Lenovo System x3550 M4 Installation And Service Manual page 168

• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
• Go to the support website at
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.
The OVER SPEC LED on the
light path diagnostics panel is
lit, or the Pwr rail 4 error has
been recorded in the IMM
event log.
154
Lenovo System x3550 M4 Installation and Service Guide
http://www.lenovo.com/support
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:
• Optional adapter (if one is present) installed in PCI riser-card assembly 1
• PCI riser-card assembly 1
• ServeRAID SAS/SATA adapter (if one is present)
• 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 298 and "Replacing the system board" on page 301).
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.
• DIMMs 1 through 6 (see "Removing a memory module" on page 216 and
"Installing a memory module" on page 217).
• ServeRAID SAS/SATA adapter (see "Removing a ServeRAID SAS/SATA
controller" on page 231 and "Replacing a ServeRAID SAS/SATA controller"
on page 233).
• PCI riser-card assembly 1 (see "Removing a PCI riser-card assembly" on
page 223 and "Replacing a PCI riser-card assembly" on page 224).
• Optional adapter (if one is present) installed in PCI riser-card assembly 1 (see
"Removing an adapter" on page 227 and "Replacing an adapter" on page
228).
5. Follow actions in "Solving power problems" on page 159, 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.
1. Disconnect the server power cords.
2. Remove the following components if the Pwr rail 4 error has been recorded in
the IMM event log:
• Optional PCI adapter power cable (if one is present)
• Fan 1
• Fan 2
• Hard disk drives
• DIMMs 7 through 12
3. Restart the server. If the Pwr rail 4 error has been recorded in the IMM event log
again, (trained technician only) replace the system board (see "Removing the
system board" on page 298 and "Replacing the system board" on page 301).
4. Reinstall the components one at a time, in the order shown, restarting the server
each time. If the Pwr Rail 4 error has been recorded in the IMM event log again,
to check for technical information, hints, tips,