Table 14. Light path diagnostics panel LEDs (continued)
v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v If an action step is preceded by "(trained technician only)," that step must be performed only by a trained
technician.
LED Description Action
CPU When only the CPU LED is lit, a
microprocessor has failed.
If the CONFIG LED is not lit, a microprocessor failure occurs,
complete the following steps:
1. (Trained technician only) Make sure that the failing
microprocessor and its heat sink, which are indicated by a
lit LED on the system board, are installed correctly. See
“Replacing a microprocessor and heat sink” on page 315
for information about installation and requirements.
2. (Trained technician only) Replace the failing
microprocessor (see “Removing a microprocessor and heat
sink” on page 310 and “Replacing a microprocessor and
heat sink” on page 315).
3. For more information, go to http://www.ibm.com/
support/entry/portal/docdisplay?lndocid=SERV-CALL.
CPU + CONFIG
When both the CPU LED and the
CONFIG LED are lit, the
microprocessor configuration is
invalid.
If the CONFIG LED and the CPU LED are lit, the system
issues an invalid microprocessor configuration error.
Complete the following steps to correct the problem:
1. Check the microprocessors that were just installed to
make sure that they are compatible with each other (see
“Replacing a microprocessor and heat sink” on page 315
for additional information about microprocessor
requirements).
2. (Trained technician only) Replace the incompatible
microprocessor.
3. Check the system-error logs for information about the
error. Replace any component that is identified in the
error log.
Chapter 4. Troubleshooting 139
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