Lenovo ThinkCentre M50 Hardware Maintenance Manual (HMM) - Page 66

installing

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4. Loosen the two captured screws 3 holding the fan and heat sink in place, and pivot them to the side. 5. To remove the fan and heat sink 1 from the microprocessor 2 , gently twist the fan and heat sink to break the seal formed by the thermal grease and remove. Note: If the thermal grease seal cannot be broken, you may want to start up the system to heat the processor and loosen the thermal grease. 6. Place the heat sink on a clean work surface. 7. Take notice of the orientation of the beveled corner on the microprocessor. This is important when reinstalling the microprocessor on the system board. 8. Release the microprocessor from the system board by pulling outward and lifting the small handle on the microprocessor socket to its maximum vertical position. Carefully lift the microprocessor off the socket. To replace the microprocessor, do the following: 1. Make sure that the microprocessor socket handle is fully in the vertical position. Otherwise the microprocessor pins might be damaged when installing the microprocessor. 2. Position the microprocessor so that the pins are aligned with the socket and with the beveled corner in the correct orientation. 3. Lower the handle until it is fully in the down position and locked into the socket. This secures the microprocessor in the socket. 4. Remove the cleaning pad from its package and use the cleaning pad to wipe the thermal grease from the bottom of the heat sink. Notes: a. The cleaning pad and thermal grease are separate FRUs and are not included with the system board or microprocessor FRUs. These must be ordered separately and shipped along with the FRUs being replaced. b. Be sure that all of the thermal grease is removed. 5. Use the thermal grease syringe to place 16 uniformly spaced dots of 0.01ML each on the top of the microprocessor. 60 Hardware Maintenance Manual

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4.
Loosen
the
two
captured
screws
±3²
holding
the
fan
and
heat
sink
in
place,
and
pivot
them
to
the
side.
5.
To
remove
the
fan
and
heat
sink
±1²
from
the
microprocessor
±2²
,
gently
twist
the
fan
and
heat
sink
to
break
the
seal
formed
by
the
thermal
grease
and
remove.
Note:
If
the
thermal
grease
seal
cannot
be
broken,
you
may
want
to
start
up
the
system
to
heat
the
processor
and
loosen
the
thermal
grease.
6.
Place
the
heat
sink
on
a
clean
work
surface.
7.
Take
notice
of
the
orientation
of
the
beveled
corner
on
the
microprocessor.
This
is
important
when
reinstalling
the
microprocessor
on
the
system
board.
8.
Release
the
microprocessor
from
the
system
board
by
pulling
outward
and
lifting
the
small
handle
on
the
microprocessor
socket
to
its
maximum
vertical
position.
Carefully
lift
the
microprocessor
off
the
socket.
To
replace
the
microprocessor,
do
the
following:
1.
Make
sure
that
the
microprocessor
socket
handle
is
fully
in
the
vertical
position.
Otherwise
the
microprocessor
pins
might
be
damaged
when
installing
the
microprocessor.
2.
Position
the
microprocessor
so
that
the
pins
are
aligned
with
the
socket
and
with
the
beveled
corner
in
the
correct
orientation.
3.
Lower
the
handle
until
it
is
fully
in
the
down
position
and
locked
into
the
socket.
This
secures
the
microprocessor
in
the
socket.
4.
Remove
the
cleaning
pad
from
its
package
and
use
the
cleaning
pad
to
wipe
the
thermal
grease
from
the
bottom
of
the
heat
sink.
Notes:
a.
The
cleaning
pad
and
thermal
grease
are
separate
FRUs
and
are
not
included
with
the
system
board
or
microprocessor
FRUs.
These
must
be
ordered
separately
and
shipped
along
with
the
FRUs
being
replaced.
b.
Be
sure
that
all
of
the
thermal
grease
is
removed.
5.
Use
the
thermal
grease
syringe
to
place
16
uniformly
spaced
dots
of
0.01ML
each
on
the
top
of
the
microprocessor.
60
Hardware
Maintenance
Manual