Dell 840 Power Supply, Removing the Power Supply, CAUTION:, Hard drives, •Hard drives, Open the system. See, 5Stand the system upright, •Optical drive (if applicable)

5Stand the system upright.

6Reconnect the system to its electrical outlet and turn the system on, including any attached peripherals.

Power Supply

Removing the Power Supply

CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system. Before performing any procedure, see your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge.

1Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.

2Open the system. See "Opening the System" on page 43.

3Disconnect the DC power cables from the following components:

•POWER CONN connector on the backplane board (if applicable)

•PWR_CONN and 12V connectors on the system board

•Hard drives

•Diskette drive (if applicable)

•Optical drive (if applicable)

•Tape backup drive (if applicable)

4Remove the cooling shroud. See "Removing the Cooling Shroud" on page 64.

5Remove the four screws securing the power supply to the back panel. See Figure 3-17.

Installing System Components 69