NEC Express5800 series User Manual page 205

Installation
Install the CPU in the following procedure.
1.
Shutdown the CPU Blade that will be removed, and turn off the power of the CPU blade.
2.
Take the CPU blade out from the Blade Assembly Unit.
Refer to the User's Guide of the Blade Assembly Unit.
3.
Put the CPU blade on a clean anti-static sheet.
4.
Remove the two screws fixing the processor air duct.
5.
Raise one side of the processor air duct.
IMPORTANT:
make it contact with any electronic devices on the CPU blade.
Handle the processor air duct carefully so as not to
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