Appendix A. Replacing customer replaceable units (CRU)Some computer models are designed to be serviced with customer replaceableunits (CRU). The CRUs for your computer vary by machine type. Theseprocedures are provided to guide you when replacing the following CRUs:v power supplyv microprocessorv system boardv batteryv speakerv fanv power button and LED assemblyFor memory DIMMs, PCI adapters, diskette drive, CD-ROM drive, and hard diskdrive procedures, see Chapter 2, “Installing options,” on page 7.If you have Internet access, the most up-to-date User Guide and HardwareMaintenance manual (HMM) for your computer are available from the World WideWeb. To access this information, go to:http://www.ibm.com/pc/supportTo replace some CRUs in your computer, you will need a flat-blade screwdriver.See “Handling static-sensitive devices” on page 7 before replacing CRUs.Although there are no moving parts in your computer after the power cord hasbeen disconnected, the following warning is required for proper UL certification.WarningHazardous moving partsKeep fingers and other body parts awayCaution:Turn off the computer and wait 3 to 5 minutes to let the computer cool beforeopening the cover.AttentionBefore disconnecting any cables, take note where the cables are connected.This is important when installing new CRUs.© Copyright IBM Corp. 2004 29
