Question about Sharp R-930AK Convection/Microwave Oven

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Microwave fuses Hi, I recently bought a Sharp, Model R-305k microwave in S.Korea. It is 120V. My wife bought a dual voltage stereo and plugged it in the 2 round hole recepticle (240V) through an adapter, thinking since the stero worked, so would the microwave. Wrong! Is fixing it as easy as opening up the case, discharging the capacitor and replacing the fuse, or is it broken for good? It has tamper proof screws on the case, but I am a mechanic, and can get them out. I had to click on the wrong product box, because my model is not recognised. Thanks for your help.

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  • Master
  • 1,388 Answers

Just replace the fuse Brother. No harm done. BUT, keep it away from your wife. Maybe she's thinking doubling the voltage would make it twice as fast. NOPE!!!

Posted on May 02, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9085 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

MicrowaveSvc
  • 9085 Answers

SOURCE: Microwave door does not latch; oven does not work

We have the service manual for this model and have uploaded it to our site here to help you.

You will need the
free Acrobat Reader to view or print it in case you don't have it.

If you gently push up on the door latch heads (hook-like devices sticking out of the door) there should be spring tension. If they just flop right up, the spring is off inside.


Normally the problem is not the spring, but a broken spring mounting tab on the door latch head (hook) assembly or the inner door panel.

If it's the door panel, it's usually easier and cheaper to use epoxy and some kind of hardware to fashion a new spring mount.

The door latch head (hook) is easy to replace or repair if that's the issue.

Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the screws you need to remove.

Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.

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

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Posted on Dec 25, 2008

  • 686 Answers

SOURCE: fuse blowing on the sharp microwave r-1874

your fuse will be located somewhere close to where the power cord comes in. It's not a regular glass fuse it looks like ceramic with the silver looking ends that's your fuse

Posted on Feb 20, 2009

  • 38 Answers

SOURCE: Hi our Sahrp Carousel microwave LCD panle display is not working

You have to replace the control board. Sharp has had problems with the display boards for awhile. There is no bulb or fuse you can change.

Posted on Mar 15, 2009

MicrowaveSvc
  • 9085 Answers

SOURCE: My Sharp microwave drawer oven model KB6015KS has

We have the service manual for this model and have uploaded it for you here.

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

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

Posted on Oct 12, 2009

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1 Answer

GE microwave fuse model jes532wn rating 15v but what voltage rating: 120v or 240v ?.thanks


fuses do not have voltage ratings they are a current device. the 15 V does not make sense. It might be 15 A which is the current rating. A standing for Ampere which is the maximum current named after the discoverer of current creating magnetic fields being Andr?-Marie Amp?re in 1826. The 120v or 240v relates to the transformer design in the microwave. The transformer would be design to run on 240V AC 50 HZ AC like in Oz and UK or 120V 60 Hhz AC like used in the USA out of the power point from the power company.
Also the current relates to the voltage. So voltage divided by circuit resistance equals current.denoted by the formula I = V/R

Jan 24, 2015 | GE Microwave Ovens

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Where is the fuse located on the sharp r-1875 microwave


you have to take off the external housing and you will see a glass fuse near the power source.

Jul 19, 2011 | Sharp R-1874 Convection/Microwave Oven

1 Answer

When I press start on my sharp R-305K microwave nothing happing,


Dead appliance, power on wall outlet.

YOUR SAFETY IS PARAMOUNT!

Attempt this only if you are competent.

If your appliance has absolutely no functions at all, remove it from the mains supply, remove the case and see where the mains lead goes in to the appliance and follow the cable until you find the main fuse.
ONLY USE THE SAME TYPE AND RATING OF FUSE TO REPLACE IT.
The usual cause of this fuse failure is the door switches are contaminated or sticking. Check the door switches before putting power back on to the appliance.
Hope this helps.

Feb 24, 2011 | Sharp R305KS Microwave Oven

1 Answer

Can't find the power loss in microwave after fuse, switch check.


Sounds more like the transformer could be bad. Very easy to check. See my tip at http://www.fixya.com/support/r4318968-check_high_voltage_transformer_in . Let me know if you need more help.

hardrocko

Thanks for using FixYa and for the generous rating.

Mar 11, 2010 | Sharp Microwave Ovens

1 Answer

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.

Oct 22, 2009 | Microwave Ovens

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Microwave dead


one of 3 things, for sure the internal fuse is gone, then check for a: bad Hi-Voltage;diode, Hi-Voltage capacitor, or the magnetron tube is defective,none are too hard to change out,but the magnetron is fairly expensive to replace:

Sep 22, 2009 | Microwave Ovens

1 Answer

Sharp half pint


The fuse should be located on an input line filter board INSIDE the microwave. You will need to unplug and remove the outside case to get to it. Simply follow where the power cord comes in and you should see a fuse mounted on a small circuit board somewhere. This is the line filter. The fuse should be a 20 amp appliance fuse that you can purchase at any hardware store. DO NOT attempt to re-energize the oven with the cover removed. There are dangerous voltages present in the high voltage circuit (about 13,000 - 14,000 VAC). Put the outside case back on before trying an op test. Let me know if this helps.

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