Manuals / LG Electronics / Kitchen Appliance / Microwave Oven

LG Electronics LMV1625B, LMV1625W service manual Printed Circuit Board

Models: LMV1625W LMV1625B

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PRINTED CIRCUIT BOARD

PRINTED CIRCUIT BOARD

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LG Electronics LMV1625B, LMV1625W service manual Printed Circuit Board

Contents

SERVICE MANUAL SAFETY PRECAUTIONS IN THIS MANUALMICROWAVE OVEN MODEL LMV1625B LMV1625WTO EXCESSIVE MICROWAVE ENERGY SAFETY PRECAUTIONS PRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLE EXPOSURE FOREWORD TABLE OF CONTENTSSPECIFICATIONS 1,500W maximum Microwave oven+Cook top lamp+Ventilation fanCAUTIONS MICROWAVE RADIATIONMAGNETRON GasketGROUNDING INSTRUCTIONS INSTALLATIONSPRECAUTIONS ON INSTALLATION OPERATING INSTRUCTIONS CONTROL PANELCONTROL PANEL INSTRUCTIONS OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAMMATRIX CIRCUIT FOR TOUCH KEY BOARD GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USEFEATURES AND SPECIFICATIONS FEATURES TRIAL OPERATIONSERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPSMICROWAVE LEAKAGE TEST EQUIPMENTIf the oven operates with the door open, the service personnel should Tell the user not to operate the ovenNOTE WHEN MEASURING POWER OUTPUT MEASUREMENTMEASUREMENT WITH THE OUTER CASE REMOVED MEASUREMENT WITH A FULLY ASSEMBLED OVENIMPORTANT NOTES DISASSEMBLY INSTRUCTIONSA. REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1, 2 and HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTORB. REMOVING THE OUT CASEFigure C REMOVING THE DOOR INTERLOCK SWITCHES Figures 9,10 D. REMOVING MAGNETRON CAUTION Be careful not to damage door seal plate with the screwdriver F. REMOVING DOOR FigureG. DISASSEMBLING DOOR Figure H. ASSEMBLING DOOR I. REMOVING THE VENTILATION FANASSYK. REMOVING THE TURNTABLE MOTOR INTERLOCK SYSTEM ADJUSTMENT PROCEDURESCHECK THE DOOR LATCH AND SWITCH CLOSING ADJUST THE LATCH AND SWITCH CLOSINGTEST THE LATCH AND SWITCH SEQUENCE TEST THE MICROWAVE ENERGY LEAKAGEINTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TESTB. SECONDARY INTERLOCK SWITCH TEST C. MONITOR SWITCH TESTTEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING TEST PROCEDURESCOMPONENTS RESULTSTEST PROCEDURES COMPONENTSRESULTS Figure 25-aTEST PROCEDURES COMPONENTSRESULTS Measure the resistance between terminal1 CHECKOUT PROCEDURES FOR FUSE BLOWING TEST PROCEDURESwCAUTION The relay connector 2White These two connectors are not Inter2 CHECKOUT PROCEDURES FOR RELAY PROBLEM A Remove the mate connector of I/O CON from the circuit boardDefective RELAY3 Replace RELAY3 PROBLEM B GOOD3 CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board3 Proper temperature measurement is not obtained 8 Some of the indicators do no flicker light upRuns PROBLEM - C Unit does not heat up even if display counts down when PROBLEM - D No buzzing when touching the key, between Check 1. POWER SUPPLY 13552A 13581A 13536A 13213A 13720D WTT021 14890A 14026A 14970A 13650A EXPLODED VIEWDOOR PARTS 23506A CONTROLLER PARTS268711 24781M 24810P WTP018 23572A WTT029 OVEN CAVITY PARTS 33530A34930R 35026G 33052A 33550L 36912C WTT022 35230A WTT021LATCH BOARD PARTS 43500A466001 WSZ084INTERIOR PARTSI 33390G 34370TWSZ002 35889AINTERIOR PARTS 56912B36549V 55231C 53550L 56804AINSTALLATION PARTS WSZ20344360A WSZ098 WSZ133 WSZ204SCHEMATIC DIAGRAMPRINTED CIRCUIT BOARD P/NO. 3828W5S3242 Printed in Korea