Installing The Expansion Card; Removing The Power Supply Unit (Psu) - Dell Precision Tower 3420 Owner's Manual

Installing the expansion card

1. Insert the expansion card into the connector on the system board.
2. Press the expansion card until it clicks into place.
3. Close the expansion card latch and press it until it clicks into place.
4. Install the cover.
5. Follow the procedure in

Removing the power supply unit (PSU)

1. Follow the procedure in
2. Remove:
a. cover
b. front bezel
c. hard drive
d. optical drive
e. heatsink fan cover
3. To release the PSU:
a. Disconnect the power cable from the system board [1, 2].
b. Unroute the power cables from the retention clips on the chassis [3}.
After Working Inside Your
Before Working Inside Your
Computer.
Computer.
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