Cisco 2811 - Voice Security Bundle Router Hardware Manual page 135

Removing the Cover from Cisco 2821 and Cisco 2851 Routers
Follow these steps to remove the chassis cover. A number 2 Phillips screwdriver is required.
Rack-mounted routers must be removed from the rack and positioned on a flat surface before you start
removing the cover.
The following warning applies only if the router is provided with a DC-power input:
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Warning
Statement 1003
Make sure that the router is turned off and disconnected from its power source.
Step 1
Warning Before opening the unit, disconnect the telephone-network cables to avoid contact with
telephone-network voltages. Statement 1041
Disconnect all network interface cables from the rear panel of the router.
Step 2
Step 3 Place the router on a flat surface. Use a Phillips screwdriver to remove the three screws at the rear of the
top cover. Set the screws aside in a safe place.
Step 4 Lift the cover up to a 45-degree angle. (See
Step 5 Slide the cover to the side (toward the side with the fans) until the tabs are free from the slots. (See
Figure
OL-5792-04
7.)
Figure 7.)
Installing and Upgrading Internal Modules in Cisco 2800 Series Routers
Removing the Chassis Cover
7