Do you keep your KN7 closed with a dust cover on it? I do, and it is always plugged in to power but turned off at the keyboard switch.
Today I found the keyboard was on when I uncovered it and the top was pretty warm in an area that is probably below the transformer.
I wondered how it was turned on, but in looking at the switch I see it projects above the plane of the surface.
I had set a music book on it earlier in the day and apparantly this had depressed the switch.
I don't know about this keyboard suffering damage from being on while covered but I can tell you about a printer that fried itself being on under its cover.
Something to be aware of
Best to all
Bebop

That's another reason why I am so jealouse on those who can play by ear
Thanks for the warning, Bill.
Be careful to your future 'collectors item'
Cees

Maybe Larry's method of controlling the power to the KN7000 is safer

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Willum