Fujitsu PRIMERGY RX1330 M4 Upgrade And Maintenance Manual page 116

Power supply unit (PSU)
Figure 39: Disconnecting cables (A)
▶ Disconnect the two power cables and the flat band cable from the system
board (see blue arrows).
▶ Disconnect the HDD power cable from the power distribution board (see
orange arrow).
116 Upgrade and Maintenance Manual RX1330 M4