Lenovo ThinkPad 300 Service Guide - Page 65

Appendix, Customer, Replaceable, Units

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Appendix B. Customer Replaceable Units (CRUs) Customer Replaceable Units (CRUs) are computer parts that can be upgraded or replaced by the customer. There are two types of CRUs: internal and external. External CRUs are easy to install, whereas internal CRUs require some technical skills and in some cases might require tools such as a screwdriver. However, both internal and external CRUs are safe for removal by the customer. Customers are responsible for replacing all external CRUs. Internal CRUs can be removed and installed by customers or by a Lenovo service technician during the warranty period. Your computer contains the following types of external CRUs: v External CRUs (pluggable): These CRUs unplug from the computer. Examples of these types of CRUs include the AC adapter and power cord. v External CRUs with latches: These CRUs include a latch to help you remove and replace the part. Examples of these types of CRUs include the notebook main battery and devices such as an optical drive, a hard-disk drive, and an extended battery. Your computer contains the following types of internal CRUs: v Internal CRUs (located behind an access panel): These CRUs are isolated parts within the computer that are concealed by an access panel that is typically secured by either one or two screws. Once the access panel is removed, only the specific CRU is visible. Examples of these types of CRUs include memory modules and storage devices. v Internal CRUs (located within the product): These CRUs are accessible only by opening the computer's outer case. Examples of these CRUs include PCI Express Mini Cards and the integrated keyboard. Online Access Help provides instructions for replacing internal and external CRUs. To start the Access Help program, click Start, move the pointer to All Programs ; then to ThinkVantage. Click Access Help. Additionally, the Service and Troubleshooting Guide (this guide) and Setup Instructions provide instructions for several critical CRU's. If you are unable to access these instructions or if you have difficulty replacing a CRU, you can use either of the following additional resources: © Copyright Lenovo 2007 57

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Appendix
B.
Customer
Replaceable
Units
(CRUs)
Customer
Replaceable
Units
(CRUs)
are
computer
parts
that
can
be
upgraded
or
replaced
by
the
customer.
There
are
two
types
of
CRUs:
internal
and
external.
External
CRUs
are
easy
to
install,
whereas
internal
CRUs
require
some
technical
skills
and
in
some
cases
might
require
tools
such
as
a
screwdriver.
However,
both
internal
and
external
CRUs
are
safe
for
removal
by
the
customer.
Customers
are
responsible
for
replacing
all
external
CRUs.
Internal
CRUs
can
be
removed
and
installed
by
customers
or
by
a
Lenovo
service
technician
during
the
warranty
period.
Your
computer
contains
the
following
types
of
external
CRUs:
v
External
CRUs
(pluggable):
These
CRUs
unplug
from
the
computer.
Examples
of
these
types
of
CRUs
include
the
AC
adapter
and
power
cord.
v
External
CRUs
with
latches:
These
CRUs
include
a
latch
to
help
you
remove
and
replace
the
part.
Examples
of
these
types
of
CRUs
include
the
notebook
main
battery
and
devices
such
as
an
optical
drive,
a
hard-disk
drive,
and
an
extended
battery.
Your
computer
contains
the
following
types
of
internal
CRUs:
v
Internal
CRUs
(located
behind
an
access
panel):
These
CRUs
are
isolated
parts
within
the
computer
that
are
concealed
by
an
access
panel
that
is
typically
secured
by
either
one
or
two
screws.
Once
the
access
panel
is
removed,
only
the
specific
CRU
is
visible.
Examples
of
these
types
of
CRUs
include
memory
modules
and
storage
devices.
v
Internal
CRUs
(located
within
the
product):
These
CRUs
are
accessible
only
by
opening
the
computer’s
outer
case.
Examples
of
these
CRUs
include
PCI
Express
Mini
Cards
and
the
integrated
keyboard.
Online
Access
Help
provides
instructions
for
replacing
internal
and
external
CRUs.
To
start
the
Access
Help
program,
click
Start
,
move
the
pointer
to
All
Programs
;
then
to
ThinkVantage
.
Click
Access
Help
.
Additionally,
the
Service
and
Troubleshooting
Guide
(this
guide)
and
Setup
Instructions
provide
instructions
for
several
critical
CRU’s.
If
you
are
unable
to
access
these
instructions
or
if
you
have
difficulty
replacing
a
CRU,
you
can
use
either
of
the
following
additional
resources:
©
Copyright
Lenovo
2007
57