14.
Use
the
vacuum
pen
1
to
lower
the
microprocessor
straight
down
into
the
microprocessor
socket.
15.
Lower
the
microprocessor
retainer
and
secure
it
with
the
lever.
Note:
There
will
be
a
black
plastic
cover
on
the
microprocessor
retainer
to
protect
the
socket
on
the
new
system
board.
When
you
lock
the
microprocessor
in
position,
remove
the
black
plastic
cover.
Place
the
black
plastic
cover
on
the
microprocessor
retainer
of
the
defective
system
board.
16.
Install
and
secure
the
heat
sink
on
the
microprocessor.
17.
Remove
the
memory
modules
from
the
defective
system
board,
and
install
them
on
the
new
system
board.
See
to
“Replacing
a
memory
module”
on
page
17.
Return
here
after
installing
the
memory
modules
and
continue
to
the
next
step.
18.
Install
the
new
system
board
assembly
into
the
computer
chassis
by
aligning
the
tabs
on
the
rear
of
the
system
board
with
the
slots
in
the
rear
of
the
computer
chassis.
Slide
the
system
board
toward
the
rear
of
the
chassis.
19.
Reconnect
the
cables
that
were
disconnected
from
the
system
board.
Make
sure
all
cables
are
routed
correctly.
See
“Identifying
parts
on
the
system
board”
on
page
4.
20.
Reinstall
the
PCI
riser
assembly
and
adapters.
21.
Go
to
“Completing
the
CRU
replacement”
on
page
28.
Replacing
the
microprocessor
Attention
Do
not
open
your
computer
or
attempt
any
repair
before
reading
the
“Important
safety
information”
in
the
Quick
Reference
that
was
included
with
your
computer
or
in
the
Hardware
Maintenance
Manual
(HMM)
for
the
computer.
To
obtain
copies
of
the
Quick
Reference
or
the
HMM
,
go
to
the
Support
Web
site
at
http://www.lenovo.com/think/support.
This
section
provides
instructions
on
how
to
replace
the
microprocessor.
Important
Turn
off
your
computer
for
at
least
one
hour
before
removing
the
microprocessor
to
allow
the
thermal
interface
between
the
microprocessor
and
the
heat
sink
time
to
cool
down.
12
Hardware
Replacement
Guide
Summary of Contents for ThinkCentre 8099
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Page 6: ...iv Hardware Replacement Guide ...
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