5-2
Cisco 7500 Series Installation and Configuration Guide
OL-5008-03 B0
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.
