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Read This First
Before you go to the check procedures, be sure to read
this section.
Important Notes
Only certified trained personnel should service
the computer.
Read the 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 could be overwritten.
Ensure that you replace FRUs with the appro-
priate model. When you replace the FRU, make
sure that 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. Single failure can
occur for a variety of reasons that have nothing
to do with a hardware defect, such as: cosmic
radiation, electrostatic discharge, or software
error. FRU replacement should be considered
only when a recurring problem exists. In this
case, clear the error log and run the test again.
Do not replace FRUs if log errors do not reap-
pear.
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 the other false error codes being
displayed.
How to Diagnose Mulitple 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 exhanging 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.
20 ThinkPad i Series 1400 HMM