Dell PowerVault 745N - Manual (Page 4)

b. While pressing down on the cover indention, slide the cover backward about an inch, and grasp the cover on both sides.
c. Carefully lift the cover away from the system.
5. Remove the cooling shroud.
6. Remove the heat sink and processor.
7. Remove the memory modules.
8. Disconnect the hard-drive interface cables from the appropriate card:
a. If this is a software RAID or external storage configuration system, remove the cables from the daughter card.
b. If this is a hardware RAID system, remove the cables from the CERC SATA RAID controller.
9. If this is a software RAID or external storage configuration system, remove the daughter card. See your Installation and Troubleshooting Guide for more
information.
10. Disconnect the control panel interface cable from the J7 connector on the system board. See Figure 1 -2 .
11. Remove all PCI expansion cards installed on the riser board.
12. Using a #2 Phillips screwdriver, loosen the two captive screws securing the riser board to the system board.
13. Disconnect the riser board from the system board card-edge connector.
14. Remove the fan assembly. See your Installation and Troubleshooting Guide for more information.
15. Remove the power supply. See your Installation and Troubleshooting Guide for more information.
16. Using a #2 Phillips screwdriver, loosen the captive screw that secures the system board tray to the chassis floor. See Figure 1 -2 .
17. Using the tab on the system board tray, slide the system board forward, toward the front of the system and lift the assembly up and out of the chassis.
See Figure 1 -2 .
18. Lay the system board tray down on a smooth, nonconductive work surface.
Figure 1-2. Removing the System Board and System Board Tray
Installing the System Board Assembly
1. Unpack the new system board assembly.
2. Align the system board tray so that the tabs on the chassis floor slide into the notches in the system board tray.
3. Slide the system board tray backward until it stops.
4. Using a #2 Phillips screwdriver, tighten the captive screw that secures the system board tray to the chassis. See Figure 1 -2 .
NOTE: After removing the memory modules, record the memory module socket locations to ensure proper installation.
CAUTION: See your System Information Guide for complete information about safety precautions, working inside the computer, and protecting
against electrostatic discharge.