Question about Microwave Ovens
Hi Connor and welcome to FixYa, I am Kelly
There are 3 things that cause this symptom.
1. High voltage capacitor
2. Power diode
You can check the High voltage Capacitor by unplugging the unit and removing the outer cover.
Then locate the LARGE capacitor. Hold a screwdriver well back on the INSULATED handle and short across the terminals 3 times. If it is good it will for sure get your attention. (Bright Blue BANG) Then remove all of the terminals on ONE side of the capacitor. Probe the terminals with a multimeter set on R x 10K and watch for a jump in resistance and then it quickly drifts to infinity. Reverse the leads and do this again watching for a jump in resistance and then drift to infinity. It should do this each time you reverse the leads.
LOCATE the power diode it will have one wire or terminal that is connected to the HV Capacitor.
You must make sure one side of the diode does not have any connection. Then read resistance across the diode. Reverse the meter leads and read it again. It should show a very low resistance (ZERO "ish") in one direction and a very very high resistance or infinity in the other direction. Any other reading is a failed diode. I.e Zero both directions =Bad infinity both directions = BAD Resistance in ONE direction = good.
If both of the above pass the tests most likely the magnetron has failed. However if you happen to have 4 door interlock switches vs 3 you could have a bad door interlok switch. Since you said it makes all the right noise but does not heat... I suspect one of the 3 components above.
After repairs make sure you have reconnected the Capacitor and Diode.
Thanks for choosing FixYa,
Posted on Apr 11, 2011
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Posted on Jan 02, 2017
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