Fujitsu PRIMERGY TX1320 M5 Upgrade And Maintenance Manual page 209

Expansion cards and backup units
Preparing the FBU
Figure 119: Installing the FBU in the holder
▶ Install the FBU in the FBU holder.
▶ At a slight angle, align the FBU under the both retaining brackets of the FBU
holder.
▶ Push in the FBU until it locks in place.
▶ Ensure that the FBU is properly seated in the FBU holder.
▶ Connect the FBU to the FBU adapter cable.
TX1320 M5 Upgrade and Maintenance Manual 209