Do not touch the power supply when the power cord is connected. For systems with a
Warning
power switch, line voltages are present within the power supply even when the power switch is off
and the power cord is connected. For systems without a power switch, line voltages are present
within the power supply when the power cord is connected. (To see translated versions of this
warning, refer to the Regulatory Compliance and Safety Information document that accompanied the
router.)
The following warning applies to routers with DC power supplies:
Before performing any of the following procedures, ensure that power is removed from
Warning
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (To see translated versions of this warning, refer to the
Regulatory Compliance and Safety Information document that accompanied the router.)
Follow this procedure to remove the chassis cover:
Turn OFF power to the router.
Step 1
Before opening the chassis, disconnect the telephone-network cables to avoid contact
Warning
with telephone-network voltages. (To see translated versions of this warning, refer to the Regulatory
Compliance and Safety Information document that accompanied the router.)
Warning
Do not work on the system or connect or disconnect cables during periods of lightning
activity. (To see translated versions of this warning, refer to the Regulatory Compliance and Safety
Information document that accompanied the router.)
Remove all network interface cables from the rear panel.
Step 2
If the router is rack- or wall-mounted, remove it from the rack or wall.
Step 3
Place the router so the front panel is closest to you. Remove the three screws located on
Step 4
top of the cover near the front edge. (Figure 2 shows these screws for the Cisco 3620
cover, and Figure 3 shows the screws for the Cisco 3640 cover.) Set the screws aside in a
safe place.
Lift the front edge of the cover about 1 inch (2.5 cm) above the chassis, as shown in
Step 5
Figure 1.
Cisco 3600 Series Memory Upgrade Configuration Note
Removing the Cover
5
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