HP ProDesk 400 G4 Disassembly Instructions Manual page 8

Figure 31 Use micro shear 170II to cut the cable ties from
chassis front wall
Figure 33 Press the PSU's latch on chassis
Figure 35 Use PH1 screwdriver to loose screws from top
of PSU
EL-MF877-00
Template Revision B
PSG instructions for this template are available at
Figure 32 Use T-15 screwdriver to loose the screws of PSU
Figure 34 Remove the PSU from chassis
Figure 36 Use PH1 screwdriver to loose screws from bottom
of PSU
EL-MF877-01
Page 8