Fujitsu PRIMERGY TX2550 M5 Upgrade And Maintenance Manual page 71

Basic hardware procedures
Figure 22: Installing the top cover (rack model) (A)
▶ Open the locking lever on the top cover.
▶ Lower the top cover onto the chassis, recessed by 2 cm.
Figure 23: Installing the top cover (rack model) (B)
TX2550 M5 Upgrade and Maintenance Manual 71