I have Taz 6 that I have been using pretty hard for at least three years. I have replaced one stepper motor (Y) and swapped the X and Y steppers due to some print failures but otherwise the unit has been pretty solid.
Today the lower Z limit switch function failed, it just keeps driving down until I switch the power off. I did trace the wires back to the printed circuit board on the unit and checked the switch function…the switch is definitely closing when depressed.
I did try running the unit all the way to the top and the top Z limit switch does work.
What is my next step?