NEC BladeServer Express5800 Series User Manual page 235

Removal
To remove the CPU, follow Steps 1 through 6 of the installation procedure and perform Steps 7
through 15 in the reverse order. To remove the heat sink, remove the screws and gently slide it back
and forth to loosen it.
IMPORTANT:
Remove a CPU only when it is defective. After replacing it, select
[Main] – [Processor Settings] – [Processor Retest] in the BIOS
Setup utility and set [Processor Retest] to [Yes] to clear the error
information (see Chapter 4).
After operation, the cool sheet at the bottom of the heat sink may
adhere to the CPU. To remove the heat sink, gently twist or slide it
back and forth to separate it from the CPU. If you remove the heat
sink with the cool sheet adhering to the CPU, the CPU and/or socket
may be damaged.
Put a dust cover on the CPU #2 socket if it is empty.
The CPU blade will not operate if there is no CPU installed in the
CPU #1 socket.
To replace a CPU, the cool sheet should be replaced with a new one.
Contact you service representative.
Upgrading Your Server 9-11