Dell PowerEdge 2900 Hardware Owner's Manual (PDF) - Page 111
Removing the System Board
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CAUTION: Whenever you need to lift the system, get others to assist you. To avoid injury, do not attempt to lift the system by yourself. 1 Turn off power to the system and disconnect the power cable from the power source. 2 Detach all cables from the rear of the system. 3 If the system is a tower system, place it on its side on top of a work surface. 4 Open the system. See "Opening the System" on page 53. 5 Perform all of the additional steps to remove the system board in "Removing the System Board" on page 107. 6 Disconnect all cables connecting the system board to the SAS backplane board, the control panel, and any tape or hard drives in the peripheral or flex bays. 7 Disconnect the cables connecting the system board and SAS backplane board to the power distribution board. 8 Unlock the power supplies from the system and slide them back 5 cm (2 inches). See "Removing a Power Supply" on page 62 9 Using a #2 Phillips screwdriver, remove the five screws from the power distribution board. See Figure 3-34. 10 Remove the power distribution board from the system chassis. See Figure 3-34. Installing System Components 111