The Technics KN2000 Keyboard has a non-standard 24 pin Floppydrive connection.
This cannot simply be connected to a Gotek Floppydrive Emulator. You need an adapter cable for this.
The following diagram gives you an overview of what the connections on such an adapter / adapter cable should look like:
There are also (apparently) adapters available for connecting a gotek floppy drive to a technics KN2000 keyboard, which do this conversion without tinkering and soldering.
Where and whether these are still available is unknown to me!