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We have a Emerson Microwave Oven model # MW8115SS and it has power, but does not heat up. Key pad and light inside work. Where do I find the fuses to check and possibly replace?

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  • Ovens Master
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You have to remove the 4 side screws and the 4 rear screws of the chassis cover then slide the cover to the rear about 3/4" life the rear of the cover about 30 degrees and remove the cover. Follow the power lead to the first connection and you will see a fuse holder. This is normally a 20 Amp slo-blo fuse. The fuse fails either from a bad power diode that is near the HV capacitor or a bad HV capacitor most of the time. MAKE SURE YOU DISCHARGE THE CAPACITOR BEFORE reaching inside the cabinet. Take a screwdriver and ground across the terminals at least 3 times.

You read the diode with a meter using R X 10,000 it will read zero ohms with the leads in one direction and infinity when the leads are reversed. You must disconnet at least one terminal from the diode to read it properly.

You test the HV capacitor using the same meter setting and reversing the leads. Eavh time you reverse the leads your watching for a momentary jump in capacitance and then the meter moves to infinity. If it reads continuity or no jump then the HV capacitor is bad.

This microwave has been around for quite some time.... so long that there are few manuals out there for it. If you find a failed part.. walk into your nearest appliance parts source with the failed part in hand. Use of GENERIC parts is fine.

Thanks for choosing FixYa,
Kelly

Posted on Mar 31, 2011

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