Cisco Systems 7500 Series manual Removing and Replacing the Cisco 7505 Power Supply

Chapter 5 Maintaining Your Cisco 7505 Router

Maintenance Procedures for the Cisco 7505

Removing and Replacing the Cisco 7505 Power Supply

The power supply rests on the floor of the chassis under the card cage and backplane. To remove the power supply, you must remove the chassis access cover at the noninterface processor end of the router, remove the power harness cover, and disconnect the harness from the backplane receptacle. Always pull the harness out by the connector, not by the wires. Before removing the power harness cover, ensure that the system power is turned off; otherwise, the backplane voltages become a hazard.

On the AC receptacle, located on the interface processor end of the AC-input power supply, a cable-retention clip snaps up and around the modular power cable connector to prevent the cable from accidentally being pulled out or from falling out. (See Figure 5-8.) When you insert the power supply, this clip can get snagged on the chassis floor. Before inserting the supply, remove the clip or tape it up out of the way.

On the DC-input power supply, a nylon cable tie provides the cable strain relief. Replace this strain relief with a new nylon cable tie after you install the new DC-input power supply. The interface processor end of the DC-input power supply has a terminal block rather than the AC receptacle. (See Figure 5-8.)

Warning To prevent damage to the harness wires, always pull the connector, not the harness wires, to disconnect the power harness.

Figure 5-8 Cisco 7505 AC-Input Power Supply—Interface Processor End

On/off switch

AC receptacle

Cable retention clip

DC OK LED

H1998

The following procedure assumes you already removed the chassis cover panel, the fan tray, the power harness cover, and the power harness. If not, see the appropriate sections in this chapter. You need a number 2 Phillips screwdriver and a pair of wire cutters.

Use the following procedure to remove the power supply:

Step 1 Turn off the system power switch.

Warning Before working on the chassis or near power supplies, disconnect the power cable on AC units or disconnect the power at the circuit breaker on DC units.

Step 2 For the AC-input power supply: Move the cable retention clip away for the power cable and disconnect the power cable from the AC receptacle.

Step 3 For the DC-input power supply: Use a wire cutter to cut the nylon cable tie that provides strain relief for the DC power cable. (You must replace this nylon cable tie with a new one after the new power supply is installed.) Remove the DC-input cable from the terminal block.

Step 4 Attach an ESD-preventive strap (your own or the one supplied with the spare) between you and any unpainted chassis surface.

	Cisco 7500 Series Installation and Configuration Guide
OL-5008-03 B0		5-13