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MICROWAVE OVEN
SERVICE MANUAL
MODEL : MB-390A
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG MB-390A

  • Page 1 MICROWAVE OVEN SERVICE MANUAL MODEL : MB-390A CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
  • Page 2: Specifications

    SPECIFICATIONS ITEM DESCRIPTION MODEL MB-390A Power Requirement 230 Volts AC 50 Hz Single phase, 3 wire grounded Microwave 1,200W Grill 1,100W Power Output 800 Watts full microwave power (IEC705) Microwave Frequency 2,450 MHz Magnetron 2M214 - 39F, 2M218J, 2M254J Timer 60 Min.
  • Page 3: Control Panel

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Safety Door Lock System Turntable Grill Rack Rotating Ring CONTROL PANEL Watt Defrost 1. POWER CONTROL KNOB: Used in selected the desired power level for cooking. 2.
  • Page 4: Operating Sequence

    OPERATING SEQUENCE GRILL COOKING MICROWAVE COOKING 1. Open the oven door, place the food on the rack in 1. Open the oven door, place the food on the the oven, and close the oven door. turntable in the oven, and close the oven door. 2.
  • Page 5: Schematic Diagram

    SCHEMATIC DIAGRAM...
  • Page 6: Circuit Description

    CIRCUIT DESCRIPTION • As the door is closed, the contact of MONITOR WHEN THE DOOR IS OPENED DURING SWITCH opens. This switch creates the short circuit to COOKING blow fuse during operation under abnormal condition. • Both primary switch and secondary switch open to cut (ie, should the contacts of primary and secondary off the primary winding voltage to the high voltage switch fail to open the circuit)
  • Page 7 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 8: 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 9: Exploded View

    EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 10: Door Parts

    DOOR PARTS 13581A 15006A 13536A 13552A 13213A 13720D 13352A 14026A 14970A...
  • Page 11: Control Panel Parts

    CONTROL PANEL PARTS 23572A 249402 26549T WTP015 249401 969201 24781T...
  • Page 12: Oven Cavity Parts

    OVEN CAVITY PARTS WTT021 33112U WTT021 35264A 33550H WNZ015 33052M 340511 35026G 33390G 35300S 34960A 35889A 34036W 36549S WTP013...
  • Page 13: Latch Board Parts

    LATCH BOARD PARTS WSZ085 466001 43501A 43500A 466003 44510A 466002...
  • Page 14: Interior Parts

    INTERIOR PARTS 568771 WSZ062 56411A 56930V 56930G 50FZZA WTT028 56201A 56549F 54974S WSZ002 55900A WTT037 56851D 56912B WSZ002 50CZZH 56851C 55262A WTT028 54810C 56324A WSZ002 56201B...
  • Page 15: Base Plate Parts

    BASE PLATE PARTS 56170D 63302A 63303A WTT021 65006B WSZ002...

Table of Contents