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Microwave Oven
MH-6387AR
Service manual
LG MH-6387AR Service Manual
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Owner's manual
(36 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Safety Precautions
Table of Contents
Specifications
Cautions
Installations
Operating Instructions
Features
Control Panel
Operating Sequence
Schematic Diagram
Circuit Description
Service Information
Tools and Measuring Instruments
Microwave Leakage Test
Measurement of Microwave Power Output
Disassembly and Adjustment
Interlock Continuity Test
Component Test Procedure
Trouble Shooting
Exploded View
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삼
흥
정
판
MICROWAVE OVEN
SERVICE MANUAL
MODEL: MH-6387AR
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL32188507
Internal Use Only
Website: http://biz.lgservice.com
August, 2007
Printed in Korea
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Summary of Contents for LG MH-6387AR
Page 1
삼 흥 정 판 Internal Use Only Website: http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MH-6387AR CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. August, 2007 P/NO : MFL32188507 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
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: 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
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: Operating Sequence
4. QUICK START Clear Quick start 5. MICROWAVE COOKING Clear Power Time Quick Start 6. GRILL COOKING Clear Grill Time Quick Start 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
• The micom controller controls the ON-OFF time of relay plate. 2 by the applied signal to vary the average output 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
4) Remove the screw holding the high voltage capacitor bracket. Fan Motor ASS Y Suction Guide Remove Door Assembly Capacitor Transformer H.V. Diode Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 15
Magnetron Taptite Screw Waveguide Dome Waveguide Bracket Wire Leads Magnetron Gasket Magnetron Turntable Motor LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 16
FIG. 1 CAUTION: CHECK THE CORRECT POSITION MAGNETRON H.V. TRANSFORMER H.V. DIODE H.V. CAPACITOR PRIMARY CIRCUIT PROTECTOR 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
Normal: Less than 1 Ω (Ohm-meter scale: Rx1) • Filament terminal 2. Measure the resistance. Normal: ∞ (Ohm-meter scale: Rx1000) • Filament to chassis 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: ∞ 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
NOTE: Make sure heater is fully cooled when tested. GRILL THERMOSTAT 0°C~Approx.90°C Approx.90°C OVEN THERMOSTAT MAGNETRON 0°C~Approx.145°C Approx.145°C 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
Turntable drags or makes Distribute food evenly. Cook IExcessive weight on tray or noise. smaller portions and,or use improperly balanced. lighter weight cookware. 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. Check continuity No continuity. Defective power Replace power of power supply supply cord. supply cord. cord. Copyright © 2007 LG Electronics. Inc. All right reserved. 5-14 LGE Internal Use Only Only for training and service purposes...
Page 25
Abnormal. output. magnetron. magnetron. NOTE: Simple test of power output-conducted by heating one liter water for one min. if available. 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
EXPLODED VIEW INTRODUCTION MODEL: MH-6387AR OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS Copyright © 2007 LG Electronics. Inc. All right reserved. -6-1- LGE Internal Use Only Only for training and service purposes...
Page 29
#EV# DOOR PARTS 13581A 13536A 13552A 13213A 13720D 14890A 14026A WTT028 14970A 13650A LGE Internal Use Only -6-2- Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 30
#EV# CONTROL PANEL PARTS WTP013 268711 268712 23572A 25020M 23806C WTP004 249401 243501 25020S 24781S Copyright © 2007 LG Electronics. Inc. All right reserved. -6-3- LGE Internal Use Only Only for training and service purposes...
Page 31
348102 WTT021 WTP004 348101 44360A 348101 WTT020 WTT011 33052M 33112U 35026G 4980W1A058B 35026C 368771 33390G 36549S 35300A 34370T WTP013 35889A LGE Internal Use Only -6-4- Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 32
#EV# LATCH BOARD PARTS 43501A 43500A 466001 466003 466001 44510A WSZ085 Copyright © 2007 LG Electronics. Inc. All right reserved. -6-5- LGE Internal Use Only Only for training and service purposes...
Page 33
56201A WTT028 56549F 54974S WSZ002 55900A WTT037 WSZ002 50CZZH WTP004 56930G 56912B WSZ002 948501 56851C 55262A 54810C WTT028 56324A WSZ002 LGE Internal Use Only -6-6- Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
Page 34
#EV# BASE PLATE PARTS 56170D 63302A 63303A 65006B WSZ002 WTT021 Copyright © 2007 LG Electronics. Inc. All right reserved. -6-7- LGE Internal Use Only Only for training and service purposes...
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