SOURCE: My Panasonic NN-SD297 microwave is
To deactivate the DEMO MODE on your Panasonic microwave, just press the CLOCK button on the control panel 3 times.
If you were successful, then the display panel will go blank and will no longer display the 'DEMO MODE PRESS ANY KEY' message.
Please comment back here to this page if you have any details to add, have any questions, or just require further general assistance and I will respond as soon as I see it.
I hope that was helpful to you, good luck and take care.
Joe.
SOURCE: looking for a service manaul
See this link.
(I understand this is an old post, but answering it now may help someone later.)
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