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Chapter
9.
Replacing
FRUs
(Types
8143,
8144,
8146,
8422,
8423,
and
8427)
FRU
replacements
are
to
be
done
by
trained
service
technicians
only.
This
chapter
does
not
contain
a
remove
and
replace
procedure
for
all
FRUs.
Only
the
major
FRUs
are
documented
in
this
manual.
Important
Before
you
install
or
remove
any
FRU,
read
Chapter
2,
“Safety
information,”
on
page
5.
These
precautions
and
guidelines
will
help
you
work
safely.
Locating
controls
and
connectors
on
the
front
of
the
computer
This
section
shows
the
various
external
connectors
on
the
computer
to
which
you
can
attach
external
devices.
1
3
9
4
1
IEEE
1394
connector
4
Microphone
connector
2
USB
connector
5
Headphone
connector
3
USB
connector
©
Lenovo
2005,
2008.
Portions
©
IBM
Corp.
2005.
115
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