LG Electronics MS3447GRS High Voltage Transformer Removal, FAN Motor Assembly Removal

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I. HIGH VOLTAGE TRANSFORMER REMOVAL

1)Discharge the high voltage capacitor.

2)Disconnect the lead wire from magnetron, high voltage transformer, and capacitor.

3)Remove the screw holding the high voltage transformer to the baseplate.

J. FAN MOTOR ASSEMBLY REMOVAL

1)Discharge the high voltage capacitor.

2)Disconnect the lead wire from fan motor and high voltage capacitor.

3)Remove the two screws holding the the suction guide ASS’Y to the oven cavity and remove the high voltage diode earth screw.

4)Remove the two screws holding the fan motor ASS’Y to the suction guide ASS’Y.

K. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL

1)Discharge the high voltage capacitor.

2)Disconnect the lead wire from fan motor and high voltage capacitor.

3)Remove the screw holding the suction guide ASS’Y to the oven cavity and remove the high voltage diode earth screw.

4)Remove the screw holding the high voltage capacitor bracket.

 

Fan Motor

 

ASS’Y

 

Suction

 

Guide

H.V.

 

Transformer

H.V.

 

 

Capacitor

 

H.V.

 

Diode

L. INTERLOCK SYSTEM

1)INTERLOCK MECHANISM

The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage.

ADJUSTMENT

DIRECTION

SECONDARY

SWITCH

MONITOR

SWITCH

PRIMARY

SWITCH

2)MOUNTING OF THE PRIMARY/MONITOR/ SECONDARY SWITCHES TO THE LATCH BOARD

3)INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY

•Mount the latch board to the oven assembly.

•Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed.

•Tighten the mounting screw.

•Check for play in the door by pushing the door release button. Door movement should be less than 0.5 mm. (1/64 inch)

Don't push the door release button while making this adjustment. Make sure that the latch moves smoothly after adjustment is completed and that the screws are tight. Make sure the primary, monitor, and secondary switches operate properly by following the continuity test procedure.

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

5-6

LGE Internal Use Only

Only for training and service purposes

 

 

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Contents Microwave Oven Safety Precautions Microwave RadiationContents Specifications Full power throughout the cooking timeApprox % of Full power Approx %Microwave Radiation AntennaInstalling InstallationEarthing Instructions Features Control Panel Operating InstructionsMore Pressing More will add 10 seconds to the cooking time Cooking timeOperating Sequence Schematic Diagram Circuit Description Service Information Tools and Measuring InstrumentsMicrowave Leakage Test Necessary ToolsMeasurement with a Fully Assembled Oven Measurement with Outer Case RemovedAround the magnetron Waveguide Measurement of Microwave Power Output Disassembly and AdjustmentPower Supply Cord Control Panel AssemblyPCB Assembly Removal Door Main Assembly RemovalAIR Duct Assembly Removal Magnetron RemovalRemoving the Turntable Motor Very CarefullyFAN Motor Assembly Removal High Voltage Transformer RemovalHigh Voltage Capacitor and Diode Removal Interlock SystemPrimary Interlock Switch Test Secondary Interlock Switch TestMonitor Switch Test SwitchesComponent Test Procedure High Voltage Transformer Wire leads removedFilament Winding Primary Terminal MagnetronHigh Voltage Measure the resistance Normal Momentarily indicatesCapacitor Measure the continuity Forward Normal ContinuityPower RelayLevel FAN MotorTrouble Shooting Condition Cause RemedyDefective PCB assembly Defective key membrane assembly Defective PCB assemblySome inputs cannot be programmed Continuity No continuityCheck continuity Continuity Monitor Switch with Door closed Power supplyReplace power supply cord Fuse blowsSetting time Check continuity Secondary switchDefective PCB Replace PCB Assembly Power source Rating voltage Voltage Normal DisconnectAbnormal Defective PCB assembly Defective PCB assembly Defective high voltage transformerReplace high voltage diode Replace magnetron Exploded View IntroductionDoor Parts Control Panel Parts Oven Cavity Parts Larch Board Parts Interior Parts WTT021 WTP004 56501A 54974TBase Plate Parts

MS3447GR, MS3447GRS specifications

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