IBM 8862 User Manual - Page 68

Diagnosing, problems, using, light, diagnostics

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you can isolate a problem with the microprocessors. After ac power has been removed from the server, power remains available to these LEDs for up to 24 hours. After 24 hours, you might need to reinstall the microprocessor tray and turn on the server to supply power to the LEDs. Complete the following steps to view the DIMM LEDs: 1. Turn off the server and all peripheral devices. 2. Slide the server out of the rack cabinet. 3. Open the top cover. 4. If necessary, open the DIMM access doors on the memory cassette to view the DIMM LEDs. 5. Close the server cover; then, slide the server into the rack cabinet and connect all external cables. See "Connecting the cables" on page 27. Complete the following steps to view the microprocessor and VRM LEDs: 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 fans and memory cassette. 4. Lift the microprocessor-tray release latch and remove the microprocessor tray (see "Installing a microprocessor" on page 17 for instructions about how to remove the microprocessor tray). 5. Press and hold the light-path-diagnostics button on the microprocessor board for up to 30 seconds to light the error LEDs on the microprocessor board. The LEDs that were lit while the system was running will be lit while the button is pressed. Note: If the light-path-test LED on the microprocessor tray is not lit when the button is pressed, the light-path capacitor has insufficient charge to light the error LEDs. 6. Reinstall the microprocessor tray, memory cassette, and fans. 7. Close the microprocessor-tray release latch. 8. Close the server cover; then, slide the server into the rack cabinet and connect all external cables. See "Connecting the cables" on page 27. Diagnosing problems using the light path diagnostics LEDs in three locations on the server are available to help you diagnose problems that might occur during installation. Use them in the following order: 1. Operator information panel - Look at this panel first. If an error has occurred, the information LED or the system-error LED is lit. 2. Light path diagnostics panel - Move the latch on the right front of the operator information panel and pivot the panel to access the light path diagnostics panel. Note any LEDs that are lit, and then close the panel. For LED locations, see the illustration on page 34. 3. LEDs on the rear of the server, in the memory cassette, or in the microprocessor tray - To identify the component that is causing the error, note the lit LED on the rear of the server or beside the component. The following example illustrates how to use the light path diagnostics to diagnose a system error: 1. The system-error LED on the operator information panel is lit. 56 xSeries 365 Type 8861 and 8862: Installation Guide

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you
can
isolate
a
problem
with
the
microprocessors.
After
ac
power
has
been
removed
from
the
server,
power
remains
available
to
these
LEDs
for
up
to
24
hours.
After
24
hours,
you
might
need
to
reinstall
the
microprocessor
tray
and
turn
on
the
server
to
supply
power
to
the
LEDs.
Complete
the
following
steps
to
view
the
DIMM
LEDs:
1.
Turn
off
the
server
and
all
peripheral
devices.
2.
Slide
the
server
out
of
the
rack
cabinet.
3.
Open
the
top
cover.
4.
If
necessary,
open
the
DIMM
access
doors
on
the
memory
cassette
to
view
the
DIMM
LEDs.
5.
Close
the
server
cover;
then,
slide
the
server
into
the
rack
cabinet
and
connect
all
external
cables.
See
“Connecting
the
cables”
on
page
27.
Complete
the
following
steps
to
view
the
microprocessor
and
VRM
LEDs:
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
fans
and
memory
cassette.
4.
Lift
the
microprocessor-tray
release
latch
and
remove
the
microprocessor
tray
(see
“Installing
a
microprocessor”
on
page
17
for
instructions
about
how
to
remove
the
microprocessor
tray).
5.
Press
and
hold
the
light-path-diagnostics
button
on
the
microprocessor
board
for
up
to
30
seconds
to
light
the
error
LEDs
on
the
microprocessor
board.
The
LEDs
that
were
lit
while
the
system
was
running
will
be
lit
while
the
button
is
pressed.
Note:
If
the
light-path-test
LED
on
the
microprocessor
tray
is
not
lit
when
the
button
is
pressed,
the
light-path
capacitor
has
insufficient
charge
to
light
the
error
LEDs.
6.
Reinstall
the
microprocessor
tray,
memory
cassette,
and
fans.
7.
Close
the
microprocessor-tray
release
latch.
8.
Close
the
server
cover;
then,
slide
the
server
into
the
rack
cabinet
and
connect
all
external
cables.
See
“Connecting
the
cables”
on
page
27.
Diagnosing
problems
using
the
light
path
diagnostics
LEDs
in
three
locations
on
the
server
are
available
to
help
you
diagnose
problems
that
might
occur
during
installation.
Use
them
in
the
following
order:
1.
Operator
information
panel
-
Look
at
this
panel
first.
If
an
error
has
occurred,
the
information
LED
or
the
system-error
LED
is
lit.
2.
Light
path
diagnostics
panel
-
Move
the
latch
on
the
right
front
of
the
operator
information
panel
and
pivot
the
panel
to
access
the
light
path
diagnostics
panel.
Note
any
LEDs
that
are
lit,
and
then
close
the
panel.
For
LED
locations,
see
the
illustration
on
page
34.
3.
LEDs
on
the
rear
of
the
server,
in
the
memory
cassette,
or
in
the
microprocessor
tray
-
To
identify
the
component
that
is
causing
the
error,
note
the
lit
LED
on
the
rear
of
the
server
or
beside
the
component.
The
following
example
illustrates
how
to
use
the
light
path
diagnostics
to
diagnose
a
system
error:
1.
The
system-error
LED
on
the
operator
information
panel
is
lit.
56
xSeries
365
Type
8861
and
8862:
Installation
Guide