2-20 SPARC Enterprise M4000/M5000 Servers Service Manual • December 2010
Power supply unit
(PSU)
READY On (green) Indicates that the power is turned on and being
supplied.
Blinking (green) Indicates that the power is being supplied to the
power supply unit, but the power supply unit is
not turned on.
Off Indicates that power is not being supplied to the
power supply unit.
CHECK On (amber) Indicates that an error occurred in the power
supply unit.
Off Indicates the normal state of the power supply
unit.
LED_AC On (green) Power supply unit has AC applied and is
supplying 12V.
Off Indicates that AC is out of the specified
operating range and 12V is not being supplied
from the power supply unit.
LED_DC On (green) Power supply unit has AC applied and is
supplying 48V. Standby pinhole provides a
manual backup to turn off 48V power.
Off Indicates that 48V is not being supplied from
the power supply unit.
Fan ATTENTION On (amber) Indicates that an error occurred.
Blinking (amber) Indicates that the fan is a target device for
replacement.
TABLE 2-11 Component LED Descriptions (Continued)
Component LED Type LED Display Meaning
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