I am sorry, I don't have time to talk you trough, but it would help if you'd answered ALL questions, when asked. We are only trying to help. For example, the question about if this never worked or it worked at one time, but now not working any more.

There is no need for an oscilloscope normally, a simple DVM would be more than enough to check all the wiring. The untidy wiring in itself is not disturbing me, but it is a good source of error. The picture you included is so small, it is for me impossible to see what is connected to where. Did you make a schematic of the connections, or you just started wiring? A drawing would be more helpful than a picture of the wiring in my opinion. Also, the second picture is showing ONE axis configuration, but you are not saying which one. Anyway, how about the other two axis configuration?

I also assume you bought an original UC100 from a legitimate seller, not one of those fake eBay copies. Those copies may or may not work, but most probably will never really get it right with a fake one.