LG MS1949G Service Manual
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LG MS1949G Service Manual

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See also: Owner's Manual & Cooking Guide
삼
흥
정
판

MICROWAVE OVEN

SERVICE MANUAL
MODEL: MS1949G
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL31039015
Internal Use Only
Website http://biz.lgservice.com
March, 2009
Printed in Korea

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Summary of Contents for LG MS1949G

  • Page 1: Microwave Oven

    삼 흥 정 판 Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MS1949G CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. March, 2009 P/NO : MFL31039015 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

    REPLACEMENT PARTS LIST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-1 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 4: Specifications

    Owner's manual Glass turntable Roller rest 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

    10. STOP/CLEAR: Used to stop oven and clear all entries except time of day. 11. START/Q-START: To quickly set the cooking time directly. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Operating Sequence

    Desired Food Stop/Clear quick defrost Start weight category 8. ADD MINUTE Desired Food Stop/Clear add minute Start weight category 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

    EXCEPT MAXIMUM. • The micom controller controls the ON-OFF time of relay 2 by the applied signal to vary the average output 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

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

  • Page 14: Diode Removal

    4) Remove the screw holding the high voltage capacitor bracket. Fan Motor ASSʼY Suction Guide Remove door assembly H.V. Transformer Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Taptite Screw Magnetron Magnetron Magnetron Gasket Waveguide Bracket Dome Waveguid LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 CAUTION: CHECK THE CORRECT POSITION FIG. 1 MAGNETRON H.V. TRANSFORMER PROTECTOR DIODE H.V. DIODE H.V. CAPACITOR PRIMARY 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: Test Procedure

    Some inexpensive meters may indicate infinite resistance in both direction. Normal: Continuity. Measure the continuity (Reverse). Abnormal: ∞ (Ohm-meter scale: Rx10000) LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 20 (Wire leads removed.) Note: Relay Relay 1 Relay 1: Fan motor Turntable motor Oven lamp Relay 2: Microwave Relay 2 Copyright © 2007 LG Electronics. Inc. All right reserved. 5-10 LGE Internal Use Only Only for training and service purposes...
  • Page 21 • 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. LGE Internal Use Only 5-11 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 22: Trouble Shooting

    Turntable drags or makes Distribute food evenly. Cook Excessive weight on tray or noise. smaller portions and,or use improperly balanced. lighter weight cookware. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-12 LGE Internal Use Only Only for training and service purposes...
  • Page 23 4. Random programming when touching other pads. 5. Display is fixed at some figure and can not accept any input. LGE Internal Use Only 5-13 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 24 Continuity. Check continuity No continuity. Defective power Replace power of power supply supply cord. supply cord. cord. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-14 LGE Internal Use Only Only for training and service purposes...
  • Page 25 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. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. 5-15 Only for training and service purposes...
  • Page 26 Check Defective Replace Abnormal Magnetron. magnetron. magnetron . normal Check Defective Replace Abnormal Protector Diode. Protector Diode. Protector Diode . Copyright © 2007 LG Electronics. Inc. All right reserved. 5-16 LGE Internal Use Only Only for training and service purposes...
  • Page 27 2 and check continuity relay 2. (Operate the unit) LGE Internal Use Only 5-17 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 28: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION MODEL: OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS -6-1-...

  • Page 29: Door Parts

    #EV# DOOR PARTS 13581A 13552A 13536A 13213A 14890A 13720D 14026A 14970A -6-2-...

  • Page 30: Control Panel Parts

    #EV# CONTROL PANEL PARTS 24781M 268711 23572A 23506A WTT028 24510L 24970A 250201 -6-3-...

  • Page 31: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS 33112U WTT021 33052A 33390G 35889A 36549S WTP013 -6-4-...
  • Page 32 #EV# LATCH BOARD PARTS 56912B WSZ085 43501A 55262A 466001 466003 466001 43500A -6-5-...
  • Page 33 #EV# INTERIOR PARTS WSZ062 568771 56411A 56930V WSZ002 50FZZA 56201A WTT028 56549F WTT037 55900A 54974S WSZ002 56851D 55238A WSZ002 50CZZH 56324A 56901A WTT028 54810C WSZ002 -6-6-...
  • Page 34 #EV# BASE PLATE PARTS 56170D 63302A 63303A WTT021 65006B WSZ002 65006B -6-7-...

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