Hi there.
I have a G540 rev. 1 control, that developed a strange problem. After some difficulties I got it to set up the right way, but the Y drive stepper made noises like loosing steps. Run some short Eagle PCB nc files to test the mill, but the noise in drive Y just got stronger, and getting harder to homing. Switched X and Y cables, run the same test, then the X was bad, Y was running fine. Then I made "A" drive replacing all the Y functions, it was going fine too. Ok I thought, will carefully took it apart, and exchange the "A" 250 drive with the "Y" one, but Y drive still had the problem, So I guess there should be a problem somewhere in the G540's motherboard. Now the question is, can I do some more checking, measure, or maybe any "repairs" to solve this problem. I live in Eastern Europe, and the distance could create some difficulties, bat if there is no other way then I have no choice will send it back to repair.
The 250's are rev.5, those reworked ones. ( Sorry for the long post.)

>Jim.