General descriptions
This chapter includes descriptions for any ThinkPad model
that has the PC-Doctor DOS diagnostics program. Some
descriptions m ight not apply to your particular computer.
Read this first
Before you go to the checkout guide, be sure to read this
section.
Im p o rta nt notes
• O n ly c e rtifie d train e d p e rs o n n e l s h o u ld
se rv ice th e com puter.
• Read th e e n tire FRU re m oval and re placem ent
page befo re rep la cin g a n y FRU.
• Use new n y lo n-coate d s cre w s w hen you
replace FRUs.
• Be e x tre m e ly c a re fu l d u rin g s u c h w rite
o p e ra tio n s as c o p y in g , saving , o r fo rm a ttin g.
Drives in the computer that you are servicing
sequence m ight have been altered. If you select
an incorrect drive, data or programs might be
overwritten.
• R eplace FRUs o n ly fo r th e c o rre c t m odel.
When you replace a FRU, make sure the model
of the machine and the FRU part number are
correct by referring to the FRU parts list.
• A FRU sh o u ld n o t be rep laced because o f a
sing le , u n re p ro d u c ib le fa ilu re . 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.
• Be c a re fu l n o t to replace a n o n d e fe ctive 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
2. Date of service
3. Date on which the machine failed
© Copyright IBM Corp. 2004 25
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