Question about Magic Chef MCD990W Microwave Oven

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I inadvertantly ran 220 to my RV. the main breaker tripped sparing the power coverter and everything but the microwave. i removed the cover on the microwave and replaced the 15 amp ceramic fuse but still no luck. what should i try next or is it a lost cause

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Probably lost; the main board is likely fried.

Posted on Aug 30, 2010

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Unit has no power nor is display lit up. Have power to cord. tripped breaker. is there an internal fuse behind control panel


Microwave ovens have an internal fuse to protect the unit. Once you remove the white cover it is easily located on a board where the main power cable first goes into. Despite what you hear about dangerous radiation generated by microwave it is sage to turn on the microwave with the white cover off because the radiation stays within the microwave cavity. If you buy pass the door interlock then you may be exposed to some radiation escaping from the door opening. No match can go wrong in a microwave. Usually its something simple like a bad connection a burned fuse .or a burned power supply if it is microprocessor based unit.

Mar 05, 2015 | Microwave Ovens

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I see other people talking about getting error codes on their Kenmore microwave. How do you get these codes my unit stopped working completley and the display is blank. I have been told to look into the...


Scott, if everything has gone blank on your microwave and you have no lights when you open the door, it may be the main fuse or even a tripped circuit breaker. Plug something else into the outlet to make sure that the circuit breaker is not tripped. If that is okay, un-plug your microwave and take out the screws that hold the outside cover onto the microwave and then remove the cover. Look for where the power cord goes into the unit and follow the black wire from the cord. It should go to either a small circuit board with the fuse located on it, or it may go to an in-line fuse holder. If you have access to a multi-meter, you can set it for continuity and check your fuse after you remove it from it's holder. If it is bad it will not show continuity. Replace it with the same amperage fuse that you take out. It will be stamped on one end of the fuse and will usually be either 15 amps or 20 amps. Hope this helps!

Feb 06, 2015 | Kenmore Microwave Ovens

1 Answer

Hi I have a Samsung SMH9187 micowave that is dead (no display, light, fan, mirowave).


Sounds like the main fuse blew. It's either near where the power cord enters the cabinet, or behind the control panel (if an over the range unit).

You may also have some type of failure in the high voltage circuit; based on your description of the symptoms.

Aug 16, 2014 | Samsung SMH9187ST Microwave Oven

1 Answer

Breaker trips when using microwave. Electrician can't find electrical problem. Could it be the microwave itself?


Answered earlier, another tips is to disconnect the power to the board and see if the circuit breaker holds, if not check the main line circuit.

Jan 31, 2013 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

It just has no power. Nothing happened, I just went to use it and it was dead.


The main fuse is blown, "ceramic type" usually caused by a defective door switch.

Apr 14, 2011 | Maytag MMV4205 Microwave Oven

1 Answer

I have a 20 year old GE JCM140H over the range microwave which has always worked just fine. Last week everything just "died" no lights, no fan, no display, no microwave. I thought that I had...


You'll have to remove the cabinet cover to access the fuse. It is in line with the power cord. 20 Amp, slow blow.

One of the screws on the back of the cover may be a security TORX (the kind with a pin in the center of the head). Usually, if you tap on it with a hammer, you can remove it with a pair ov Vise-Grip pliers.

Jan 05, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Blowing main breaker


I have a hard time believing that the home's main breaker is tripping instead of the branch circuit breaker that feeds the microwave. I suspect it is really just a difference in terms. You should disconnect it and try using in another outlet - preferably one on a different circuit if possible. If the breaker continues to trip; this appliance should be disconnected and either be discarded, repaired or replaced before using again.

If the microwave works as expected (on a different circuit), it may indicate the original circuit is overloaded. Microwave overs are supposed to be installed on a dedicated circuit. This means only one outlet is on the circuit - no other loads (lights, appliances, etc.) are permitted on this circuit. A microwave typically requires 10 Amps or more when on "high" and will require a significant portion of the power supplied by a 15 or 20 amp circuit breaker. There is little unused to power much of anything else. If other appliances go out when the microwave trips the circuit breaker, you should contact an electrician to have a dedicated outlet installed for the microwave.

I hope this helps!

Sep 23, 2010 | Maytag Microwave Ovens

1 Answer

This oven is fitted to my new (to me) rv. the convection bit is fine, but the microwave trips the 15A breaker. have changed the breaker, still trips.


Yes the breaker is to stop firs etc, you should NEVER EVER simply re-set a breaker without finding out WHY it tripped. I suspect your oven has developed a Short Circuit fault. Please DO NOT touch it while plugged in you risk electric shock. Please remove from power and get it looked at by a qualified person. Please ask for "Quote" before proceeding with any work. a lot of the time replacement is cheaper than repair.

Mar 19, 2010 | Sharp R-1874 Convection/Microwave Oven

1 Answer

MAYTAGE MICROWAVE MMV5100AAB-SWITCHING BREAKER WHEN STARTING


is there a way to over ride the main board start button so i will know if the board is bad. or away to test this?.

Oct 29, 2008 | Maytag MMV5207A Microwave Oven

1 Answer

Sharp R-1850A Mocrowave Convection - No power


Chances are if the internal fuse and magnetron thermostat are good, then you have a circuit board that needs repair.

You can probably find exploded views at the Sears parts site. If you find a bad thermostat, the best place to order Sharp parts is Tritronics.

We regularly repair these control panels for customers nationwide (RV owners & dealers, too) with our guaranteed $39.95 service.

Feel free to contact me directly for more information & help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Aug 18, 2008 | Sharp R-1850A Convection/Microwave Oven

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