I don't know what to try next so hoping someone here has a suggestion. My Chinese laser has stopped recognizing the proximity switch stop on the Y axis. I did a continuity check on the wiring, replaced the sensor (2X),
replaced the control board (Ruida 6332M-B EC) and downloaded a fresh version of the software onto a new computer. Adjusting the polarity of the switch doesn't help. The Z axis is controlled by a separate board with an ohmic sensor to cut metal (machine is 300 Watt Co2) but the limit switch control is on the 6332M-B EC board.

I've run out of things to check. Anybody have a suggestion?