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« on: February 15, 2008, 06:20:22 PM »
Thanks for the assistance Hood and yes it does appear to be the drive board that is the problem.
As to the new replacement board also being a dud, I went back and read all the info sheets that came with the board again and discovered the following.
Unlike the first board which was factory set to suit the stepper motors I purchased with it, this one comes with the Vref Voltages set to zero and the board will not operate until these are reset to the required 3.35v.
The instructions given areas follows:
Adjust your Vrefs at TPX, TPY, TPZ.....(Black lead to GND, Red to TPX) Turn Potentiometer counterclockwise for +.
Do not adjust Vref voltages with motors attached or to voltages higher than 3.60v.
Being for the most part a "plug and play man" I suddenly realised how little I really know about this stuff. I know what a potentiometer does but not a clue as to what it looks like, where to find it on this board, or how to go about testing and adjusting it or them to the correct voltages.
If you or anyone else could assist me with some detailed instructions on how to go about this task without creating lots of expensive smoke then I think I may be heading in the right direction.
Many thanks
Lawrie