Question about Sharp Microwave Ovens

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Magnetron tube and mica waveguide cover

I need a rough estimate of cost to replace tube and mica cover. parts, labor and service. the microwave is only 1.5 years old.

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  • kristinbickh Nov 26, 2008

    That's what I figured. Thanks!



1 Answer

Unfortunatey unless the unit is a high end oven by the time you pay for the parts and labor you could probably get a new one. Don't forget if you have to replace these parts already who knows what else is about to happen. I hope this helps you out.

Posted on Nov 26, 2008


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In manual page EN-8 It says "Do not remove the light brown Mica cover that is attached to the oven cavity to protect the magnetron. What is a magnetron and what mica cover are they talking about

The Magnetron is the high-power device that produces the microwave energy that is directed into the microwave oven cavity by means of a waveguide, which is a metal boxlike duct that transmits the microwave energy from the magnetron to the oven cavity. The Mica cover is a microwave-transparent film that covers the open end of the waveguide where it enters the oven cavity. It is there to prevent dust, dirt, and other things from getting into the waveguide. If that happens, the waveguide can develop electrical arcing, which will destroy it and the magnetron.

Dec 16, 2015 | In Microwave Ovens

2 Answers

Is the mica cover crucial?

sad to say but YES it is critical . .

Mar 25, 2015 | In Microwave Ovens

1 Answer

There is a pad on the interior right side that is made out of cardboard type of material. Seems very flimsy. Does this stay in there? What is its purpose?

That piece is called the waveguide cover. In many ovens it's made of plastic. In others, like yours, it's a mica sheet and does seem rather like cardboard, and is brittle. It's there to cover the hole where the microwaves enter the cooking cavity, so no food particles or grease can get in. The oven can work without the cover, but it's potentially unsafe. Arcing and overheating can result, and the magnetron tube (the microwave source) can be damaged, if food buildup occurs in the waveguide.

Replacement waveguide covers are available for many models, and you can get pieces to make your own if you can't find the exact part. Search the Web for "<your make and model here> waveguide cover". Sears parts and Appliance Parts Pros are good places to start looking, and you may be able to find a suitable replacement if you have an appliance parts store in your area.

Sep 10, 2011 | Microwave Ovens

1 Answer

Sparking when heating the food.what could be the problem.

More than likely the waveguide cover is the culprit as I suspect you have checked the obvious.
REplacement of this cover is critical to the health of the magnetron.
It is made of Mica and should not cost much to replace.
I hope that answers your question.

Feb 28, 2011 | Magic Chef MCD1311ST Microwave Oven

1 Answer

No heat in microwave. Makes loud humming sound when turn on. Model GE Spacemaker JVM166OWBC 04

The humming can be caused by a couple of bad parts. Usually it's the magnetron tube, the microwave source. They often fail by shorting out, and the loud hum from the power supply is what you hear. Another part called the HV diode may also have shorted, but the magnetron is more common.

A bad magnetron can be replaced, but it's a costly part. And microwave service should be left to a professional, because there are dangerous voltages under the cover and a chance of microwave leakage if repairs aren't done correctly. Between the part and labor costs, it might be more economical to replace the oven. Let a qualified servicer give you a repair estimate and then decide.

Jan 09, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

My Goldstar MA 781M microwave has a "mica" like

That sheet is called the Waveguide Cover and its function is to stop debris and food entering the aerial and magnetron.
Replacement is essential and must be made of mica.
It can be purchased from a dealer at a reasonable cost.
Google the manufacturer and find a dealer.
Hope that helps.

Nov 06, 2010 | Goldstar MA-7801 Microwave Oven

1 Answer

How do I install a waveguide in a Sharp microwave oven? The old one burned through because of corrosion beneath it. I sanded it & repainted with rust preventative paint. I don't want to break it during...

If you mean the waveguide cover, those are almost always mica or plastic.

They would normally install by sliding them into slots in the cavity or ceiling, and sometimes they are held in pl;ace with a plastic rivet, too.

If a waveguide cover is damaged, it should be replaced with a new one, not repaired in any way.

Arcing will occur, which can damage your magnetron, waveguide, and / or chassis.

If you mean the waveguide itself, which channels the microwave energy from the magnetron to the cooking cavity, that cannot be removed or replaced. They are welded in place. If the waveguide is bad, the oven has to be replaced.

We have quite a few Sharp service manuals which cover disassembly and parts lists, etc. If we have it, I can point you to a link to download it free.

Feel free to contact me directly with your model number.

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

William E. Miller

May 25, 2010 | Sharp Microwave Ovens

1 Answer

Microwave Magnetron tube has arced


Feb 08, 2009 | LG Microwave Ovens

1 Answer

Takes much longer now to heat things

I think you have two separate problems.

Taking a long time to heat is almost always a failing magnetron.

The cover on the side is the waveguide cover. If your waveguide cover is burned or broken, it will need to be replaced.

It protects the waveguide and magnetron from grewase and food particles, which can cause arcing and damage.

Hopefully your oven is just under the one-year mark and GE will fix it free under warranty.

Otherwise, they will replace the magnetron at no part cost, but labor will be your responsibility.

GE Customer Service is at

We're happy to help and we appreciate your thoughtful rating of our answer.

May 10, 2008 | GE Advantium 120 Convection/Microwave Oven

1 Answer

Waveguide cover for Kenmore microwave

Try replacing the screws with larger ones. Maybe you ordered the wrong piece, if your microwave comes with a mica cover (A fine, square piece of mica) and you received a plastic one, you will need to get the right piece or adapt the one you received.
You can get the mica cover on any microwave service.

Feb 16, 2008 | Microwave Ovens

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