6.
Disengage
the
system
board
from
the
chassis
by
sliding
it
toward
the
front
of
the
computer
and
then
lift
it
out.
7.
Place
the
defective
system
board
next
to
the
new
system
board
on
a
clean,
flat
surface.
8.
Note
the
location
of
the
memory
modules
and
remove
them
from
the
failing
system
board
and
install
them
on
the
new
system
board
in
the
same
location
as
they
were
on
the
failing
system
board.
See
“Removing
and
replacing
memory”
on
page
119.
9.
Remove
the
heat
sink
and
microprocessor
from
the
failing
system
board
and
install
them
on
the
new
system
board.
Go
to
“Removing
and
replacing
the
microprocessor”
on
page
126.
Return
here
after
removing
and
replacing
the
microprocessor.
Chapter
9.
Replacing
FRUs
(Types
8143,
8144,
8146,
8422,
8423,
and
8427)
125
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