Dell Inspiron 1520 (Mid 2007) - Manual (Page 173)

Adding and Replacing Parts
173
3 Connect the appropriate antenna cables to the
WLAN card you are installing:
If the WLAN card has two triangles on the label (white and black),
connect the white antenna cable to the connector labeled "main" (white
triangle), and connect the black antenna cable to the connector labeled
"aux" (black triangle).
If the WLAN card has three triangles on the label (white, black, and gray),
connect the white antenna cable to the white triangle, connect the black
antenna cable to the black triangle, and connect the gray antenna cable to
the gray triangle.
NOTE:
The gray antenna cable may not be available in all computers. The
presence of the gray antenna cable in your Mini Card compartment depends
on the type of display.
4 Secure unused antenna cables in the protective mylar sleeve.
5 Replace the cover and tighten the captive screws.
Removing a Mobile Broadband or WWAN Card
NOTE:
WWAN is also available on an ExpressCard (see "Using ExpressCards" on
page 87).
1 Follow the procedures in "Before You Begin" on page 153.
2 Turn the computer over.
3 Loosen the captive screws on the cover of the Mini Card compartment and
remove the cover.