Dell Precision 220 Service Manual page 33

NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain Federal Communications Commission
(FCC) certification of the system. The brackets also keep dust and dirt out of your computer.
Figure 19. Expansion Card Removal
Expansion-Card Guide
Figure 20. Expansion-Card Guide Removal
To remove the expansion card guide, perform the following steps.
CAUTION: Before you remove the computer cover, see
1. Press in on the outer tab, located on the lower-left area on the front of the chassis (see Figure 20).
2. Rotate the top of the card guide away from the chassis front.
Control Panel
Figure 21. Control Panel Removal
1 Expansion card
2 Expansion-card connector
3 Card edge connector
1 Outer tab
2 Expansion card guide
"Precautionary Measures."