HP Z400 Maintenance And Service Manual page 155

7.
Set the cold plate retention ring on the CPU heatsink mounting base, and then slightly tighten a
single retention screw (see Installing the CPU heatsink on page 155) as shown in the following
figure.
CAUTION:
Do not scratch the system board while maneuvering the cold plate assembly or you
might damage components.
TIP:
Tighten the retention ring screw only one or two turns to keep its corner in place while
allowing the rest of the ring to move.
Figure 5-68
The retention screw
Removing and installing components
ENWW 143