NEC Express 5800/320Lb - Manual (Page 266)

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Installation
Follow the steps below to mount a CPU:
62. Shut down OS.
Press the POWER switch to turn off the server.
63. Unplug the power cord.
64. Remove the CPU module.
65. Detach the CPU air duct.
66. Check to be sure of the location of the CPU socket.
67. Remove the anti-dust sheet from the socket.
IMPORTANT: Carefully keep the removed sheet.
68. Lift the socket lever.
IMPORTANT: Open the lever fully. It can be opened 120° or more.