Related Manuals for LG MS3447GR
Summary of Contents for LG MS3447GR
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Page 1: Microwave Oven
Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MS3447GR MS3447GRS CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. July, 2007 P/NO : MFL31039007 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
Accessories Glass turntable Roller rest 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. • NEVER put anything into the latch hole and the interlock switches area. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes... -
Page 6: Installation
The wire which is colored brown must be connected to the terminal in the plug which is marked with the letter L or colored red. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes... -
Page 7: Operating Instructions
11. STOP/CLEAR: It used to stop oven and clear all entries except time of day. 12. START/Q-START: To quickly set the cooking time directly. LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes... -
Page 8: Operating Sequence
NOTE: Then the oven will start automatically. NUMBER START 5. AUTO DEFROST COOKING AUTO STOP/CLEAR NUMBER DEFROST NUMBER OF START WEIGHT 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
This 3.3 volts is applied to the magnetron to heat the magnetron filament through two noise-preventing choke coils. MICOM CONTROLLER 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...
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Page 13: Measurement Of Microwave Power Output
5) Lift up and pull out control panel assembly carefully from the cavity. 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 If the door assembly is not mounted properly, microwaves may leak from the clearance between the door and the oven. Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
- Page 15 Air duct Magnetron Waveguide Taptite Screw Dome Waveguide Bracket Magnetron Gasket Wire Leads Magnetron Turntable Motor LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
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Page 16: Diode Removal
Make sure the primary, monitor, and secondary switches operate properly by H.V. following the continuity test procedure. Diode Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes... -
Page 17: Interlock Continuity Test
Switch Monitor Switch Secondary Switch NOTE : After checking for the continuity of switches, make sure that they 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 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 Some inexpensive meters may indicate infinite resistance in both direction. Normal: Infinite. 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 • 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. 5-10 LGE Internal Use Only...
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Page 21: Trouble Shooting
Inconsistent intensity of Uneven cooking. 2. Stir once or twice while microwave by their cooking soup, cocoa or characteristics. milk, etc. LGE Internal Use Only 5-11 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes... - Page 22 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. 5-12 LGE Internal Use Only Only for training and service purposes...
- Page 23 Continuity. Check continuity No continuity. Defective power Replace power of power supply supply cord. supply cord. cord. LGE Internal Use Only 5-13 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
- Page 24 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. 5-14 LGE Internal Use Only Only for training and service purposes...
- Page 25 2 and check continuity relay 2. (Operate the unit) LGE Internal Use Only 5-15 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
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Page 26: Exploded View
#EV# EXPLODED VIEW INTRODUCTION MODEL: MS3447GR MS3447GRS OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS -6-1-... - Page 27 #EV# DOOR PARTS 15006A 13581A 13552A 13536A 13213A 14890A 13720D 14026A 14970A -6-2-...
- Page 28 #EV# CONTROL PANEL PARTS 24781M 23790D 23572A 268711 WTP018 23506A 24510L 24970A 250201 -6-3-...
- Page 29 #EV# OVEN CAVITY PARTS 33112U WTT021 33052A WTT010 33390G 36549S 35889A WTP013 -6-4-...
- Page 30 #EV# LARCH BOARD PARTS WSZ 085 466001 43501A 43500A 466003 466001 -6-5-...
- Page 31 #EV# INTERIOR PARTS 568771 WSZ062 56411A WTT021 WTP004 56501A 54974T 50FZZA 56930V 56201A 34930W 56549F WTT028 54974S WEB001 55900A WTT037 WSZ 002 WTT028 50CZZH 35012A WSZ002 54810C 56912B WSZ002 56324A WTT028 WSZ002 948501 55262A 56851D 948502 56901A 56201B -6-6-...
- Page 32 #EV# BASE PLATE PARTS 56170D 63302A 63303A 948502 65006B WSZ002 WTT021 -6-7-...