Goldstar MA-2005ST Function & Type 1/2, How a Microwave Oven Works, Type of Microwave Oven

Page 3

2-1. Function & Type (1/2)

1. How a Microwave Oven Works

The microwave oven is one of the great inventions of the 20th century - millions of homes in world have one. Microwave ovens are popular because they cook food incredibly quickly. They are also extremely efficient in their use of electricity because a microwave oven heats only the food - nothing else.

A microwave oven uses microwaves to heat food. Microwaves are radio waves. In the case of microwave ovens, the commonly used radio wave frequency is roughly 2,500 megahertz (2.5 gigahertz). Radio waves in this frequency range have an interesting property: they are absorbed by water, fats and sugars. When they are absorbed they are converted directly into atomic motion - heat. Microwaves in this frequency range have another interesting property: they are not absorbed by most plastics, glass or ceramics. Metal reflects microwaves, which is why metal pans do not work well in a microwave oven.

2. Type of Microwave Oven

1)MICROWAVE COOKING (solo model)

Using the energy of microwaves only, food is cooked quickly without altering its colour and shape. Microwaves generated by a magnetron enter the oven and cook the food evenly on a rotating turntable. Power control can be adjusted in 11 steps which can enable a variety of goods to cook at a suitable power for the best results.

- 8 -

Image 3
Contents Microwave Oven Safety Precautions Function & Type 1/2 How a Microwave Oven WorksType of Microwave Oven Grill Cooking Function & Type 2/2Installation Installation & Utensils 1/2Cooking Utensils Installation & Utensils 2/2What’s the microwave? 1/2 History of dielectric heatingPrinciple of dielectric heating Safety of microwave oven What’s the microwave? 2/2Definition of electric wave Conventional heating Conventional heating vs. dielectric heatingController Construction of microwave ovenCavity DoorHow 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 sensorLG’s Auto Moving Heater Auto moving heaterWhat’s does move automatically? Conventional HeaterSpecifications Control Panel FeaturesOperating Sequence Schematic Circuit Description Necessary Measuring Instruments Tools and Measuring InstrumentsMicrowave Leakage Test Necessary ToolsMeasurement with Outer Case Removed Measurement with a Fully Assembled OvenRecord Keeping and Notification After Measurement Control Panel Assembly Measurement of Microwave Power OutputDisassembly and Adjustment Power Supply CordDoor Main Assembly Removal PCB Assembly RemovalAIR Duct Assembly Removal Magnetron RemovalRemoving the Turntable Motor Interlock System FAN Motor Assembly RemovalHigh Voltage Transformer Removal High Voltage Capacitor and Diode RemovalInterlock Continuity Test Primary Interlock Switch TestSecondary Interlock Switch Test Monitor Switch 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