Hello, Vishal -
I have not yet found a manual for a National microwave model NN-K577F online.
The National brand was a subsidiary brand of what is now known as Panasonic. National brand kitchen appliances stopped being manufactured in 2008.
Source of information:
https://en.wikipedia.org/wiki/National_(brand)The Panasonic company may hold a copy of the user manual for the NN-K577WF model in its archives, however.
Panasonic is headquartered in Japan. However, unless you reside in Japan, I suggest you contact the Panasonic division located where you reside:
https://www.panasonic.com/global/support/get_support.htmlOn the home page for the Panasonic division in your country, there should be a Contact Us link or a Live Chat link. Ask if the company Archives holds a copy of the manual for the National microwave oven NN-577WF or the Panasonic microwave oven NN-577WF and if you can obtain a copy. Note: There may be a charge for a copy.
Best wishes.
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