I know similar things have been posted and resolved but I can't seem to get any of the solutions to work.
My very much home made three axis router has been running fine; I cut a three hour job on it last week running mach3 via parallel port no problem. But then yesterday it started stepping the y axis any time that it's enabled. The stepping is not smooth it's like there's 50hz interference on the step pin or something. So I switched the last few cables on the machine over to shielded ones and no change. I soldered on a new driver chip for that axis and no change. I hooked up a scope to the incomming signals for parallel port and I can't see steps coming through.
Pulling my hair out here can't figure out how it's happening.
Interestingly if I have the pc off and pull the enable pins up then all the motors are engaged but static not randomly stepping.
Weird that something like this just started happening half way through a job running.
Any help much appreciated, thanks