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General descriptions
The desciptions in this chapter apply to any ThinkPad
model that has the PC-Doctor
®
DOS diagnostics program.
Some descriptions might not apply to your particular
computer.
Read this first
Before you go to the checkout guide, be sure to read this
section.
Important notes
v Only certified trained personnel should
service the computer.
v Before replacing any FRU, read the entire
page on removing and replacing FRUs.
v When you replace FRUs, use new
nylon-coated screws.
v Be extremely careful during such write
operations as copying, saving, or formatting.
Drives in the computer that you are servicing
sequence might have been altered. If you select
an incorrect drive, data or programs might be
overwritten.
v Replace an FRU only with another FRU of the
correct model. When you replace a FRU, make
sure that the model of the machine and the FRU
part number are correct by referring to the FRU
parts list.
v A FRU should not be replaced because of a
single, unreproducible failure. Single failures
can occur for a variety of reasons that have
nothing to do with a hardware defect, such as
cosmic radiation, electrostatic discharge, or
software errors. Consider replacing a FRU only
when a problem recurs. If you suspect that a
FRU is defective, clear the error log and run the
test again. If the error does not recur, do not
replace the FRU.
v Be careful not to replace a nondefective FRU.
What to do first
When you do return a FRU, you must include the following
information in the parts exchange form or parts return form
that you attach to it:
__ 1. Name and phone number of servicer
© Lenovo 2006. Portions © IBM Corp. 2006. 25