Table 7. 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.
When both the CPU LED and the
CONFIG LED are lit, the
microprocessor configuration is
invalid.
1. If the CONFIG LED is not lit, a microprocessor failure
occurs, complete the following steps:
a. (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 “Installing a microprocessor and heat
sink” on page 282 for information about installation
and requirements.
b. (Trained technician only) Replace the failing
microprocessor (see “Removing a microprocessor and
heat sink” on page 279 and “Installing a
microprocessor and heat sink” on page 282).
c. For more information, go to http://www.ibm.com/
systems/support/supportsite.wss/
docdisplay?brandind=5000008&lndocid=SERV-CALL.
2. 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:
a. Check the microprocessors that were just installed to
make sure that they are compatible with each other
(see “Installing a microprocessor and heat sink” on
page 282 for additional information about
microprocessor requirements).
b. (Trained technician only) Replace the incompatible
microprocessor.
c. Check the system-error logs for information about the
error. Replace any component that is identified in the
error log.
132 IBM System x3650 M4 Type 7915: Problem Determination and Service Guide
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