Check Procedures; Start - IBM Aptiva Hardware Maintenance Manual

Start

This is the entry point for all check procedures. The check procedures use
failure symptoms, Power-On Self Test (POST) error codes, or beeps to help
determine the defective field replaceable unit (FRU). Follow the suggested
check procedures or use the diagnostics diskette to determine the problem
FRU.
IMPORTANT: Replace FRUs ONLY when it is determined that the error is not
a result of software, loose contact, or dirty component surfaces. Any
FRU change should be verified by running a complete test
("Diagnostics - All Tests" in PC-Doctor diagnostics program).
This book comes with a diagnostic program diskette. This diskette should be
used ONLY with 2137/2138 Service Level A (SL-A) IBM Aptiva Personal
Computers. Do not use this diskette on other models.
POST error codes and error messages are displayed on the screen after the
IBM logo. A beep will precede each error code or message. Please refer to
"Index of Symptoms, Messages, Error Codes, or Beeps" on page 2-8 for
additional help.
All voltages in the check procedures are positive unless otherwise indicated.
Use frame ground for all voltage checks unless otherwise specified.
NOTE: If the check procedures instruct you to replace an FRU and the error
message persists, an option adapter card might be causing the
failure. Remove all option adapter cards, one at a time, until the error
changes or the problem is no longer apparent. Replace the last
option adapter card removed.
The hard disk drive contains pre-loaded software. Refer to "Software
Recovery Procedure" on page 4-35 to reinstall the original software. Be sure
to reload the software on the primary hard disk drive (Drive C) when replacing
it.
IMPORTANT: The drives in the system you are servicing may have been
rearranged, or the drive startup sequence has changed. Be extremely
careful during write operations, such as copying, saving, or
formatting. Data or programs can be overwritten if you select an
incorrect drive. Ask the customer to back up any additional
software from the hard disk drive before you reload the
software.
How to Diagnose Combined FRUs: If an adapter or device consists of more
than one FRU, any of the FRUs might cause an error code. Before replacing

Check Procedures 2-3