19.
Install
the
retention
module
for
the
heat
sink
and
fan
assembly
on
the
system
board.
20.
Install
the
heat
sink
and
fan
assembly
on
the
new
system
board.
21.
Reconnect
the
heat
sink
and
fan
assembly
cable
to
the
system
board.
See
“Locating
parts
on
the
system
board”
on
page
119.
22.
Install
the
new
system
board
into
the
chassis
and
align
the
screw
holes
with
those
in
the
chassis.
Insert
and
tighten
the
screws
that
secure
the
system
board.
23.
Reinstall
the
hard
disk
drive.
See
“Replacing
the
hard
disk
drive”
on
page
132.
24.
Align
the
drive
bay
assembly
with
the
two
slots
and
rails
on
the
sides
of
the
chassis,
reconnect
the
drive
cables
to
the
system
board,
and
then
slide
the
drive
bay
assembly
towards
the
rear
of
the
chassis
until
it
snaps
into
position.
25.
Reconnect
the
remaining
cables
to
the
system
board.
26.
Reinstall
the
front
bezel.
27.
Reinstall
any
PCI
adapter
cards
that
were
removed.
28.
Position
the
fan
duct
on
the
heat
sink
fan.
29.
Go
to
“Completing
the
FRU
replacement”
on
page
140.
Replacing
the
microprocessor
Attention
Do
not
open
your
computer
or
attempt
any
repair
before
reading
and
understanding
the
“Important
safety
information”
in
the
ThinkCentre
Safety
and
Warranty
Guide
that
came
with
your
computer.
To
obtain
a
copy
of
the
ThinkCentre
Safety
and
Warranty
Guide
,
go
to:
http://www.lenovo.com/support
This
section
provides
instructions
on
how
to
replace
the
microprocessor.
CAUTION:
The
heat
sink
and
microprocessor
might
be
very
hot.
Turn
off
the
computer
and
wait
three
to
five
minutes
to
let
the
computer
cool
before
removing
the
computer
cover.
To
replace
the
microprocessor:
1.
Remove
the
cover.
See
“Removing
the
computer
cover”
on
page
117.
2.
Lift
the
fan
duct
off
the
heat
sink
fan.
3.
Disconnect
the
heat
sink
and
fan
assembly
cable
from
the
system
board.
See
“Locating
parts
on
the
system
board”
on
page
119.
Chapter
9.
Replacing
FRUs
-
Desktop
computers
129
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