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Old 10-06-2006, 06:34 AM   #1
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We have the R-1875 Sharp combo unit and have recently had the microwave side stop heating. The convection side still works fine. The internal fuse seems ok and appears to serve both functions. I'm suspecting the magnatron has failed. Anyone have this experience and what repairs were required?
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Old 10-06-2006, 06:34 AM   #2
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We have the R-1875 Sharp combo unit and have recently had the microwave side stop heating. The convection side still works fine. The internal fuse seems ok and appears to serve both functions. I'm suspecting the magnatron has failed. Anyone have this experience and what repairs were required?
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Old 10-06-2006, 07:32 AM   #3
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Kelly,

I've not gotten into one of those exact units, but the problem could be one of many items. I've only repaired two microwaves before so I'm no expert, but both that I repaired had high voltage issues. One had a high voltage rectifier open, and the other was the high voltage capacitor shorted. Both problems were inexpensive fixes, but the magnatron will be expensive to replace. I'd really be sure to check out all the other possibilites before replacing the magnatron.

Here is a Excellant Microwave Troubleshooting Document if you want to look further into it. The document has some general issue as well as some troubleshooting suggestions.

Oh yeah...just a general reminder for anyone working on a Microwave They contain lethal voltages, so be careful
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Old 10-07-2006, 05:18 AM   #4
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Call Sharp and talk to them, you may get some help. We took ours to the service center and had it repaired ourselves as it was recently out of war although I think the magnatron is 6 years. Reinstalled ours/not easy / it failed after 2 times use, I was angry and called Sharp/should have called them first/ they paid to have it fixed/ so far it is working.Our center doesn't do in house repair so we uninstalled it twice but read on this forum somewhere that Sears is and does inhouse. See if Sharp will offer assistance. Squeeky wheel gets the grease. Good Luck
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Old 10-10-2006, 04:19 AM   #5
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I had the same problem with our microwave. Same make. It was a loose connection on the High Voltage Transformer. Check the connections on the transfromer, they might need cleaning up.
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