Question about Sharp Microwave Ovens

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I used my sharp R-1821 convection microwave that night it did not work. outlet is lit up but display does not come on. Why?

I live in an RV motorhome. my microwave worked in the morning then at night it didn't work. The display does not light up, and the plugin for the microwave is lit up nothing seems to be wrong there. I check fuses and breakers all good. Is there anything else I can check before I have to break down and buy a new one?

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More than likely it will be one of the three door switches. Also check the internal fuse in the unit. The fuse if blown is just a symptom, not the problem. It doesn't always blow out but the right combination of switches bad will take it out.

Posted on Dec 03, 2014

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Posted on Jan 02, 2017

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Sharp Carousel Microwave Mdl 1875 for our RV is dead


>> We also tried plugging our toaster into the microwave plug outlet, and the toaster wouldn't work in that outlet, but worked just fine in a different outlet in the RV.

This means the outlet you plug your microwave into needs to be fixed in addition to fixing the oven. Breaker? Fuse?

>> I understand from another RV forum that microwave ovens for RVs have "special circuitry and cooling features" not found in regular countertop ovens for household use.

Not really in my experience. Any microwave supplied with clean AC power and proper venting space will be fine.

But I'd bet your microwave can be fixed affordably.

The main internal things which can result in this model being dead (no display, no light when you open the door, no beep when you press a pad on the keypad) would be the 20A fuse and the magnetron temperature fuse. There could also be bad connections on the noise filter board.

Also, sometimes a power surge can cause the power to be interrupted to the low voltage transformer on the board, and I regularly repair those boards. I can also write a technical statement to your insurance company or to an RV park as needed.

At my Web site, I have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

The relevant service manuals for this model are here and here.

You can order Sharp parts from Sears or Encompass.

Contact me directly if you need more help.

- William E. Miller, AS-EET
pupista@gmail.com
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide "Recycling by repairing since 1982"

Mar 08, 2017 | Sharp R1875: Over the Range Convection...

1 Answer

Sharp R-1870F Microwave Won't turn on


Could be just a fuse but probably the diode pack or magnetron.

May 24, 2017 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Intermitten power loss


what kind of motorhome is it if it has a inverter it may be kicking in and out due to low voltage or a bad cell in the batteries

Feb 08, 2012 | Sharp R-1850A Convection/Microwave Oven

1 Answer

Looking for a printable/downloadable owners manual


Go to managemylife.com and type in the model number you provided under the "Manuals" link. Your owner's manual is available in a .pdf (Adobe) format that you can download or print for FREE. I hope this helps you.

Mar 02, 2010 | Microwave Ovens

3 Answers

Built-in Sharp Carousel II Microwave Convection Oven died.


There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.

Another possibility is that the control circuit board in the oven may have failed. I have worked on several Sharp ovens where the power transformer for the board has gone bad for no good reason. If the board goes bad the oven may appear to be dead as well.

Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.

Hope this has helped a little. Thanks for using Fixya!

Feb 02, 2010 | Sharp R-1874 Convection/Microwave Oven

1 Answer

I need a manual for Sharp Microwave/ Convection R7A85


You can download that here free.

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

Aug 30, 2009 | Sharp R-7A85 Microwave Oven

1 Answer

Ceiling plate cover has small hole; otherwise works fine.


Since your waveguide cover is burned, it will need to be replaced. It provides important protection for the magnetron.

It is part # PCOVPA180WRP0 (copy & paste) and you can
order it from Encompass here or you can call them toll-free at 866-779-5835.

In some cases the part is held in place with a rivet. Other times it just slides out of the slot.

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

May 24, 2009 | Sharp R-1870 Convection/Microwave Oven

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