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LG MS2548GR Service Manual

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See also: Owner's Manual & Cooking Guide
Internal Use Only
Website http://biz.lgservice.com

MICROWAVE OVEN

SERVICE MANUAL
MODEL: MS2548GR
MS2548XR
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
February, 2009
P/NO : MFL31039014
Printed in Korea

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Summary of Contents for LG MS2548GR

  • Page 1: Microwave Oven

    Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MS2548GR MS2548XR CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. February, 2009 P/NO : MFL31039014 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

    Accessories Glass tray 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. 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

    The wire which is colored brown must be connected to the terminal in the plug which is marked with the letter L or colored red. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Operating Instructions

    11. STOP/CLEAR: Used to stop over and clear all entries except time of day. 12. START/Q-START: One tap allows over 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

    5. AUTO DEFROST Auto Weight Stop/Clear Start Defrost (kg) 7. ONE TOUCH AUTO MENU ONE TOUCH Weight Stop/Clear Start AUTO MENU (kg) 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 ASS Y Suction Guide Remove Door Assembly Capacitor Transformer H.V. Diode Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Magnetron Waveguide Taptite Screw Dome Waveguide Bracket Wire Leads Magnetron Gasket Magnetron Turntable Motor LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 FIG. 1 CAUTION: CHECK THE CORRECT POSITION MAGNETRON H.V. TRANSFORMER H.V. DIODE H.V. CAPACITOR PRIMARY CIRCUIT PROTECTOR 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 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

    Normal: Less than 1 Ω (Ohm-meter scale: Rx1) • Filament terminal 2. Measure the resistance. Normal: ∞ (Ohm-meter scale: Rx1000) • 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. Normal: ∞ 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

    Turntable drags or makes Distribute food evenly. Cook IExcessive weight on tray or noise. smaller portions and,or use improperly balanced. lighter weight cookware. 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. Check continuity No continuity. Defective power Replace power of power supply supply cord. supply cord. cord. LGE Internal Use Only 5-13 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 24 Abnormal. output. magnetron. magnetron. NOTE: Simple test of power output-conducted by heating one liter water for one min. if available. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-14 LGE Internal Use Only Only for training and service purposes...
  • Page 25 Check high vol- Defective high Replace high Abnormal tage diode. voltage diode. voltage diode. Normal Check Defective Replace Abnormal magnetron. magnetron. magnetron. LGE Internal Use Only 5-15 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26 • When Removing the wire leads from the parts, be sure to grasp the connector, not the wires. • When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-16 LGE Internal Use Only...

  • Page 27: 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 28 #EV# DOOR PARTS (II) MODEL: 13581A 13536A 13552A 13213A 13551A 14026A 14970A -6-3-...
  • Page 29 #EV# CONTROL PANEL PARTS (II) MODEL: 24781M 23551A 268711 WTP018 24510L 24970A 23551B -6-5-...

  • Page 30: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS 33112U 33052A WTT010 33390G 34370T 36549S 35889A WTP013 -6-6-...

  • Page 31: Latch Board Parts

    #EV# LATCH BOARD PARTS 43500A 466001 43501A 466003 466001 WSZ085 -6-7-...

  • Page 32: Interior Parts

    #EV# INTERIOR PARTS 568771 WSZ062 56411A 50FZZA 56201A WTT028 56549F 54974S WSZ002 55900A WTT037 WSZ002 50CZZH WTP004 56930G 56851C 56912B WEB001 948501 55262A 54810C WTT028 34930W 56324A WSZ002 -6-8-...

  • Page 33: Base Plate Parts

    #EV# BASE PLATE PARTS 56170D 63302A 63303A 647781 WTT030 WSZ002 WTT021 -6-9-...
  • Page 34 -40-...

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