Cisco Systems 7500 Series manual Tools Required for Maintenance Procedures

Chapter 5 Maintaining Your Cisco 7505 Router

Tools Required for Maintenance Procedures

Tools Required for Maintenance Procedures

You need the following tools to replace any one of the Cisco 7505 internal spares:

•3/16-inch flat-blade or number 1 Phillips screwdriver to loosen the captive screws on the chassis cover panel and the DC-input terminal connections on the DC-input power supply

•Number 1 Phillips screwdriver for the power harness cover

•Number 2 Phillips screwdriver for the M4 Phillips screws on the power supply and the fan tray

Overview of Maintenance Procedures for the Cisco 7505

To replace internal spares, you must remove the chassis cover panel and expose the chassis interior. To replace the power supply components, you must also remove the power harness cover, which exposes the backplane power connection.

Warning If the power is not shut down before removing the chassis cover panel, the high current on the fan tray and fan control board can be a hazard. When the power harness cover is removed, the high current present in the wiring and on the backplane can also be a hazard. Removing the cover panel when the system is operating compromises the EMI integrity of the system. Therefore, always turn off the system power before removing the cover panel; remove the cover panel only when it is necessary to replace internal components.

The Cisco 7505 fan tray comprises six individual fans (the fan array) and a fan control printed circuit board mounted on a metal tray (see Figure 5-2); the entire assembly is called the fan tray. The fan tray slides into the right side of the chassis (when you view the chassis from the noninterface processor end). The fans draw cooling air through the inlet vents on the left side of the chassis (when you view the chassis from the noninterface processor end) and force the air out through the exhaust vents on the right side of the chassis.

The fan control board distributes power to the fans, controls the fan speed, and monitors and reports fan failures to the system through the backplane.

The power harness cover (see Figure 5-4) shields the wiring harness that delivers DC power from the power supply to the backplane. The power harness, which is part of all power supplies, carries DC voltages from the power supply to the backplane. The backplane distributes the operating voltages to all of the internal chassis components.

For the AC-input power supply, an external modular power cable delivers AC source power to the external AC receptacle on the interface processor end of the power supply.

For the DC-input power supply, a three-lead, 10-AWG power cable that you provide delivers DC source power to the terminal block on the power supply.

The power supply rests on the floor of the chassis, under the card cage and backplane. The noninterface processor end of the power supply has handles for pulling it out of the chassis. Before inserting a power supply, remove the cable retention clip (or secure it with tape); otherwise, it will catch on the chassis floor and prevent the chassis from sliding into the power supply bay.

The backplane cover shields the noninterface processor side of the backplane as well as the arbiter and chassis interface.

Cisco 7500 Series Installation and Configuration Guide

5-2 OL-5008-03 B0