Question about Sharp R-303CW Convection / Microwave Oven

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How to fix Sharp Carousel Microwave Oven R-303CW clock not working?

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The clock is part of the control board and cannot be repaired as a separate item. Most replacement control boards costs as much as
a new microwave.

Posted on Jul 19, 2014

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6ya6ya

6ya staff

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SOURCE:

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Posted on Jan 02, 2017

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MicrowaveSvc

William Miller

  • 9179 Answers

SOURCE: R-4H84 Sharp Carousel II microwave oven stoped working

A microwave can be dead for many reasons.

The fuse is normally located on the floor of the chassis behind the control panel or between the door switches.

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

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

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 goes dead or blows the breaker when you plug it in or open or close 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: http://tinyurl.com/yzjozk

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

Posted on Jun 23, 2008

mcdevito75

Michael C. De Vito

  • 1970 Answers

SOURCE: User Manual Needed for Sharp Carousel Microwave Model R-303CW

mcdevito75 here, Best Bet, contact Sharp online, try sharp microwave oven.com Or in any store that sells Sharp microwave ovens get contact info off that package.

Posted on Jul 07, 2010

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My sharp 1214 won't heat anything. power is good - timer and clock are fine. stopped working in the middle of heating something. we use often. carousel is not rotating anymore either.


Hi,


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

Basic Microwave Oven Troubleshooting Tips

heatman101


,/,/,/,/,/,/,/,/,/

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User Manual Needed for Sharp Carousel Microwave Model R-303CW


mcdevito75 here, Best Bet, contact Sharp online, try sharp microwave oven.com Or in any store that sells Sharp microwave ovens get contact info off that package.

Jul 07, 2010 | Sharp R-303CW 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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Need replace tray for turntable R-303cw sharp


Cheapest here:
http://shop.ebay.com/?_from=R40&_trksid=p3984.m38.l1313&_nkw=NTNT-A079WRE0&_sacat=See-All-Categories
Eric

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The display no longer works on my Model R303CW Sharp Microwave. Is there a part that will fix the display?? Everything else works fine.


Nope , could be dry joints or corroded pcb or defective display driver or supply ? Only can be told once opened and inspected.

May 13, 2009 | Sharp R-303CW Convection / Microwave Oven

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Sharp Carousel Microwave Model R520-LK timer will run but carousel doesn't turn and food doesn't heat.


I also have the Sharp Carosoul oven, symptoms - fan runs, controls are fine but the turntable stopped turning and it did not heat. It was not the switches, fuse, but in fact a sagging door that misaligned with the door switches. The true cause was a warn top hinge. As a temporary fix, I adjusted the bottom hinge (3 screws underneath), straightened the door, and now it works again.

Dec 16, 2008 | Sharp Microwave Ovens

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