shows
the
controls
and
LEDs
on
the
light
path
diagnostics
panel.
To
acknowledge
a
system
error
but
not
take
immediate
action,
press
the
remind
button
and
place
light
path
diagnostics
in
Remind
mode.
When
the
server
is
in
Remind
mode,
the
system-error
LED
on
the
front
of
the
server
flashes.
If
a
new
failure
occurs,
the
system-error
LED
is
lit
again.
Press
the
reset
button
to
reset
the
server
and
run
the
power-on
self-test
(POST).
You
might
have
to
use
a
pen
or
the
end
of
a
straightened
paper
clip
to
press
the
button.
The
server
is
designed
so
that
LEDs
remain
lit
when
the
server
is
connected
to
an
AC
power
source
but
is
not
turned
on,
provided
that
the
power
supply
is
operating
correctly.
This
feature
helps
you
to
isolate
the
problem
when
operating
system
is
shut
down.
Diagnosing
problems
using
light
path
diagnostics
LEDs
in
two
locations
on
the
server
are
available
to
help
you
diagnose
problems
that
might
occur
during
installation.
Use
them
in
the
following
order:
1.
Light
path
diagnostics
panel
-
Look
at
this
panel
first.
If
a
system
error
has
occurred,
the
system-error
LED
on
the
front
of
the
light
path
diagnostics
drawer
is
lit.
Slide
the
latch
to
the
left
on
the
front
of
the
light
path
diagnostics
drawer
to
access
the
light
path
diagnostics
panel.
Note
any
LEDs
that
are
lit,
and
then
close
the
drawer.
2.
LEDs
on
the
system
board
-
To
identify
the
component
that
is
causing
the
error,
note
the
lit
LED
on
or
beside
the
component.
Light
path
diagnostics
LEDs
The
following
table
describes
the
LEDs
on
the
light
path
diagnostics
panel,
the
problems
that
they
indicate,
and
actions
to
solve
the
problems.
Figure
7.
Light
path
diagnostics
panel
40
DR550
Version
4.5
Problem
Determination
and
Service
Guide
Summary of Contents for DR550
Page 1: ...IBM System Storage DR550 Version 4 5 Problem Determination and Service Guide GA32 0576 00...
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Page 185: ...DR1 power cabling Figure 88 DR1 Power Cabling Appendix A DR1 and DR2 cabling diagrams 157...
Page 186: ...Figure 89 DR1 Power Cabling 158 DR550 Version 4 5 Problem Determination and Service Guide...
Page 191: ...Figure 96 Expansion Drawer port identification Appendix A DR1 and DR2 cabling diagrams 163...
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Page 258: ...Printed in USA GA32 0576 00...