Lenovo ThinkCentre A50 Hardware Maintenance Manual - Page 107

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7. Position the microprocessor so that the pins are aligned with the socket and with the beveled corner 1 on the microprocessor is aligned in the socket as shown. 8. Lower the handle until it is fully in the down position and locked into the socket. This secures the microprocessor in the socket. 9. 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. Note: 0.01ML is one tick mark on the syringe. If the grease is properly applied, approximately half (0.22ML) of the grease will remain in the syringe. 10. Use the thermal grease syringe to place 16 uniformly spaced dots of 0.01ML each on the top of the microprocessor. Microprocessor 0.01 mL of thermal grease 11. Place the heat sink into position on the microprocessor. 12. When tightening the screws that clamp the heat sink, do not overtighten. Tighten the clamp screws evenly by tightening one side some and then the other until they are both snug. 13. Go to "Completing the FRU replacement." on page 104. Chapter 8. Replacing FRUs 101

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7.
Position
the
microprocessor
so
that
the
pins
are
aligned
with
the
socket
and
with
the
beveled
corner
±1²
on
the
microprocessor
is
aligned
in
the
socket
as
shown.
8.
Lower
the
handle
until
it
is
fully
in
the
down
position
and
locked
into
the
socket.
This
secures
the
microprocessor
in
the
socket.
9.
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.
Note:
0.01ML
is
one
tick
mark
on
the
syringe.
If
the
grease
is
properly
applied,
approximately
half
(0.22ML)
of
the
grease
will
remain
in
the
syringe.
10.
Use
the
thermal
grease
syringe
to
place
16
uniformly
spaced
dots
of
0.01ML
each
on
the
top
of
the
microprocessor.
Microprocessor
0.01 mL of
thermal grease
11.
Place
the
heat
sink
into
position
on
the
microprocessor.
12.
When
tightening
the
screws
that
clamp
the
heat
sink,
do
not
overtighten.
Tighten
the
clamp
screws
evenly
by
tightening
one
side
some
and
then
the
other
until
they
are
both
snug.
13.
Go
to
“Completing
the
FRU
replacement.”
on
page
104.
Chapter
8.
Replacing
FRUs
101