NEC Express5800 Series Maintenance Manual page 135

Chapter 2 Configuring and Upgrading the System
9. Lift the plate.
10. Place the CPU on the socket gently and carefully.
For easy installation, hold edges of CPU with your thumb and index fingers so that the notch is aligned
with the key on the CPU socket.

Be sure to hold the CPU only at the edges.
Important

Pay attention not to touch the bottom of the CPU (pin section).

Note Insert the CPU while aligning the notch on the processor with the key on the CPU
socket.

Bring down the CPU straight without tilting or sliding it in the socket.
Pin mark
Notch
Pin mark
Key
Express5800/R320e-E4, R320e-M4 Maintenance Guide (Linux)
5. Installing and Replacing Optional Devices
135