Question about Maytag MMC5000 Microwave Oven

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Whirpool Microwave My microwave just stop working,No power at all.I've opened it and found a blown fuse.I replaced the fuse w/ the same rating but when i power on the fuse blown again.I can't find any defective parts inside.Pls. help,I'm also a technician.Thank you very much.

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  • Renato Jardiolin Jan 06, 2007

    Ok,Thanks for the quick response.When i hit the start botton it runs for about 2 seconds then stops,no power at all,Fuse blown again.So the capacitor is defective.Is it worth if i changes the capacitor or
    i just buy a new microwave.BTW how much is the capacitor?Thank you..

  • Renato Jardiolin Jan 08, 2007

    Thank you for the response...

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1 Answer

William Miller

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You say when you "power on" the fuse blows? If that means when you hit the START button to cook, then you probably have a shorted high-voltage capacitor. If you mean it blows when you plug it in, you probably have a shorted door switch. Your microwave may also have a wiring diagram pasted on the inside of the outer wrapper or in an envelope. That will help in your tests.

Posted on Jan 05, 2007

  • William Miller
    William Miller Jan 06, 2007

    It's more likely to be your high-voltage transformer, but you seem qualified to do the diagnosis.

    Here's a good place to order the parts:http://tinyurl.com/gv383

  • William Miller
    William Miller Jan 08, 2007

    If the fuse blows immediately when you hit START, then it's the HV capacitor.

    Since you say it blows 2 seconds after you hit START, it's probably the HV transformer.

    To order parts and see exploded views, tryhttp://tinyurl.com/gv383

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1 Answer

The microwave has no lights, power or anything. The socket works but it's like the microwave is receiving no power.
You probably have a blown fuse inside your microwave.

Unplug your microwave and turn it around and remove the screws holding cover on and then remove the cover. Look for where the power cord goes into the back of the unit and follow the black wire from the cord to where it ends. It should stop an either a circuit board or a fuse holder. Make sure that you replace the fuse with the same amperage fuse as what you take out. You will find the amp rating stamped on one of the silver collars on each end of the fuse. Good luck!

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Sharp r957 micro wave keeps blowing small ceramic internal fuse /replaced magnetron/fuse then blow again/replaced capacitor/fuse again/blown again/ could problem be power transformer?
Maybe... Did you check the high voltage diode?... A shorted diode keeps the fuse blown... Ty

Jul 02, 2011 | Sharp R930AWWT Microwave Oven

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OSTER MICROWAVE 1.1 MOD OGF41101-RUNS BUT WON'T HEAT.
There are two fuses in a microwave oven, and for the non-heating problem the problem is the high voltage fuse, incapsulated between the transfo and the magnetron. This supports up to 5000V and usually rated something like 0.65A/0.7A/0.8A and even 1A.
When you open the capsule, you'll see it sitting there between its two connectors, and you'll notice the filament inside the glace is broken. Buy a new one and your machine will work like a horse.
NOTE: Try to get the same ratings fuse, or else the oven will smoke and smoke the house with it, so be careful.
The other fuse is smaller, and usually ceramic one, which can be found on the PCB, if that goes, you should get no power at all to the machine. If not sure, let a professional do the job, it's safer.

Apr 09, 2010 | Westpoint TV-201 Microwave Oven

1 Answer

My spacemaker stopped working and no panel lights. It's not the circuit breaker. Any ideas? model JVM140001
Could be the fuse inside the microwave is blown. You will need to unplug the microwave and remove the front control panel. Inisde the microwave housing you will need to trace the electrical wire coming into the unit. Usually you will find the in-line fuse located on the black power wire. You can pull the connectors off the fuse and test it with a continuity tester. If the fuse is blown replace it but make sure you use the same amp rated fuse as you removed. If the fuse blows again then there is an electrical short somewhere in the microwave.

Dec 24, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Not heating
Remove the outer cover (pull the power plug first) and look for a blown fuse. If found, replace the high voltage diode and the 'stirrer' (a fan-like device located within the sheet metal wave-guide near the opening in the cooking cavity where the microwaves come into it). This stirrer has a plastic bearing that frequently arcs over and permanently shorts out the microwaves which blows the fuse. If no blown fuse is found, look for a loose or defective door-interlock micro-switch.

Nov 17, 2009 | Kenmore 61652 Microwave Oven

1 Answer

Microwave stopped working when i pushed the start button
Yes. The white inside the glass that you are describing is a blown fuse. To find out what size fuse it is look around the base or top of the fuse. You will see engraved something like "125V 5A. You can pick these up at Home Depot or Lowes in the electrical isle. You can also type www.google.com and enter the word "fuse" and then the size it is. (125V 5A) If you have found this information at all helpfull, please rate my solution. Thanks D. Lange

Apr 23, 2009 | LG Microwave Ovens

1 Answer

My emerson microwave has stopped heating up but appears fine
Hi 

If your microwave oven doesn't seem to work at all, check these:

Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it.

Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work.


Please do rate the solution as "FixYa" if found useful and revert for further assistance.

Thanks
Rylee

Mar 31, 2009 | Emerson Microwave Ovens

1 Answer

Terminal connector to the door switch overheated & fuse blown
Just cleaning is not enought.The terminal is loose and that isusually the problem most of the time.Replace them with new ones and I think you be happy.

Mar 12, 2009 | Panasonic NN-P794SF Microwave Oven

2 Answers

Danby 1000 Watt Microwave is completely dead. Just stopped working right after heating up a dinner.
you may have just blown a fuse inside the microwave or the transformer inside has now failed and will need replacing but it will need to be looked at to see what exactly happened

electech

Nov 27, 2008 | Microwave Ovens

1 Answer

Neff combi blown diode.
If the diode failed by opening, there may be no other damage. If the dioded failed by shorting, the alternating current may have damaged other components. Ohm it out. You can get diodes from digikey.com, mouser.com, or radio shack or any electronics or appliance supply. If the diode is charred and you can't get the part number, the oven rating can be used to select a replacement. Since the fuse was 10 amps, the diode should also handle at least 10 amps. If you can power the unit and read the voltage at the diode input this will give you the power (volts times amps). It's always worth trying as it's cheaper than replacing the unit.

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