Question about Sharp R-530ES Microwave Oven

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Sharp microwave My microwave seem to be switching on but it does not heat or defros any food!

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Re: sharp microwave

The most common causes for a lack of heating are a bad door switch, a loose connection on the magnetron, a bad magnetron, bad connection on the control circuit board, a bad relay on the board, bad high voltage diode, or bad high voltage transformer.


If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa:

Posted on Oct 12, 2007

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How to fix loud hum and no heating in Sharp model R-308KW?

There could be a variety of reasons why this happens, but the likeliest
reason is the secondary interlock or monitor switch is broken. These are micro switches that tell the microwave that the door is closed. If this switch is broken, then the microwave thinks the door is still open and the carousel table won't turn, and the oven will not heat up.
I replaced an interlock switch last Saturday. The switch was $7.00 and took me an hour.
Ask your local repair person to test the interlock and monitor switches first, then go from there.
Good luck,

Jul 09, 2014 | Sharp R-308KK / R-308KW 1100 Watts...

1 Answer

Sharp r580d

If the inside light, turntable and internal cooling fan all come on when you try to cook, but it's not heating, then check the bottom door switch and its mount.

See these help files:

Jan 08, 2014 | Sharp Microwave Ovens

1 Answer

Sharp convection microwave oven model R1875F. It's cooking on the left side faster then the rest of the oven. It seems to burn on the left side and not cook in the middle.

see the next causes. God bless you
Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

Door Switch If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.

High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

Oct 03, 2012 | Sharp R-1870 Convection/Microwave Oven

1 Answer

Sharp 1200w microwave seems to be tripping lightly (can hear clicking noises)and cause heating to be irregular

Clean the food off the inside top of the microwave Now,Or that noise you are hear will stop along with the microwave. The food gets on the Formica Squire which is how the micro waves heat your food. 1st unplug the Microwave then spray the inside of the unit with something like Fantastic or something strong and use glove so you don't burn you hand,Also if you have a scrub brush use it,And clean all the soap out and raise very well.

May 02, 2012 | Sharp Microwave Ovens

1 Answer

Sharp 953 microwave isn't heating up food.

It may be a bad door switch or door switch mount. It would not be the middle switch, rather the bottom or possibly the top one.


Info on ordering Sharp UK parts / spares is here.

If you're in another country, you can visit Sharp's world portal here.

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

Dec 12, 2009 | Sharp Microwave Ovens

1 Answer

Sharp microwave losing cooking power

If the supply voltage is low it will take long time to heat foods. The second reason is the Magnetron. Since it is in the warranty period you can call at the sharp authorised service center. They will do it free of coast.

May 04, 2009 | Microwave Ovens

2 Answers

Regarding microwave

This is due to the magnatron failing (this is the part of oven that cooks the food!) This is the most likely cause of y isssour oven not heating the food!

Magnatron needs replaced for oven to work again!
Please rate this free soultion!

Jan 18, 2009 | Sharp R-308J Microwave Oven

1 Answer

My Sharp R-340D microwave works perfectly but Does NOT HEAT FOOD

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

Microwave Oven Basic Troubleshooting Tips



Sep 22, 2008 | Sharp R-1610 Microwave Oven

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