Lenovo ThinkPad 500 Hardware Maintenance Manual - Page 31

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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, 2009 23

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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,
2009
23