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Blown Fuse on a Sharp Microwave

Replaced the fuse and it blew again

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I answered your dupe post here:

Posted on Dec 31, 2016


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You need to know why the fuse blew first. two places that will cause the fuse to blow is excessive current being drawn from a shorted winding in the transformer or a bad magnetron unit. If the holder is loose, pinch the metal parts that contact the end of the fuse slightly to restore proper contact with the fuse.

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Sometimes when the mag shorts it takes out the inverter. I would measure the mag leads to ground and they should be open or 20M or so. If you have both a mag and inverter bad it's probably time for a new oven.

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Emerson Microwave Model MW8119SB found blown fuse. Replaced fuse power came back punched in 10 sec started microwave and fuse blew again.

Chances are that either the diode or capacitor are shorted. Be very careful, the capacitor can store a charge and should be discharged first for safety. Hope that helps...


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They might be referring to a diode connected to the big silver capicitor and screwed to the case.
These can go short circuit causing the fuse to fail.

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1.Problem with monitor door switch or
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