Light Path Diagnostics Leds - IBM xSeries 455 Installation Manual

Light path diagnostics LEDs

The following table lists the LEDs on the light path diagnostics panel, the problems
that they indicate, and actions to solve the problems.
Table 4. Light path diagnostics
LED Problem
None An error has occurred and cannot be
diagnosed, or the ASM processor has failed.
The error is not represented by a Light Path
Diagnostic LED.
CPU A microprocessor has failed.
MEMORY A memory error occurred.
DASD A hard disk drive error occurred.
PCI-X BUS An error occurred on a PCI bus.
FAN A fan has failed or is operating too slowly.
A failing fan can also cause the TEMP LED to
be lit.
TEMP The system temperature has exceeded a
threshold level.
NMI A machine check abort error has occurred.
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xSeries 455: Installation Guide
Action
Check the system error log for more
information about the error.
v Check the microprocessor failure LEDs on
the system board.
Note: If you have installed more than one
microprocessor, check the reverse side of
the processor board for lit microprocessor
failure LEDs.
v If a microprocessor error LED is lit, make
sure that the microprocessor is installed
correctly. See "Installing and replacing a
microprocessor and power module" on
page 13 for installation instructions.
If the problem remains, call for service.
v Check the DIMM failure LEDs on the
memory board.
v Replace the DIMM indicated by the lit DIMM
failure LED.
Check the LEDs on the hard disk drives and
replace the indicated drive.
v Check the error log for additional
information.
v If you cannot isolate the failing adapter from
the information in the error log, try to
determine the failing adapter by removing
one adapter at a time from the failing PCI-X
bus and restarting the server after each
adapter is removed.
If the problem remains, call for service.
Check the LEDs on the fans and replace the
indicated fan.
v Determine whether a fan has failed. If it has,
replace it.
v Make sure that air vents are not blocked.
v Make sure that the room temperature is not
too high. (See "Features and specifications"
on page 4 for temperature information.)
If the problem remains, call for service.
Check the error log to identify the condition.