Dell OptiPlex 3000 Tower Service Manual page 64

Steps
1. Lift the pull tab to open the PCIe door.
2. Disconnect the communication card cable from its connector on the system board.
3. Unroute the communication card cable from the routing guides.
4. Lift and remove the communication card from the system board.
5. Close the PCIe door.
64 Removing and installing components