A20B-0004-0171 Fanuc axis control board for the Fanuc DC velocity unit. This board wtihout PSU section is in stock fully tested as a DC single axis command pcb in which DNC can offer immediate service exchange - shipping out today to anywhere in the world, as well as offer full testing and repair services upon the A20B-0004-0171 Fanuc servo boards. The complete drives including the metal base units from the DC thyristor series are supported by DNC.