IBM 2388 Hardware Maintenance Manual - Page 29

General, descriptions

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General descriptions The desciptions in this chapter apply to any ThinkPad model that has the PC-Doctor® for 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 Read the entire FRU removal and replacement page before replacing any FRU. v Use new nylon-coated screws when you replace FRUs. v Be extremely careful during write operations such as copying, saving, or formatting. The drive startup sequence in the computer you are servicing might have been changed. If you select an incorrect drive, data or programs might be overwritten. v Replace FRUs only for the correct model. 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. 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 __ 2. Date of service © Lenovo 2005. Portions © IBM Corp. 2005. 25

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General
descriptions
The
desciptions
in
this
chapter
apply
to
any
ThinkPad
model
that
has
the
PC-Doctor
®
for
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
Read
the
entire
FRU
removal
and
replacement
page
before
replacing
any
FRU
.
v
Use
new
nylon-coated
screws
when
you
replace
FRUs
.
v
Be
extremely
careful
during
write
operations
such
as
copying,
saving,
or
formatting.
The
drive
startup
sequence
in
the
computer
you
are
servicing
might
have
been
changed.
If
you
select
an
incorrect
drive,
data
or
programs
might
be
overwritten.
v
Replace
FRUs
only
for
the
correct
model.
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.
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
__
2.
Date
of
service
©
Lenovo
2005.
Portions
©
IBM
Corp.
2005.
25