Dell POWEREDGE C6105 Hardware Owner's Manual page 107

9 Lift the upper middle plane out. See Figure 3-25.
Figure 3-25. Removing and Installing the Upper Middle Plane
1 screw (9)
10 Remove the screws that secure the mid-plane holder support to the
chassis. See Figure 3-26.
11 Lift the mid-plane holder support out of the chassis. Figure 3-26.
2 upper middle plane
Installing System Components | 107