4-4 CRU Replacement and Server Upgrades! CAUTIONElectrostatic discharge (ESD) and ESD protection. ESDcan damage disk drives, boards, and other parts. Thissystem can withstand normal levels of environmental ESDwhile you are hot-swapping SCSI hard drives or hot-swapping a failed fan module or power supply. However, werecommend that you do all procedures in this chapter only atan ESD workstation. If one is not available, provide someESD protection by wearing an antistatic wrist strap attachedto chassis ground (any unpainted metal surface) on yoursystem when handling parts.ESD and handling boards. Always handle boards carefully.They can be extremely sensitive to ESD. Hold boards onlyby their edges. After removing a board from its protectivewrapper or from the system, place it component-side up on agrounded, static-free surface. Use a conductive foam pad ifavailable but not the board wrapper. Do not slide board overany surface.Chassis covers, proper cooling and airflow. For propercooling and airflow, always install the chassis top coverbefore turning on the system. Operating it without the coverin place can damage system parts.Contact your sales representative or dealer for a list of approved optionalperipheral devices.
