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Before you go to the checkout guide, be sure to read this
section.
Important Notes
Only certified, trained personnel should
service the computer.
Read FRU service procedures before replacing
any FRUs.
Be extremely careful during write operations
such as copying, saving, or formatting.
Drives in the computer that you are servicing
might have been rearranged or the drive startup
sequence might have been altered. If you select
an incorrect drive, data or programs can be
written over.
Use only the correct FRUs. When you replace
a FRU, make sure the model of the machine and
FRU part number are correct by referring to the
parts listing.
FRUs should not be replaced because of a
single, un-reproducible failure. Single failures
can occur from a variety of reasons that have
nothing to do with a hardware defect such as:
cosmic radiation, electrostatic discharge, or
software errors. FRU replacement should only
be considered when a recurring problem exists.
If this is suspected, clear the error log and run
the test again. Do not replace any FRUs if log
errors do not reappear.
Be careful not to replace a non-defective FRU.
How to Use Error Messages: Use the error
codes displayed on the screen to diagnose failures. If
more than one error code is displayed, begin the diagnosis
with the first error code. The cause of the first error code
can result in false error codes being displayed. If no error
code is displayed, see if the error symptom is listed in the
“Symptom-to-FRU Index” on page 565.
How to Diagnose Multiple FRUs: When the
adapter or device has more than one FRU, the error code
could be caused by either FRU. Before replacing multiple
FRUs, try removing or exchanging each FRU, one by one
in the designated sequence, to see if the symptoms
change.
What to Do First: The servicer must include the
following in the parts exchange form or part return form
that is attached to the returned FRU.
1. Name and phone number of servicer.
2. Date of service.
548 IBM Mobile Systems - ThinkPad HMM Volume 3