If it stopped working while you were cooking my first guess is that the magnetron TCO got hot and opened. It is supposed to reset after cooling down, but if it is old it may not have done so. Of course, there should be at least two door switches that close when you close the door. There is also a monitor switch that closes when opening the door (open with door closed). If you remove the control you should be able to check continuity on all switches, but you need to remove the wires to get a true reading. Some M/O have a TCO on top of the cavity, but you need to remove the cover to get to that. If you need more help, just get back to me.
Make sure that the program controller is working if not check
power - step down supply, the pads are responding- if not faulty pads- or the
door switches, if the switch contact are not good then it will not trigger the
processor to switch on the waveguides. If the lights or fan work without any
display or action of program being triggered to start then it can be a possible
fault on the main board or the processor. Sometimes insect secretion can short
the board and display panel and so the processor can work in such an erratic
manner. If so clean, solder and reset the board. Now identify the parts by
clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html
If there is no heating
please do not switch on unless you have confirmed the fault. It is possible
that the Magnetron is faulty, the temperature cut off is faulty or the main
capacitor is short. It is also quite possible that insect can get into the oven
and create soft spots. When you switch on these will create a short and make
the voltage jump and in the long run damage the magnetron. Check this link to
know how a microwave works:
http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html
So Remove cover after disconnecting , check for dirt/moisture in
the cabin, if so wipe clean and dry, check the magnetron and area clean and use
an jet air to clean off. Check the wave guide covers, if food had deposited
then it must be checked or replaced. See link: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html
Now keeping clear of the
microwave, switch on; use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can
be faulty. replace with same type.
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