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microwave keeps blowing fuses?

My Kenmore Micro/Conv oven keeps blowing fuses. A new fuse will allow the display to work, but as soon as I try to start the cooking process it immediately blows. How do I troubleshoot to find what item is the culprit?
Model #721.89972590
Bill, November 2007
fuse should be replaced with the same kind/ type...ie., for example::..15v can only be replaced with 15v no less no more. hope that helps.

Rocky, January 2010
I have the same problem magnetron is ok as is power supply, Cap is good and diode checks out. motor both fan and table are ok

I am at my wits end

bamabrit, November 2009
link Click here to see other fixes for Kenmore.