HP Compaq NX4820 Maintenance And Service Manual page 130

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Make note of which wireless antenna cable is attached to
which antenna clip on the Mini PCI communications module
before disconnecting the cables.
5. Disconnect the wireless antenna cables 1 from the Mini PCI
communications card.
6. Spread the two retaining tabs 2 that secure the Mini PCI
communications module to the communications
compartment socket. (The side of the module opposite the
socket rises up).
7. Remove the wireless communications module 3 by pulling
the module away from the socket at a 45-degree angle.
Removing a Mini PCI Communications Card
Reverse the above procedure to install a Mini PCI
communications card.
Maintenance and Service Guide
Removal and Replacement Procedures
5–17