I'm just getting started in 3D printing by rebuilding an old machine from scratch updating firmware etc. It is all wired up and I am calibrating and completing tuning before a first print.
I am having a weird problem in that when I click "home X" button in Pronterface, my dual Z axes steppers move in the +Z direction and crash. If I home Z via Pronterface, the Z-axis behaves correctly (moves in -Z direction until it bumps off the limit switch). I am using an MKS GEN L V1.0 board and Marlin v1.1.9
If I move thr Z-axis via Pronterface in the +Z direction, it moves as expected. Both Y and X axes also seem to work okay and respond to commands normally via Pronterface.
G28 X command also results in a Z-axis activation and crash.
G28 Y command has the same result.
Any ideas on how to resolve this?