NEC NF2300-SR412E User Manual page 122

(4) With the ejector pulled toward you, hold the new power supply for the disk
enclosure with both hands and insert it into the slot.
(5) Push the protrusion (shown in the figure) of the ejector to turn the ejector and push
in the new power supply.
(6) Strongly push the ejector (the part indicated by the arrow in the figure) until the new
power supply for the disk enclosure is inserted firmly, and secure the ejector with the
screw.
When inserting the power supply for the disk enclosure into the disk
enclosure, push it as far as it will go and then secure it with the screws.
Incorrect insertion may cause a power supply failure again.
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