NEC Express5800 Series EXP320B - Manual (Page 338)

8-26 System Upgrade
Installing CPU (Model with Heat Sink)
Follow the steps below to mount a CPU.
Information provided here is for the 320Fa-L and 320Fa-LR models, which have a heat sink installed.
1. Shut down OS.
The system turns off automatically.
2. Unplug the power cords.
3. Remove the CPU/IO module referring to page 8-17.
4. Remove the cable to remove the cooling fan unit.
Cable
Cooling fan unit
5. Check to be sure of the location of the CPU socket.
6. Detach the socket cover on the CPU socket.
IMPORTANT:
Keep the socket cover.
7. Lift the socket lever. ᴾ
IMPORTANT:
Open the lever fully. It can be opened 120° or more.