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Chapter 21 Sensor Unit Replacement 21-5
The procedure is as follows.
1. Unlock and open a door of the server.
For details, see Chapter 5.
Caution – Before touching FRU or the dummy (filler) unit, see Section 1.4,
“Antistatic Precautions” on page 1-6 and be sure to wear the antistatic wrist strap.
Failure to do so might result in serious damage to operating domains.
2. Change the mode switch setting on the operator panel from Locked to Service.
Note – When the maintenance work is completed, be sure to confirm the mode
switch setting and return the switch to Locked.
3. Stop (turn off power) all domains together. Take either of the following two
actions:
■ Press and hold the POWER switch on the operator panel for at least four
seconds.
■ From a console that is connected to XSCF, log in to XSCF, and execute the
poweroff -a command.
The OS shutdown processing is executed for all the domains, and then the
power-off processing is executed.
4. Confirm that the power-off processing is completed by confirming that the
POWER LED (green) on the operator panel is off.
5. Switch off all main line switches for the AC section (ACS) in the power supply
system.
For details, see Section 4.5.3, “Main Line Switch Locations” on page 4-27.
Note – If the optional three-phase 200 VAC input power supply unit is installed, the
main line switches are located on the three-phase ACS.
Caution – If the dual power feed option is installed, switch off the main line
switches for both power supply units.
Caution – After stopping all the domains, be sure to switch off the main line
switches in the power supply system to completely shut off the supply of power.