Dell Inspiron 1521 (Mid 2007) - Manual (Page 162)

162
Adding and Replacing Parts
4 Disconnect the two antenna cables from the
WWAN card.
5 Release the
WWAN card by pushing the metal securing tabs toward the
back of the computer until the card pops up slightly.
6 Lift the
WWAN card out of its system board connector.
1 antenna cable connectors (2) 2 WWAN card
1
2