How do I get the actual part no. for a Sharp carousel microwave model no. R-510HK

Changing the light bulb on your Sharp carousel microwave will allow you to have needed light inside the oven. Microwaves are not designed for consumers to change the light bulb due to manufacturer liability, but it can be done. Following the proper steps will ensure a successful installation. Step 1 Unplug the Sharp carousel microwave from the electrical outlet.
Step 2 Locate the screws around the outer cover of the Sharp carousel microwave and unscrew all the screws.
Step 3 Lift off the covering.
Step 4 Locate the bulb and unscrew. Screw in your new bulb.
Step 5 Replace the cover and screw back tightly. Once done, test your new bulb.

parts house or get a piece of mica and cut you own...easy

Not sure if you will be able to order from this place or not, but here is an option for you.
http://www.repairclinic.com/Shop-For-Parts/a6b113c51/Sharp-Microwave-Magnetron-Parts

Hi,
Actually you don't need to replace the microwave, you just need to replace the carboard piece or "wave guide" and replace the magnetron inside the microwave behind the cardboard piece. The magnetron will commonly arc out to the wave guide if the wave guide gets something that splatters on it. The repair isn't cheap because the magnetron costs about $200 and the wave guide is another $30 or so, but if you replace both these parts you should be good to go again.
The magnetron usually have 5 years warranty, however you need to speak with manufacturer itself for the same.
Let me know,if needed further assistance.
Hope i helped you.
Thanks for using ' Fixya ' and have a nice day!!

That is most likely caused by a failing wave guide cover. It is situated in the cavity and protects the magnetron.
Most dealers keep or can easily get them.
Hope that helps.

It is known as the Wave Guide Cover. It is actually very important, stopping the contamination from the cooking food/liquids entering the magnetron and damaging it.
It should be available via an appliance repair dealer.

You have to replace that small screen which is called wave guide. If there is a sharp authorised service centre near to your place you can buy the part from them. Do not work the oven without replacing that part.

You probably have a defective magnetron or blown fuse supply power to magnetron.

MODEL NUMBER NEEDED

Apparently this is not actually an R-510HK since that model does not have convection mode. Can you reply back with the correct model number? We may have the service manual for you.

A PRELIMINARY OPINION

It sounds like you have loose door switch mounts or possibly loose door hinges.

If the door won't open via the door open button, then the outer cover will have to be removed.

BEFORE YOU RATE THIS

This is a preliminary post, asking for further information (model). Please withhold your rating until we actually offer the solution.

Meezy, that plate is called a "wave guide cover" and it's shorted out for a reason, (the part number is WB06X10541 and it appears to be a Factory order part). The reason it's shorted is probably due to a failed magnetron, the component used to create the microwaves. The magnetron carries a 10 year warranty from GE. Call 1-800-GECARES for a warranty repair. You'll need the complete model and serial numbers... they are on a sticker inside the microwave. Hope this helps!