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Sharp Microwave Model R-1830: No power

Our microwave died suddenly. No Lamps or power indication at all. Power to the electrical outlet it is plugged into is good. Is there any internal fuse or circuit breaker that I can check before paying for a service call?

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  • daveolson Jan 21, 2009

    tripped a breaker in my motorhome, and when I reset, the microwave is dead. is there a way to get to the fuse without removing the microwave from the coach? where can I get a wiring diagram for the R1830?

  • Anonymous Jan 31, 2009

    Sharp Micro model R408JW made in April 2004.  Circuit is fine, Micro is deader than a doorknob.  Is there an internal circuit breaker to reset.  

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  • Microwave Ovens Master
  • 8,820 Answers

A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open oven thermal cutout (TCO) on the top of the oven cavity / body or an open thermal fuse on or above the magnetron.

These should read closed (virtually zero) on a continuity check.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it went dead or when you plugged it in or opened or closed the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can usually find exploded views and order parts by entering your model number here at the Sears parts site but the best place to order Sharp parts is Tritronics.

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

Posted on Oct 13, 2008

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I have a Sharp Carousel model R-1874-T. It suddenly stopped working. No lights are on. I checked the outlet and there is power coming there. Is there a way to reset the microwave?


Steve,
You probably have a blown fuse.

Unplug your microwave and turn it around and remove the screws holding cover on and then remove the cover. Look for where the power cord goes into the back of the unit and follow the black wire from the cord to where it ends. It should stop an either a circuit board or a fuse holder. Make sure that you replace the fuse with the same amperage fuse as what you take out. You will find the amp rating stamped on one of the silver collars on each end of the fuse. Good luck!

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There probably is a fuse inside but replacement depends upon your degree of comfort with disassembly while maintaining awareness of the dangerous voltages lurking inside.

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No power everything was fine then nothing when i got home is there any fuses to check in the microwave


There is a fuse under the cover, as well as a couple of safety thermostats that can cause a dead oven. It may also be that the power transformer for the control circuit board has failed. I've seen several Sharp ovens where the transformer died because of power surges. This would cause no display and no functions even though the oven has power. Also, did you make sure the outlet your oven is plugged into has power? If it's a GFI outlet it may need to be reset, or a circuit breaker in your electric service panel may have tripped.

Hope this helps, and thanks for using Fixya!

Feb 28, 2010 | Sharp R-1850A Convection/Microwave Oven

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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!

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Sharp microwave suddenly died !


The high voltage transformer that feed the klystron tube usually has a cartridge fuse on its 110 v side.

YOu will have to remove the case to access the electronics... the screw should be obvious...

Note.. you are handy- so the obvious (unplug first) and the even more obvious - keep fingers and metal away from all capacitors in the power supply area.

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Our Emerson microwave died and I bought a new one. Plugged it into the same socket and it immediately shorted out and died. After the new microwave died I plugged a blender into the same receptacle and it...


I believe you have a bad circuit breaker or fuse. If you have a delay fuse contrilling this circuit, that would explain the spotty availability of power to the outlet. Also, a faulty circuit breaker can operate in an irregular way, as you describe.
A microwave oven requires a lot of power, relatively speaking. If your microwave is a 1200 watt model, for example it draws 12 amps of power, which could well be almost all of the power available at that outlet, providing that other appliances were not also drawing power from that circuit at the same time.
I can assist you further, but if this information is all you need to proceed that is fine too. Get back if you need more assistance.

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1 Answer

Just suddenly died while warming up my corn


If the unit has never had the fuse replaced I would say start here. Thats a long time on a fuse. if you need help replacing it let me know. DFD

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