Dell XPS 15 (L501X, Late 2010) - Manual (Page 23)

Wireless Mini-Card(s) 23
CAUTION: When the Mini-Card is not in the computer, store it in protective
antistatic packaging. For more information, see "Protecting Against Electrostatic
Discharge" in the safety information that shipped with your computer.
Replacing the Mini-Card(s)
1 Follow the instructions in "Before You Begin" on page 9.
2 Remove the new Mini-Card from its packaging.
CAUTION: Use firm and even pressure to slide the card into place. If you use
excessive force, you may damage the connector.
CAUTION: The connectors are keyed to ensure correct insertion. If you feel
resistance, check the connectors on the card and on the system board, and realign
the card.