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CiscoASR 9000 Series Aggregation Services Router Hardware Installation Guide
Chapter4 Troubleshooting the Installation
Troubleshooting the Power Subsystem
Troubleshooting a DC Power Module
Follow these steps to troubleshoot a DC power module if it is not operating properly.
Step1 Make sure the power module is seated properly by ejecting and reseating the power module. Check that:
•Latch on the door/ejector lever is locked securely.
•Power switch on the power tray is set to the ON (1) position.
Step2 Make sure the router is powered on and that all power cords are connected properly. Check that the:
•Power cables are securely attached to their power module terminal studs.
•Power cables are securely attached at the DC source end.
•Source DC circuit breaker is switched on.
Step3 Check the power supply status LED indicators:
•Input power LED (green)—Indicates that the DC power input is operating normally, and the source
DC input voltage is within the nominal operating range of –40 to –72VDC.
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If the input power LED is blinking, input connections to the power module are loose or not
connected, or the input voltage is below the minimum. Verify that DC power from the source is
operating in the nominal range of –40 to –72VDC.
Note On the DC power tray, the Power Input LED is lit solid green if both DC feeds are valid
and blinks green if only a single DC feed is valid. Check the input connections to the
power module.
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If the indicator is still flashing after you perform the above checks, replace the power module.
•Output power LED (green)—Indicates that the DC power output is operating normally, and the
–54 VDC output voltage to the backplane is within the nominal operating range. This indicator
lights only when the power switch at the rear of the power tray is set to the ON (1) position.
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If the output power LED remains off after checking all the power sources, replace the power
module with a spare. If the spare power module does not work, troubleshoot the power tray in
which the module is plugged.
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If the output power LED is blinking, the power module is in a power limit or overcurrent
condition. Make sure that each power cable is connected to a dedicated DC power source. Verify
that each DC power source is operating in the nominal range of –40 to –72VDC.
1Input power LED ON continuously when the input voltage is present and within the correct range
BLINKING when the input voltage is out of acceptable range
On the DC power tray, the Power Input LED is lit solid green if both DC feeds are
valid and blinks green if only a single DC feed is valid.
OFF when no input voltage is present
2Output power LED ON when the power module output voltage is present
BLINKING when the power module is in a power limit or overcurrent condition
3 Fault LED ON to indicate that a power module failure has occurred