I have a Panasonic NN-2501 (yes it says 2501) and just as the unit was finishing heating supper there was a loud buzz and then it shut off. The digital display was off and the range hood fan came on. I unplugged it and plugged it back in and the fan came on and no response from the control panel, not lights or anything. Was the buzz my magnetron going bad? it was built in March 1993. It is 13.0 amps so it is a 1500 watt machine apparently.
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It does sound like the magnetron is failing, when it shuts down it is because the thermal fuse is detecting to much heat from the magnetron and shutting it down, I might add this part is the heart of the system, rough cost would be in the area of $100.00 maybe cheaper. Intallation of this part is very tricky and there is the danger of high voltage, I recommend a pro for safety and correct installation.
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.
This usually indicates damage to the circuit board of the control unit assembly.
We repair these control units nationwide for only $32.50 postpaid.
If you decide first to remove or replace the bulbs or check the sockets or wiring, please unplug the microwave first. Failure to do that is usually how the boards get damaged.
If you or a friend decide to work on it, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
You can usually find helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here: http://tinyurl.com/gv383
BUT - I don't recognize NN-2501 as a valid model number. Could you confirm that?