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Sparks when turned on from indide right hand side

Whenever I turn on Microvave electrical sprks from right hand side steel bit. tried to remove it and it worked but why wont it work with steel bit on as too dangerous without it

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Well, I've had this problem before, the cause of the problem was grease, dirt, and food grime stuck between the magnetron and the plate. When I mean stuck I don't mean a glob or chunk it was a layer. So my advice to you is to take it apart, clean it up and put it back together. Be Careful Make sure nothing obstructs inside and outside, it must be sealed or you will get radiation going through you and you might be killed. SO MAKE SURE, you might even want to get it tested for radiation leak when your finished.

I hope this helps you out some

Posted on Apr 02, 2008

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Actually, that's a feature! If you cook much on the range (stove) beneath the microwave, the heat will cause the microwave bottom to heat up quite a bit (just touch it!), and the microwave will turn on it's exhaust fan in an attempt to save itself from burning up. It will shut off in about 15 minutes after you turn off the source of heat.
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Microwave when turn on making a noise and sparks comin from fan area?


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Waveguide Cover




If the microwave is sparking or arcing the waveguide cover might be damaged and shorting out. Try removing the waveguide cover and see if the problem goes away. If there are any damaged spots in the microwave ceiling or sidewalls, repair them and paint them with microwave oven paint. Replace the waveguide cover if it is burnt or if it will not stay in place.

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If the microwave is sparking or arcing on the side walls the paint might have chipped causing pitting in the metal oven wall. Use microwave safe paint to touch up any bare metal spots.

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If the microwave is sparking or arcing near one of the rack supports, remove the support, repaint any bare metal, install a new support.

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If there is spark please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is leaking and sparking to the ground. As you have mentioned it was stored, it is quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Now switch the microwave power on and use a cup of water to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. Replace with same type. If not check the waveguides within the cabin for food particles that can burn and spark, check for rust that can corrode and spark when the ceramic paint has worn out.
If there is heating without any issues, you can use the microwave safely

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Top left burner (propane) does not seem to be receiving gas when trying to ignite it with electrical igniter (control knob). However the burner can be lit with a match when the control knob is turned past...


The igniter usually sparks for all burners on the stove at the same time. Usually a little water or gravy, or such has gotten on the little spike that stick up and throws the spark to the burner. If you will take a small brush, like a tooth brush and carefully clean around the little spike it normally starts sparking again. As it is right now, you should be able to see the spark on all the burners whenever you start any of the burners. Check to see on the one that is not lighting, I think you will find that it is not sparking at all right now.

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The Magnetron has failed, causing the waveguide to become damaged. If the waveguide is damaged/burned the microwave can not be repaired and should be replaced.

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Hi all,

I have just replaced the bulb in my Panasonic NNA873 Dimension 4.

Please be careful,although it was an easy job, there is a capacitor inside which stores heavy loads of power and will release the electricity into you if you touch it!

YOU CANNOT REPLACE THE BULB FROM INSIDE THE MICROWAVE....... DO NOT REMOVE THE CARDBOARD-STYLE COVERING WHICH IS ATTACHED WITH ONE SCREW INSIDE THE MICROWAVE ON THE RIGHT.

To replace bulb will take 5 minutes.

UNPLUG microwave. Remove the outer cover by unscrewing about 6 screws (ordinary phillips) don't lose them into the workings.......

Bulb is located on the right side, nearer to the front. You cannot see the glass of the bulb, only the black plastic end piece, as the bulb sits upside down and vertically. Best if you check out what a T170 looks like on the internet, then you will know what you are looking for. For my Panasonic I needed a T170 (but be careful, they have different ends, some are straight, some right angled - mine was right angled - check before you buy and no, I don't think you can get them from any ordinary supermarket etc!!). Do not touch the bulb when replacing as the oil on your fingers will shorten its life.

Old bulb can be removed by taking out one screw and then pulling off the connectors - there is a little tab to push down to ease them off.

Then simply replace bulb!

When putting cover back on make sure all the tabs on top and sides go inside not outside casing.

Good luck. This is an easy job, just don't poke around anywhere else.

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The cover is probably the magenetron. That is where the microwaves come from. If the bread was moist, it might have left condensate in the unit which is causing the sparking. Unplug the unit, leave the door open over night. If you can remove that cover, do so. Be sure to carefully replace it before using the unit. Never turn on a microwave with nothing in it.

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