Light Path Diagnostics - IBM 866631Y - Netfinity 7100 - 8666 Hardware Maintenance Manual

LEDs.

Light path diagnostics

You can use the light path diagnostics built into the server to quickly identify the
type of system error that occurred. Your server is designed so that LEDs remain
illuminated when the server shuts down, as long as the power supplies are
operating properly. This feature helps you to isolate the problem if an error causes
the server to shut down.
If the system error LED (on the information LED panel) is not lit and no
diagnostics panel LEDs are lit, it means that the light path diagnostics have not
detected a system error.
If the system error LED (on the information LED panel) is lit, it means that a
system error was detected. Check to see which of the LEDs on the diagnostics
panel inside the server are lit and refer to the following table:
Table 1. Light path diagnostics
LED Cause
None The system error log is 75% or
more full; a PFA alert was
logged; or a failure occurred
on the I2C bus.
SMI A systems management event
occurred.
NMI A nonmaskable interrupt
occurred. The PCIA, PCIB, or
PCIC LED will probably also
be on.
SP The service processor has
failed.
SP PCIA PCIB PCIC
SMI NMI
DASD1 CPU
MEM VRM FAN TEMP
NON OVER PS1 PS2 PS3 PS4
RED SPEC
Action
Check the system error log and correct any
problems. See "Choices available from the
Configuration/Setup main menu" on page 31
for information about clearing the error log.
Disconnecting the server from all power
sources for at least 20 seconds will turn off
the system error LED.
Restart the server.
1. If the PCIA, PCIB, or PCIC LED is not on,
restart the server.
If the problem persists, try to determine the
failing adapter by removing one adapter at a
time and restarting the server after each
adapter is removed.
1. Run service processor diagnostics.
2. Replace Legacy I/O board.
17
Diagnostics