4-2 CRU Replacement and Server UpgradesGeneral InformationThis chapter contains procedures for removing and installing customer-replaceable units (CRUs) and step-by-step instructions for upgrading yourserver system. When you disassemble any part of the server, note the orientationand placement of any cables or shielding that you remove.! WARNINGThe DC push button on/off switchs on the PCI modules donot turn off system AC power. Also, +5vdc is present on thesystem boards whenever the AC power cord is connectedbetween the system and an AC outlet. Before performingany procedures that require the server to be off, first poweroff the DC by pushing the power on/off button. Make sureyour system is powered off and the AC power cord isunplugged from the system. Failure to disconnect powerbefore opening your system can result in personal injury andequipment damage.! CAUTIONOperating your system with the access cover removed candamage system components. For proper cooling and airflow,always replace the access cover before powering on.
