A20B-1001-0770 Fanuc servo control board for the Fanuc S Series AC Servo Unit. This 3rd version board for the late S series digital triple Axis command pcb is in stock. 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-1001-0770 Fanuc servo boards. The medium yellow plastic drive base units from the S series are also supported by DNC, as well as transistor modules and fuses.