NEC MH4500 - Manual (Page 76)

4-6 Upgrading Your System
Opening the Subchassis and Electronics Bay
There may be times during system upgrade that you need to open the subchassis
and electronics bay. Both may be swung aside for access to components.
Open the subchassis and electronics bay as follows.
!
CAUTION
For proper cooling and airflow, do not operate the system
with the access cover removed, the subchassis open, and
the electronics bay open. Always replace the cover and
close the subchassis and electronics bay before powering
on the system.
!
WARNING
Turn off your system, disconnect any external devices, and
unplug the system power cords from the AC wall outlets
before removing the access cover, opening the subchassis,
and opening the electronics bay.
Open the subchassis and electronics bay as follows.
1. Power off the system and unplug the power cables from the AC wall outlets.
If connected to a surge protector or an uninterruptible power supply, unplug
from the AC outlet.
2. Disconnect all external devices and unplug all device cables.
3. Remove the access cover as previously described.
!
CAUTION
All cabling to the I/O panel on the back of the system must
be disconnected before opening the electronics bay. Failure
to disconnect all cabling to the bay can result in serious
damage to system components.
4. Label and disconnect all peripheral cables attached to the I/O panel on the
back of the system (D in the following figure).
5. Remove the two screws on the top and bottom edges of the chassis that
secure the subchassis and electronics bay (see A in the following figure).