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Installing and Upgrading Fans in Cisco 3725 Series Routers
78-18564-01
Safety Recommendations
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when
electronic printed circuit cards are improperly handled and can result in complete or intermittent
failures. Always follow ESD prevention procedures when removing and replacing cards. Ensure that the
router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring
that it makes good skin contact. Connect the clip to an unpainted surface of the chassis frame to safely
channel unwanted ESD voltages to ground. To properly guard against ESD damage and shocks, the wrist
strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the
metal part of the chassis.
Caution For safety, periodically check the resistance value of the antistatic strap, which should be between 1 and
10 megohms (Mohms).