Cisco ASR 1004 - Manual (Page 32)

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Step 5 The power supply LEDs light when power is supplied to the router.
You have completed a live change-out procedure (that is, removing and replacing an AC power supply) for an AC
power supply not operating properly in the Cisco ASR 1004 Router within five minutes
Remove and Then Replace a DC Power Supply
Because of the power supply redundancy, there is no need to power off the Cisco ASR 1004 Router before removing one of the
DC power supplies.
Warning Before performing any of the following procedures, ensure that power is removed from the DC circuit. Statement
1003
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment.
Statement 1030
Warning Installation of the equipment must comply with local and national electrical codes. Statement 1074
Step 1 Before servicing the power supply, switch the circuit breaker Off in your equipment area.
Step 2 Slip on the ESD-preventative wrist strap that was included in the accessory kit.
Step 3 Switch the power supply circuit breaker switch to Off (O).
Step 4 Locate the terminal block on the rear of the chassis on the power supply.
Step 5 Remove the terminal block plastic cover and then follow these steps:
a. Unscrew the negative cable Kepnut screw, washer, and ground lug, and remove the stud and lead wire.
b. Unscrew the positive cable Kepnut screw, washer, and ground lug, and remove the stud and lead wire.
c. Unscrew the earth ground Kepnut screw, washer, and ground lug and remove the stud and lead ground wire.
Step 6 Loosen the captive screws on the DC power supply.
Note Four power supplies must be installed in the chassis at all times, with a minimum of two power supplies (one per zone)
connected to the mains in order to power on the system and ensure sufficient cooling. The system fans are inside the
power supply units and must spin for cooling. Because all the system fans can be powered by one power supply, the
second power supply unit does not have to be powered on, but must be connected.
Caution If you remove a power supply from a system that has four power supplies that are connected and powered on, the
system can run only for a maximum of five minutes before shutting down. However, because the fans and power
elements are independent within the power supply, the replacement power supply does not have to be energized
within five minutes. The only requirement is that the power supply be installed in the chassis in order to energize
the fans and maintain proper system cooling.
Step 7 Grasping the power supply handles, pull the power supply from the chassis. When you remove the DC power supply,
you will see similar messages in the log report as shown in the section,
Remove and Then Replace an AC Power Supply,
page 31.
Step 8 Replace the DC power supply within five minutes or the system will shutdown.