1. Manuals
  2. Brands
  3. LG Manuals
  4. Microwave Oven
  5. MC-3089NBC
  6. Service manual

LG MC-3089NBC Service Manual

Lg mc-3089nbc microwave oven service manual
Hide thumbs
Table of Contents

Advertisement

Quick Links

Internal Use Only
Website http://biz.lgservice.com

MICROWAVE OVEN

SERVICE MANUAL
MODEL: MC-3089NBC
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
March, 2008
P/NO : MFL34215509
Printed in Korea

Advertisement

Table of Contents
loading

Related Manuals for LG MC-3089NBC

Summary of Contents for LG MC-3089NBC

  • Page 1: Microwave Oven

    Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MC-3089NBC CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. March, 2008 P/NO : MFL34215509 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

    Steam water bowl(Small crisping tray), Large crisping tray 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. START/QUICK START: To quickly set the cooking time directly. 11. STOP/CLEAR: Used to stop oven and 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

    Desired Press Dial Start Warming time Stop/Clear Start 14. MORE AND LESS Desired Dial Stop/Clear Auto Cook (Turn right and left) 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

    G -Y microwave oven as POWER LEVEL. (refer to page 1-1) HEATER • One complete cycle of relay 2 is 22 seconds. 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

    CAUTION: DISCHARGE THE HIGH VOLTAGE control panel. CAPACITOR BEFORE SERVICING (refer to page 2-1) 3) Take off the PCB SUB ASS’Y from the control panel. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 14 Magnetron Lamp Air Duct Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Diode Removal

    3) Remove the screw holding the high voltage transformer to the baseplate. Noise Filter Suction Guide Taptite Screw H.V. Capacitor H.V. Transformer Wire Leads Turntable Motor LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 16 • Tighten the mounting screw. ADJUSTMENT DIRECTION PRIMARY INTERLOCK SWITCH INTERLOCK MONITOR SWITCH SECONDARY INTERLOCK SWITCH 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. Measure the continuity (Reverse). Normal: Infinite. (Ohm-meter scale: Rx10000) Abnormal: Continuity. 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.60°C Approx.60°C MAGNETRON THERMOSTAT 0°C~Approx.145°C Approx.145°C Copyright © 2007 LG Electronics. Inc. All right reserved. 5-10 LGE Internal Use Only Only for training and service purposes...
  • Page 21 Normal: Approx. 10~20 kohm TURNTABLE Measure the resistance. Abnormal: Infinite or several MOTOR (Ohm-meter scale:R x 1000) ohm. (Wire leads removed) LGE Internal Use Only 5-11 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 22 MAKE SURE THE WIRE LEADS ARE CORRECT POSITION. WHEN REMOVING THE WIRE LEAD FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-12 LGE Internal Use Only Only for training and service purposes...

  • Page 23: Trouble Shooting (Display Shows Error Mode)

    2. Use plastic wrap or lid. characteristics. 3. Stir once or twice while cooking soup, cocoa or milk, etc. LGE Internal Use Only 5-13 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 24 3. Random programming when touching other pads. 4. Display is fixed at some figure and can not accept any input. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-14 LGE Internal Use Only Only for training and service purposes...
  • Page 25 Continuity. Check continuity No continuity. Defective power Replace power of power supply supply cord. supply cord. cord. LGE Internal Use Only 5-15 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26 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. 5-16 LGE Internal Use Only Only for training and service purposes...
  • Page 27 Check H.V. Defective high Replace high Abnormal diode. voltage Diode. voltage Diode. normal Check Defective Replace Abnormal Magnetron. magnetron. magnetron. LGE Internal Use Only 5-17 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 28 * When removing the wire leads from 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. 5-18 LGE Internal Use Only...
  • Page 29 Normal. Defective heater Replace the Check the heater Abnormal. (Heater opened) heater Defective Replace the Normal. P.C.B. Assembly P.C.B. Assembly LGE Internal Use Only 5-19 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 30: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION MODEL: MC-3089NBC******* OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS -6-1-...

  • Page 31: Door Parts

    #EV# DOOR PARTS 13581A 15006A 13552A 13213A 13551A WTP013 14026A WTT033 WWS016 14970A 13806A 13650A -6-2-...

  • Page 32: Control Panel Parts

    #EV# CONTROL PANEL PARTS 268711 24781S 23550D 268712 23572A 23550F 250201 WTP018 WTP004 249401 250202 243501 -6-3-...

  • Page 33: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS 35264A WTT021 948501 WSZ060 948502 WTT021 56930V 348101 WNZ015 35300A 34930W 348102 WNH001 WNH001 33112U 33052M WTT047 33651A 33550S 35026S WSZ184 33390C 36549S WTP013 44360A 33390M 35026G 33390G 34370T 35889A -6-4-...

  • Page 34: Latch Board Parts

    #EV# LATCH BOARD PARTS WSZ085 43501A 466001 466003 43500A 44510A 466001 -6-5-...

  • Page 35: Interior Parts

    #EV# INTERIOR PARTS WSZ062 56411A 568771 WTT021 Button Head (Torx style 2) WSZ185 56322A 50FZZA 54620A 56201A WTT028 568772 55900A 54974S WTT021 WTT034 56549F 50CZZH 56912B WSZ002 56851C WSZ002 56324A 54810C WTT028 WSZ002 WTT021 55262A 535042 36549C 55238A 56208A 535041 WNZ015 WTT021 WTT021...

  • Page 36: Base Plate Parts

    #EV# BASE PLATE PARTS 56170D 63302A 63303A WTT028 647781 WTT021 WTT030 WSZ002 -6-7-...

Table of Contents