Cisco 4000-M Replacement Manual page 6

Accessing the Power Supply
Accessing the Power Supply
To access the power supply of a Cisco 4000 series router, you must first remove the component tray.
Procedures for removing the component tray follow.
Some Cisco 4000 series routers have a safety latch tab on the chassis that affects removing the
component tray. (See Figure 3 and Figure 4.)
If your chassis has a safety latch tab, refer to the next section, "Removing the Component Tray from
a Chassis with a Safety Latch."
If your chassis does not have a safety latch tab, go to the section "Removing the Component Tray
from a Chassis without a Safety Latch."
Note
system console port, auxiliary port, and module ports appear to the left of the power cable and
switch. (See Figure 2.)
Removing the Component Tray from a Chassis with a Safety Latch
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.
Take the following steps to remove the component tray from a chassis with a safety latch:
Step 1
Step 2
Step 3
Step 4
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.
Step 5
6 Replacing the Cisco 4000 Series Power Supply
The power cable and power switch are on the lower right of the rear panel of the router. The
Do not touch the power supply when the power cord is connected. For systems with a
Turn OFF the system power.
Attach your ESD-preventive wrist strap.
Remove all network cables. Proceed with Step 4 if you have an AC power supply. Proceed
with Step 5 if you have a DC power supply.
If you have an AC-powered router, remove the power cord.
Before performing any of the following procedures, ensure that power is removed from
If you have a DC-powered router, take the following steps to remove the power cables:
Use a screwdriver to loosen the captive installation screws on the terminal block
(a)
cover.
(b) Lift and remove the terminal block cover.
(c) Use a screwdriver to remove the three power leads from the terminal block in the
following order: negative, positive, then ground.