NEC POWERMATE PROFESSIONAL 9000 Service Manual page 159

3-6 Option Installation
3. Slide the cover forward to meet the front panel.
4. Secure the cover with the three screws (see "Removing the Covers").
5. If you have a Kensington Security Standard connector or other chassis lock,
reconnect it to the chassis.
Reconnect all external peripherals.
6.
Plug in the system power cables.
7.
Repeat this procedure if the other cover must be replaced.
Figure 3-4 Replacing a Cover
NOTE: The cover fits tightly. If the cover does
not slide all the way to the front panel, make sure
that the tabs along the top, back, and bottom of
the cover are aligned with the notches and rails in
the chassis.