Hitachi CB 520H B1 Service Manual page 179

Figure 5-29 Installing the connection bracket
7 (Skip this step when the connection kit L/P is not installed.)
.
Turn over the connector of the connection kit L/P toward PCI expansion
blade, align the connector with the male connector on the main board of
the PCI expansion blade, and then push in the connector.
Figure 5-30 Installing the connection kit L/P
5-27
Replacing parts
Hitachi Compute Blade 500 Series System Service Manual