Fujitsu PRIMERGY TX1330 M4 Upgrade And Maintenance Manual page 325

Removing the FBU
Figure 208: Removing the FBU holder from the chassis
▶ Lift up the green locking handle on the FBU holder (1) while sliding the FBU
holder in the direction of the arrow as far as it will go (2).
After that, the shoulder screw caps on the chassis will rest in the wide
ends of the keyhole slots on the FBU holder.
▶ Lift the FBU holder out of the chassis (3).
TX1330 M4
Expansion cards and backup units
Upgrade and Maintenance Manual 325