8.
Alternate
tightening
each
screw
a
small
and
equal
amount
until
the
heat
sink
and
fan
assembly
is
secured
to
the
system
board.
Do
not
over-tighten
the
screws.
9.
Connect
the
new
heat
sink
and
fan
assembly
cable
to
the
microprocessor
fan
connector
on
the
system
board.
10.
Go
to
“Completing
the
parts
replacement”
on
page
47.
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
computer
cover.
See
“Removing
the
computer
cover”
on
page
14.
2.
Lay
the
computer
on
its
side
for
easier
access
to
the
system
board.
3.
Remove
any
parts
or
cables
that
may
prevent
your
access
to
the
system
board.
4.
Disconnect
the
heat
sink
and
fan
assembly
cable
from
the
microprocessor
fan
connector
on
the
system
board.
See
“Locating
parts
on
the
system
board”
on
page
11.
5.
Remove
the
heat
sink
and
fan
assembly.
See
“Replacing
the
heat
sink
and
fan
assembly”
on
page
28.
6.
Place
the
heat
sink
and
fan
assembly
on
its
side
so
that
the
thermal
grease
does
not
come
in
contact
with
anything.
30
User
Guide
Summary of Contents for 7515D9U
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Page 82: ...11 Reconnect the mouse cable to the computer 12 Turn your computer back on 74 User Guide ...
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Page 94: ...Part Number 53Y6259 Printed in USA 1P P N 53Y6259 ...