• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

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Bosch HMB5051/01 Microwave Blown Fuse but what else?


May 8, 2022
Model Number
6-10 years
I picked up a Bosch HMB5051 for free from someone who was giving it away because it was broken. Figured I'd tinker around with it for fun. Never have worked with microwaves before, but have done some electrical stuff. It was a bit confusing opening it up at first because it has an inverter which I was not expecting.

The microwave doesn't turn on at all. The ceramic fuse is blown, but all three door switches work. I checked them twice both manually flipping their switches and then opening and closing the microwave door to check that the latch was working correctly. All three worked. I checked the magnetron using the multimeter across the the terminals and got continuity. There was no continuity from the terminals to the magnetron casing.

I don't want to replace the fuse only to have it blow again. Is there something else I should be checking before replacing the fuse?
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