Cisco 4000-M Replacement Manual page 11

Remove the two external rear mounting screws and set them aside. (See Figure 7.)
Step 4
Slide the power supply forward slightly in the chassis. (See Figure 8.) This disengages
Step 5
the hook built into the chassis that helps secure the power supply.
Lift the power supply out of the chassis.
Step 6
Proceed with the section "Replacing AC and DC Power Supplies."
Figure 7 Cisco 4000 Series Chassis and Power Supply
Figure 8 Power Supply Removal
AUX CONSOLE
Power supply
Removing AC and DC Power Supplies
INPUT 100-240VAC 50/60HZ 3.0-1.5 AMPS
Mounting Power
screws supply
Front of chassis
Replacing the Cisco 4000 Series Power Supply 11