IBM Power System Series Manual page 146

Figure 120: Removing the processor voltage regulator modules or fillers
18. Remove the heat sink from the system processor in location P1-C18. As you face the front of the
system, location P1-C18 is the third processor from the left.
Note: Do not remove the system processor. It is necessary to remove the heat sink in this location so
that you can unplug the cable that connects the power midplane to the system backplane in an
upcoming step.
a. Loosen the heat sink actuation screw by turning the supplied hex key counterclockwise (A).
Loosen the screw until it moves freely. Refer to the following image.
b. Grip the heat sink (B) on opposing sides and remove the heat sink by lifting it upward. Set the heat
sink aside with the module side facing upward.
Note: If you plan to remove dust or debris from the heat sink, this operation must be performed in
another room that is greater than 7.6 m (24.9 ft) away from the work area.
142 Power Systems: Temple's Zeppelin procedures for install, remove, replace