Lenovo ThinkCentre M51 Hardware Maintenance Manual - Page 136
Close, microprocessor, retainer, secure, lever, replacing, system, board, black, protective, cover,
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9. Close the microprocessor retainer 3 and then secure the retainer with the lever 2 . Note: If you are replacing the system board, a black protective cover on the retainer protects the microprocessor socket. When you close the retainer, remove the cover. 130 Hardware Maintenance Manual
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9.
Close
the
microprocessor
retainer
±3²
and
then
secure
the
retainer
with
the
lever
±2²
.
Note:
If
you
are
replacing
the
system
board,
a
black
protective
cover
on
the
retainer
protects
the
microprocessor
socket.
When
you
close
the
retainer,
remove
the
cover.
130
Hardware
Maintenance
Manual