LG Electronics MS3447GR Interlock Continuity Test, Primary Interlock Switch Test, Switches

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INTERLOCK CONTINUITY TEST

WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.

TYPE NO.SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH

TYPE NO.SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH

TYPE NO.SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH

A. PRIMARY INTERLOCK SWITCH TEST

When the door release button is depressed slowly with the door closed, an audible click should be heard at the same time or successively at intervals. When the button is released slowly, the latches should activate the switches with an audible click.

If the latches do not activate the switches when the door is closed, the switches should be a adjusted in accordance with the adjustment procedure. Disconnect the wire lead from the primary switch. Connect the ohmmeter leads to the common (COM) and normally open (NO) terminal of the switch. The meter should indicate an open circuit in the door open condition. When the door is closed, the meter should indicate a closed circuit.

When the primary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.

B. SECONDARY INTERLOCK SWITCH TEST

Disconnect the wire lead from the secondary switch.

Connect the ohmmeter leads to the common (COM) and normally open (NO) terminals of the switch. The meter should indicate a open circuit in the door open condition. When the door is closed, meter should indicate an closed circuit. When the secondary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.

C. MONITOR SWITCH TEST

Disconnect the wire lead from the monitor switch. Connect the ohmmeter leads to the common (COM) and normally closed (NC) terminals of the switch. The meter should indicate closed circuit in the door open condition. When the door is closed, meter should indicate an open circuit. When the monitor switch operation is abnormal, replace with the same type of switch.

NOTE: After repairing the door or the interlock system, it is necessary to do this continuity test before operating the oven.

COMPONENTS

 

TEST PROCEDURE

RESULTS

 

SWITCHES

Check for continuity of the

Door

Door

(Wire leads removed)

switch with an Ohm-meter

open

closed

 

Primary

NO

 

 

 

Switch

COM

 

 

 

 

 

 

 

Monitor

NC

 

 

 

COM

 

 

 

Switch

 

 

 

 

 

 

 

Secondary

NO

 

 

 

Switch

COM

 

 

 

 

 

 

 

NOTE : After checking for the continuity of switches, make sure that they are

 

connected correctly.

 

 

LGE Internal Use Only

5-7

Copyright © 2007 LG Electronics. Inc. All right reserved.

 

 

Only for training and service purposes

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Contents Microwave Oven Microwave Radiation Safety PrecautionsContents Full power throughout the cooking time SpecificationsApprox % of Full power Approx %Antenna Microwave RadiationEarthing Instructions InstallationInstalling Operating Instructions Features Control PanelMore Pressing More will add 10 seconds to the cooking time Cooking timeOperating Sequence Schematic Diagram Circuit Description Tools and Measuring Instruments Service InformationMicrowave Leakage Test Necessary ToolsAround the magnetron Waveguide Measurement with Outer Case RemovedMeasurement with a Fully Assembled Oven Disassembly and Adjustment Measurement of Microwave Power OutputPower Supply Cord Control Panel AssemblyDoor Main Assembly Removal PCB Assembly RemovalMagnetron Removal AIR Duct Assembly RemovalRemoving the Turntable Motor Very CarefullyHigh Voltage Transformer Removal FAN Motor Assembly RemovalHigh Voltage Capacitor and Diode Removal Interlock SystemSecondary Interlock Switch Test Primary Interlock Switch TestMonitor Switch Test SwitchesHigh Voltage Transformer Wire leads removed Component Test ProcedureFilament Winding Primary Terminal MagnetronMeasure the resistance Normal Momentarily indicates High VoltageCapacitor Measure the continuity Forward Normal ContinuityRelay PowerLevel FAN MotorCondition Cause Remedy Trouble ShootingDefective key membrane assembly Defective PCB assembly Defective PCB assemblySome inputs cannot be programmed Continuity No continuityPower supply Check continuity Continuity Monitor Switch with Door closedReplace power supply cord Fuse blowsSecondary switch Setting time Check continuityDefective PCB Replace PCB Assembly Power source Rating voltage Voltage Normal DisconnectReplace high voltage diode Replace magnetron Defective PCB assembly Defective high voltage transformerAbnormal Defective PCB assembly Introduction Exploded ViewDoor Parts Control Panel Parts Oven Cavity Parts Larch Board Parts WTT021 WTP004 56501A 54974T Interior PartsBase Plate Parts

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