3-28
Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
CPU Replacement Procedure
Caution CPUs and their motherboard sockets are fragile and must be handled with care to avoid damaging pins
during installation. The CPUs must be installed with heatsinks and their thermal pads to ensure proper
cooling. Failure to install a CPU correctly might result in damage to the server.
Caution The Pick-and-Place tools used in this procedure are required to prevent damage to the contact pins
between the motherboard and the CPU. Do not attempt this procedure without the required tools, which
are included with each CPU option kit. If you do not have the tool, you can order a spare (Cisco PID
UCS-CPU-EP-PNP).
To install or replace a CPU heatsink and CPU, follow these steps:
Step 1 Prepare the server for replacement:
a. Power off the server as described in Shutting Down and Powering Off the Server, page 3-8.
b. Slide the server out the front of the rack far enough so that you can remove the top cover. You might
have to detach cables from the rear panel to provide clearance.
Caution If you cannot safely view and access the component, remove the server from the rack.
c. Remove the top cover as described in Removing and Replacing the Server Top Cover, page 3-9.
d. Remove the internal air baffle that covers the CPU sockets.
Step 2 Use a Number 2 Phillips-head screwdriver to loosen the four captive screws that secure the heatsink and
lift it off of the CPU.
Note Loosen each screw evenly to avoid damaging the heatsink or CPU.
Step 3 Unclip the first CPU retaining latch that is labeled with the icon, and then unclip the second
retaining latch that is labeled with the icon. See Figure 3-14.
Step 4 Open the hinged CPU cover plate. See Figure 3-14.
