NEC S2900 User Manual page 70

(5) Removal of blank panel and seal for the DPE connector cover
Remove the three screws securing the blank panel of the controller, and then remove the blank panel.
In addition, remove the U-shaped seal attached to the upper part of the DPE stack connector.
Be sure to keep removed blank panel in a safe place.
After removing a DE port from the unit, be sure to install a blank panel into the
slot. If using the unit without a blank panel being installed, the 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.
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