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:
The Technics KN2000 Keyboard Gotek Floppy Adapter :
There are also adapters available for connecting a gotek floppy drive to a Technics KN2000 keyboard, which do this conversion without tinkering and soldering.
The Adapter is the same one as used for some Korg machines and you can find it here