Dell SmartStep 100N Owner's Manual page 59

Turn the computer over, and remove the screws from the modem
8
cover.
Place your finger under the cover at the indentation and lift and slide
9
the cover open.
Remove the existing modem:
10
a Remove the screws securing the modem to the system board, and
set them aside.
b
Pull straight up on the attached pull tab to lift the modem out of
its connector on the system board and disconnect the modem
cable.
modem cable connector
Connect the modem cable to the modem.
11
NOTICE: The cable connectors are keyed for correct insertion; do not force
the connections.
Align the modem with the screw holes and press the modem into the
12
connector on the system board.
modem cable
Re placing Pa rts 59