Router Installation Guide

5-17
Cisco XR 12404 Router Installation Guide
OL-13830-02
Chapter 5 Maintaining the Router
Removing and Replacing a DC Power Entry Module
Step 1 If the Input OK and Output OK LEDs are off, or if the Output Fail LED is on,
make sure that the:
• PEM is firmly seated in the bay and the captive screws are tightened securely.
• AC power source circuit breaker is switched on.
• Power cord is firmly plugged into the AC power source receptacle.
• Power cord is firmly plugged into the PEM and the bail latch is secure over
the plug.
• Power switch is set to the on (1) position.
Step 2 If the problem still exists after checking the items in Step 1, replace the PEM.
If replacing the PEM does not correct the problem, contact a Cisco service
representative for assistance.
Removing and Replacing a DC Power Entry Module
Although a DC PEM supports OIR, in order to maintain operational redundancy,
proper cooling, and meet EMI compliance standards, you must have both working
power supplies installed. When you remove a failed power supply with the router
in operation, perform the replacement as quickly as possible. Make sure you have
the tools and the replacement power supply ready before beginning the removal
and installation procedure.
Refer to Figure 5-10 and use the following procedure to remove and replace a
DC PEM.
Step 1 Power off the faulty PEM.
Step 2 Power off the circuit breaker assigned to the DC power source.
Step 3 Loosen the three captive screws that secure the PEM to the chassis.
todd.book Page 17 Tuesday, July 24, 2007 3:54 PM