General
checkout
This
chapter
presents
following
information:
v
“What
to
do
first”
on
page
24
v
“Checkout
guide”
on
page
25
–
“Diagnostics
using
PC-Doctor
for
DOS”
on
page
26
–
“PC-Doctor
for
Windows”
on
page
28
–
“PC-Doctor
for
Rescue
and
Recovery”
on
page
28
v
“Power
system
checkout”
on
page
29
The
descriptions
in
this
chapter
apply
to
any
ThinkPad
model
that
supports
the
PC-Doctor
®
for
DOS
diagnostics
program.
Some
descriptions
might
not
apply
to
your
particular
computer.
Before
you
go
to
the
checkout
guide,
be
sure
to
read
the
following
important
notes.
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
a
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.
©
Copyright
Lenovo
2008
23
Summary of Contents for XT904UT
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