Quote Originally Posted by i2i View Post
Make sure the ground of the driver board is connected to the ground of the parallel port.
Checked the ground and it is okay. Unfortunately I think JAZZCNC is correct. I installed the new PP card & lead and it's doing the same rubbish.

I have contacted Heiz and they have offered me an upgrade to the new Zero3 controller. It is available off the shelf in Germany for 360 Euro + VAT (19%) + shipping. It is a direct plug in replacement, so for the sake of speed & my sanity, I'm going to pull the trigger on it.

I'd still like to rebuild the old unit with CW5045 drivers & BOB as a direct plug in backup, install Mach on the spare PC and get learning.

Many thanks for all your help!

Gavin