Dell Latitude C840 - Manual (Page 42)

3. Remove the M2 x 3-mm screw that secures the modem daughter card to the system board.
4. Use the pull tab to pull the modem daughter card straight up out of its connector.
5. Disconnect the modem cable from the modem daughter card.
Replacing the Modem Daughter Card
1. Connect the modem cable to the modem daughter card.
2. Use the screw and boss holes at opposite corners of the modem daughter card to align the card, and press the card into its connector on the system
board.
3. Install the M2 x 3-mm screw that secures the card to the system board.
4. Replace the memory module/modem cover.
Mini PCI Card
You must remove the optional Mini PCI wireless modem (if installed) before the system board can be removed. A wireless modem card must be connected to
the internal antenna of the computer.
Mini PCI Card Cover
1 modem daughter card
2 M2 x 3-mm screw
NOTICE: Do not pull on the modem cable. Pull the connector on the end of the cable to disconnect the cable.
NOTICE: The cable connectors are keyed for correct insertion. Do not force the connections.
NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.