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LG Electronics LMV1625W, LMV1625B service manual Disassembly Instructions, Important Notes

Models: LMV1625W LMV1625B

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DISASSEMBLY INSTRUCTIONS

DISASSEMBLY INSTRUCTIONS

IMPORTANT NOTES:

UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED.

THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE - I.E. TEST PROBE CONNECTED TO 10K-OHM RESISTOR IN SERIES TO GROUND.

WHEN RECONNECTING THE WIRE LEADS TO ANY PART, MAKE SURE THE WIRING CONNE- CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR- CUIT DIAGRAM. (ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT.)

A.REMOVING POWER AND CONTROL CIRCUIT BOARD (Figures 1, 2 and 3)

(1)Remove a screw securing the control panel assembly to the oven cavity.

(2)Remove the control panel with pushing it upward.

(3)Remove the connector (CN1) and wire leads (Relay6) from the circuit board.

Control Panel

Screw

Power Transformer

Relay 7

(Relay 7)

(CN1)

(4) Remove 2 screws securing the circuit board.

Circuit Board

Figure 2

(5)Remove the FPC connector from the terminal socket following “HOW TO REMOVE THE FPC CONNECTOR” on the next page.

(6)Remove the circuit board from the control bracket carefully.

Control Bracket

FPC Connector(S1)

Circuit Board

Figure 1

Figure 3

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Image 15

LG Electronics LMV1625W, LMV1625B service manual Disassembly Instructions, Important Notes

Contents

MODEL LMV1625B LMV1625W SERVICE MANUALSAFETY PRECAUTIONS IN THIS MANUAL MICROWAVE OVENSAFETY PRECAUTIONS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURETO EXCESSIVE MICROWAVE ENERGY TABLE OF CONTENTS FOREWORD1,500W maximum Microwave oven+Cook top lamp+Ventilation fan SPECIFICATIONSGasket CAUTIONSMICROWAVE RADIATION MAGNETRONINSTALLATIONS PRECAUTIONS ON INSTALLATIONGROUNDING INSTRUCTIONS CONTROL PANEL OPERATING INSTRUCTIONSCONTROL PANEL INSTRUCTIONS SCHEMATIC DIAGRAM OVERALL CIRCUIT DIAGRAMMATRIX CIRCUIT FOR TOUCH KEY BOARD TRIAL OPERATION GENERAL INFORMATION FOR SERVICEGENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS FEATURESPRECAUTIONS AND REPAIR SERVICE TIPS SERVICE INFORMATIONTell the user not to operate the oven MICROWAVE LEAKAGE TESTEQUIPMENT If the oven operates with the door open, the service personnel shouldMEASUREMENT WITH A FULLY ASSEMBLED OVEN NOTE WHEN MEASURINGPOWER OUTPUT MEASUREMENT MEASUREMENT WITH THE OUTER CASE REMOVEDDISASSEMBLY INSTRUCTIONS A. REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1, 2 andIMPORTANT NOTES HOW TO INSERT THE F.P.C. CONNECTOR HOW TO REMOVE THE F.P.C. CONNECTORB. REMOVING THE OUT CASEFigure C REMOVING THE DOOR INTERLOCK SWITCHES Figures 9,10 D. REMOVING MAGNETRON F. REMOVING DOOR Figure G. DISASSEMBLING DOOR FigureCAUTION Be careful not to damage door seal plate with the screwdriver I. REMOVING THE VENTILATION FANASSY H. ASSEMBLING DOORK. REMOVING THE TURNTABLE MOTOR ADJUST THE LATCH AND SWITCH CLOSING INTERLOCK SYSTEMADJUSTMENT PROCEDURES CHECK THE DOOR LATCH AND SWITCH CLOSINGTEST THE MICROWAVE ENERGY LEAKAGE TEST THE LATCH AND SWITCH SEQUENCEC. MONITOR SWITCH TEST INTERLOCK CONTINUITY TESTA. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TESTRESULTS TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTINGTEST PROCEDURES COMPONENTSFigure 25-a TEST PROCEDURESCOMPONENTS RESULTSMeasure the resistance between terminal TEST PROCEDURESCOMPONENTS RESULTSThese two connectors are not Inter 1 CHECKOUT PROCEDURES FOR FUSE BLOWINGTEST PROCEDURES wCAUTION The relay connector 2WhiteGOOD 2 CHECKOUT PROCEDURES FOR RELAY PROBLEM ARemove the mate connector of I/O CON from the circuit board Defective RELAY3 Replace RELAY3 PROBLEM B8 Some of the indicators do no flicker light up 3 CHECKOUT PROCEDURES FOR CIRCUIT BOARDThe following symptoms indicate a defective circuit board 3 Proper temperature measurement is not obtainedRuns 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 EXPLODED VIEW DOOR PARTS13552A 13581A 13536A 13213A 13720D WTT021 14890A 14026A 14970A 13650A CONTROLLER PARTS 268711 24781M 24810P WTP018 23572A WTT02923506A WTT021 OVEN CAVITY PARTS33530A 34930R 35026G 33052A 33550L 36912C WTT022 35230AWSZ084 LATCH BOARD PARTS43500A 46600135889A INTERIOR PARTSI33390G 34370T WSZ00255231C 53550L 56804A INTERIOR PARTS56912B 36549VWSZ204 INSTALLATION PARTSWSZ203 44360A WSZ098 WSZ133DIAGRAM SCHEMATICPRINTED CIRCUIT BOARD Printed in Korea P/NO. 3828W5S3242