Lenovo ThinkSystem SR850, Maintenance Manual

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• If the green activity LED is flashing and the yellow status LED is lit, replace the drive. If the activity of
the LEDs remain the same, go to step
5. If the activity of the LEDs changes, return to step 1. 5. Make sure that a drive backplane is present to
install the drive into.
6. Make sure that the drive backplane is correctly seated. When it is correctly seated, the drive assemblies
would be correctly connected to the backplane without bowing or causing movement of the backplane.
7. Reseat the backplane power cable and repeat step 1 to step 3.
8. Reseat the backplane signal cable and repeat step 1 to sept 3.
9. Suspect the backplane signal cable or the backplane:
a. Replace the affected backplane signal cable.
b. Replace the affected backplane.
10. (Trained service technician only) replace the system board.
Drive(s) installed in the server are not detected by SAS controller
Complete the following steps until the problem is solved:
1. Verify if the drives are supported for this server. See the ServerProven web site at http://www.lenovo.
com/serverproven/ for a list of supported drives.
2. Check the XCC event log, resolve drive related errors is found any.
3. Make sure that the drives are seated correctly, the SAS signal cables are securely connected, the
backplane cables are securely connected to the backplanes, and the RAID adapter is configured
correctly.
4. If the problem remains:
a. Reseat the backplane(s), SAS signal cable(s), and backplane power cable(s).
b. Restart the server.
Fan problems
Use this information to resolve issues related the to fans.
• “Abnormally high RPM (revolutions per minute)” on page 146
Abnormally high RPM (revolutions per minute)
Complete the following steps until the problem is solved.
1. Check to see if the system inlet perforation or heatsinks are clogged.
2. Make sure that all air baffles are correctly installed in the server.
3. Check the thermal grease on the processor, and make sure it's not contaminated.
Intermittent problems
Use this information to solve intermittent problems.
• “Intermittent external device problems” on page 146
• “Intermittent KVM problems” on page 147
• “Intermittent unexpected reboots” on page 147
Intermittent external device problems
Complete the following steps until the problem is solved.
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ThinkSystem SR850 Maintenance Manual