Question about Sharp R-1850A Convection/Microwave Oven

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I have a Sharp R-1850A and the microwave does not work. The convection works along with all the lights and controls. I have had the problem fixed once before by an rv dealer but the problem seems intermitten.

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Is there any unusual noise or is it louder than normal?

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

The service manual is here:
http://www.microwavedisplay.com/r1850_r1851_sm.pdf

You can order parts from Encompass here or you can call them toll-free at 866-779-5835.


Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


http://www.gallawa.com/microtech/xformer.html

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

Posted on Sep 08, 2010

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Power is on, timers,etc. work, but heating and interior light do not work.


Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101 ;'

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May 13, 2011 | Sharp R-1850A Convection/Microwave Oven

1 Answer

Microwave doesnt work but convection works can this be fixed


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Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

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Jan 04, 2011 | Sharp R-1850A Convection/Microwave Oven

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I hqave a Sharp convection/microwave I bought in 1980. I love it but the microwave has stopped working anyone have any ideas as what to do. Thanks, Vicki


it could be the magnatron or the high voltage fuse, they are the common problems of a microwave not heating. ALWAYS GET A QUALIFIED TECHNICIAN OR SOMEONE WHO KNOWS HOW TO DISCHARGE A HIGHVOLTAGE CAPACITOR BEFORE ANYTHING INSIDE A MICROWAVE IS TOUCHED, ALWAYS UNPLUG FROM WALL ALSO!!!!

Nov 26, 2008 | Sharp R-1850A Convection/Microwave Oven

1 Answer

Clicking noise of fan on convection


The motor on the fan has to be replaced.The fan is hitting the screen .Hopfully that will fix it .Thank you .

Nov 05, 2008 | Sharp R-1850A Convection/Microwave Oven

1 Answer

Cooking in an old convectional microwave


Regardless of the model, the basic procedure should be the same in most Sharp convection models.

You can download several recent models here:

http://www.sharpusa.com/products/TypeManuals/0,1083,5,00.html

Nov 22, 2007 | Sharp R-1850A Convection/Microwave Oven

1 Answer

Sharp 1850 microwave


The most likely sources of the funny sound would be the high-voltage diode, transformer or the magnetron.

 

It's possible that the high-voltage capacitor shorted and blew the fuse.

 

It will take some troubleshooting.

 

At our site, we have critical safety information, and disassembly information.

 

See our listing here on FixYa: http://tinyurl.com/yzjozk

Oct 20, 2007 | Sharp R-1850A Convection/Microwave Oven

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