Cisco XM Universal Gateways Cisco AS5400XM - Manual (Page 69)

B-3
Cisco AS5400XM Universal Gateway Chassis Installation Guide
OL-6418-02
Appendix B Replacing the Power Supply
Removing the Chassis Cover
Warning Before connecting or disconnecting ground or power wires to the chassis, ensure that power is
removed from 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. Statement 140
Figure B-1 DC Power Supply Connections
a. Loosen the six locking screws for the negative, return, and ground connectors on the DC power
supply terminal blocks.
b. Remove the –48 VDC wires from the terminal block negative connectors (–).
c. Remove the 48 VDC wires from the terminal block positive connectors (+).
d. Remove the safety ground (green wires) from the terminal block ground connectors.
Caution Do not connect the 48 VDC wire to the chassis. A single-point ground is recommended at the power
distribution rack.
Step 2 Remove all interface cables from the rear of the chassis.
Step 3 Place the chassis so that the front panel is facing you.
Step 4 Remove the four screws on the chassis cover. (See Figure B-2 .)
On/off
switch
LEDs
31628
Terminal
block
Mounting screw Mounting screw
Mounting
screw
IN OK
DC OK
OTF
IN OK
DC OK
OTF
LEDs
Terminal
block
Strain-relief
clamps
Strain-relief
clamps