IBM 8682 - Eserver xSeries 350, Hardware Maintenance Manual

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Notes:
1. The server does not support replaceable voltage regulator modules (VRMs).
2. The server supports a maximum of three PCI buses.
3. The server supports a maximum of three power supplies.
Light Path Diagnostics
You can use the light path diagnostics built into the server to quickly identify the
type of system error that occurred. The 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 on Cause
None
1. The system error log is 75% or more full or a PFA alert was logged. (See “Diagnostic panel error
LEDs” on page 101)
2. Bad, missing, or mis-installed processor terminator.
CPU One of the microprocessors has failed. (See “Diagnostic panel error LEDs” on page 101)
Memory A memory error occurred. (See “Diagnostic panel error LEDs” on page 101)
PCIA An error occurred on PCI bus A. An adapter in PCI slot 1, or the system board, caused the error.
(See “Diagnostic panel error LEDs” on page 101)
PCIB An error occurred on PCI bus B. An adapter in PCI slot 2, 3, or 4, or the system board, caused the
error. (See “Diagnostic panel error LEDs” on page 101)
PCIC An error occurred on PCI bus C. An adapter in PCI slot 5 or 6, or the system board, caused the
error. (See “Diagnostic panel error LEDs” on page 101)
PCID Not implemented at this time.
PS1 The first power supply has failed. (See “Diagnostic panel error LEDs” on page 101)
PS2 The second power supply has failed. (See “Diagnostic panel error LEDs” on page 101)
PS3 The third power supply has failed. (See “Diagnostic panel error LEDs” on page 101)
Fan One of the fan assemblies has failed or is operating too slowly.
Note: A failing fan can also cause the TEMP and/or DASD LEDs to be on; see “Diagnostic panel
error LEDs” on page 101.
DASD A hot-swap hard disk drive has failed on SCSI channel B (see “Diagnostic panel error LEDs” on
page 101).
NMI A nonmaskable interrupt occurred. (The PCIA, PCIB, PCIC, or Memory LED will probably also be
on; see “Diagnostic panel error LEDs” on page 101.)
Note: The NMI LED can only be reset by completely removing power from system.
SP The service processor has failed. (See “Diagnostic panel error LEDs” on page 101)
Event Log Not implemented at this time.
Non Red System is operating in non-redundant power mode. (See “Diagnostic panel error LEDs” on
page 101)
Diagnostics
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