Fujitsu PRIMERGY TX1320 M4 Upgrade And Maintenance Manual page 101

Power supply unit (PSU)
Figure 24: Removing the standard PSU
Ê Remove the four screws (see circles).
Ê While pressing on the latch behind the PSU (see close-up 1) push the PSU
a few centimeters toward the inside (2).
Ê Take the PSU out upward (3).
Upgrade and Maintenance Manual 101
TX1320 M4