Just went dead, changed the fuse, went dead again, what is it.? Some web site said thermostate, but I think there are two in my microwave, please advise
Normally when there is an issue in which the ceramic fuse keeps blowing the issue is with the door switches in which the switches would need to be replaced at the same time as the fuse.
My microwave is not heating.
Answer Hello Roger. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.