Sun Oracle 4540 - Phaser Copystation, Service Manual, Page: 248 / 264

E-4 Sun Fire X4500/X4540 Server Service Manual • May 2010
E.2 Power-Off Sequence
A power-off sequence is initiated by a request from the SP board management
controller, an OS-level shutdown, a power button press, or a fault condition.
A power supply fault (main or voltage converter) or a thermal event (THERMTRIP)
can trigger a hardware-level shutdown.
FIGURE E-2
shows the power-off sequence.
TABLE E-2
defines the symbols used in the
diagram and describes the power-off sequence timing parameters.