LG MG5887U Service Manual

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삼

흥

정

판

MICROWAVE OVEN

SERVICE MANUAL

MODEL: MG5887U

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL41243605

MG5887KIT

Internal Use Only

Website http://biz.lgservice.com

December, 2008

Printed in Korea

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Summary of Contents for LG MG5887U

Page 1 삼 흥 정 판 Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MG5887U MG5887KIT CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. December, 2008 P/NO : MFL41243605 Printed in Korea...
Page 2 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 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 Rotating ring High rack Low 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 • 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 7 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 Time start 6. COMBINATION COOKING Quick Clear Combi Time start 7. AUTO WEIGHT DEFROST Quick Clear Auto Defrost Weight (kg) start Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 11 • The micom controller controls the ON-OFF time of relay plate. 2 by the applied signal to vary the average output LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 12 4 mW/cm . Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 13 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. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 14 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) Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 15 4) Remove the screw holding the high voltage capacitor bracket. Fan Motor ASS Y Suction Guide Remove door assembly H.V. Capacitor H.V. H.V. Transformer Diode Air Duct LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 16 Magnetron Taptite Screw Air Duct Magnetron Magnetron Gasket Waveguide Bracket Dome Waveguide Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 17 FIG. 1 CAUTION: CHECK THE CORRECT POSITION MAGNETRON H.V. TRANSFORMER H.V.FUSE H.V. DIODE H.V. CAPACITOR PRIMARY LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 18 Primary Switch Monitor Switch Secondary Switch NOTE : After checking for the continuity of switches, make sure that are connected correctly. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 19 Normal: Less than 1 ohm • Filament terminal 2. Measure the resistance. (Ohm-meter scale: Rx1000) Normal: Infinite • Filament to chassis LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 20 Some inexpensive meters may indicate infinite resistance in both direction. Measure the continuity (Reverse). Normal: Infinite. (Ohm-meter scale: Rx10000) Abnormal: Continuity. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 21 0°C~Approx.145°C Approx.145°C MAGNETRON THERMOSTAT Cooking Start Check for P.C.B. connector. Disconnect the 8 pin connector from P.C.B. (Refer to schemetic diagram) LGE Internal Use Only 5-10 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 22 • 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. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-11 LGE Internal Use Only...
Page 23 Turntable drags or makes Distribute food evenly. Cook Excessive weight on tray or noise. smaller portions and,or use improperly balanced. lighter weight cookware. LGE Internal Use Only 5-12 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 24 4. Random programming when touching other pads. 5. Display is fixed at some figure and can not accept any input. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-13 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 5-14 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. 5-15 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 5-16 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 28 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Output is full when Defective P.C.B. Replace P.C.B. Disconnect the Abnormal. you set lower assembly. assembly. wire leads from power level.
Page 29 #EV# EXPLODED VIEW INTRODUCTION MODEL: -6-1-...
Page 30 #EV# DOOR PARTS 13581A 13536A 13552A 13213A 14890A 13551A 14026A 14970A -6-2-...
Page 31 #EV# CONTROL PANEL PARTS 24781S 268712 268711 23790D 23551A WTP013 25020M 249401 WTP004 25020S 24510L 24970A 23551B -6-3-...
Page 32 #EV# OVEN CAVITY PARTS (II) For Model: WNH001 Button Head (Torx style 2) 34810H WSZ185 34810H WTT021 33112U 33808A 44360A 33052M 35026C 35026G 368771 33390G 35300A 34370T 36549S 35889A WTP013 -6-5-...
Page 33 #EV# LATCH BOARD PARTS 43500A 43501A WSZ085 466001 466003 466001 -6-6-...
Page 34 #EV# INTERIOR PARTS WSZ062 56411A WSZ002 56930V 34930W WSZ002 56930G WSZ002 50FZZA 56324A 56201A WTT037 WTT028 56549F 55900A 54974S WSZ002 50CZZH 56851D 56912B 54810C WTT028 56901A 948501 568771 55262A -6-7-...
Page 35 #EV# BASE PLATE PARTS 56170D 63303A 63302A WTT021 65006B WSZ002 -6-8-...

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