The HP 840694-001 smart card reader board is a replacement component for a laptop’s smart card reader. HP’s service guide identifies this part number specifically for the reader board, making it useful when servicing a compatible system with a faulty or missing reader component.
The documented kit includes a metal shield. The guide also provides removal and installation instructions for the reader, describing it as a serviceable internal component. The board is intended to restore the smart card reader hardware in a system designed for this part; the source does not specify reader protocols, connector details or supported card types.