3.Power off the server and disconnect the power cables. See “Powering Off the Server” (page 95).

CAUTION: The removal and replacement of the I/O board assembly occurs through the rear of the rack for rack-installed servers. Carefully follow the board removal and replacement procedures. You must first perform several tasks with the server extended out from the front of the rack.

4.If rack installed, slide the server completely out from the rack. See “Extending the Server from the Rack” (page 180).

5.Remove the top cover. See “Removing the Top Cover” (page 181).

6.Disconnect the internal USB cable from the connector on the core I/O board (Figure 6-24).

7.Disconnect the SAS cables attached to the SAS core I/O card in PCI slot 1.

CAUTION: When disconnecting the SAS cables, note the labeling on the cables. Both cables and sockets are clearly marked with the correct channel. When reconnecting these cables, match each cable with the appropriate socket on the SAS core I/O card. If the cables are mismatched, the server operating system may not reboot.

8.Slide the server completely back into the rack.

9.Open the cable management arm wide enough to slide the I/O board out the rear of the rack.

10.Disconnect all external cabling attached to ports at the rear of the chassis.

11.Press in on the retention levers to unlock the I/O board assembly extraction handles (Figure 6-24).

226 Removing and Replacing Server Components