IBM 6645, 6644, 6646 manual Start, Important The drives in the system you are Check Procedures

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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 CD to determine the problem FRU.

IMPORTANT: Replace FRUs ONLY when it is determined that the error is not a result of software, loose contacts, or dirty component surfaces. Any FRU change should be verified by running a complete test (“Diagnostics - Run Normal Test” in PC-Doctor diagnostics program).

NOTE: The disagnostic program diskette can be created from the Recovery CD if the user has a USB diskette drive attached.

The diagnostic program diskette diskette should be used ONLY with 6644/6645/6646 Service Level A (SL-A)IBM 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. Meanwhile, error beeps could be issued to help diagnose system problem. Please refer to “Index of Symptoms, Messages, Error Codes, or Beeps” on page 36 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 a 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 102, 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

Check Procedures 31