Hi gang,

I have a homebuilt cnc router (PrintNC) that uses a UC300ETH controller with a C77 driver terminal board and UCCNC software. I started having intermittent problems with the X axis only moving in one direction and would eventually self correct. Well today it won't. With some searching here in the site, I eliminated loose connections, malfunctioning driver,keyboard, etc. When I checked the voltage for the direction terminals I get 4.7 and 0 for all the drives except the X. It stays at 4.7v despite inputting a direction change. Does this signify a bad controller or would it possibly the attached terminal board? Any thoughts or suggestions are greatly appreciated.

Mike