HP EliteDesk 800 Hardware Reference Manual page 34

7. Locate the WLAN module on the system board.
8. Disconnect the internal antennas from the WLAN module.
For instructions, see
9. Locate both external antenna positions on the rear of the chassis.
10. To view the knock-out feature on the left side of the rear panel, remove the antenna cover by pushing
down on the antenna cover (1) and pulling it away (2) from the panel.
11. Insert a Phillips screwdriver into each knock-out feature and rotate (3) to remove the blank.
12. Feed the external antenna cable through each hole (1) and tighten the nut (2) to secure the cable.
28 Chapter 3 Hardware upgrades
Replacing the WLAN module on page 24.