Hi,
Sorry for the english, I don't speak italian
I hope you will understand everything I wrote !
The difficult task to do this is to find a TEAC drive (model FD-235J) and replace the cm fd 2000 one. The model is very important. The drive will not work with another one.
Probably get a cmd fd 4000 dos chip but not sure if the fd 2000 one can works. The best is to find cmd fd 4000 owner able to copy it and burn you a new one.
Ciao