Opening The System - IBM N7800 Hardware And Service Manual

If your system uses...
AC power
DC power
Shutting down the node in a stand-alone system
For a node that is not configured with a high-availability (HA) partner, you must
perform a clean shutdown (ensuring that all data has been written to disk) and
disconnect the power supplies.
Procedure
1. Enter the following command from the system console:
If your system is configured in...
7-Mode
Cluster-Mode
After you issue the command, wait until the system stops at the LOADER
prompt.
Attention: You must perform a clean system shutdown before replacing
system components to avoid losing unwritten data in the NVRAM. The
NVRAM adapter has a red LED that blinks if there is unwritten data in the
NVRAM. If this LED is flashing red after you enter the halt local command,
reboot your system and try halting it again.
2. If you are not already grounded, properly ground yourself.
3. Turn off the power supplies and unplug both power cords from the power
source:
If your system uses...
AC power
DC power

Opening the system

To access components inside the motherboard tray, you must open the system.
Procedure
1. If you are not already grounded, properly ground yourself.
2. Unplug the system cables and SFPs from the motherboard tray, as needed, and
keep track of where the cables were connected. Leave the cables in the cable
clips of the cable management tray so that when you reinstall the cable
management tray, the cables are already aligned.
3. Grasp the cable management tray by the side, gently push on the sides of the
tray to unhook it, and then pull the tray off the back of the motherboard tray
and set it aside.
Then...
Unplug the power cords from the power
source, and then remove the power cords.
Remove the power at the DC source, and
then remove the DC wires, if necessary.
Then issue this command...
halt
halt local
Then...
Unplug the power cords from the power
source, and then remove the power cords.
Remove the power at the DC source, and
then remove the DC wires, if necessary.
Chapter 5. Replacing N7000 series system devices
67