5.
Use
the
handle
to
pull
the
power
supply
out
of
the
EXN1000
expansion
unit.
CAUTION:
When
removing
a
power
supply,
always
use
two
hands
to
support
its
weight.
Installing
a
power
supply
To
install
a
power
supply
in
an
EXN1000
expansion
unit,
complete
the
following
steps:
CAUTION:
Do
not
use
excessive
force
when
sliding
the
power
supply
into
the
EXN1000
expansion
unit.
You
can
damage
the
connector.
1.
Put
on
the
antistatic
ESD
strap
and
grounding
leash.
2.
Slide
the
power
supply
in
the
power
supply
bay
until
you
hear
the
power
supply
connect
with
the
connector
inside
the
EXN1000
expansion
unit
chassis.
3.
Raise
the
handle
and
push
it
into
place.
4.
Using
your
thumb
and
index
finger,
press
the
cam
mechanism
levers
toward
each
other
to
engage
the
power
supply
into
place.
5.
Plug
the
power
cord
into
the
power
receptacle
and
fasten
it
with
the
clamp.
6.
Plug
the
other
end
of
the
power
cord
into
a
grounded
AC
power
source.
7.
Turn
on
the
power
switch.
Replacing
an
AT-FCX
module
The
AT-FCX
module
in
an
EXN1000
expansion
unit
includes
a
SCSI-3
Enclosure
Services
Processor.
It
maintains
the
integrity
of
the
loop
when
disks
are
swapped
and
provides
signal
retiming
for
enhanced
loop
stability.
There
are
two
AT-FCX
modules
in
the
middle
of
the
rear
of
the
EXN1000
expansion
unit,
one
for
Channel
A
and
one
for
Channel
B.
Note:
The
Input
and
Output
ports
on
module
A
on
the
EXN1000
expansion
unit
are
inverted
from
module
B.
OPEN
OPEN
Figure
12.
Cam
mechanism
Chapter
4.
Replacing
EXN1000
expansion
unit
devices
35
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