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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
Several power supply options are available for the Cisco 2921, 2951, and 3900 series routers. See
Table 5-2
. All of the power supply and RPS options have a similar modular form factor, with no cabling,
for easy removal and replacement. If an RPS is attached, the power supply may be hot-swapped.
Note
The 3900 series routers do not use an external RPS, and instead use an optional secondary
internal power supply.
Note
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.
Replacing the Power Supply on the Cisco 2921 and Cisco 2951 Routers
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
Remove the fan tray and bezel assembly by pulling the fan tray and bezel assembly straight out. See
Figure 5-30
.
Step 3
Loosen the two captive screws on the power supply module. See
Figure 5-30
.
Step 4
Pull on the two captive power supply fastening screws to leverage the power supply from its connector,
and then slide the power supply module out of the chassis.
Step 5
Insert the replacement power supply module, and tighten the captive screws.
Step 6
Reinstall the fan tray and bezel assemblies.