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Figure
25
shows
the
switch
and
the
lights
on
the
fan-and-power-supply
assembly.
AC
PWR
light
1
The
AC
PWR
light,
which
is
green,
comes
on
when
the
mainline
power
supply
is
connected
to
the
fan-and-power-supply
assembly.
DC
PWR
light
2
The
DC
PWR
light,
which
is
green,
comes
on
when
this
fan-and-power-supply
assembly
is
supplying
power
to
the
2104
Model
DS4
or
Model
TS4.
CHK
light
3
The
CHK
light,
which
is
amber,
indicates
either
that
there
is
a
failure
in
the
fan-and-power-supply
assembly
or
that
the
dc
on/standby
switch
is
set
to
standby.
Note:
This
light
flashes
when
the
failure
in
the
fan-and-power-supply
assembly
is
a
fan
failure.
DC
on/standby
switch
4
The
dc
on/standby
switch
connects
dc
electrical
power
from
the
fan-and-power-supply
assembly
to
the
disk
drives
and
other
components
in
the
2104
Model
DS4
or
Model
TS4.
This
switch
must
be
set
to
on
for
the
fan-and-power-supply
unit
to
start.
If
the
dc
on/standby
switch
on
either
of
the
two
fan-and-power-supply
assemblies
is
set
to
on,
power
in
a
2104
Model
DS4
or
Model
TS4
unit
is
switched
on
automatically
if
all
of
the
following
conditions
exist:
v
Input
power
to
the
2104
Model
DS4
or
Model
TS4
is
present.
v
The
fan-and-power-supply
assembly
is
fully
home
in
its
slot.
v
Either
the
power
control
switch
is
set
to
on,
or
terminator
power
is
active
in
an
external
SCSI
connection.
1
4
2
3
SC000931
Figure
25.
Fan-and-power-supply
assembly
lights
and
switch
10
Expandable
Storage
Plus
2104
Model
DS4
and
Model
TS4
Operator’s
Guide
Содержание Bull Escala 2104 DS4
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