LG MS1440SL Service Manual
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MICROWAVE OVEN
SERVICE MANUAL
MODEL: MS1440SL
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/No.: MFL30097108
MS1440SW
Internal Use Only
Website http://biz.lgservice.com
MS1442W
MS1442S
July, 2010
Printed in Korea

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Summary of Contents for LG MS1440SL

  • Page 1 삼 흥 흥 정 정 판 판 Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MS1440SL MS1442W MS1440SW MS1442S CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. July, 2010 P/No.: MFL30097108 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 Rotating ring 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. • NEVER put anything into the latch hole and the interlock switches area. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 6: Installations

    7. Place the microwave oven as far away as possible from TV, RADIO, COMPUTER, etc., to prevent interference. 10cm ENSURE PROPER GROUND AND FIRM CONNECTION BEFORE USE 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/QUICK START: One tap allows oven to begin functioning. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 8: Operating Sequence

    4. QUICK DEFROST PARAR/BORRAR DESCONGELADO RAPIDO 5. MAXICAN COOKING PARAR/BORRAR COCINA MEXICANA INCIO 6. TIME COOKING PARAR/BORRAR TIEMPO NUMBER POTENCIA NUMBER INICIO Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM Model: MS1440SW /00, MS1440SL /00 Model: MS1442W /00, MS1442S /00, MS1440SL /01 LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 10: Circuit Description

    This 3.3 volts is applied to the magnetron to heat the magnetron filament through two noise-preventing choke coils. 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

    3) Lift up and pull out control panel assembly carefully from the cavity. 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 If the door assembly is not mounted properly, microwaves may leak from the clearance between the door and the oven. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 2. Be sure to grasp the connector, not the wires, when tighten the mounting screws properly, making sure removing. there is no gap between the waveguide and the magnetron. Taptite Screw LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 4) Remove the screw holding the high voltage capacitor bracket and remove the high voltage diode earth screw. ADJUSTMENT DIRECTION PRIMARY SWITCH MONITOR SWITCH SECONDARY SWITCH Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17: Interlock Continuity Test

    Switch Monitor Switch Secondary Switch NOTE : After checking for the continuity of switches, make sure that they are connected correctly. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 18: Component Test Procedure

    • Filament terminal Normal: Less than 1 ohm 2. Measure the resistance. (Ohm-meter scale: Rx1000) • Filament to chassis Normal: Infinite 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. Normal: Infinite. Measure the continuity (Reverse). Abnormal: Continuity. (Ohm-meter scale: Rx10000) LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 20 • 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. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-10 LGE Internal Use Only...
  • Page 21: Trouble Shooting

    Inconsistent intensity of Uneven cooking. 2. Stir once or twice while microwave by their cooking soup, cocoa or characteristics. milk, etc. LGE Internal Use Only 5-11 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 22 4. Random programming when touching other pads. 5. Display is fixed at some figure and can not accept any input. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-12 LGE Internal Use Only Only for training and service purposes...
  • Page 23 Continuity. Defective power Replace power Check continuity No continuity. supply cord. supply cord. of power supply cord. LGE Internal Use Only 5-13 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 24 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. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-14 LGE Internal Use Only Only for training and service purposes...
  • Page 25 2 and check continuity relay 2. (Operate the unit) LGE Internal Use Only 5-15 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION MODEL: Customer Model Product Code SVC Model OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS -6-1-...
  • Page 27 #EV# DOOR PARTS 13581A 13536A 13552A 13213A 13720D 14890A 14026A 14970A -6-2-...
  • Page 28 #EV# CONTROL PANEL PARTS 24781M 268711 23572A 23506A 24510L 24970A 250201 23806B -6-3-...
  • Page 29 #EV# OVEN CAVITY PARTS 33112U 33052A 33390G 36549S 34370T 35889A 35889A -6-4-...
  • Page 30 #EV# LATCH BOARD PARTS WSZ085 43501A 466001 43500A 466003 466001 -6-5-...
  • Page 31 #EV# INTERIOR PARTS 568771 WSZ002 56411A 50 FZZA 56930M 56201A 34930W 56549F 54974S WSZ062 55900A WSZ 002 WSZ002 35012A 50 CZZH 56851D WSZ062 WSZ 002 56324A 56912B WSZ 002 54810C 56901A 54980A 55262A -6-6-...
  • Page 32 #EV# BASE PLATE PARTS 56170D 63303A WSZ002 -6-7-...

This manual is also suitable for:

Ms1440swMs1442wMs1442s

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