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Cisco uBR7200 Series Universal Broadband Router AC Power Supply Replacement Instructions
78-4848-06
Removing and Replacing an AC-Input Power Supply
• If access to the rear of the router is partially blocked by a power strip or some other permanent rack
fixture, detach the router from the rack and carefully slide it forward until there is enough clearance
to remove the power supply, the fan tray, the network processing engine, and the subchassis from
the router. Detailed steps for detaching the router from the rack are contained in the following
section, “Removing and Replacing an AC-Input Power Supply.”
Caution Make sure that at least one other person is available to support the front of the router as you slide it out
from the rack and, if necessary, to continue to support it while you remove and insert the power supply,
network processing engine, or subchassis.
Removing and Replacing an AC-Input Power Supply
The following sections explain how to remove and replace an AC-input power supply in a
Cisco uBR7200 series router for a single power supply configuration and a dual power supply
configuration.
Caution When the input power to a Cisco uBR7200 series power supply is disconnected or lost, the power supply
will enter a reset cycle for 90 seconds. Wait at least 90 seconds or move the power switch from one
position to the other to restart the power supply. For example, if the power supply was ON when the
power was disconnected or lost, move the power switch to the OFF position then back to the ON position.
If you do not wait the full 90 seconds or move the power switch from one position to the other, the power
supply will not restart. This caution note does not apply to the Cisco uBR7225VXR power supply.
Single Power Supply Configuration
Removing and replacing the AC-input power supply in a single power supply configuration involves the
following tasks:
• Powering Down the Router, page 8
• Disconnecting AC-Input Power, page 9
• Removing the AC-Input Power Supply, page 10
• Installing the AC-Input Power Supply, page 11
• Reconnecting AC-Input Power, page 12
• Powering Up the Router, page 13
These tasks are described in detail in the following subsections.
Powering Down the Router
Note Before powering down the router, use the copy running-config startup-config command to save the
router’s running configuration to nonvolatile memory.
Step 1 Facing the rear of the router, place the power switch (on the power supply) in the OFF (O) position.
Repeat this action if a second power supply is installed in the router.