Removing and Replacing the Fan Trays
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
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•If the INPUT OK LED goes on, proceed to Step4.
•If the INPUT OK LED does not go on after you apply power to the unit and
verify the conditions outlined in Step1, contact your local Cisco service
representative for assistance.
Step4 Observe the behavior of the red OUTPUT FAIL LED on the power supply
faceplate after applying power to the unit. This LED should flash on
momentarily, then go off and remain so.
•If the OUTPUT FAIL LED on the new power supply behaves as expected,
proceed with normal system operations.
•If the OUTPUT FAIL LED remains on when the new power supply is
installed and powered up, the power supply may be faulty, or an adverse
environmental condition may exist in the router, such as an overvoltage or
overtemperature condition that causes the power supply to shut down.
•If two power supplies are installed and the OUTPUT FAIL LED on only one
power supply goes on, you can assume that the power supply itself is faulty,
or that the DC source for that power supply is faulty.
•If the OUTPUT FAIL LEDs on both power supplies go on, each of which is
connected to a separate DC power source, you can assume that an
overvoltage or overtemperature condition in the router is causing both power
supplies to fail. Also, the OUTPUT FAIL LEDs could be on due to a
defective MBus controller or an old version of MBus code.
If the new DC-input power supply fails to operate properly after several attempts to power
it up as described above, contact your Cisco service representative for assistance.
Removing and Replacing the Fan Trays
This section presents the procedures for removing and installing the following fan trays
incorporated into the Cisco 12008:
•Card cage fan tray—Located in the lower card cage behind the air filter assembly
•Power supply fan tray—Located in the lower right corner of the router enclosure