Lenovo x3550 M4 Installation And Service Manual page 181
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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.
v Go to the support website at http://www.ibm.com/supportportal/ to check for technical information, hints, tips,
and new device drivers or to submit a request for information.
Symptom
The OVER SPEC LED on the
light path diagnostics panel is
lit, or the Pwr rail 3 error has
been recorded in the IMM
event log.
Action
1. Disconnect the server power cords.
2. Remove the following components if Pwr rail 3 error has been recorded in the
IMM2 event log:
v Optional adapter (if one is present) installed in PCI riser-card assembly 1
v PCI riser-card assembly 1
v ServeRAID SAS/SATA adapter (if one is present)
v DIMMs 1 through 6
3. Restart the server. If the Pwr rail 3 error has been recorded in the IMM event
log again, (trained technician only) replace the system board (see "Removing
the system board" on page 314 and "Replacing the system board" on page
318).
4. Reinstall the components one at a time, in the order shown, restarting the
server each time. If the Pwr rail 3 error has been recorded in the IMM event
log again, the component that you just reinstalled is defective. Replace the
defective component.
v DIMMs 1 through 6 (see "Removing a memory module" on page 228 and
"Installing a memory module" on page 48).
v ServeRAID SAS/SATA adapter (see "Removing a ServeRAID SAS/SATA
controller" on page 245 and "Replacing a ServeRAID SAS/SATA controller"
on page 246).
v PCI riser-card assembly 1 (see "Removing a PCI riser-card assembly" on
page 236 and "Replacing a PCI riser-card assembly" on page 237).
v Optional adapter (if one is present) installed in PCI riser-card assembly 1
(see "Removing an adapter" on page 240 and "Replacing an adapter" on
page 241).
5. Follow actions in "Solving power problems" on page 169, if the OVER SPEC
LED on the light path diagnostics panel is still lit.
6. Replace the power supply if the OVER SPEC LED on the light path diagnostics
panel is still lit.
Chapter 4. Troubleshooting
163
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Table of Contents
Troubleshooting
