Question about Sharp R-1480 Microwave Oven

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Blow out Fuse

I already change the fuse from the supply line, but it keeps on blowing ones you plug the power


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Re: Blow out Fuse

Normally this would be a bad door switch, but it may also be a broken tab on the door switch mounts.

On that model, the fuse is located on the door switch mounts (called the door hook) so you've been there, and that's the area to focus on.

The hooklike projecitons on the door (called the latch heads) are held secure by the door hook so the switches are activated properly.

Sometimes a little tab breaks on the door hook which causes the switch to rotate out of place.

Other times, one or more switch will stick or short, and blow the fuse or breaker.

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa:

You can order Sharp parts from Tritronics at

You can find exploded view diagrams for this model here: (3 is correct)

Here is some extra info for you:

A microwave can be dead for many reasons.

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.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder.

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

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

Posted on Dec 06, 2007

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This model just stopped working while heating food up. Now cannot get even the power to register when you plug it in. Is this doen for?

There is usually a 125V, 20 AMP line fuse inside the microwave, mounted at the point where the power cord enters the back of the unit. Unfortunately, you will need to uninstall the oven (if this is an over the range model), UNPLUG it and remove the exterior case to access. The case comes off in various ways depending on manufacture and model. If the model number you listed this question under is correct, the line fuse is connected in line with the power cord inside the unit and is listed as part of item 4 in the parts listing (part number STD384200).

If the line fuse is blown, you can usually purchase a box of fuses at a hardware store for just a little more than what the manufacturer charges for a single fuse. 125V, 20AMP Ceramic Slow Blow fuses are recommended.

If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit. These ovens can blow a fuse by simply sitting idle. This can occur from any power fluctuations, brown outs, voltage spikes, etc. Or, it could be the symptom of a component that may have failed. If you find the internal fuse blown and replace it, only to have it blow again, you have a more significant problem than a simple blown fuse.

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Now this is not quite clear enough to give an accurate single answer.

Is it the fuse within the microwave or the general house supply fuse that blows?

If its the latter then an electrician needs to create a separate fuse line to reduce the overall load on the fuse, 15amps generally. Many houses have too many plugs being used at once on the same circuit TV, dishwasher, fridge/freezer, electric jug etc all drawing power. Big screen Tv's are the worst offenders.

If it is the fuse within the Mwave, then it needs attention,as a short has developed in the unit and needs to be corrected.

I will assume it is less likely to be this and punt for the first solution ( House fuse box overload)

Please rate my help++++Thanks for using FIXYA

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When your microwave oven doesn't work at all, it means interior fuse inside the microwave has blown (usually a part inside the microwave makes this fuse blow). Sometimes a bad fuse holder inside the microwave cannot hold the fuse tight enough and the fuse will blow as well. If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work. It can also be due to a stuck or faulty door switch which might have blown the interior microwave fuse.

Please do rate the solution and revert for further assistance.


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