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Microwave Oven Sharp R820BK Convection Microwave oven. LCD has gone bananas....can't read numbers. What shall I do?

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Re: Microwave Oven

We repair these on a regular basis for customers nationwide with our guaranteed $39.95 service.

We have full details, plus *critical* safety, disassembly, and troubleshooting info at our site. You'll find a link to our site in our listing here on FixYa:

Posted on Dec 01, 2007

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When the unit is turned on it shoots flames from the roof of the unit WHY?

It sound like the antenna behind the plastic plate may be warped and touching the cavity. From my experience when they start shooting sparks it is time for a new microwave.

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Stopped working without power. Unplugging/re-plugging did not work. No display, no buttons responding. Is there re-set option?

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The service manual is here:

You can get Sharp parts from Encompass here.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead several seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
See this:

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Best way short of Sharp is Google the model number of the unit with "manual" to try to locate free one online.

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1 Answer

Light has burnt out

R-820BK/BW Microwave Operation Manual
Due to the risks of death or serious injury the above owners manual suggests that a burnt out light demands a service call by a qualified technician.
That said, if you have a basic level of competence and read the safety hazards involved with microwaves (see a good resource on microwave safety and repair at:
Often, the microwave is divided into two main compartments, the electronics compartment(usually immediately behind the front control panel), and the high voltage compartment(usually behind the electronics compartment). The light bulb is likely in one of these two primary compartments. If it is in the high voltage compartment with the HV Capacitor and magnetron, changing the bulb becomes much more dangerous.
Please be very careful if you do decide to do this on your own... unlike most electronics microwaves can remain lethal, even when unplugged. Hope this helps.

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

Microwave Oven Basic Troubleshooting Tips



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This may be due to the microwave section not working. Check the high voltage diode if it is ok, replace the Magneton.

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