Panasonic NN-T990SA Microwave Oven Logo
Posted on Oct 15, 2007
Answered by a Fixya Expert

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1250w panasonic inverter microwave

I went to use my micro this morning, there was no lites, nothing. Checked breaker, it was fine, unplugged and plugged back in, still nothing. I did notice about two weeks ago a sizzling sound for a short time and could'nt see anything that would have caused it. It didn't happen again. I know there is a fuse inside that can be replaced, but the screws  are star shaped with a piece of metal sticking up in the center. Is there a special tool that I have to purchase to take it apart?

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  • Master 473 Answers
  • Posted on Oct 15, 2007
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Yes these are torx safety bits could be a t-10,t-15, or t-20.  Replace the fuse and see what you get.

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  • Panasonic Master 9,179 Answers
  • Posted on Nov 26, 2007
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.
If the unit is running, there's probably no reason to replace the fuse unless it's loose in the holder.

That sizzling is indicative of high voltage or high current. It may be signaling the imminent failue of the inverter.

Due to the lethal voltages used and produced, I do not recommend that an inexperienced person work on these.

If it happens again, I would recommend that you contact your nearest Panasonic-authorized servicer.

You can find one here:
http://www2.panasonic.com/webapp/wcs/stores/servlet/vServiceLocator?storeId=15001

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Was microwaving a hotdog on a paper plate covered by another paper plate and the microwave just kind of went poof and now nothing lites up (display) and it wont work. I checked the breaker it is on and...

Yes there is.

Unplug the MW.
Uninstall from wall mount (if installed that way.).
Remove outer cover by removing the screws at back and (possibly) bottom sides.

Locate fuse. Replace only with an equivalent type and amperage.

You can test the MW without reinstalling or putting the outer covering back on.
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