Since no model number was posted, I have to give a general answer.
Since it was posted under Panasonic, I'll assume it's a Panasonic.
See if one of these describes
what's happening:
If so, see
http://031d26d.namesecurehost.com/mwd/safety.txt
http://031d26d.namesecurehost.com/mwd/disassembly.txt
http://031d26d.namesecurehost.com/mwd/doorsw.txt
Otherwise, if
the digital programmer circuit / controller does not get a feedback
signal from the inverter for a period of 3 seconds, the controller will
stop the cook cycle.
It may be a loose connection in the wiring between the
inverter, magnetron, and/or control board, or maybe one of
those
components has failed.
If
it stops after 7 seconds, it has a problem with the inverter.
Due to the lethal
voltages used and produced in inverters, I do not recommend that an
inexperienced person work on these.
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