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Appendix
A.
Replacing
customer
replaceable
units
(CRU)
Some
computer
models
are
designed
to
be
serviced
with
customer
replaceable
units
(CRU).
The
CRUs
for
your
computer
vary
by
machine
type.
These
procedures
are
provided
to
guide
you
when
replacing
the
following
CRUs:
v
power
supply
v
microprocessor
v
system
board
v
battery
v
speaker
v
fan
v
power
button
and
LED
assembly
For
memory
DIMMs,
PCI
adapters,
diskette
drive,
CD-ROM
drive,
and
hard
disk
drive
procedures,
see
Chapter
2,
“Installing
options,”
on
page
7.
If
you
have
Internet
access,
the
most
up-to-date
User
Guide
and
Hardware
Maintenance
manual
(HMM)
for
your
computer
are
available
from
the
World
Wide
Web.
To
access
this
information,
go
to:
http://www.ibm.com/pc/support
To
replace
some
CRUs
in
your
computer,
you
will
need
a
flat-blade
screwdriver.
See
“Handling
static-sensitive
devices”
on
page
7
before
replacing
CRUs.
Although
there
are
no
moving
parts
in
your
computer
after
the
power
cord
has
been
disconnected,
the
following
warning
is
required
for
proper
UL
certification.
Warning
Hazardous
moving
parts
Keep
fingers
and
other
body
parts
away
Caution:
Turn
off
the
computer
and
wait
3
to
5
minutes
to
let
the
computer
cool
before
opening
the
cover.
Attention
Before
disconnecting
any
cables,
take
note
where
the
cables
are
connected.
This
is
important
when
installing
new
CRUs.
©
Copyright
IBM
Corp.
2003
31