IBM 79463AU Installation And User Manual page 35

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
OVER SPEC The power supplies are using
(Continued) more power than their maximum
rating.
Action
If the 12 V channel C error LED is lit, complete the following
steps:
1. Turn off the server and disconnect the power from the
server.
2. Remove the SAS/SATA RAID riser card, DIMMs in
connectors 1 through 8, and 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 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.)
Chapter 1. The System x3550 M2 server
19