Question about Sharp R-630D Microwave Oven
I would suspect the high-voltage rectifier diode (shorted) or the magnetron, in that order.
Here are some helpful links for testing & safety.
We have the entire service manual for the R-630-series ovens at our site:
You can order Sharp parts from Tritronics at http://www.wehaveparts.com
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Posted on Jan 21, 2008
SOURCE: Loud and not heating
If it's less than a year old, it's still under warranty. If it's just over a year old, GE will still cover parts, but you'd have to pay for labor.
Contact them at http://www.geappliances.com/service_and_support/contact/
The most likely causes are a shorted high-voltage diode or a bad magnetron.
If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, linked here on Fixya: http://tinyurl.com/yzjozk
You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
Posted on Nov 18, 2007
The symptoms you are describing are typical of a magnetron that has gone bad. Continuing to attempt to use the oven in its current condition can cause further damage. So, I would recommend not using it. Microwave ovens are considered dangerous and repairs should not be attempted by anyone that is not electronic saavy. The High Voltage Network inside the oven has voltage potentials of 14,000 volts and higher. If you feel this is something you wish to attempt, the Magnetron part number is 1156751 and costs approx. $158. Keep in mind, if the magnetron has been arcing and making a burning smell you may have burned the protective coating that lines the walls of the waveguide. If the waveguide is damaged it is not repairable. I do not know if this is a replaceable item on your model microwave. Double check your warranty information and/or owner's manual. In many cases the magnetron is warranted for several years beyond the limited warranty that comes with most appliances. Post back with comments and let me know if you want me to assist you further. In addition, if you provide me with your EXACT model number (located along the door opening) I can narrow down parts a little better. I know this all sounds discouraging, but I do hope I have been able to help you.
Posted on Jan 15, 2008
The loud buzzing you hear is the sound of the magnatron tube.That is what emits the microwave radiation and buzzing should be normal. The mag tube may be nearing its end at witch time you will hear no buzzing and hence no heating of foods. Replacement can be costly depending on the model so most people just opt for a new one. Hope this helps
Posted on Jul 30, 2009
Sounds like the magnatron (the bit that creates microwaves) could be goosed. Remove outer cover ( Isolate from the electric supply then remove screws at bottom on the sides).
Find big lump that says on magnatron with model nos etc on, any good electrical supply shop ( Maplins etc) should stock new one.
It is easy to change. It took me about half an hour having never done one before.
Buyer beware the price of the parts could be in excess of a new microwave.
Posted on Sep 15, 2009
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Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
A diode is an electronic component that readily
passes current in one direction only and blocks the flow of current in
the opposing direction. If your microwave's diode has become defective,
your microwave will not heat and you will hear a buzzing noise. Test the
diode to determine if this is the cause of your problem. Replace it if
it is defective.
A capacitor is an electrical device which stores
electricity. A defective capacitor may be why your microwave is not
heating but you are hearing a buzzing or humming noise. The capacitor
will have to be tested to determine if this is the cause of your
problem. A defective capacitor will have to be replaced before your
microwave will work again. Make sure you discharge the capacitor before you test it, though.
A defective magnetron is the third possible cause of
why your microwave is not heating, but you can hear a buzzing noise.
Test your microwave's magnetron. Replace it if it is defective.
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