A1200 Keyboard issue

[amigakit]

Check the green cable to the motherboard is inserted securely.  The keyboard plastic membrane with carbon contacts could be at fault or misaligned.

Otherwise you can just replace the keyboard on its own with a brand new A1200 keyboard

[amigakit]

The short ribbon cable is part of the larger membrane inside the keyboard unit hence undetachable

If part of the plastic keyboard membrane gets damaged or the carbon pads for keys wear it is very difficult(impossible?) to fix.