Removing And Replacing The Dc Power Supply - Cisco ASR 903 Installation Manual

Installing the Cisco ASR 903 Router
If the LEDs indicate a power problem, see Troubleshooting.
If you are installing a redundant DC power supply, ensure that each power supply is connected to a separate power source
in order to prevent power loss in the event of a power failure.
If you are installing a redundant DC power supply, repeat these steps for the second power source.

Removing and Replacing the DC Power Supply

This section provides information about removing and replacing the DC power supply in the Cisco ASR 903
Router.
Note
The Cisco ASR 903 Router power supplies are hot-swappable. If you have installed redundant power supply
modules, you can replace a single power supply without interrupting power to the router.
Caution To avoid erroneous failure messages, allow at least 2 minutes for the system to reinitialize after a power supply
has been removed or replaced.
Follow these steps to remove and replace the DC power supply on the Cisco ASR 903 Router:
Step 1
Verify the circuit breaker connected to the power supply that has to be replaced.
Step 2 Before servicing the power supply, switch off the circuit breaker in your equipment area. As an additional precaution,
tape the circuit-breaker switch in the Off position.
Step 3 Slip on the ESD-preventive wrist strap that was included in the accessory kit.
The power supplies are not fed by both power units. Shutting off the incorrect power supply may cause a
Note
traffic outage.
Step 4
Measure the DC voltage on the failed power supply input, thus ensuring that the correct unit has been powered off.
Step 5 Loosen the captive screws on the DC power supply.
Step 6
Grasping the power supply handle with one hand, pull the power supply out from the chassis while supporting it with
the other hand.
Step 7
Remove the lugs from the PSU.
Step 8 Replace the new DC PSU and connect the DC leads to the power supply as before
Step 9
Turn on the circuit breaker or the reinstall the fuse.
Step 10 Verify the power supply by checking if the front panel LEDs are as below:
• Input OK LED is green
• Output FAIL LED is green
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
Removing and Replacing the DC Power Supply
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