Removing The Chassis Top Cover - HP Integrity MC990 X User Manual

Procedure
1. Turn each of the PDU circuit breaker switches to the (On) position.
2. Power up the system. If you are not familiar with the proper power-up procedure, review the section
Powering the system up and down on page 16.
3. Verify that the LEDs on the system power supplies and system front components turn on and
illuminate green which indicates that the power-up procedure is proceeding properly.
If your system does not boot correctly, see Integrity MC990 X system Troubleshooting on page 50,
for troubleshooting procedures.

Removing the chassis top cover

About this task
IMPORTANT:
The MC990 X server chassis cover should not be removed while the Integrity MC990 X system is
powered up.
As shown in Figure 12: MC990 X server chassis cover removal on page 42, the MC990 X server
chassis top is a two-piece bifurcated front and rear chassis cover. The top cover does not need to be
removed for system disk replacement, power supply maintenance, or system fan remove/replace. Other
service actions require that you remove the front chassis cover.
To remove an MC990 X server chassis cover, use a T10 Torx screwdriver with the following instructions:
Procedure
1. Power down the chassis by turning off the PDUs providing power to the unit or by disconnecting all
power supply cords from the chassis rear (or both).
2. Remove the front panel (bezel) by grasping at either end and pulling it off.
3. In a multichassis system, you may need to remove the NUMAlink connector cables from the front of
the unit. Be sure they are labeled for proper reinstallation.
4. Ensure that all other rack-mounted enclosures are in place and pull the chassis out the front.
5. Using the Torx screwdriver, remove the three front retaining screws from the top cover and carefully
set them aside for reinstallation after completion of the procedure.
6. Grasp the front cover and slide it forward and upward from the chassis.
CAUTION:
Always reinstall the chassis cover after you have accessed any internal components to ensure
proper airflow and cooling for the system. Failure to reinstall the cover may cause thermal over-
temperature conditions and automatic shut-down of the chassis.
Removing the chassis top cover 41