Cisco 3900 series User Manual

5-30
Cisco 2900 Series and 3900 Series Hardware Installation Guide
OL-18712-03
Chapter 5 Installing and Upgrading Internal Modules and FRUs
Replacing Power Supplies and Redundant Power Supplies
Replacing the Cisco 2901 Router Power Supply
Warning Blank faceplates and cover panels serve three important functions: they prevent exposure to
hazardous voltages and currents inside the chassis; they contain electromagnetic interference (EMI)
that might disrupt other equipment; and they direct the flow of cooling air through the chassis. Do not
operate the system unless all cards, faceplates, front covers, and rear covers are in place.
Statement
1029
To replace the power supply in a Cisco 2901 router, perform the following steps. See Figure 5-3 for the
locations of connectors and other components within the Cisco 2901 router.
Step 1 Read the “Safety Warnings” section on page 5-2 section and disconnect the power supply before you
perform any module replacement.
Step 2 Disconnect the router from the external AC power supply.
Step 3 Remove the cover from the chassis. See the “Removing and Replacing the Chassis Cover” section on
page 5-4.
Step 4 Disconnect the power supply cable from the main power supply connector. See Figure 5-24.

Cisco 3900 series Specifications

General

Brand	Cisco
Model	3900 series
Category	Network Router
Language	English