Manuals / LG Electronics / Kitchen Appliance / Microwave Oven

LG Electronics MS3447GRS service manual Components, Test Procedure, Results

Models: MS3447GR MS3447GRS

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COMPONENTS

TEST PROCEDURE

RESULTS

Antenna

Gasket

Chassis

		Filament
		Filament

	NOTE: When testing the magnetron, be sure to install the magnetron gasket
	in the correct position and be sure that the gasket is in good condition.


HIGH VOLTAGE	Measure the resistance.	Normal: Momentarily indicates
CAPACITOR	(Ohm-meter scale: Rx1000)	several ohms, and
	• Terminal to terminal.	then gradually returns
		to infinite.

Measure the resistance.	Normal: Infinite.
(Ohm-meter scale: Rx1000)
• Terminal to case.

HIGH VOLTAGE	Measure the continuity (Forward).	Normal: Continuity.
DIODE	(Ohm-meter scale: Rx10000)	Abnormal: Infinite.

NOTE :
Some inexpensive meters
may indicate infinite
resistance in both direction.	Measure the continuity (Reverse).	Normal: Infinite.
	(Ohm-meter scale: Rx10000)	Abnormal: Continuity.

LGE Internal Use Only	5-9	Copyright © 2007 LG Electronics. Inc. All right reserved.
		Only for training and service purposes

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LG Electronics MS3447GRS service manual Components, Test Procedure, Results

Contents

P/NO MFL31039007 Website http//biz.lgservice.comBEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL JulyMICROWAVE RADIATION SAFETY PRECAUTIONSLGE Internal Use Only CONTENTSOnly for training and service purposes SERVICE INFORMATIONMS3447GR / MS3447GRS SPECIFICATIONSDESCRIPTION MODELNEVER put iron tools on the magnetron CAUTIONSNEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity10cm INSTALLATIONINSTALLING EARTHING INSTRUCTIONS1. SENSOR REHEAT 2. SENSOR COOK FEATURESOPERATING INSTRUCTIONS CONTROL PANEL6. CHILD LOCK 1. CANCEL FUNCTIONOPERATING SEQUENCE 2. AUTO TOUCHCopyright 2007 LG Electronics. Inc. All right reserved SCHEMATIC DIAGRAMOnly for training and service purposes LGE Internal Use OnlyWHEN THE DOOR IS OPENED DURING COOKING WHEN SELECTING COOKING POWER LEVEL AND TIMEWHEN TOUCHING THE START PAD WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUMMICROWAVE LEAKAGE TEST SERVICE INFORMATIONIf the oven operates with the door open, the service personnel should TOOLS AND MEASURING INSTRUMENTSWARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS NOTES WHEN MEASURINGMEASUREMENT WITH OUTER CASE REMOVED MEASUREMENT WITH A FULLY ASSEMBLED OVENC. CONTROL PANEL ASSEMBLY MEASUREMENT OF MICROWAVE POWER OUTPUTDISASSEMBLY AND ADJUSTMENT B. POWER SUPPLY CORDE. DOOR MAIN ASSEMBLY REMOVAL D. PCB ASSEMBLY REMOVALCAUTION Be careful not to damage door seal plate by screwdriver G. MAGNETRON REMOVAL F. AIR DUCT ASSEMBLY REMOVALH. REMOVING THE TURNTABLE MOTOR L. INTERLOCK SYSTEM J. FAN MOTOR ASSEMBLY REMOVALI. HIGH VOLTAGE TRANSFORMER REMOVAL K. HIGH VOLTAGE CAPACITOR AND DIODE REMOVALTEST PROCEDURE A. PRIMARY INTERLOCK SWITCH TESTB. SECONDARY INTERLOCK SWITCH TEST C. MONITOR SWITCH TESTCOMPONENTS COMPONENT TEST PROCEDURETEST PROCEDURE CAUTIONSCOMPONENTS TEST PROCEDURERESULTS COMPONENTS 5-10Relay TEST PROCEDUREREMEDY TROUBLE SHOOTINGCONDITION CAUSECONDITION CHECKRESULT 5-12CHECK RESULT5-13 CONDITIONREMEDY CONDITIONCHECK CAUSECHECK NOTE Make sure the wire leads correct position5-15 CONDITIONINTERIOR PARTS EXPLODED VIEWINTRODUCTION OVEN CAVITY PARTS15006A 13581A 13552A 13536A 13213A 14890A 13720D 14026A 14970A DOOR PARTS24781M 23572A 23790D 268711 WTP018 23506A 24510L 24970A CONTROL PANEL PARTS36549S WTP013 OVEN CAVITY PARTS33112U 33052A WTT010 33390GWSZ085 466001 43501A 43500A LARCH BOARD PARTS56549F INTERIOR PARTSWTT021 WTP004 56501A 54974T 56901A56170D 63302A 63303A 948502 65006B WSZ002 WTT021 BASE PLATE PARTS