I need a microwave wave guild cover

not until you have it checked out in a repair shop.
using a microwave oven where it is possible that the microwave generated by the magnatron can escape to outside, means that any person in the vicinity of the unit can suffer radiation burns and /or get cancer if allowed to be exposed a simple check is all that is necessary

Microwaves use a magnetron to generate microwave energy and direct it a rotating blade wheel to spread them around the inside of the oven. If there is any metal in the area to be heated, or any of the blades are bent, even a bit, the microwave energy can be reflected back up to the magnetron area. In this area there is now too much power and it sparks away, so it does not heat the item in the oven.
Because it is sparking it is now a safety hazard the sparks may melt and set fire to plastic parts in it. This is serious it could burn your house down. Bin this microwave and cut the cable off it to make sure no one else ever uses it.

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

Click on replacing waveguides: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Your wave guide cover and magnitron need to be replaced.

A dirty or damaged wave guide cover can cause sparks, fire and noises. You can order a replacement wave guide cover from many appliance parts websites for less than $15 in many cases. It should fix the problem.

look for dirt inside the cavity or the wave guide cover it's arcing... make sure you have something in the microwave, don't run it empty

Hi,

Do you mean "sparks" inside the oven cavity when it is operating ?

If so, check for grease spots on the wave guide cover or scratches on the oven liner. Scratches can be touched up with touch up paint and wave guide cover`s can be replaced.

Hope that help`s, good luck.

macmarkus :)

YOU SHOULD NOT RUN MICRO WITHOUT ANY THING IN IT / THIS WILL OVER LOAD THE MAG TUBE . AND SOME TIMES FRY IT .. The sparking and arcing is probably a bad wave guide . this is sometimes caused by food splater / it gets in the cracks and corners and then cooks till it truns to carbon which conduts the micro's and thus arching .. clean it good and touch up any burns in the metal and repl wave guide cover. mm hope this will help .. mm

in the top of unit is a round cover and damage is coming from here. This is serious and needs to be checked out. the cover contains a stirrer that moves waves around<<circulates them>> in this cavity probably paint is thin and allowing waves to penetrate metal of cabinet. Call manufacturer and see if there is anything they will do for you before taking it upon yourself to either get repairman or get rid of unit.stirrer is probably damaged and cabinet burned from waves.

Hi There!
Check behind the "Wave Guide Cover" on the inside cavity. There may be moisture or food residue behind it. Should be a cover that is plastic or Mica. Really strange that it's sparking being new. Also check that you use plates without gold or silver trimmings (Crockery or porcelein). This will also cause sparking. Remember that microwaves will always go to the first organic source in its path. The wave guide cover, if soiled, is very close to the tip of the Magnetron and will therefor result in arcing. Good Luck, JUS004