Fujitsu PRIMERGY RX4770 M6 Upgrade And Maintenance Manual page 133

Power supply unit (PSU)
Figure 51: Installing the power distribution board (B)
▶ Fasten the captive screw on the power distribution board (1).
▶ Connect the signal cable to the power distribution board (2).
Figure 52: Fastening the screws on the bus-bar
▶ Fasten the four screws on the bus-bar to connect the power distribution
board to the bottom system board (see circle).
RX4770 M6 Upgrade and Maintenance Manual 133