Cisco UCS B420 M3 Installation And Service Note page 16

Step 2
Remove the heat sink.
Remove the existing thermal compound from the bottom of the heat sink using the cleaning kit included with each CPU
option kit. Follow the instructions on the two bottles of cleaning solvent.
Step 3
Unhook the first socket hook, which has the following icon:
Step 4
Unhook the second socket hook, which has the following icon:
Step 5 Open the socket latch.
Figure 10: Removing the Heat Sink and Accessing the CPU Socket
Step 6 Press the central button on the provided CPU pick and place tool (UCS-CPU-EP-PNP=) to release the catch.
The CPU pick and place tool is included with each CPU option kit, or the tool may be purchased separately.
Step 7 Remove an old CPU as follows:
a) Place the CPU pick and place tool on the CPU socket aligned with the arrow pointing to the CPU registration mark.
b) Press the button/handle on the tool to grasp the installed CPU.
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See callout 3 in the following figure.
See callout 4 in the following figure.