Fujitsu PRIMERGY TX1320 M5 Upgrade And Maintenance Manual page 128

Power supply unit (PSU)
Figure 51: Removing the power distribution board (B)
▶ Remove the power distribution board from the holder.
Installing the new power distribution board
Figure 52: Inserting the power distribution board (A)
▶ Insert the power distribution board at a slight angle into the holder.
128 Upgrade and Maintenance Manual TX1320 M5