Light path diagnostics LEDs
The following table describes the LEDs on the light path diagnostics panel and
suggested actions to correct the detected problems.
Note: Check the system-error log or system event log for additional information
before replacing a FRU.
Table 7. Light path diagnostics panel LEDs
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 4, “Parts listing, System x3550 M3 Types 4254 and 7944,” on page 159 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.
LED Description Action
None, but the
system error LED
is lit.
An error has occurred and cannot
be isolated. The error is not
represented by a path.
Use the Setup utility to check the system error log for
information about the error.
OVER SPEC The power supplies are using
more power than their maximum
rating.
If the OVER SPEC LED on the light path diagnostics panel is
lit, or any of the six 12 V channel error LEDs (A, B, C, D, E,
or AUX) on the system board are lit, use one of the following
procedures.
If the 12 V channel A error LED is lit, complete the following
steps:
1. Turn off the server and disconnect the power from the
server.
2. Remove the optical drive, fans, hard disk drives, and hard
disk drive backplane.
3. Restart the server to see whether the problem remains.
4. Reinstall each device that you removed in step 2 one at a
time, starting the server each time, to isolate the failing
device.
5. Replace any failing device.
6. (Trained service technician only) Replace the system
board.
If the 12 V channel B error LED is lit, complete the following
steps:
1. Turn off the server and disconnect the power from the
server.
2. Remove the PCI riser card in connector 1, all DIMMs, and
the microprocessor in socket 2.
3. Restart the server to see whether the problem remains.
4. Reinstall each device that you removed in step 2 one at a
time, starting the server each time, to isolate the failing
device.
5. Replace any failing device.
6. (Trained service technician only) Replace the system
board.
(Continued on the next page)
104 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide
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