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Installing and Upgrading Fans in Cisco 3725 Series Routers
78-18564-01
Safety Recommendations
Before you replace the fan, disconnect the power and remove the cover, as described in the “Removing
the Chassis Cover” section on page 10. After you replace the fan, install the chassis cover as described
in the “Replacing the Cisco 3725 System Fan” section on page 11.
Safety Recommendations
Follow these guidelines to ensure general safety:
• Keep the chassis area clear and dust-free during and after installation.
• Place the removed chassis cover in a safe place.
• Keep tools away from walk areas where you or others could fall over them.
• Do not wear loose clothing that may get caught in the chassis. Fasten your tie or scarf and roll up
your sleeves.
• Wear safety glasses when working under conditions that may be hazardous to your eyes.
• Do not perform any action that creates a potential hazard to people or makes the equipment unsafe.
Safety with Electricity
Warning
Before working on equipment that is connected to power lines, remove jewelry (including rings,
necklaces, and watches). Metal objects will heat up when connected to power and ground and can
cause serious burns or weld the metal object to the terminals.
Follow these guidelines when working on equipment powered by electricity:
• Locate the room’s emergency power-off switch. Then, if an electrical accident occurs, you can
quickly shut the power off.
• Before working on the system, turn off the power and unplug the power cord.
• Disconnect all power.
• Do not work alone if potentially hazardous conditions exist.
• Look carefully for possible hazards in your work area, such as moist floors, ungrounded power
extension cables, and missing safety grounds.
• Never assume that power is disconnected from a circuit. Always check.
• If an electrical accident occurs, proceed as follows:
–
Use caution, and do not become a victim yourself.
–
Turn off power to the system.
–
If possible, send another person to get medical aid. Otherwise, determine the condition of the
victim and then call for help.
–
Determine if the person needs rescue breathing or external cardiac compressions; then take
appropriate action.