Lenovo 9935B3U User Manual - Page 40

Replacing, assembly

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Replacing the heat sink and 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 heat sink and fan assembly. CAUTION: The heat sink and fan assembly 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 heat sink and fan assembly: 1. Remove the computer cover. See "Removing the computer cover" on page 14. 2. Disconnect the heat sink and the fan assembly cable from the system board. See "Locating parts on the system board" on page 11. 3. Remove the fan plenum from the heat sink and fan assembly. See "Locating components" on page 10. 4. Pivot the handle 1 to release the heat sink clamp and then disengage the clamp from the plastic retention bracket. Note: The system board for your computer might look different to the one illustrated below. Figure 31. Removing the heat sink and fan assembly held in place by a clamp 32 User Guide

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Replacing
the
heat
sink
and
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
heat
sink
and
fan
assembly.
CAUTION:
The
heat
sink
and
fan
assembly
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
heat
sink
and
fan
assembly:
1.
Remove
the
computer
cover.
See
“Removing
the
computer
cover”
on
page
14.
2.
Disconnect
the
heat
sink
and
the
fan
assembly
cable
from
the
system
board.
See
“Locating
parts
on
the
system
board”
on
page
11.
3.
Remove
the
fan
plenum
from
the
heat
sink
and
fan
assembly.
See
“Locating
components”
on
page
10.
4.
Pivot
the
handle
±1²
to
release
the
heat
sink
clamp
and
then
disengage
the
clamp
from
the
plastic
retention
bracket.
Note:
The
system
board
for
your
computer
might
look
different
to
the
one
illustrated
below.
Figure
31.
Removing
the
heat
sink
and
fan
assembly
held
in
place
by
a
clamp
32
User
Guide