IBM Aptiva 2144 Hardware Maintenance Service

Removals and Replacements—Machine Type 2144CAUTION:Before removing any FRU, power off the system unit, unplug all powercords from electrical outlets, disconnect any interconnecting cables,and disconnect any telephone cords.The power supply might contain +5 V dc auxiliary power when thesystem is powered off. Be sure to unplug the power cord beforeattempting any replacements.Warning: The system board, processors, adapter cards, SIMMs, videomemory modules, and upgrade processors can be damaged by electrostaticdischarge. Use an electrostatic discharge (ESD) strap to establish personalgrounding. If you don’t have an ESD strap, establish personal grounding bytouching a ground point with one hand before touching the static-sensitiveFRUs.The arrows in the removals and replacements procedures show the directionof movement to remove a field-replaceable unit (FRU), to turn a screw, or topress a tab to release the FRU.Begin all removals by removing the cover (and rear cover, if applicable).When other FRUs must be removed prior to removing the failing FRU, theyare listed at the top of the page. Go to the removal procedure for each FRUlisted, remove the FRU, and then continue with the removal of the failingFRU.To replace a FRU, reverse the removal procedure and follow any notes thatpertain to replacement. See “Parts/Test Point Locations” on page 5-1 forinternal cable connection and arrangement information.Before disconnecting any cables, note their locations. Reinstall any newFRUs with cables in the same locations.4-2