20 Most Recent Sharp R-4A58 Microwave Oven Questions & Answers


Unplug the oven. Remove the screws holding the top/side cover, then remove the cover. You may have to pull the cover about a 1/4"-1/2" back before you can lift it off.

You may find the lamp socket immediately on the top or the side of the oven cavity, or it may have a sheet metal cover over it (look at the place corresponding to where the light shines into the oven). Use a standard appliance light bulb of the same wattage. You could try an LED replacement of the same lumen rating, but I won't guarantee how long it will last - that depends on how warm it gets up there (LEDs hate heat).

Sharp R-4A58... | Answered on Oct 22, 2014


If there is spark please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is leaking and sparking to the ground. As you have mentioned it was stored, it is quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Now keeping clear switch on , use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues , you can use the microwave safely

Sharp R-4A58... | Answered on Jan 06, 2011


should be a 20 amp fuse on this unit...hope this helps you out

Sharp R-4A58... | Answered on Jan 06, 2011


~

If you were to log on to the manufacturer's web site, I think you will be pleasantly surprised as usually one is able to download, by model number, Customer Instruction Manuals, list of Dealers, for spare parts and service and Installation Instructions as required.

Just Google the manufacturer's name and follow the links. Make certain you are directed to the manufacturer's web site as some search engines direct you to other sites and they charge for the information that is normally free of charge.

I hope this helps.

Sharp R-4A58... | Answered on Dec 23, 2010


If you have no power what so ever its probably the main fuse inside the mirowave. You'll have to take it apart. If you try this yourself unplug it then there are several screws around the cabinet of microwave remove them and make sure that they go back where you took them out from because they may or maynot be the same size or length. once you get the cabint off follow the plug wire up into the micro wave there may or may not be a fuse on the wire just inside the frame of the Microwave but it will be close when you find it take it out and replace with the exact size take it to a appliance parts store and get the replacement.

Sharp R-4A58... | Answered on Sep 13, 2009


We have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk If the fuse blows a few seconds after you hit START, then it's likely that you have an overheating / shorting high-voltage transformer. Try this: Let the oven set unplugged for about an hour to cool completely. Then cook for a minute at the lowest power level. If it runs any longer than it has been, it's probably the high voltage transformer, which is no longer available, but will run about $95 if you can find new old stock. If the fuse blows as soon as you hit START, then it's likely that you have a shorted high-voltage capacitor (#RC-QZA211WRE0) which runs about $25. You can order parts for Sharp models from Tritronics at http://www.wehaveparts.com.

Sharp R-4A58... | Answered on Dec 17, 2008


could be a fuse or burnt out bulb

Sharp Microwave... | Answered on Feb 13, 2020


I searched using https://www.google.com but did not locate an instruction manual for that model Sharp microwave oven.

Recipe at the link below suggests adding extra sugar before baking.

https://www.allrecipes.com/recipe/140772/easy-microwave-chocolate-cake/?_ga=2.211667349.160497590.1579435247-959462057.1579435247

Sharp Microwave... | Answered on Jan 19, 2020


You can try and unplug it for 5 minutes, push the on button to make sure it's completely discharged. Then plug it in. If it does the same thing, it's toast. Getting it repaired will cost about the same as a new one on sale.

Sharp Microwave... | Answered on Jan 11, 2020

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