IBM 8837 User Manual - Page 77

Installation, Instructions

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Light Path diagnostic button (SW 2) Light Path activity LED (CR 60) After ac power has been removed from the server, power remains available to the LEDs for up to 12 hours. After 12 hours, you must turn on the server to supply power to the LEDs. Complete the following steps to view the LEDs with the server cover removed: 1. Turn off the server and all peripheral devices; then, disconnect all external cables from the server. 2. Slide the server out of the rack cabinet. 3. Remove the server cover. 4. Press and hold the blue Light Path diagnostic button on the system board. The system board LEDs that indicate the component failure will be lit while you press the Light Path diagnostic button. You can light the LEDs for a maximum of 2 minutes, after which power is no longer available for the LEDs. Look for any LEDs that are lit on the system board to find the failing component. Note: Sometimes no Light Path diagnostic LEDs are lit on the system board when a failure occurs. To make sure that these LEDs are supposed to be off and that the Light Path diagnostic circuits are working correctly there is a Light Path activity LED (see previous illustration). When you press the Light Path diagnostic button and the Light Path activity LED lights, this indicates that the Light Path diagnostic circuitry is working properly and that no LEDs should be lit with this particular error. 5. Install the server cover; then, slide the server into the rack cabinet and connect all external cables. See the Rack Installation Instructions for information about how to install the server into rack cabinet. The following illustration shows the LEDs on the Light Path diagnostics panel. See "Light Path diagnostics LEDs" on page 66 for information about the LED meanings. Chapter 6. Solving problems 65

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Light Path
activity LED (CR 60)
Light Path diagnostic
button (SW 2)
After
ac
power
has
been
removed
from
the
server,
power
remains
available
to
the
LEDs
for
up
to
12
hours.
After
12
hours,
you
must
turn
on
the
server
to
supply
power
to
the
LEDs.
Complete
the
following
steps
to
view
the
LEDs
with
the
server
cover
removed:
1.
Turn
off
the
server
and
all
peripheral
devices;
then,
disconnect
all
external
cables
from
the
server.
2.
Slide
the
server
out
of
the
rack
cabinet.
3.
Remove
the
server
cover.
4.
Press
and
hold
the
blue
Light
Path
diagnostic
button
on
the
system
board.
The
system
board
LEDs
that
indicate
the
component
failure
will
be
lit
while
you
press
the
Light
Path
diagnostic
button.
You
can
light
the
LEDs
for
a
maximum
of
2
minutes,
after
which
power
is
no
longer
available
for
the
LEDs.
Look
for
any
LEDs
that
are
lit
on
the
system
board
to
find
the
failing
component.
Note:
Sometimes
no
Light
Path
diagnostic
LEDs
are
lit
on
the
system
board
when
a
failure
occurs.
To
make
sure
that
these
LEDs
are
supposed
to
be
off
and
that
the
Light
Path
diagnostic
circuits
are
working
correctly
there
is
a
Light
Path
activity
LED
(see
previous
illustration).
When
you
press
the
Light
Path
diagnostic
button
and
the
Light
Path
activity
LED
lights,
this
indicates
that
the
Light
Path
diagnostic
circuitry
is
working
properly
and
that
no
LEDs
should
be
lit
with
this
particular
error.
5.
Install
the
server
cover;
then,
slide
the
server
into
the
rack
cabinet
and
connect
all
external
cables.
See
the
Rack
Installation
Instructions
for
information
about
how
to
install
the
server
into
rack
cabinet.
The
following
illustration
shows
the
LEDs
on
the
Light
Path
diagnostics
panel.
See
“Light
Path
diagnostics
LEDs”
on
page
66
for
information
about
the
LED
meanings.
Chapter
6.
Solving
problems
65