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LG MH6848G Service Manual

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삼
흥
정
판

MICROWAVE OVEN

SERVICE MANUAL
MODEL: MH6848G
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL30190716
Internal Use Only
Website: http://biz.lgservice.com
March, 2010
Printed in Korea

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Summary of Contents for LG MH6848G

  • Page 1: Microwave Oven

    삼 흥 정 판 Internal Use Only Website: http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MH6848G CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. March, 2010 P/NO : MFL30190716 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

    Glass turntable Roller rest Grill rack 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

    THE OVEN IS TO BE SERVICED ONLY • NEVER put anything into the latch hole and the BY PROPERLY QUALIFIED SERVICE interlock switches area. PERSONNEL. 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/QUICK 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

    11. QUICK WEIGHT DEFROST Desired Desired Start power level cooking time Stop/Clear Quick Defrost Weight (kg) Start Grill Desired or Combi cooking time 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

    POWER LEVEL. (refer to page 1-1) 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

    2) Disconnect the leadwire from magnetron, high voltage transformer, and capacitor. 3) Remove the screw holding the high voltage transformer to the baseplate. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 To prevent microwave leakage, tighten the mounting screws properly, making sure 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 2) MOUNTING OF THE PRIMARY/MONITOR/ MAGNETRON SECONDARY SWITCHES TO THE LATCH BOARD H.V. TRANSFORMER H.V. DIODE H.V. CAPACITOR PRIMARY CIRCUIT PROTECTOR FIG. 1 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

    • 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 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 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

    2. Use plastic wrap or lid. characteristics. 3. Stir once or twice while cooking soup, cocoa or milk, etc. 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. Defective power Replace power Check continuity No continuity. supply cord. supply cord. of power supply 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 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: MAY000 MFL552 -6-1-...
  • Page 29 #EV# DOOR PARTS 13581A 13536A 13552A 13213A 14890A 13720D 14026A 14970A -6-2-...
  • Page 30 #EV# CONTROL PANEL PARTS 24781M 23790D 23572A 268711 WTP018 23506A 24510L 24970A 250201 -6-3-...
  • Page 31 #EV# OVEN CAVITY PARTS WNH001 Button Head (Torx style 2) WSZ185 33808A 33112U 44360A 34810H 34810H WTT010 33052M 35026G 33390G 368771 35889A 35300A 36549S WTP013 -6-4-...
  • Page 32 #EV# LATCH BOARD PARTS 43500A 43501A 466001 466003 466001 WSZ085 -6-5-...
  • Page 33 #EV# INTERIOR PARTS WSZ062 568771 56411A 56930G 56930V 50FZZA 56201A WTT028 56549F 54974S WSZ002 WTT037 WSZ002 55900A 34930W WSZ002 56324A 50CZZH 56851D WSZ002 WSZ002 56912B 56901A 948501 54810C WTT028 55262A -6-6-...
  • Page 34 #EV# BASE PLATE PARTS 56170D 63303A 63302A 65006B WSZ002 WTT021 -6-7-...

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