Goldstar MA-2005ST service manual Microwave generation systemMagnetron 1/2

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4-4. Microwave generation system_Magnetron (1/2)

GASKET

FILAMENT (CATHODE)

ANODE

MAGNET (FERRITE)

FILTER CASE

FILTER

ANTENNA (OUTPUT) MAGNET (MAGNETIC CIRCUIT)

VANE

FILAMENT TERMINALS

FEED THROUGH CAPACITOR

ELECTRONS

ANODE

ANTENNA

CATHODE

*The magnetron is the energy source for the microwave oven. The magnetron is a vacuum tube of special construction.

It is basically a diode with addition of a magnetic field.

It consists of a small, coiled heating element (filament) made of tungsten which readily emits electrons when heated.

This element serves as the cathode (negative element) within the tube. The anode (positive element of the tube) consists of a thick walled copper cylinder with vertical vanes extending inward which surround but do not touch the cathode.

To complete the magnetron, and make it operate distinctly different from other vacuum tubes, two permanent magnets are mounted over each end of the tube.

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Contents Microwave Oven Safety Precautions How a Microwave Oven Works Function & Type 1/2Type of Microwave Oven Grill Cooking Function & Type 2/2Installation Installation & Utensils 1/2Cooking Utensils Installation & Utensils 2/2History of dielectric heating What’s the microwave? 1/2Principle of dielectric heating What’s the microwave? 2/2 Safety of microwave ovenDefinition of electric wave Conventional heating Conventional heating vs. dielectric heatingCavity Construction of microwave ovenDoor ControllerHow does the microwave oven operate? Input Senondary Winding AT Microwave generation systemMagnetron 1/2 Microwave generation systemMagnetron 2/2 Testing Magnetron TubeMultiwave system What is Multi-WaveWhat’s the infrared sensor? Infrared sensorWhat’s does move automatically? Auto moving heaterConventional Heater LG’s Auto Moving HeaterSpecifications Control Panel FeaturesOperating Sequence Schematic Circuit Description Microwave Leakage Test Tools and Measuring InstrumentsNecessary Tools Necessary Measuring InstrumentsMeasurement with a Fully Assembled Oven Measurement with Outer Case RemovedRecord Keeping and Notification After Measurement 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 High Voltage Transformer Removal FAN Motor Assembly RemovalHigh Voltage Capacitor and Diode Removal Interlock SystemSecondary Interlock Switch Test Primary Interlock Switch TestMonitor Switch Test Interlock Continuity TestComponents Test Procedure Component Test ProcedureComponents Test Procedure Results Relay Condition Cause Remedy Trouble ShootingResult Result Condition Check Defective PCB assembly Defective high voltage transformer Introduction Exploded ViewDoor Parts Controller Parts Oven Cavity Parts Latch Board Parts Interior Parts Base Plate Parts Schematic Diagram of P.C.B Printed Circuit Board