This is my 3rd machine build with Mach3. New machine is a 48x48 scratch built running Mach3 and a USB Motion Card from China.
Has been running great for 3 weeks, then I cannot Jog Z Axis in both directions.
I swapped the 3-wire connections from the control board out, Z and X Axis's. Everything works fine.
Swapped them back, no Z- Jog. Anyone heard of this ?

Craig