IBM 79463AU, Installation And User Manual

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Table 2. 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
See Chapter 3, "Parts listing", in the Problem Determination and Service Guide to determine which
components are customer replaceable units (CRU) and which components are field replaceable units
(FRU).
v
If a action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
LED Description Action
OVER SPEC
(Continued) If the 12 V channel D error LED is lit, complete the following
steps:
1. Turn off the server and disconnect the power from the
server.
2. Remove the microprocessor in socket 1.
Note: The server will not power-on when the
microprocessor in socket 1 or 2 is not installed in the
server. Do the following, depending on the level of your
system board:
v
For the pass 8 level system board , (trained service
technician only) toggle the switch block (SW4), bit 8 to
allow the server to power-on. See Table 5 on page 40
for the location of the SW4 switch block on the pass 8
level system board.
v
For the pass 9 level system board , (trained service
technician only) toggle the switch block (SW4), bit 3 to
allow the server to power-on. See Table 8 on page 43
for the location of the SW4 switch block on the pass 9
level system board.
3. Restart the server to see whether the problem remains.
4. Reinstall the microprocessor in socket 1 and restart the
server.
5. Replace any failing device.
6. (Trained service technician only) Replace the system
board.
(Continued on the next page.)
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IBM System x3550 M2 Types 4198 and 7946: Installation and User’s Guide