Question about Sharp R-1490 Microwave Oven

2 Answers

R-4H84 Sharp Carousel II microwave oven stoped working

My R-4H84 Sharp Carousel II microwave oven stopped working. Does it have a fuse to replace?

Posted by on

  • 2 more comments 
  • Anonymous Mar 13, 2014

    what is the size

  • Anonymous Mar 13, 2014

    how to use the 50% wattage?

  • Anonymous Mar 23, 2014

    I've changed the fuse twice in two minutes what else could it be?

  • Anonymous Mar 23, 2014

    My 1090 circa Sharp Carousel II built-in microwave just stop working. Is there a fuse? I checked the circuit breakers all good, everything else looks ok. Just lights out, no display , etc

×

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Sharp Master
  • 8,820 Answers

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

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 11 Answers

Yes it has a fuse. I have replaced mine several times. Unplug it and carefully remove screws from back and sides.The fuse is located behind the wiring on the right side near the control buttons about 6-8 inches back. The fuse can be purchased at Radio Shack and make sure it's white ceramic. It's only $2-3.00. Part #270-1041, 20 Amp, 250 Volt Fast-Acting. Try not to handle the fuse due to oils in your hands. Touch it at the metal ends. Make sure when you replace the cover that you put it back correctly.

Posted on Oct 09, 2010

  • Teola Brown Jul 30, 2013

    Yes you have been helpful. Thank You

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My micro wave stop heating food, every thing dislay work fine. when start it make loud sound. Sharp carousel II, model = R-3A54, Manufacture jan,1993


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

Microwave Oven Basic Troubleshooting Tips

heatman101
;;'

'';

Jul 27, 2011 | Maytag MMC5000 Microwave Oven

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

Does model, R 4A94 sharp carousel microwave oven have reset butto


I don't know of a reset button but there is a fuse that you have to remove the outer cover to get to that has a habit of blowing

Oct 14, 2009 | Sharp Microwave Ovens

1 Answer

Sharp microwave stopped working


Is it totally dead? No display? Or just does not cook? If it made an unusual noise before it 'died' something probably shorted out.... You need an ohm meter to troubleshoot. If the fuse is open, switches and HV circuit need to be checked before replacing fuse. Sometimes on the convection Microwaves (not just Sharp) the fuse will 'rust' and open rather than blow. Or the fuse holder can over heat and fail.

Sep 11, 2009 | Sharp Microwave Ovens

3 Answers

Sharp Carousel II Convection Microvave R-3850


My sharp microwave convection oven (R-1870) runs for 59 seconds and stops. If I push start it runs for another 59 seconds and stops. How can this be fixedd?

Aug 29, 2009 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Sharp Carousel Microwave R-1460A no power, door switch went first


You will want to replace the fuse and door switches. You will not be able to run it without replacing door switches. You do not need a new microwave. Door switches go bad, it has nothing to do with radiation.

Feb 19, 2009 | Sharp R-1460 Microwave Oven

1 Answer

Microwave Key Pad stopped working


buy a new one they are not expensive wal-mart has 1000w for about 80 bucks

Jan 25, 2009 | Sharp R-1874 Convection/Microwave Oven

3 Answers

Sharp carousel II microwave/convection oven


The question is... Do you want to put money on a 18year MW, or put it towards a new one? I must admit I love the SHARP Combo MW Convection ovens. I own two. One is almost 25years old. The mechanical Timer Type, but they work great and I can maintain them with 30years ef exrerience. I am now retired.
It does sound like the Magnetronhas broken down, however it could be other things in the Secondary (High Voltage Side). The High Voltage Side is made up of the Secondary HV side of the High Voltage Transformer, A High Voltage Diode, a High Voltage Capacitor, and the Magnetron. The High Voltage Side is DANGEROUS, and CAUTION should be taken to protect yourself against EXTREME HIGH VOLTAGE. unplug from power and DISCHARGE High Voltage Capaciton to frame GROUND before touching anything!!!!

Jan 29, 2008 | Microwave Ovens

Not finding what you are looking for?
Sharp R-1490 Microwave Oven Logo

1,612 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sharp Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

8820 Answers

Devabhakthuni...
Devabhakthuni...

Level 2 Expert

224 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Sharp Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...