Dell PowerEdge C6220 II - Manual (Page 181)

Removing and Installing System Components | 181
2 Replace the screws that secure the interposer extender for 2U node to
the interposer-extender tray for 2U node. See Figure 3-21.
3 Reconnect all the cables to the interposer extender for 2U node. See
Figure 5-11.
4 Replace the system-board assembly. See "Installing a System-Board
Assembly" on page 171.