Hold down the three piano, guitar, and mallet sound group buttons and switch on the power to the keyboard. The version number will be shown in the screen along with the video output mode that hs been set.
This is excerpted from Getting the most from your KN7000 authored by Alec Pagida.
Everything you will probably want to know and is not in your KN7000 manual is to be found in this companion manual. I highly suggest you buy it. I think Technote has it. I bought mine from Walt Tenay in US.
Best to all