Sun Microsystems Sun Fire E25K Service Manual page 51

3. Shut down the System Control boards by doing the following:
As a superuser on the spare SC, shut down the spare SC by typing:
I
sc_spare# shutdown -y -g seconds -i 0
where seconds is the amount of time before shutdown.
On the main SC, power off the spare SC by typing:
I
sc% poweroff SCx
where x is 0 or 1, dependent upon which SC is the spare.
As a superuser on the main SC, shutdown the main SC by typing:
I
sc# shutdown -y -g seconds -i 0
where seconds is the amount of time before shutdown.
4. Open the Sun Fire E25K/E20K system cabinet access doors.
Note – All DC circuit breakers are to remain in the on position at all times.
5. Power off the AC0 and AC1 circuit breakers for all power supplies in the system.
Note – Observe the following warning message displayed at the right side of the
circuit breakers on the circuit breaker panel above the AC power supplies:
WARNING
FAN TRAYS HAVE REDUNDANT DC POWER SOURCES.
CIRCUIT BREAKERS ON BOTH SIDES, FRONT AND REAR,
MUST BE OPERATED TO TURN OFF FAN TRAYS.
POWER SUPPLIES HAVE DUAL AC INPUTS.
BOTH CIRCUIT BREAKERS, AC0 AND AC1 MUST BE
OPERATED TO TURN OFF A POWER SUPPLY.
Chapter 3 System Power 3-3