Cisco 2900 Series Installation Manual page 190

Replacing Power Supplies and Redundant Power Supplies
Note
Installing the Cisco 2921, Cisco 2951, or Cisco 3900 Series Optional DC Power Supply
Perform the following steps to install the Cisco 2921, Cisco 2951, or Cisco 3900 Series Optional DC
Power Supply:
Read the
Step 1
perform any module replacement.
Remove the fan tray and bezel assembly:
Step 2
•
•
Loosen the two captive screws on the AC power supply module. See
Step 3
Pull on the two captive AC power supply fastening screws to leverage the AC power supply from its
Step 4
connector, and then slide the power supply module out of the chassis.
Insert the DC power supply module, and tighten the captive screws.
Step 5
Reinstall the fan tray and bezel assemblies.
Step 6
Removing the Cisco 2921, Cisco 2951, or Cisco 3900 Series Optional DC Power Supply
Perform the following steps to remove the Cisco 2921, Cisco 2951, or Cisco 3900 Series Optional DC
Power Supply:
Read the
Step 1
perform any module replacement.
Remove the fan tray and bezel assembly:
Step 2
•
•
Loosen the two captive screws on the DC power supply module. See
Step 3
Pull on the two captive DC power supply fastening screws to leverage the AC power supply from its
Step 4
connector, and then slide the power supply module out of the chassis.
Reinstall the fan tray and bezel assemblies.
Step 5
Cisco 2900 Series and 3900 Series Hardware Installation Guide
5-40
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
For the Cisco 3900 series routers, pull straight out on the bezel to remove the bezel along with the
optional air filter from the fan tray assembly.
For the 2900 series routers, remove the bezel assembly, then loosen the four captive screws on each
corner of the fan tray assembly and pull out the fan tray assembly. See
"Safety Warnings" section on page 5-2
For the Cisco 3900 series routers, pull straight out on the bezel to remove the bezel along with the
optional air filter from the fan tray assembly.
For the 2900 series routers, remove the bezel assembly, then loosen the four captive screws on each
corner of the fan tray assembly and pull out the fan tray assembly. See
Chapter 5 Installing and Upgrading Internal Modules and FRUs
section and disconnect the power supply before you
Figure
section and disconnect the power supply before you
Figure
Figure 5-30.
5-30.
Figure 5-30.
5-30.