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LG MH-2381NBR Service Manual
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LG MH-2381NBR Service Manual

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Download this manual See also: Owner's Manual
삼
흥
정
판

MICROWAVE OVEN

SERVICE MANUAL
MODEL: MH-2381NBR
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL32514623
Internal Use Only
Website: http://biz.lgservice.com
February, 2009
Printed in Korea

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Summary of Contents for LG MH-2381NBR

  • Page 1: Microwave Oven

    삼 흥 정 판 Internal Use Only Website: http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MH-2381NBR CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. February, 2009 P/NO : MFL32514623 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

    Low rack Crispy tray Scrubber 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

    11. QUICK START: To quickly set the cooking time directly. 12. CLEAR: Used to 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

    4. QUICK START Clear Quick start 5. MICROWAVE COOKING Clear Power Time Quick Start 6. GRILL COOKING Clear Grill Time Quick Start 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

    • The micom controller controls the ON-OFF time of relay plate. 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 Taptite Screw Waveguide 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 NOTE: Make sure heater is fully cooled when tested. GRILL THERMOSTAT 0°C~Approx.90°C Approx.90°C OVEN THERMOSTAT MAGNETRON 0°C~Approx.145°C Approx.145°C THERMOSTAT 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 IExcessive 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 Abnormal. output. magnetron. magnetron. NOTE: Simple test of power output-conducted by heating one liter water for one min. if available. LGE Internal Use Only 5-15 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26 Check H.V. Defective high Replace high Abnormal diode. voltage Diode. voltage Diode. normal Check Defective Replace Abnormal Magnetron. magnetron. magnetron . Copyright © 2007 LG Electronics. Inc. All right reserved. 5-16 LGE Internal Use Only Only for training and service purposes...
  • Page 27 * When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition. 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: -6-1-...

  • Page 29: Door Parts

    #EV# DOOR PARTS 13581A 13536A 13552A 13213A 13720D 14890A 14026A WTT028 14970A 13650A -6-2-...

  • Page 30: Control Panel Parts

    #EV# CONTROL PANEL PARTS WTP013 268712 268711 23572A 25020M 23806C 249401 WTP004 243501 25020S 24781S -6-3-...

  • Page 31: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS WNH001 WTT021 34810H 44360A 34810H WTT011 33052M 33112U 35026G 35026C 368771 33390G 36549S 35300A 34370T WTP013 35889A 33390M 95001B -6-4-...
  • Page 32 #EV# LATCH BOARD PARTS WSZ085 466001 43500A 43501A 466003 44510A 466001 -6-5-...
  • Page 33 #EV# INTERIOR PARTS 568771 WSZ062 56411A 56930V 50FZZA 56201A WTT028 56549F 54974S WSZ002 55900A WTT037 WSZ002 50CZZH WTP004 56930G 56851D 56912B WSZ002 948501 55262A 54810C WTT028 56324A WSZ002 -6-6-...
  • Page 34 #EV# BASE PLATE PARTS 56170D 63302A 63303A 65006B WSZ002 WTT021 -6-7-...

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