88 Troubleshooting
Is a connected port’s Network Port link status LED off?
Is the fan control module Fault/Service Required LED amber?
Is the power supply Input Power Source LED off?
Is the Voltage/Fan Fault/Service Required LED amber?
Answer Possible reasons Actions
No System functioning properly. No action required.
Yes The link is down. Use standard networking troubleshooting procedures to isolate
faults on the network.
Table 17 Diagnostics LED status: Rear panel “Network Port Link Status”
Answer Possible reasons Actions
No System functioning properly. No action required.
Yes The power supply unit or a fan is
operating at an unacceptable
voltage/RPM level, or has failed.
When isolating faults in the power supply, remember that the
fans in both modules receive power through a common bus on
the midplane, so if a power supply unit fails, the fans continue
to operate normally.
• Verify that the FCM FRU is firmly locked into position.
• Verify that the power cable is connected to a power source.
• Verify that the power cable is connected to the enclosure’s
power supply unit.
Table 18 Diagnostics LED status: Rear panel fan control module “Fault/Service Required” (4U56)
Answer Possible reasons Actions
No System functioning properly. No action required.
Yes The power supply is not receiving
adequate power.
• Verify that the power cord is properly connected, and check
the power source to which it connects.
• Check that the power supply FRU is firmly locked into
position.
• Check the event log for specific information regarding the
fault.
• If the above action does not resolve the fault, isolate the
fault, and contact an authorized service provider for
assistance.
Table 19 Diagnostics LED status: Rear panel power supply “Input Power Source”
Answer Possible reasons Actions
No System functioning properly. No action required.
Yes The power supply unit or a fan is
operating at an unacceptable
voltage/RPM level, or has failed.
When isolating faults in the power supply, remember that the
fans in both modules receive power through a common bus on
the midplane, so if a power supply unit fails, the fans continue
to operate normally.
• Verify that the power supply FRU is firmly locked into
position.
• Verify that the power cable is connected to a power source.
• Verify that the power cable is connected to the enclosure’s
power supply unit.
Table 20 Diagnostics LED status: Rear panel power supply “Voltage/Fan Fault/Service Required”
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