What have I done!

[cropwell]

If you have tried on another PC then you have elimnated the PC and it should have worked so this suggests you have other issues.?
Doesn't matter if PC was old, infact often better being old as the PP will be 5V not 3v.

I would start again removing anything that isn't required and re wire. Then Fresh install of software on Fresh PC if possible.
If still giving trouble then chances are you have damaged chips or something on the control board.

In this Case I would just scrap the whole lot and replace with modern gear.

The only chips on the control board are the drivers. If the input stages are bolloxed then I personally would go with the last idea as the PC seems to be very vulnerable. Case and power supply seem OK though although the case may be a little small for 4 drivers.

Cheers,

Rob

[i2i]

Make sure the ground of the driver board is connected to the ground of the parallel port.

[artmin]

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