NEC Express5800/R320g-M4 Maintenance Manual page 112

Chapter 1 Maintenance
After Sytem Diagnostics are completed, put back all the hard disk drives, which are removed, to original
locations. And make sure to switch back the primary and secondary CPU/IO modules as they were
before.
8. That would complete System Diagnostics. After reconnecting removed periphery cables, start the sytem.
Remove EXPRESSBUILDER DVD from the drive.
Express5800/R310g-E4, R320g-E4, R320g-M4 Maintenance Guide (Windows)
112

Check the PRIMARY lamp on the front side of CPU/IO module to know
Note
whether it is primary or not (Refer to Chapter 1 (6.1 Error Indication by LED). If
PRIMARY lamp is not lightened up, it is secondary CPU/IO module at present.

If you want to change secondary CPU/IO module into primary CPU/IO module
while the power is not turned on, remove the power cables connected to both
CPU/IO modules. After 30 seconds elapse, connect the power cable to primary
CPU/IO module that you desire. After waiting for enough time (15 seconds or
more), connect the power cable to the other CPU/IO module.
Important Do not start EXPRESSBUILDER while hard disk drives are installed to both
primary and secondary CPU/IO modules.
11. System Diagnostics