Lenovo ThinkCentre M51 Hardware Maintenance Manual - Page 109

Removing, replacing, microprocessor

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Important If the metal plate is not aligned correctly when you install the screws, you might damage the system board. 9. Install the screws that secure the system board to the chassis. 10. Reconnect all cables that were disconnected from the system board. See "Identifying parts on the system board" on page 95. 11. Replace any PCI adapters that were removed. See "Removing and replacing a PCI adapter" on page 97. 12. To complete the installation, go to "Closing the cover and connecting cables" on page 113. Removing and replacing the microprocessor Important To allow the thermal interface between the microprocessor and the heat sink time to cool down, turn off the computer at least one hour before removing the microprocessor. Note: This procedure is also used when replacing a failing system board. When you receive a new microprocessor, you will also receive a new heat sink and a vacuum pen for handling the microprocessor. Important You must install the new heat sink when replacing the microprocessor. If you use the old heat sink with the new microprocessor, the computer might over heat. 1. Remove the cover. See "Removing the cover" on page 92. 2. Rotate the drive bay assembly upward to gain access to the system board. * XXXXXXXXX* * XXXXXXXXX* Chapter 8. Replacing FRUs (Types 8095, 8141, 8142, 8145, 8420, and 8421) 103

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Important
If
the
metal
plate
is
not
aligned
correctly
when
you
install
the
screws,
you
might
damage
the
system
board.
9.
Install
the
screws
that
secure
the
system
board
to
the
chassis.
10.
Reconnect
all
cables
that
were
disconnected
from
the
system
board.
See
“Identifying
parts
on
the
system
board”
on
page
95.
11.
Replace
any
PCI
adapters
that
were
removed.
See
“Removing
and
replacing
a
PCI
adapter”
on
page
97.
12.
To
complete
the
installation,
go
to
“Closing
the
cover
and
connecting
cables”
on
page
113.
Removing
and
replacing
the
microprocessor
Important
To
allow
the
thermal
interface
between
the
microprocessor
and
the
heat
sink
time
to
cool
down,
turn
off
the
computer
at
least
one
hour
before
removing
the
microprocessor.
Note:
This
procedure
is
also
used
when
replacing
a
failing
system
board.
When
you
receive
a
new
microprocessor,
you
will
also
receive
a
new
heat
sink
and
a
vacuum
pen
for
handling
the
microprocessor.
Important
You
must
install
the
new
heat
sink
when
replacing
the
microprocessor.
If
you
use
the
old
heat
sink
with
the
new
microprocessor,
the
computer
might
over
heat.
1.
Remove
the
cover.
See
“Removing
the
cover”
on
page
92.
2.
Rotate
the
drive
bay
assembly
upward
to
gain
access
to
the
system
board.
Chapter
8.
Replacing
FRUs
(Types
8095,
8141,
8142,
8145,
8420,
and
8421)
103