NEC Express5800 Series EXP320B - Manual (Page 326)

8-14 System Upgrade
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Installing 5.25-inch Device
1. See page 8-4 to prepare for installation.
2. Loosen screws to remove the side cover.
3. Loosen screws to remove the tray for adding devices.
4. Remove the four screws securing the dummy cover,
and remove the dummy cover.