Lenovo ThinkCentre M51 Hardware Maintenance Manual - Page 110
Remove, system, board, rotating, lever, securing, until, fully, position., Carefully, board.,
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3. Remove the heat sink 2 from the system board by rotating the lever 1 securing the heat sink until it is fully in the up position. Carefully lift the heat sink off the system board. Note: If you are replacing the system board, place the heat sink on its side on a clean, flat surface. You must later install the heat sink on the new system board. 104 Hardware Maintenance Manual
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3.
Remove
the
heat
sink
±2²
from
the
system
board
by
rotating
the
lever
±1²
securing
the
heat
sink
until
it
is
fully
in
the
up
position.
Carefully
lift
the
heat
sink
off
the
system
board.
Note:
If
you
are
replacing
the
system
board,
place
the
heat
sink
on
its
side
on
a
clean,
flat
surface.
You
must
later
install
the
heat
sink
on
the
new
system
board.
104
Hardware
Maintenance
Manual