Lenovo 9935B3U User Manual - Page 41

Replacing, system, assembly

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Note: You might have to gently twist the heat sink and fan assembly to free it from the microprocessor. 5. Lift the failing heat sink and fan assembly off the system board. 6. Remove the mylar film that covers the greased side of the new heat sink and fan assembly that will face the microprocessor. 7. Position the heat sink and fan assembly on the microprocessor socket and then position the clamp on the plastic retention bracket. Pivot the handle 1 to clamp the heat sink and fan assembly to the plastic retention bracket. Figure 32. Clamping the heat sink and fan assembly to the plastic retention bracket 8. Reconnect the heat sink and the fan assembly cable to the microprocessor fan connector on the system board. 9. Go to "Completing the parts replacement" on page 37. Replacing the system fan assembly 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 system fan assembly. To replace the system fan assembly: 1. Remove the computer cover. See "Removing the computer cover" on page 14. 2. Remove the front bezel and drive bay assembly. See "Accessing the system board components and drives" on page 15. 3. Disconnect the system fan assembly cable from the system board. See "Locating parts on the system board" on page 11. 4. Remove the hard disk drive. See "Replacing the hard disk drive" on page 26. Chapter 2. Installing options and replacing hardware 33

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Note:
You
might
have
to
gently
twist
the
heat
sink
and
fan
assembly
to
free
it
from
the
microprocessor.
5.
Lift
the
failing
heat
sink
and
fan
assembly
off
the
system
board.
6.
Remove
the
mylar
film
that
covers
the
greased
side
of
the
new
heat
sink
and
fan
assembly
that
will
face
the
microprocessor.
7.
Position
the
heat
sink
and
fan
assembly
on
the
microprocessor
socket
and
then
position
the
clamp
on
the
plastic
retention
bracket.
Pivot
the
handle
±1²
to
clamp
the
heat
sink
and
fan
assembly
to
the
plastic
retention
bracket.
8.
Reconnect
the
heat
sink
and
the
fan
assembly
cable
to
the
microprocessor
fan
connector
on
the
system
board.
9.
Go
to
“Completing
the
parts
replacement”
on
page
37.
Replacing
the
system
fan
assembly
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:
This
section
provides
instructions
on
how
to
replace
the
system
fan
assembly.
To
replace
the
system
fan
assembly:
1.
Remove
the
computer
cover.
See
“Removing
the
computer
cover”
on
page
14.
2.
Remove
the
front
bezel
and
drive
bay
assembly.
See
“Accessing
the
system
board
components
and
drives”
on
page
15.
3.
Disconnect
the
system
fan
assembly
cable
from
the
system
board.
See
“Locating
parts
on
the
system
board”
on
page
11.
4.
Remove
the
hard
disk
drive.
See
“Replacing
the
hard
disk
drive”
on
page
26.
Figure
32.
Clamping
the
heat
sink
and
fan
assembly
to
the
plastic
retention
bracket
Chapter
2.
Installing
options
and
replacing
hardware
33