Dell LATITUDE D400 - Manual (Page 28)

4. Align the Mini PCI card with the connector at a 45-degree angle, and press the Mini PCI card into the connector until you feel a click.
5. Connect the antenna cables to the Mini PCI card, with the white cable in the Mini PCI connector closer to the palm rest, and the black cable in the Mini
PCI card connector closer to the display.
6. Replace the keyboard .
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1 securing tabs (2)
2 Mini PCI card connector
NOTICE: To avoid damaging the Mini PCI card, never place cables on top of or under the card.
NOTICE: The connectors are keyed to ensure correct insertion. If you feel resistance, check the connectors and realign the card.
NOTICE: Handle the antenna cables with care because they are very fragile.
NOTE: If a Mini PCI card was not already installed, remove the foam that secures the antenna cables before you install the card.