Question about Panasonic NN-C980 Convection/Microwave Oven
I have a Panasonic NN-C980-B its been making a buzzing noise for a couple seconds when the microwave first turns on. it seems to work properly besides that. the other day it made a noise and then smells of burning components came out of it. but again, it still worked ok.
Today I opened it and all I noticed that there is a Zener Diode burned up. ZD703 is burned and beside it is ZD704. The solder joints of the main transistors look a little tired so I'll clean them up but do you know what these Zeners are so I can replace them?
I have a 2003 Sears Ultra Wave microwave 721.63682300 with a similar problem. A few months ago it started giving off short buzzes when turned on. That stopped but then I noticed that everything took twice as long to heat up. After quite a bit of teardown&inspection I found a circuit break in the inverter board leading to ZD704 diode (pictured). I will now try to find a replacement diode to see if replacing will fix it. Thanks for your postings.
Posted on May 05, 2010
I have a panasonic convection/microwave. Last night, after I cleaned it, using oven cleaner on a sponge, it made a loud humming noise after running on microwave for about 10 sec. It does not make the noise when using the convection oven. I don't know if any heating occurred during the brief time before the humming started. Is there something that got wet and needs to dry out, or needs cleaning? What might be wrong? Should I try using it again, or would that make the problem worse?
Posted on Aug 24, 2011
That's good that it worked for you! Ya it's kind of hard to find out where it's coming from when you don't want to get close to it. As long as it's working and the fan is running to keep it cool, you'll just have to se what happens!
Posted on Feb 16, 2009
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Posted on Jan 02, 2017
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In most cases, this is a problem with the inverter or a bad magnetron.
Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.
I would recommend that you contact your nearest Panasonic-authorized servicer. You can find one here:
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