IBM 86884RX Maintenance Manual - Page 47

diagnostics, panel, server, system, boards, Diagnostic, display

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error that occurred, and see "Light Path LED errors" on page 147 to help determine the cause of the error and the action you should take. To view the LEDs on the various main boards, look at the board indicated by the diagnostic panel. To acknowledge a system error but not take immediate action, press the REMIND button, and place the Light Path Diagnostics feature in Remind mode. The system-error LED flashes in Remind mode. If a new failure occurs, the system-error LED is lit again. The diagnostics panel The diagnostics panel should be the first place you look for help with identifying problems. If a system error occurs, the system-error LED on the front of this panel is lit. Press the front of the panel to open the diagnostics panel, and look for any lit LEDs. These lit LEDs can help you identify the possible cause of the error. Make a note of any LEDs that are lit, and then close the panel. LEDs on the top of the server You can also use the LEDs on the top of the server to find an error. If the BOARD LED on the diagnostics panel is lit, pull the server out, and view the top cover. In the center of the top cover is a set of six LEDs and the system service labels. The numbers next to the LEDs correspond to the numbers on the system service label. Note the lit LED, and see the numbered block on the system service label that corresponds to the lit LED. Then, follow the instructions, if any, in the numbered block. LEDs on the system boards To locate the actual component that caused the error, locate the lit LED next to that component. For example: A system error has occurred, and you have noted that the CPU LED is lit on the diagnostics panel. Referring to the LEDs on the top cover, you see that LED 2 is lit. You then locate the panel on the system service label with the number 2 on it. In this case, the instructions in the panel tell you that the problem occurred with one of the microprocessors. Follow the instructions to remove the processor-board assembly. See "Processor-board assembly" on page 119. Located on the circuit board is the light-path capacitor switch. Press and hold the switch until you locate the lit LED next to the defective microprocessor. Follow the instructions in "Microprocessor and power module" on page 121 and "Installing and replacing a microprocessor and power module" on page 100 to remove and replace the microprocessor. For more information about LEDs and connectors, see "Connector and LED locations" on page 80. Diagnostic display If a problem is detected with system power on or during initialization, the two-hex character diagnostic display on the midplane board might show an error code. See "Midplane board connectors and LEDs" on page 84 and "Diagnostic display error codes" on page 181 for more information. Chapter 3. Diagnostics 37

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error
that
occurred,
and
see
“Light
Path
LED
errors”
on
page
147
to
help
determine
the
cause
of
the
error
and
the
action
you
should
take.
To
view
the
LEDs
on
the
various
main
boards,
look
at
the
board
indicated
by
the
diagnostic
panel.
To
acknowledge
a
system
error
but
not
take
immediate
action,
press
the
REMIND
button,
and
place
the
Light
Path
Diagnostics
feature
in
Remind
mode.
The
system-error
LED
flashes
in
Remind
mode.
If
a
new
failure
occurs,
the
system-error
LED
is
lit
again.
The
diagnostics
panel
The
diagnostics
panel
should
be
the
first
place
you
look
for
help
with
identifying
problems.
If
a
system
error
occurs,
the
system-error
LED
on
the
front
of
this
panel
is
lit.
Press
the
front
of
the
panel
to
open
the
diagnostics
panel,
and
look
for
any
lit
LEDs.
These
lit
LEDs
can
help
you
identify
the
possible
cause
of
the
error.
Make
a
note
of
any
LEDs
that
are
lit,
and
then
close
the
panel.
LEDs
on
the
top
of
the
server
You
can
also
use
the
LEDs
on
the
top
of
the
server
to
find
an
error.
If
the
BOARD
LED
on
the
diagnostics
panel
is
lit,
pull
the
server
out,
and
view
the
top
cover.
In
the
center
of
the
top
cover
is
a
set
of
six
LEDs
and
the
system
service
labels.
The
numbers
next
to
the
LEDs
correspond
to
the
numbers
on
the
system
service
label.
Note
the
lit
LED,
and
see
the
numbered
block
on
the
system
service
label
that
corresponds
to
the
lit
LED.
Then,
follow
the
instructions,
if
any,
in
the
numbered
block.
LEDs
on
the
system
boards
To
locate
the
actual
component
that
caused
the
error,
locate
the
lit
LED
next
to
that
component.
For
example:
A
system
error
has
occurred,
and
you
have
noted
that
the
CPU
LED
is
lit
on
the
diagnostics
panel.
Referring
to
the
LEDs
on
the
top
cover,
you
see
that
LED
2
is
lit.
You
then
locate
the
panel
on
the
system
service
label
with
the
number
2
on
it.
In
this
case,
the
instructions
in
the
panel
tell
you
that
the
problem
occurred
with
one
of
the
microprocessors.
Follow
the
instructions
to
remove
the
processor-board
assembly.
See
“Processor-board
assembly”
on
page
119.
Located
on
the
circuit
board
is
the
light-path
capacitor
switch.
Press
and
hold
the
switch
until
you
locate
the
lit
LED
next
to
the
defective
microprocessor.
Follow
the
instructions
in
“Microprocessor
and
power
module”
on
page
121
and
“Installing
and
replacing
a
microprocessor
and
power
module”
on
page
100
to
remove
and
replace
the
microprocessor.
For
more
information
about
LEDs
and
connectors,
see
“Connector
and
LED
locations”
on
page
80.
Diagnostic
display
If
a
problem
is
detected
with
system
power
on
or
during
initialization,
the
two-hex
character
diagnostic
display
on
the
midplane
board
might
show
an
error
code.
See
“Midplane
board
connectors
and
LEDs”
on
page
84
and
“Diagnostic
display
error
codes”
on
page
181
for
more
information.
Chapter
3.
Diagnostics
37