NEC MH4500 - Manual (Page 74)

4-4 Upgrading Your System
Removing the Access Cover
To install options in your system, you must first remove the access cover on the
right side of the system (as viewed from the front).
!
CAUTION
For proper cooling and airflow, do not operate the system
with the access cover removed. Always replace the cover
before powering on the system.
!
WARNING
Turn off your system, disconnect any external devices, and
unplug the system power cords from the AC wall outlet
before removing the access cover.
Remove the access cover as follows.
1. Power off the system and unplug the power cables from the AC wall outlets.
If connected to a surge protector or uninterruptible power source, unplug
from the AC outlet.
2. Disconnect all external devices and unplug all device cables.
3. Remove the two Phillips head screws securing the cover to the back of the
chassis (see the following figure). Save the screws for reattaching the cover.
4. Grasp the built-in handle on the back of the access cover. You might also
want to grasp the front handle of the access cover. The front handle is a
rounded, rectangular depression in the front middle of the cover.
Note: The access cover fits tightly to the chassis. Use
two hands to remove the cover.
5. Slide the access cover toward the back of the chassis until it stops (about an
inch). This unlocks the locking fingers behind the access cover.
6. Pull the access cover straight away from the chassis to disengage the locking
tabs. Set the access cover aside.