Question about Sharp R-1480 Microwave Oven

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Dead replaced fuse now makes loud noise

My Sharp R-1480 manufactured july 1998 instantly stopped working I replaced the fuse and it powered back up. Now it makes a very loud rumbling or growling noise like a machine gun. Is that a problem that probably caused the fuse to blow ? Is it worth repair ?

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  • Anonymous Mar 26, 2014

    growl or low hum noise then blows fuse



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  • 53 Answers

Yes that noise is causing your fuse to blow. Machine gun sound sounds like the High Voltage Capacitor or High voltage diode is bad. (Loud humming sound is usually a bad magnetron or bad power transformer). Most of these parts are inexpensive, except for the magnetron. But most of the repair bill is most likely going to be for labor.

Based on your model, it looks like an over the range microwave. And to fix any of these problems require the removal of the microwave from the wall. So its up to you if you want to deal with that hassle. But you also have to consider that you'll probably have a hard time trying to find a new microwave that will fit.

Posted on Mar 28, 2008


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Posted on Jan 02, 2017


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Where and how do you get to the fuse

Dead appliance, power on wall outlet.


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.
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.

Mar 30, 2011 | Sharp R-1480 Microwave Oven

2 Answers

Sharpe model R-1480 not heating (it sounds a little louder)

A loud sort of "groaning" noise and no heat is the sign of a bad magnetron tube. The magnetron is the microwave source, and when they go bad it's usually time to replace the oven. Most microwave repairs, especially a magnetron replacement, should be left to professionals. There are lethal voltages under the cover, and the chance of microwave leakage if the repair isn't done properly. With the price of a replacement tube and labor for the repair, it's often doesn't cost much more (and sometimes even less!) to buy a new oven.

Sorry I can't give you a more positive answer, but thanks for using Fixya!

Oct 31, 2010 | Sharp R-1480 Microwave Oven

2 Answers

Microwave popped and now does not heat

Okay, first we need to separate the situations. You were boiling water on the stove and had the range hood fan running to **** up the steam. Then you put something in the microwave to heat and you heard a pop and then zip-o.

The water on the stove has nothing to do with the situation, the fan you turn on is not part of the microwave, so it has nothing to do with the microwave.

The pop you heard and then the humming suggests the magnetron failed. You said you found a blow fuse and replaced it and still nothing, right? The magnetron is the most likely culprit...I would think it is safe to say that the magnetron shorted and drew enough current to blow the fuse.

Replace the magnetron and if that doesn't work, let me know here. Good Luck!

Sep 14, 2009 | Sharp R-1480 Microwave Oven

1 Answer

Squeaky carousel

It can be oiled with something akin to Pam (cooking oil spray). You don't want petroleum products in your oven -- it'd take forever to get the fumes out.

I'd try first just spraying some under the turntable as far back toward the center as you can get it -- run oven -- spray some more, etc., etc.


Aug 15, 2009 | Sharp R-1480 Microwave Oven

1 Answer

Sharp microwave is suddenly dead. 120 volt power is OK

It sounds to me that the fuse has blown out. this could be fixed at home if you are handy. You don't have to be super handy .I can walk you through this repair. DFD

Apr 14, 2009 | Sharp R-1480 Microwave Oven

1 Answer


20 A fuse inside m/w is out. The problem could be with HV condenser, one of the door switches shorted, computer board, magnetron. Needs technician to take a look on it.

Dec 03, 2008 | Sharp R-1480 Microwave Oven

1 Answer

Sharp Microwave Oven Corousel

I replied privately to this, stating it may be the HV capacitor, or possibly the magnetron or transformer and giving links.

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

Dec 31, 2007 | Sharp R-1480 Microwave Oven

2 Answers

Microwave possible blown fuse??

Hi Lonnie,

Yes, both of them should have a fuse or two in the internal power adapter. If you open them up, you should be able to find it fairly easy (start tracing from where the AC power line comes in on the board). Make sure you unplug them and leave them unplugged for a good time

Once you find the fuses, you can take them to a local electronic parts outlet for identification, testing, and replacement. Most electronics places will have a meter on hand and be happy to do this for you for free.

Since you didn't give a city location for yourself, I'm afraid I can't offer a local store recommendation.

As always, when working on a TV, be VERY careful to make sure that the capacitors are discharged. See this faq:

Dec 05, 2007 | Sharp R-1405 / R-140 Microwave Oven

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