Dell Precision 390 User Manual page 92

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 new card, remove the filler bracket to create a card-slot opening. Then, continue with step 7.
6. 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. If your card includes a retention mechanism, remove the top of the retention mechanism by
pressing the tab and pulling up on the top. Gently pull the securing tab, grasp the card by its top corners, and then ease it out of its connector.
1 PCI Express x16 card
4 PCI Express x1 card
7. 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.
8. If you are installing the card into the card connector, position the card so that the securing slot is aligned with the securing tab, and gently pull the
securing tab.
NOTICE: Ensure that you release the securing tab to unseat the card. If the card is not removed correctly, the system board may be damaged.
9. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.
3 card retention door
2 PCI Express x16 card slot
58 PCI Express x1 card slot
3 securing tab