Dell PowerVault 725N (Rackmount NAS Appliance) - Manual (Page 44)

15. Lay the system board/backplane board assembly down on a smooth, nonconductive work surface.
16. Remove the three Phillips screws that secure the system board to the backplane board. See Figure 4 -22 .
Figure 4-22. Separating or Joining the Backplane and System Boards
17. Remove the power cable from the power connector on the system board. See Figure 4 -22 .
18. Remove the other end of the power cable from the back side of the backplane board. See Figure 5 -5 .
19. Pull the backplane board away from the system board. See Figure 4 -22 .
Installing the System Board/Backplane Board Assembly
To reinstall the replacement system board/backplane board assembly, perform the following steps:
1. Join the two boards together. See Figure 4 -22 .
2. Secure the two boards with three Phillips screws. See Figure 4 -22 .
3. Connect the four-conductor power cable from the back of the backplane to the power connector on the system board. See Figure 4 -22 .
4. Lower the system board/backplane board into the system chassis with the grounding posts through the holes on the system board.
5. Slide the system board/backplane board assembly back towards the system back panel.
CAUTION: See your System Information Guide for complete information about safety precautions, working inside the computer, and protecting
against electrostatic discharge.