Lenovo ThinkCentre M55e Hardware Maintenance Manual - Page 97

contaminated.

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8. Place the failing system board next to the new system board on a clean, flat surface. 9. Remove all memory modules from the failing system board and install them in the same connectors on the new system board. See "Identifying parts on the system board" on page 85. 10. Remove the heat sink from the failing system board by pivoting the lever 1 until it is fully in the vertical position. Carefully lift the heat sink off of the failing system board. Note: Place the heat sink on its side on a clean, flat surface so the thermal grease on the bottom of the heat sink does not touch the surface and become contaminated. 11. To remove the microprocessor from the failing system board, release the lever 1 securing the microprocessor 3 then pivot the microprocessor retainer 2 until it is fully open. Chapter 8. Replacing FRUs 91

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8.
Place
the
failing
system
board
next
to
the
new
system
board
on
a
clean,
flat
surface.
9.
Remove
all
memory
modules
from
the
failing
system
board
and
install
them
in
the
same
connectors
on
the
new
system
board.
See
“Identifying
parts
on
the
system
board”
on
page
85.
10.
Remove
the
heat
sink
from
the
failing
system
board
by
pivoting
the
lever
±1²
until
it
is
fully
in
the
vertical
position.
Carefully
lift
the
heat
sink
off
of
the
failing
system
board.
Note:
Place
the
heat
sink
on
its
side
on
a
clean,
flat
surface
so
the
thermal
grease
on
the
bottom
of
the
heat
sink
does
not
touch
the
surface
and
become
contaminated.
11.
To
remove
the
microprocessor
from
the
failing
system
board,
release
the
lever
±1²
securing
the
microprocessor
±3²
then
pivot
the
microprocessor
retainer
±2²
until
it
is
fully
open.
Chapter
8.
Replacing
FRUs
91