Cisco 2900 Series Installation Manual page 186

Replacing Power Supplies and Redundant Power Supplies
Several power supply options are available for the Cisco 2921, 2951, and 3900 series routers. See
Table
for easy removal and replacement. If an RPS is attached, the power supply may be hot-swapped.
Note
Note
Replacing the Power Supply on the Cisco 2921 and Cisco 2951 Routers
Read the
Step 1
perform any module replacement.
Remove the fan tray and bezel assembly by pulling the fan tray and bezel assembly straight out. See
Step 2
Figure
Loosen the two captive screws on the power supply module. See
Step 3
Pull on the two captive power supply fastening screws to leverage the power supply from its connector,
Step 4
and then slide the power supply module out of the chassis.
Insert the replacement power supply module, and tighten the captive screws.
Step 5
Reinstall the fan tray and bezel assemblies.
Step 6
Cisco 2900 Series and 3900 Series Hardware Installation Guide
5-36
1-9. All of the power supply and RPS options have a similar modular form factor, with no cabling,
The 3900 series routers do not use an external RPS, and instead use an optional secondary
internal power supply.
Read this entire procedure and have all of your tools and the replacement power supply ready
before performing a hot-swap. The hot-swap procedure requires removal of the cooling fans.
You have only a few minutes to replace the fans before the router powers off, because the router
has reached the upper temperature limits.
"Safety Warnings" section on page 5-2
5-30.
Chapter 5 Installing and Upgrading Internal Modules and FRUs
section and disconnect the power supply before you
Figure 5-30.