WARNING: Indicates a hazard that could cause injury orproperty damage.electrostatic dischargeElectrostatic discharge (ESD) is a natural by-product of humanactivity. ESD is transmitted by materials that retain andaccumulate electrical charges.Caution: ESD can damage electronic components whenthey are improperly handled and can result in completeor intermittent failures. Always follow ESD-preventionprocedures when removing and replacing components.To prevent ESD damage, follow these guidelines:n Always use an ESD wrist or ankle strap and ensure that itmakes skin contact.n Connect the equipment end of the strap to an unpaintedmetal chassis surface.n If no wrist strap is available, ground yourself by touchingthe metal chassis.n When installing or removing a component, use anyavailable ejector levers or captive installation screws toproperly seat the bus connectors in the backplane or cardslot. These devices prevent accidental removal, provideproper grounding for the system, and help to ensure thatbus connectors are properly seated.n Handle adapter cards by available handles or edges only.Avoid touching the printed circuit boards or connectors.n Avoid contact between printed circuit boards and clothing.The wrist strap only protects components from ESDvoltages on the body; ESD voltages on clothing can stillcause damage.n Place a removed component board-side-up on an antistaticsurface or in an approved antistatic container.!