Power-Supply Leds - IBM System x3550 Type 7978 Problem Determination And Service Manual

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, Type 7978 and 1913 server," on page 89 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Lit light path
diagnostics LED with
the system-error or
information LED also
lit Description
TEMP The system temperature has exceeded
a threshold level.
RAID A RAID controller error has occurred.
PCI An error has occurred on a PCI bus or
on the system board. An additional LED
will be lit next to a failing PCI slot.

Power-supply LEDs

The following minimum configuration is required for the DC LED on the power
supply to be lit:
v Power supply
v Power backplane
v Power cord
The following minimum configuration is required for the server to start:
v One microprocessor in microprocessor socket 1
v Two 512 MB DIMMs on the system board
v One power supply
v Power backplane
v Power cord
v Five cooling fans
The following illustration shows the locations of the power-supply LEDs.
60
IBM System x3550 Type 7978 and 1913: Problem Determination and Service Guide
Action
v Determine whether a fan has failed. If it has,
replace it.
v Make sure that the room temperature is not too
high. See "Features and specifications" on page
3 for temperature information.
v Make sure that the air vents are not blocked.
Check the system error log for information about
the error. If an optional RAID controller is installed,
see the documentation that comes with the RAID
controller.
v Check the LEDs at the PCI slots to identify the
component that is causing the error.
v Check that the PCI riser assemblies are seated
correctly.
v Check the system error log for information about
the error.
v If you cannot isolate the failing adapter through
the LEDs and the information in the system error
log, remove one adapter at a time from the
failing PCI bus, and restart the server after each
adapter is removed.