Replacement CB28 MAIN Motherboard / Formatter PCA Assy for Pro WP-4521 — Main Board USB Logic Card

Direct replacement main board for Pro WP-4521 printers, designated CB28 MAIN. This motherboard functions as the complete formatter PCA assy, serving as the formatter card, logic card and USB board required by the WP4521 / WP-4521 series. Ideal as a swap-in main board to restore printer logic, USB connectivity and formatter functions without changing other components.