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Read This First
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
overwritten.
Replace FRUs only for the correct model.
When you replace the FRU, make sure the
model of the machine and FRU part number are
correct by referring to the part list.
FRUs should not be replaced because of a
single, unreproducible failure. A single failure
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 be
considered only for a recurring problem. If you
suspect an unreproducible failure, clear the error
log and run the test again. Do not replace any
FRUs if the error log did not reappear.
Be careful not to replace a nondefective 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. If no error code is displayed, see
if the error symptom is listed in the “Symptom-to-FRU
Index” on page 640.
How to Diagnose Multiple FRUs: If 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 parts return form
that is attached to the returned FRU.
1. Name and phone number of servicer.
2. Date of service.
3. Date when part failed.
4. Date of purchase.
622 IBM Mobile Systems HMM