Dell Inspiron PP23LA Owner's Manual page 97

If you ordered the optional modem at the same time that you ordered your computer, the modem is
already installed.
1 Follow the procedures in "Before You Begin" on page 89.
2 Turn the computer over, loosen the captive screws on the modem cover, and then remove the
modem cover.
3 Remove the existing modem:
Remove the screw securing the modem to the system board, and set it aside.
a
Pull straight up on the attached pull-tab to lift the modem out of its connector on the system
b
board, and disconnect the modem cable.
Adding and Replacing Parts
97