Dell Inspiron 15 (N5040, Mid 2011) - Manual (Page 27)

Wireless Mini-Card 27
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
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.
CAUTION: To avoid damage to the Mini-Card, never place cables under the card.
3 Insert the Mini-Card connector at a 45-degree angle into the connector on
the system-board.