General
checkout
19
This
chapter
presents
the
following
information:
•
•
Before
you
go
to
the
checkout,
make
sure
to
read
the
following
important
notes:
General checkout
Important notes:
•
Only certified trained personnel can service the computer.
•
Before replacing any FRU, read the entire page on removing and
replacing FRUs.
•
When you replace FRUs, use new nylon-coated screws.
•
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.
•
Replace an FRU only with another FRU of the correct model.
When
you
replace
an
FRU,
make
sure
that
the
machine
model
and
the
FRU
part
number
are
correct
by
referring
to
the
FRU
parts
list.
•
An FRU should not be replaced just 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
an
FRU
only
when
a
problem
recurs.
If
you
suspect
that
an
FRU
is
defective,
clear
the
error
logs
and
run
the
test
again.
If
the
error
does
not
recur,
do
not
replace
the
FRU.
•
Be careful not to replace a nondefective FRU.
