Brother Industries, Ltd. B521104-3 Circuit Board

B521104-3 is a Brother Industries CNC circuit board used in Brother 321N CNC Drill-Tap VMC machines, described in catalogs as a CNC Drill Tap VMC Circuit Board and sometimes listed as B5211043 or 9824-PR02C in alternate entries. This replacement board is part of the machine’s control electronics and supports the sequence, I/O, and safety interlocks required for drilling and tapping cycles on compatible Brother drill-tap centers. Compatible models are within the Brother 321N CNC Drill-Tap VMC family, and compatibility should be confirmed against your specific controller configuration before swapping parts to avoid cross-model mismatches. The part number B521104-3 identifies the circuit board commonly installed in these machines and is documented in official catalogs and third-party resale listings. Typical use cases include repair of control-system faults or restoration of a unit that requires this exact circuit board to resume standard drilling and tapping operations. In some marketplace listings, the same board appears under suffixes such as SU or alongside other codes like 9824-PR02C, reflecting regional or distributor variations in catalog entries.