NEC NF2300-SR412E User Manual page 87

(5) Removal of blank panel
Remove the two screws securing the blank panel of the controller, and then remove
the blank panel.
Be sure to keep removed blank panel in the safe place.
After removing an additional control card from the unit, be sure to install a
blank panel into the slot. If using the unit without a blank panel being
installed, cooling effect on the array controller lowers and causes heat
generation. Heat generation increases the failure rate, and at its worst it
may cause data loss.
(6) Installation of additional control card
Install an additional control card in the controller.
reference, place the additional control card in the controller.
Screw holes
69
With the screw holes as
Screw holes