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got the solution from DMG:

1. power off the machine
2. press F1, and keep it pressed
3. switch the machine on
4. press Coolant button (message will be shown at the display)

After that...

I also checked everything. There is a diagnostic mode, where you can test the keyboard. When I enter that diagnostic mode, I can see a different keyboard layout on the screen.
The controller got...

same happens to our Maho GR200 with Phillips 432T Controller.
The MCs got lost (because of powesupply / battery failure), after that the keyboard mapping is wrong.
Does anybody have a solution to...