NEC Express5800 Series EXP320B - Manual (Page 342)

8-30 System Upgrade
Replacing CPU
Follow the steps below to replace a failed CPU:
1. Use Data Viewer of NEC ESMPRO Manager to identify the failed CPU.
2. Remove the CPU/IO module referring to page 8-17.
3. Replace the CPU.
4. Install the CPU/IO module referring to page 8-19.
The installed CPU/IO module will start automatically.