7.
Close
the
microprocessor-release
lever
to
secure
the
microprocessor.
Attention:
v
Do
not
set
the
heat
sink
down
after
you
remove
the
plastic
cover.
v
Do
not
touch
or
contaminate
the
thermal
grease
on
the
bottom
of
the
new
heat
sink.
Doing
so
damages
its
heat-conducting
capability
and
exposes
the
new
microprocessor
to
overheating.
v
If
you
must
remove
the
heat
sink
after
installing
it,
note
that
the
thermal
grease
might
have
formed
a
strong
bond
between
the
heat
sink
and
the
microprocessor.
Do
not
force
the
heat
sink
and
microprocessor
apart;
doing
so
can
damage
the
microprocessor
pins.
Loosen
one
captive
screw
fully
before
loosening
the
other
captive
screw
to
help
break
the
bond
between
the
components
without
damaging
them.
8.
Remove
the
cover
from
the
bottom
of
the
heat
sink
and
make
sure
that
the
thermal
grease
is
still
on
the
bottom
of
the
heat
sink.
9.
Install
the
heat
sink
on
top
of
the
microprocessor,
and
tighten
the
captive
screws.
Alternate
between
the
screws
until
they
are
tight,
making
sure
that
you
do
not
overtighten
them.
Microprocessor
orientation indicator
Microprocessor-
release lever
Microprocessor
connector
Microprocessor
Figure
29.
Microprocessor
installation
38
xSeries
336
Type
1879
and
Type
8837:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide
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