HP Point of Sale rp5000 Hardware Reference Manual page 23

Hardware Reference Guide
6. Remove the USB data cable 1 and power cable 2 connected to
the card.
7. Pull the retention arm away from the socket 3, then carefully
rock the card back and forth until the connectors pull free from
the socket. Lift the card straight up, then pull it in toward
the center of the chassis to maneuver it around the chassis frame.
Be sure not to scrape the card against other components.
Removing the USB+Power Card
To replace the USB+Power card, reverse the above procedure.
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