Fujitsu PRIMERGY TX1320 M5 Upgrade And Maintenance Manual page 129

Power supply unit (PSU)
Figure 53: Inserting the power distribution board (B)
▶ Place the power distribution board on the four hooks of the holder (see
circles) and push it down.
Figure 54: Recesses on the power distribution board
▶ Take note of the four recesses on the power distribution board (see circles).
TX1320 M5 Upgrade and Maintenance Manual 129