Cisco 7000 Series Replacement Instructions Manual page 5

List of Parts and Tools
Cisco 7000 Air Filter and Chassis Blower Replacement Instructions 5
You can remove the bottom front chassis panel and replace the air filter while the
system is operating, but you must turn all power supplies OFF and disconnect power
cords before removing the top front chassis panel to access the chassis interior.
Dangerous current levels are present on the backplane when power is on.
Do not work alone when potentially hazardous conditions exist.
Carefully examine your work area for possible hazards such as moist floors,
ungrounded power extension cables, and missing safety grounds.
Before beginning any procedures requiring access to the chassis interior, locate the
emergency power-off switch for the room in which you are working.
Never assume that power has been disconnected from a circuit; always check.
In addition, use the following guidelines when working with any equipment that is
connected to telephone wiring or other network cabling.
Never install telephone wiring during a lightening storm.
Never install telephone jacks in wet locations unless the jack is specifically designed
for wet locations.
Never touch uninsulated telephone wires or terminals unless the telephone line has
been disconnected at the network interface.
Use caution when installing or modifying telephone lines.
You need the following tools to clean or replace the air filter, and to replace the blower:
To clean the air filter, you need a small hand vacuum.
To remove and wash the filter, or to replace it with a new filter, you might need a
small (3/16-inch) flat-blade screwdriver to push the edges of the filter back into the
frame of the top front panel.
To replace the system blower, you need the following tools:
— To remove the top front chassis panel, you need a medium (No. 2 Phillips or
3/16-inch flat-blade) screwdriver. Earlier chassis (the first several hundred
shipped) use slotted screws, and later chassis use Phillips screws to secure the top
front panel to the chassis. No tools are required to remove the bottom front
chassis panel.
— To loosen the captive screws on the blower, you need a long (9 inches or longer)
No. 2 Phillips screwdriver or a long (9 inches or longer) 3-mm center-hex Allen
wrench (the first few hundred systems shipped use Phillips screws; all subsequent
chassis use Allen-head screws). A 3-mm Allen-head T-handle driver is shipped
with all spare blowers.
Before beginning the replacement procedure, check the blower to determine which
tools you will need.