I have replaced my NH V3400 EP module with a chinese 4 axis controller and am using Linuxcnc to run it. I tried to fix the EP module but there were too many problems. So I took the 34 pin table connector off the EP module and wired it to an old satellite TV enclosure and made a new controller. 4 axis board is TB6600 based. Manual didn't have the table pinouts so I had to beep check the table cable. Attached the manual page and my own pinout page here. I only took some of the pinout data as that was all I needed. While all this worked for me use any of this info is at your own risk. It is known that I made a mistake once.