I had the same setup on my A1200, when I changed system from an A2000 which was broken. Winner Z IV and Picasso II. It never worked. The System was at a local dealer for a long time. He changed the mainbord, the Z-IV the turboboard.
It didn“t work. It was impossible to get the Picasso II working with the Z IV Board. So I ended up with a Cybervision 64/3D which worked without any problems since then.
Greetings
Civ206