HP 9020 Service Manual page 171

Assembly Access
4-71
5. Remove nine #2 Pozidriv screws that attach 110 backplane to power supply bucket (Figure
4-75).
6. Lift 110 backplane straight up and away from motherboard.
*
*
*
#2 POZIDRIV SCREW
Figure 4-75. Removing 110 Backplane