3-14 Sun Fire X4450 Server Service Manual • November 2009
3.4 Servicing Power Supplies
Some versions of the Sun Fire X4450 servers are equipped with redundant
hot-swappable power supplies. Redundant power supplies enable you to remove
and replace a power supply without shutting the server down, provided that the
other power supply is online and working.
If a power supply fails and you do not have a replacement available, leave the failed
power supply installed to ensure proper air flow in the server.
The following topics are covered:
■ Section 3.4.1, “Detecting Power Supply Failure” on page 3-15
■ Section 3.4.2, “Power Supply LED Reference” on page 3-16
■ Section 3.4.3, “Removing a Power Supply” on page 3-17
■ Section 3.4.4, “Installing a Power Supply” on page 3-19
Note – This is a customer-replaceable unit.
3.4.1 Detecting Power Supply Failure
The following LEDs are lit when a power supply fault is detected:
■ Front and rear Service Required LEDs
■ Rear PS Failure LED on the bezel of the server
■ Failure LED on the faulty power supply
See Section 3.4.2, “Power Supply LED Reference” on page 3-16 for power supply LED
information.
See Section 1.3, “Sun Fire X4450 Server Front Panel Features” on page 1-6 and
Section 1.4, “Sun Fire X4450 Server Rear Panel Features” on page 1-7 for more
information about identifying and interpreting system LEDs.
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