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Installing and Upgrading Fans in Cisco 2811 Series Routers
78-17850-01
Removing the Chassis Cover
Step 1
Make sure that the router is turned off and disconnected from its power source.
Warning
Before opening the unit, disconnect the telephone-network cables to avoid contact with
telephone-network voltages.
Statement 1041
Step 2
If rack-mounting brackets are attached to the chassis, remove them, using a Phillips screwdriver.
Step 3
Remove the four screws at the back of the top cover, using a Phillips screwdriver.
Step 4
Perform the following steps to loosen the cover from the chassis:
a.
Insert the blade of the 1/4-inch screwdriver straight into the square hole on either side of the chassis
near the back, so that it fits against the chassis and does not go past the chassis and into the narrow
slot. See
Figure 1.
Caution
Make sure that the tip of the screwdriver does not slide into the narrow vertical slot that is visible inside
the square hole. The tip of the screwdriver should rest on the metal tab just inside the chassis cover and
to the right of the vertical slot.
Figure 1 Inserting the Screwdriver into the Side of the Chassis
b.
With the screwdriver positioned as required in Step a. above, rotate the screwdriver a quarter turn
toward the back of the chassis to loosen one side of the cover. See Figure 2.
Caution
The friction fit may be fairly tight; however, if the cover does not move with moderate effort, make sure
that the screwdriver is not inserted into the narrow vertical slot.
Figure 2 Rotating the Screwdriver to Loosen the Chassis Cover
c.
Repeat Step a. and Step b. for the opposite side of the chassis.
103860
Screwdriver must not
enter the vertical slot
103861