LG MS3447GR User Manual

MICROWAVE OVENSERVICE MANUALMODEL: MS3447GRMS3447GRSCAUTIONBEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.Website http://biz.lg

GENERAL DETAILS• The low voltage transformer supplies the necessaryvoltage to the micom controller when power cord isplugged in.• When the door is clo

NECESSARY TOOLSTools normally used for TV servicing are sufficient.Standard tools are listed below.• Diagonal pliers• Long nose pliers• Phillips screw

MEASUREMENT WITH OUTER CASEREMOVED• When you replace the magnetron, measure formicrowave energy leakage before the outer case isinstalled and after al

5-3A. OUTER CASE REMOVAL1) Disconnect the power supply cord from the outlet.2) Remove the screws from the rear of the case.The outer case must be move

D. PCB ASSEMBLY REMOVAL1) Remove the control panel assembly from thecavity. (Refer to control panel assembly removalon previous page.)2) Remove screws

F. AIR DUCT ASSEMBLY REMOVAL1) Disconnect the leadwire from the lamp.2) Remove the mounting screw to the magnetron.G. MAGNETRON REMOVAL1) Disconnect t

I. HIGH VOLTAGE TRANSFORMERREMOVAL1) Discharge the high voltage capacitor.2) Disconnect the lead wire from magnetron, high voltagetransformer, and cap

A. PRIMARY INTERLOCK SWITCH TESTWhen the door release button is depressed slowlywith the door closed, an audible click should beheard at the same time

5-8COMPONENT TEST PROCEDURECAUTIONS1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THEOUTER CASE FROM THE UNIT. PROCEED WITH THE

5-9COMPONENTS TEST PROCEDURE RESULTSHIGH VOLTAGECAPACITORHIGH VOLTAGEDIODENOTE :Some inexpensive metersmay indicate infiniteresistance in both directi

SAFETY PRECAUTIONSThis device is to be serviced only by properly qualified service personnel.Consult the service manual for proper service procedures

5-10COMPONENTS TEST PROCEDURE RESULTSRELAY 2FAN MOTOR(Wire leads removed)TURNTABLEMOTOR(Wire leads removed)Normal:A: Approx. 85 ~ 100 ohmB: Approx. 10

5-11TROUBLE SHOOTINGCAUTIONS1. Check grounding before checking for trouble.2. Be careful of the high voltage circuit.3. Discharge the high voltage cap

5-121. Incomplete segments.• Segment missing.• Partial segment missing.• Digit flickering (NOTE: Slight flickering is normal.)2. Colon does not turn o

5-13CONDITION CHECK RESULT CAUSE REMEDY1. Fuse blows. Continuity.No continuity.Continuity.Shorted contact atthe primary switch.Replace fuse,primary, m

5-14(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desiredprogram times are set and START pad is touched.(TROUBLE 4)

5-15CONDITION CHECK RESULT CAUSE REMEDYNo microwaveoscillation.No continuity.Continuity.Defective PCBassemblyReplace PCBassemblyDisconnect thewire lea

EXPLODED VIEW-6-1-INTRODUCTIONINTERIOR PARTSOVEN CAVITY PARTSDOOR PARTSCONTROL PANEL PARTSBASE PLATE PARTSLATCH BOARD PARTS#EV#MODEL: MS3447GRMS3447GR

DOOR PARTS-6-2-13552A13213A13581A14970A14026A13536A15006A13720D14890A#EV#

CONTROL PANEL PARTS-6-3-23572A23790D23506A24781MWTP01826871124510L25020124970A#EV#

OVEN CAVITY PARTS-6-4-33390GWTT010WTT02133112U35889A36549SWTP01333052A#EV#

CONTENTS(Page)SAFETY PRECAUTIONS ----------------------------------------------------------------------Inside front coverSPECIFICATIONS --------------

LARCH BOARD PARTS-6-5-WSZ08546600146600346600143500A43501A#EV#

INTERIOR PARTS-6-6-568771WSZ062WSZ002WEB001WSZ002WSZ002WTT028WTT02856411A56930V50FZZA56201A56549F54974SWTT03755900A54810CWTT02850CZZH34930W56324A55262

BASE PLATE PARTS-6-7-56170DWSZ002WTT02163302A65006B63303A948502#EV#

SPECIFICATIONS1-1This microwave oven is designed for household use only.It is not recommended for commercial purposes.DESCRIPTIONMS3447GR / MS3447GRS2

CAUTIONS2-1• DO NOT operate on a 2-wire extension cord duringrepair and use.• NEVER TOUCH any oven components or wiring duringoperation.• BEFORE TOUCH

INSTALLATION3-1INSTALLING1. Empty the microwave oven and clean inside it witha soft, damp cloth. Check for damage such asmisaligned door, damage aroun

OPERATING INSTRUCTIONS4-1FEATURESCONTROL PANEL 1. SENSOR REHEAT.2. SENSOR COOK.3. AUTO COOK: Used to select the auto cook4. AUTO REHEAT: Used to selec

4-2OPERATING SEQUENCEThe following is a description of component functionsduring oven operation.1. CANCEL FUNCTIONTouch the STOP/CLEAR pad wheneve

SCHEMATIC DIAGRAM4-3LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes