Sun Microsystems Netra CT 410, Service Manual

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Chapter 4 Troubleshooting the System 4-19
4.6.2 Troubleshooting the Power Supply Units in the
Netra CT 810 Server
When both power supply units in a Netra CT 810 server are up and running
properly, the green (
)LEDs on both power supply units is ON (note that these are
the LEDs on the power supply units themselves, not the LEDs on the system status
panel).
If a power supply unit fails, the amber ( ) LED on the power supply unit might
light, depending on the type of failure that occurs:
■
If a soft-fault occurs, such as a stuck fan or a temperature warning, a notification
of the error is given; however, the amber ( ) LED on the power supply unit
does not light for a soft-fault condition. The power supply unit is still supplying
power to the system during a soft-fault condition.
■
If a hard-fault occurs, such as a voltage problem, a notification of the error is
given. In addition, the amber ( ) LED on the power supply unit does light for a
hard-fault condition. The power supply unit does not supply power to the system
during a hard-fault condition.
If one power supply unit fails (either a soft-fault or a hard-fault), but the other
power supply unit is still functioning normally, replace the faulty power supply unit
as soon as possible. If both power supply units fail, the action to take varies
depending on which of the two types of faults occurred:
If Then
Both power supply units go through a soft-fault Replace one power supply unit at a time, in
order to keep the system up and running.
One power supply unit goes through a soft-fault
and the other power supply unit goes through
a
hard-fault
Replace the power supply unit that has a
hard-fault first, in order to keep the system
up and running.
Both power supply units go through a hard-fault The system is down. Replace at least one of
the power supply units to bring the system
back up again.