How To Troubleshoot Magnetron
How To Troubleshoot Magnetron
Magnetron is designed to generate microwaves. The physics of the magnetron is quite complicated. It is using strong external magnetic field to direct the flow of electrons in a resonant circular cavity developing tens and hundreds of watts at frequencies around 2.45 GHz. Magnetron can be tested on continuity only. The volume resistance of the terminals should be less than 1Ω. The insulation resistance between the two terminals and the housing should be infinite.
It may also be possible to detect faulty magnetron when it starts making loud humming noises. A magnetron with a short between the filament (cathode and anode) is likely to cause a loud hum when the cook cycle is initiated. Evidence of arcing (burned spots around ventilation holes in base or a burnt odor) usually indicates a bad magnetron as well. Melting or other damage to the antenna might be the result of arcing due to problems in the oven cavity or waveguide, perhaps operating microwave oven with nothing inside the oven.
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