Dell Precision 390 User Manual page 88

1 release tab 2 card retention mechanism
4. If your computer includes a card retention mechanism to secure the card in place from the top:
a. Pivot the mechanism upward and gently press the release tab downward to release the mechanism from the two tab slots holding it in place.
b. Set the retention mechanism aside in a secure location.
5. If you are installing a long card, repeat
6. If you are installing a new card, remove the filler bracket to create a card-slot opening. Then continue with step 8.
7. If you are replacing a card that is already installed in the computer, remove the card.
If necessary, disconnect any cables connected to the card. Grasp the card by its top corners, and ease it out of its connector.
8. Prepare the card for installation.
See the documentation that came with the card for information on configuring the card, making internal connections, or otherwise customizing it for your
computer.
CAUTION: Some network adapters automatically start the computer when they are connected to a network. To guard against electrical shock, be
sure to unplug your computer from its electrical outlet before installing any cards.
9. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.
1 bracket within slot 2
4 card not fully seated
10. Before you close the card retention door, ensure that:
The tops of all cards and filler brackets are flush with the alignment bar.
l
The notch in the top of the card or filler bracket fits around the alignment guide.
l
3 card retention door
step 4 for the card retention mechanism near the system fan.
bracket caught outside of slot 3 card fully seated