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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. (See Chapter 5)
Caution – Before touching a FRU or dummy (filler) unit, see Section 1.4, “Antistatic
Precautions” on page 1-9 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. Use one of the following methods to stop (power off) all domains at once.
■ 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. (See Section 4.5.3, “Main Line Switch Locations” on page 4-30)
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.
Note – 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.
6. Connect the clip of the antistatic wrist strap and of the antistatic mat to the server
grounding port. (See Section 1.4, “Antistatic Precautions” on page 1-9)