IBM Aptiva 2174 Hardware Maintenance Service

Check Procedures 49TroubleshootingFailing Parts or Assemblies: The check procedures generally help you tracea problem to one part or assembly. The last step of the specific checkprocedure you are using indicates that a part or assembly is failing. You shouldinspect the part or assembly before you decide to replace it. It might be loose,dirty, or in need of a small repair. The check procedures might lead you to two,or even three, possible failing parts or assemblies. The parts that might befailing are listed in order of the most probable failure. Also, the FRU parts aredefined as replaced units and are not repaired in the field.Measuring Voltages: Some check procedure steps instruct you to measurevoltages on cable plugs and electronic board connectors. If you are asked tomeasure voltage at several places on a plug or connector, a chart next to ornear the instruction indicates the number of the plug or connector, the pinnumbers you should measure, the signal name, and the correct voltage for thecondition you are measuring. Measure the voltage only at the pins listed in thechart. Remember to set the meter on the correct scale and to put the meterleads in the correct position for the voltage you are asked to measure.NOTE: Use frame ground as the ground reference. Attach the black (ground)lead of meter to frame ground, except where specified otherwise.Factory-Installed Storage DevicesUse this check procedure to test any factory-installed drives, including Zipdrives.ATTENTION: The customer may have customized settings in the Setup Utility(other than default settings) on the computer you are servicing. Runningthe Setup Utility might alter those settings. Take note of the currentsettings and verify that the customer settings are in place when serviceis complete.NOTE: If you cannot access the hard disk drive or load a diskette from Drive Aor load a CD from the CD-ROM drive, make sure that the BIOS SetupUtility has the startup sequence set with diskette, CD ROM, and harddisk drives.001 - START• Insert the diagnostics diskette into the diskette drive.• Power-off then power-on the system unit.002 - DO ANY POST MESSAGES, BEEPS, OR SYMPTOMS OCCUR?