IBM 2193 Maintenance Service Manual page 65

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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 2193, 2194,
2196, 2197, 6344 and 6345. 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 69 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. The problem
may be in the last card that you removed or
something associated with it.
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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