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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 diskette 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 - All Tests" in PC-Doctor diagnostics program).
This book comes with a diagnostic program diskette. This diskette should be
used ONLY with Machine Type 2156 Computer. 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.
IMPORTANT: There is a voltage selector on the rear panel of the machine.
Use a flat-head screwdriver to turn the voltage selector to the
voltage setting for the area in which you will be using the
system.
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 Recovery CD contains pre-loaded software that may reinstall the original
software and recover the system. Ensure data and programs of the hard drive
have a backup copy.
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
the device or adapter, remove the FRUs one by one to see if the symptoms
change.
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