IBM 8671 Hardware Maintenance Manual - Page 48

Power-supply, Light, diagnostics

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Power-supply LEDs The ac and dc power LEDs on the power supply provide status information about the power supply. The following illustration shows the location of the ac and dc power LEDs. Note: The following illustration shows the rear of the server with two hot-swap power supplies installed. A server with a single fixed power supply is similar. Power supply 1 AC power LED (green) DC power LED (green) Fan 1 LED Fan 2 LED Power supply 2 AC power LED (green) DC power LED (green) 1 2 Ethernet link status LED PCI-X slot 5 attention LED PCI-X slot 6 attention LED NMI button (service use only) For more information about the ac and dc power LEDs, see "Power-supply LED errors" on page 146. Light path diagnostics If the system error LED in the operator information panel on the front of the server is on, one or more LEDs inside the server might be on. Use the light path diagnostics panel to quickly identify the type of error that occurred. For LED locations, see "System-board LED locations" on page 53. Your server is designed so that LEDs remain lit when the server shuts down, provided that the power supplies are operating properly. This feature helps you to isolate the problem even if an error causes the server to shut down. 38 xSeries 235 Type 8671: Hardware Maintenance Manual and Troubleshooting Guide

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Power-supply
LEDs
The
ac
and
dc
power
LEDs
on
the
power
supply
provide
status
information
about
the
power
supply.
The
following
illustration
shows
the
location
of
the
ac
and
dc
power
LEDs.
Note:
The
following
illustration
shows
the
rear
of
the
server
with
two
hot-swap
power
supplies
installed.
A
server
with
a
single
fixed
power
supply
is
similar.
1
2
AC power LED
(green)
AC power LED
(green)
DC power LED
(green)
DC power LED
(green)
Ethernet link
status LED
PCI-X slot 5
attention LED
PCI-X slot 6
attention LED
Power supply 2
Power supply 1
Fan 1 LED
Fan 2 LED
NMI button
(service use only)
For
more
information
about
the
ac
and
dc
power
LEDs,
see
“Power-supply
LED
errors”
on
page
146.
Light
path
diagnostics
If
the
system
error
LED
in
the
operator
information
panel
on
the
front
of
the
server
is
on,
one
or
more
LEDs
inside
the
server
might
be
on.
Use
the
light
path
diagnostics
panel
to
quickly
identify
the
type
of
error
that
occurred.
For
LED
locations,
see
“System-board
LED
locations”
on
page
53.
Your
server
is
designed
so
that
LEDs
remain
lit
when
the
server
shuts
down,
provided
that
the
power
supplies
are
operating
properly.
This
feature
helps
you
to
isolate
the
problem
even
if
an
error
causes
the
server
to
shut
down.
38
xSeries
235
Type
8671:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide