Genuine HP Color LaserJet Enterprise M651 formatter board (main logic board) with part number 5851-4728 Rev A / CZ199-60001. This is the primary control board responsible for processing print jobs, network connectivity, and printer operations. Includes all standard I/O ports and expansion capabilities typical for this enterprise printer model. Board is in good cosmetic condition with normal signs of use. Perfect for repairing a non-working M651 printer or for parts/upgrade purposes.