IBM Aptiva 2144 Hardware Maintenance Service

StartThis is the entry point for all check procedures. The check procedures usefailure symptoms, POST error codes, or beeps to help determine the failingfield replaceable unit (FRU). Follow the suggested check procedures or usethe Advanced Diagnostics diskettes to determine the problem FRU.The Advanced Diagnostics program comes on one diskette supplied with thisbook. Use only this diskette for all Service Level I IBM Aptiva PersonalComputers.The Advanced Diagnostics program is intended to test only IBM products.Non-IBM products, prototype cards, or modified options can give false errorsand invalid system responses.All voltages in the check procedures are positive unless otherwise shown.And, use frame ground for all voltage checks unless otherwise specified.Note: If the check procedures instruct you to replace a FRU and the errormessage remains the same, an option adapter card may be causingthe failure. Remove all option adapter cards, one at a time, until theerror changes or the problem is no longer apparent. Replace the lastoption adapter card removed.The hard disk drive contains preloaded software. Refer to “SoftwareInstallation Procedure” on page 4-42 to reinstall the original software. Besure to reload the software on the primary hard disk drive (drive C) whenreplacing it.Note: The drives in the system you are servicing might have beenre-arranged or the drive startup sequence changed. Be extremelycareful during write operations, such as copying, saving, orformatting. Data or programs can be overwritten if you select anincorrect drive.Ask the customer to back up any additional software from thehard disk drive before you take any action.How to Diagnose Combined FRUs: If an adapter or device consists ofmore than one FRU, any of the FRUs may cause an error code. Beforereplacing the device or adapter, remove the FRUs, one by one, to see if thesymptoms change.If you have been directed here from another check procedure and wereinstructed to replace the system board, and that does not correct theproblem, reinstall the original system board and go through “Start” again.2-2