Model #R-305KS SHARP Countertop Microwave

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Question and Answers

Q:

Power level not functioning R-305KS Sharp Microwave

A:

Thank you for choosing SearsPartsDirect.com. I understand how important it is to have a properly working microwave. I have included a link to our ManageMyLife page where you can view your manual for setting instructions. Just click the blue link below to be taken to the page.
Owners Manual for Sharp Microwave Model # R-305KS
I can appreciate wanting to diagnose and repair the microwave yourself, however I strongly recommend against it. We do not give repair information on microwave ovens because they are inherently dangerous to service. Microwaves contain high voltage internal components that can retain a lethal electrical charge even when the microwave is completely unplugged. You need special equipment to work on a microwave starting with an anti-static wrist strap grounded to the microwave to even test components in it. Even minor door repairs and adjustments can cause microwave leakage, and a microwave shielding leakage test MUST be performed using a survey meter after any microwave service.
For these safety reasons I strongly recommend having this repair completed by a qualified service technician. You can have it repaired at your home by a Sears technician by calling 1-800-469-4663. You can also click HERE to schedule an appointment online. Thank you for your understanding in this matter and I hope we can help you with any other questions and repairs in the future. Thanks for using SearsPartsDirect.com.

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Lokelani -
Sears Technician
September 11, 2013
Q:

More advanced microwave oven diagnostics needed:

A:

Microwave can often be replaced at a lower cost than repairs. Since yours is relatively new, I can understand wanting to get your money's worth. If you would like to check the parts list at Sears Parts Direct to check parts prices, it might help you decide if repair is the way to go. If you would like to also check prices of new microwaves, an option is Sears.com. I attached both of those links below. If you feel the microwave has really not held up as expected and would like to contact Sharp, I also added the link for customer service contacts for Sharp. Perhaps these will help while you wait for the expert.

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Barbara H. -
February 26, 2011
A:

Thanks...I've already done all of those things. Sharp won't even try to help, 'cause I'm not an authorized service tech. Sears Parts Direct has parts, but at this point I don't know which part, if any, is the problem. Their parts are really expensive too...$3.49 for a screw...yikes!! A magnetron costs as much as a new oven. I really need some better diagnostics here. I can't help but think this problem has a solution, and I should be able to figure it out (with help).

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John -
February 26, 2011
A:

Thank you for your question and I understand your concern. Generally speaking when a microwave makes a loud humming noise when the high voltage circuit powers up is because of a faulty diode/rectifier or a faulty magnetron. If the diode/rectifier is good then I must assume the magnetron is the failure. If you haven't replaced the rectifier/diode then you may want to replace it before condemning the magnetron.

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Joey S -
Sears Technician
March 01, 2011
A:

Thanks, The diode was replaced even though it tested OK. Is there a way to test the magnetron?

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John -
March 01, 2011
A:

See image below. NOTE: Be sure to disconnect the voltage supply and discharge the capacitor.

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Joey S -
Sears Technician
March 01, 2011
A:

Thanks Joey, Actually, I had already done those tests on the magnetron, and found no problems. That's what's baffling: according to the tests, the diode is fine, the capacitor is fine, and the magnetron is fine. All of the connections look good too. There must be something I'm overlooking. Are there any more advanced tests or some other way of checking these parts? Is there any other part that could cause this symptom? Thanks, John

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John -
March 01, 2011
A:

John: Based on your findings the microwave should be heating. I do not have any other instructions to provide that you haven't already performed. I recommend taking it in for repair or purchase a new one.

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Joey S -
Sears Technician
March 02, 2011
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Q:

Microwave buzzes and won't heat:

A:

Making repairs to some types of appliances does require a higher level of knowledge. I understand you feel comfortable making these repairs, but if you do decide you would like an experienced technician to assist, an option is to visit Sears Home Services and use the handy scheduler. I attached that link below. In the meantime, while you wait for the expert, you can check a general answer I found for this same issue. It is also attached below. Hope this helps. Be safe!

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Barbara H. -
February 11, 2011
A:

Thank you for your question.

I am sorry but our policy is not to give repair information on microwaves because the dangers of the high voltage a microwave produces and can store. If you are set on checking the capacitor, you could Google how to safely check a microwave capacitor. This will bring up the information you are looking for. Again, I do not recommend homeowners repair microwaves.

You can have it repaired at your home by a Sears technician. Here is a link for the website: Sears Home Services .

Thank you for using Manage my life.

Mark T.

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Mark T -
Sears Technician
February 12, 2011
A:

Thank you for the replies. I found good information here: (http://www.gallawa.com/microtech/cap_test.html) I tested the capacitor, and found that it was fine. Then I tested the new diode and found that it was faulty. I contacted the supplier of the new diode, and they will be shipping out a replacement, no charge. I hope it works.

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John -
February 14, 2011
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