Inside the Microwave, there is a Gray silver plate fixed on side wall. This plate got burn. Can I find a replacement to it in New Zealand

see this indication and fix it. God bless you

1. Waveguide coverSparking and arcing in a microwave can be caused by a damaged waveguide cover. Try removing the waveguide cover to see if the problem persists. Once removed, the waveguide cover can be inspected for burns, which will indicate if this is the issue. If the waveguide cover is burnt or will not stay in the proper spot it will need to be replaced.
   
2. Cavity/Rack supportIf sparking or arcing in your microwave is near a rack support, any exposed metallic area can be covered with a microwave cavity support. It is also recommended to replace the rack supports in this situation to ensure the issue is resolved.
   
3. Cavity paintIf sparking or arcing in the microwave is visible on the side walls, the paint covering the metallic areas could have worn off or chipped. This can possibly cause pitting in the side walls or ceiling. If this is the case, it can be repaired with microwave cavity pain
   

This arcing is caused by food splatter when something 'popped' or 'exploded' during an earlier cooking cycle. The food particle remained and every time the microwave gets used, this particle continues to cook until it turns into carbon. This can be as small as the tip of a pin. Carbon reacts very violently to RF energy (which is what causes the food to heat). You need to carefully remove the "waveguide cover". Clean it and check for a burned spot. You also need to inspect the inside of the "waveguide" once the cover is off. Clean it also. Make sure there is no grease or other foreign matter inside there and be sure not to leave anything in there (paper towel piece, etc..). If any of the paint inside the waveguide is burned, and if it can't be sanded off and touched up with catalytic paint, you need a new microwave oven. If the burned area is limited to the waveguide cover and you can't find a replacement, you can buy a sheet of mica material from a parts house and use the old cover as a template to make a new one. Also, "If you are on Gilligan's Island" and can't get any new material, you can cut the burned spot out and cover the hole on both sides of the waveguide cover with cellophane tape. Do this at your own risk but usually it works fine.......

Presuming that you have iliminated the possibility of any metal objects that are not meant to be in the machine being in there (and this includes dishes and other items with silver or gold leaf on them, which WILL spark and burn!) then take a look inside the oven its self. You will find a waveguide cover. It is usually a strange flakey silvery plastic/card like material called Mica and is usually on the same side of the microwave wall as the control panel (So if the picture on this thread is accurate, I will guess the Mica cover is on the right hand wall inside as you look at the machine from the front) . Over time, the magnatron (the thing that creates the microwave energy) will often burn a hole through the mika, or cause a dark brown or black burn mark in it. If this cover is even slightly damaged then it may well cause sparking inside the machine. These covers are designed to be removed and you can buy replacements for them from electrical stores.

Hi

To locate the inlet cover, look towards the interior side of the microwave next to the microwave display. The inlet is typically located near the back of the microwave, in the middle of the wall.
Unplug your microwave from the electrical outlet and remove any food or containers.

Wipe the inlet cover, typically located on the right side of the microwave in the middle of the wall, with a damp cloth. The cover must be kept clean or it will not protect the microwave.

Dry the inlet cover with a soft towel.

Leave the microwave door open for several hours to air out the inlet cover.

Examine the inlet cover for wear and tear. If the cover has too much damage in the form of scratches or holes, it may need replacement.

Remove the inlet cover, if desired. Insert a putty knife under the plastic nail that holds the inlet cover in place. Pry out the nails and set them aside. Pull out the micro plate in front of the inlet and set it aside. Remove the inlet plate.

Install a new inlet plate. Slide the new inlet cover into its place. Replace the nails back into the side of the microwave by aligning them with the holes of the side.

Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting fixya.com

That's the waveguide cover whichcovers the opening where the microwaves enter the cooking cavity. What happens is food spatters (especially grease and sugar) on the cover absorb the microwaves and cause the spots to heat, so the cover gets burned. The oven will actually operate without the cover, but it's needed to protect the antenna of the magnetron tube (the microwave source). If food gets back there and burns, it's usually doomsday for the tube and time for a new oven.

The replacement is GE part number WB06X10591. It's available from these folks. I do a lot of business with them, so I can recommend them. Here's another source that has it at a lower price, but I don't know anything about the company. You can also try calling appliance parts places or repair shops and give them the number; they may already have the part in stock.

yes you can buy a sheet and cut it to size-just ensure that any bare metal inside the microwave caused by the sparking isrubbed down and painted with two coats of ,hammerite metal paint otherwise its back to square one

The loud noise is probably the magnetron makign the noise. The charred areas on the wall are from possible grease or food particles arching and burning the cavity. Alot of times there is a cover on the wall it burns. it would need to be replaced, as well as sand and paint the cavity area that is damaged with m/w grade paint.

The plate MIGHT cover the waveguide that brings the microwave energy into the cooking cavity, This might be say an inch by two or three inches.

IF the plate has burned or discolored, then it may be carbonized and will continue to absorb the microwave energy and MAY cach fire.

You should service the unit and replace the part.

Running the microwave with too small a load in it can cause this and also if hot food/object touches the plate.

http://www.repairclinic.com/Appliance-Parts?s=t-+R-209KK+-%3d%3d&n=2

The magnetron tube which makes the microwaves is behind that cover plate, and it has gone bad. It is a replaceable part, but it's not worth the cost. Part and labor would be more than a new oven. It's time to treat yourself to a new oven.