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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Chapter 6 Maintaining the Router
Removing and Replacing an AC PEM
Use the following procedure to remove and replace an AC power supply.
Caution You cannot mix power supply types within the chassis. If you are replacing a 1400
W power supply from an older system with a new 1900 W power supply, you must
replace both power supplies, the AC PDU, and the blower module if you are
required to meet NEBS extended temperature range requirements (see the
“Power
Supply and PDU Compatibility” section on page 6-14 for additional information).
You must shut down the router to perform the upgrade. Notify the system
administrator and other appropriate personnel that all routing traffic stops while
upgrades take place.
Step 1 Set the power switch to the Off (0) position.
Step 2 Unplug the power supply cord from its AC outlet.
Step 3 Power off the circuit breaker assigned to that AC outlet.