be sure to grasp the connector, not the wires, when removing. Suction Guide H.V. Transformer H.V. Capacitor Taptite Screw Wire Leads Turntable Motor Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 • Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed. • Tighten the mounting screw. LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 19: Interlock Continuity Test

    Primary Switch Monitor Switch Secondary Switch NOTE : After checking for the continuity of switches, make sure that are correctly connected. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Component Test Procedure

    Normal: Less than 1 ohm • Filament terminal 2. Measure the resistance. (Ohm-meter scale: Rx1000) Normal: Infinite • Filament to chassis LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 21 Some inexpensive meters may indicate infinite resistance in both direction. Normal: Infinite. Measure the continuity (Reverse). (Ohm-meter scale: Rx10000) Abnormal: Continuity. Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 Normal: more than 0.5 Mohm NOTE: Make sure heater is fully cooled when tested. 0°C~Approx.145°C Over 145°C OVEN THERMOSTAT MAGNETRON THERMOSTAT 5-10 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 23 • MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION. • WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES. 5-11 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 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 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 25: Basic Check Summary

    Symptom : no heat -. Check: 1. MGT relay(RY2), Convection relay(RY5) and Triac 2. Primary switch 3. MGT , HVT, Heater and Thermistor 5-13 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Trouble Shooting

    2. Use plastic wrap or lid. characteristics. 3. Stir once or twice while cooking soup, cocoa or milk, etc. 5-14 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 27 1. Check connector electric wiring No Power 2. Between the power code and connector 3. Between the ends of thermostat (OVEN, MGT) Abnormal Normal 5-15 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 Continuity test between the Power code and connector? (EBR73081807) Code “L” to Pin3 Code “N” to Pin1 Convection Heater Thermostat 5-16 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 29 Ends of noise filter? Connector . Neutral Terminal of Live Terminal of Noise filter Noise filter Replace the Main PCB (EBR73081807) 5-17 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 Key PCB Failure 2.Check the Connection between Key PCB and Main PCB ~ CN Resistance[ ] Door Closed Short Door Opened 5-18 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 31 CON1 of Key PCB ) Replace the Main PCB. (EBR73081807) Replace the Key PCB if Changing the Main PCB Doesn’t resolve the problem 5-19 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 2. Check the primary switch 3. Check the MGT, HVT, Heater and Thermistor Conv Relay (Convection) RY2 (MGT) TRIAC MGT Relay 5-20 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 33 High voltage Transformer Repair the 2. Secondary : 180 Ohm Assembly disconnected or connector Disassembled? 3. Filament winding : 1 Ohm 5-21 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 Is the connector connected Reconnect or To the high voltage diode repair the Assembly disconnected or connector. . Disassembled? 5-22 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 35 Is there any beep sound in Reconnect or continuity test between Repair the the ends of Turntable Motor? connector Test Point 10~20kohm 5-23 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 (Door should be closed.) Power ON Replace the When door is closed, does Turntable Motor The oven lamp turn on? 5-24 LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 37: 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 38 #EV# DOOR PARTS 13581A 13552A 13213A 14510L W316 14810C 13551C 14810L 13651A W319 14510L W319 14810R W316 -6-2-...
  • Page 39 #EV# CONTROL PANEL PARTS 24781S 26871M 23572A 23550D 26871R 23806C -6-3-...
  • Page 40 #EV# OVEN CAVITY PARTS 55238U W101 W101 55238L 348102 353001 W178 330522 348101 33112U 348103 353002 348103 348101 33390G 33390A 44360A 34370T 330521 35026G 35889A 35026C 36549S -6-4-...
  • Page 41 #EV# LATCH BOARD PARTS W102 W102 445102 44970A 44980A 43501A 44970A 466001 466001 445101 466003 43500A -6-5-...
  • Page 42 #EV# INTERIOR PARTS 33809A 568772 568773 W103 568771 W140 54810S W177 535041 W124 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 43 #EV# BASE PLATE PARTS 56170D 63303A 63302A 647781 W101 64970A 648111 64970A 648112 -6-7-...

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