Dell PowerEdge C6220 - Manual (Page 249)

Installing System Components | 249
5 Remove the screws that secure the middle-wall bracket to the chassis.
See Figure 3-68.
6 Lift the middle-wall bracket out of chassis. See Figure 3-68.
Figure 3-68. Removing and Installing the Middle-Wall Bracket
1 middle-wall bracket 2 screw (6)
7 Disconnect all the cables from the upper middle plane.
Note the routing of the cable on the chassis as you remove them from
the system. You must route these cables properly when you replace
them to prevent the cables from being pinched or crimped.