Chapter 2. Installation
19
2.5.2
Top
cover
Removal
/
Replacement
for
internal
access
Normally,
there
is
no
need
to
remove
the
cover
of
the
unit.
All
interfaces
are
fixed
and
no
user
serviceable
components
are
inside.
However,
to
change
any
AC
or
DC
power
module,
add
the
SNMP
feature,
internal
access
is
required
and
the
cover
must
be
removed.
***CAUTION***
This
procedure
should
only
be
performed
by
qualified
service
personnel.
In
addition,
all
power
connections
must
be
removed
before
even
attempting
to
open
the
case.
1.
If
the
unit
is
installed
in
a
rack,
it
must
be
removed
along
with
all
power
connections.
2.
The
rack
mounting
brackets,
if
installed,
need
not
be
removed.
3.
The
top
cover
is
held
in
place
by
eight
screws.
4.
Once
all
eight
screws
are
removed,
the
top
panel
just
lifts
off.
The
internals
are
now
exposed.
Follow
the
procedure
in
reverse
to
re
‐
install
the
top
panel.
Install
the
screws
but
at
first
do
not
tighten.
Make
sure
all
eight
screws
are
started
and
not
cross
threaded,
then
tighten
them
in
a
crisscross
pattern.
The
screws
are
only
3mm,
so
do
not
over
tighten
or
they
may
become
stripped
or
broken.
Re
‐
install
the
rack
mount
ears
if
they
were
removed.
Figure
2
‐
7
:
Top
cover
removal
(while
out
of
service)
Summary of Contents for FMUX160
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