Fanuc A20B-0003-0744 Master PCB is one of the Masterboards that make up the main system of the Fanuc 5 Control series. This main PCB is the Control Section A master board, that carries the system software and EPROMs. This section A controller runs with A20B-0006-0640 CMOS card and is connected to the section B board, and to other additional cards such as axis boards, tape edit control boards, position displays or CRT’s, and power supply units for the System 5 control. DNC offer a variety of services for the A20B00030744 – Call for Prices – Warranty is 180 days ! Service Exchange, used outright if stock permits.