3Com 003686-03 Printed Circuit Board Assembly is a 3Com‑manufactured PCB module identified by the part number 003686-03. This printed circuit board assembly provides the electrical interconnections and mounting platform for components and connectors within compatible 3Com equipment, forming a core element of the device's internal circuitry. In 3Com catalogs and service literature, the 003686-03 designation is used as a replacement part reference for legacy enterprise hardware, and technicians typically verify fitment against the original chassis, backplane, or enclosure associated with the system.
