View Full Version : Need Help! CNC4PC C1 parallel interface card problem

01-19-2013, 05:10 PM
Hi guys,

Wondering if anyone else has had this problem:

I have a C1 parallel interface card that I'm setting up with Linuxcnc. the designated 'Step' pins - 2,4,6, 8 - are not working. I can get motors to turn if I reassign a direction pin as a step pin (so the signal is coming through fine) and testing the pins on the parallel cable connector as it comes into the board shows a rising and falling signal on the step line.

So, for sure, the step and direction signals are both coming into the board, but only the direction signals are making it through; the odd numbered pins are ok, but the even numbered ones are goosed.

Does anyone have a schematic for this board, or any idea which of the several ICs on board serves just these pins? I haven't started tracing traces yet, but it's the only thing I can think of...

cheers folks,