LG MS-1904H Service Manual
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LG MS-1904H Service Manual

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MICROWAVE OVEN
SERVICE MANUAL
MODEL: MS-1904H
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG MS-1904H

  • Page 1 MICROWAVE OVEN SERVICE MANUAL MODEL: MS-1904H CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...

  • Page 3: Table Of Contents

    CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...

  • Page 4: Specifications

    SPECIFICATIONS ITEM DESCRIPTION MS-1904H MODEL 230 Volts AC 60 Hz Power Requirement 1,000 Watts Single phase, 3 wire grounded Power Output 700 Watts full microwave power (IEC705) 2,450 MHz Microwave Frequency Magnetron 2M218J 0 ~ 99 min. 50 sec. Timer...

  • Page 5: Cautions

    CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.

  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Door Open Button Safety Door Lock System Turntable Rotating Ring CONTROL PANEL 1. DISPLAY WINDOW. 2. AUTO COOK: Used to cook the foods listed by one touch. 3.

  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions 4. AUTO WEIGHT DEFROST COOKING during oven operation. Desired Desired Stop defrost cooking Start 1. MICROWAVE COOKING category weight Desired Desired Stop Start power level cooking time 5. AUTO COOK 2.

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION • A high voltage of approximately 2100 volts AC is GENERAL DETAILS generated in the secondary of the high voltage • The low voltage transformer supplies the necessary transformer which is increased by the action of the high voltage to the micom controller when power cord is voltage diode and charging of the high voltage plugged in.

  • Page 11: Exploded View

    EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 12 DOOR PARTS 13581A 13552A 13536A 13213A 13352A 13720D 14026A 14970A...
  • Page 13 CONTROL PANEL PARTS FOR MS-198H 24781M 268711 WTT028 23572A WTP004 WTP018 26638A 24510L 24970A 250201...
  • Page 14 CONTROL PANEL PARTS FOR MS-199H 24781M 268711 WTT028 23572A WTP018 WTP004 26638A 249401 24510L 24970A 250201...
  • Page 15 OVEN CAVITY PARTS WTT021 33112U 33052M 340511 33390G 34960A 35889A 36549S WTP013...
  • Page 16 LATCH BOARD PARTS 56912B 55262A 435001 466001 466003 WTT028 466001 WSZ085...
  • Page 17 INTERIOR PARTS WSZ002 568771 56411A 56930V 50FZZA WTT028 56201A 56549F 54974S 55900A WTT037 56324A WSZ002 56201B...
  • Page 18 BASE PLATE PARTS 56901A 56170D WSZ002 63302A 54810C 50CZZH 63303A 56851D WTT021 65006B WSZ002 65006B...

  • Page 19: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B...

  • Page 20: Printed Circuit Board

    PRINTED CIRCUIT BOARD...

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