IBM JS20 Hardware Maintenance Manual - Page 57

Memory, errors

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DIMM 3 error LED (CR46) DIMM 1 error LED (CR40) DIMM 2 error LED (CR45) DIMM 4 error LED (CR53) Microprocessor 0 error LED (CR19) Temperature error LED (CR16) Light Path Diagnostics (SW1) Microprocessor 1 error LED (CR58) Service processor error LED (CR27) NMI error LED (CR17) System board error LED (CR20) Reserved (CR29) 4. Press and hold the light path diagnostics button (SW1) to light the LEDs that were lit before you removed the blade server from the BladeCenter unit. The LEDs will remain lit for as long as you press the button, up to a maximum of 25 seconds. Notes: a. Power is available to relight the light path diagnostics LEDs for a short period of time after the blade server is removed from the BladeCenter unit. During that time, you can relight the light path diagnostics LEDs for a maximum of 25 seconds (or less, depending on the number of LEDs that are lit and the length of time the blade server is removed from the BladeCenter unit) by pressing the light path diagnostics button (SW1). b. Error LED CR29 is reserved. 5. Use the table at "Light path diagnostics LEDs" on page 145 to help determine the cause of the error and the action that should be taken. Memory errors If a memory problem occurs, complete the following steps before replacing a DIMM: 1. Reseat both DIMMs in the bank. 2. Turn off the blade server and wait 30 seconds; then, turn on the blade server. 3. Check for a memory type mismatch in the bank. For more information about memory, see "Installing memory modules" on page 77. Chapter 7. Diagnostics 47

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DIMM 1 error
LED (CR40)
DIMM 3 error
LED (CR46)
DIMM 2 error
LED (CR45)
DIMM 4 error
LED (CR53)
Microprocessor 1
error LED (CR58)
Microprocessor 0
error LED (CR19)
Temperature
error LED (CR16)
NMI error
LED (CR17)
System board
error LED (CR20)
Service processor
error LED (CR27)
Light Path Diagnostics
(SW1)
Reserved (CR29)
4.
Press
and
hold
the
light
path
diagnostics
button
(SW1)
to
light
the
LEDs
that
were
lit
before
you
removed
the
blade
server
from
the
BladeCenter
unit.
The
LEDs
will
remain
lit
for
as
long
as
you
press
the
button,
up
to
a
maximum
of
25
seconds.
Notes:
a.
Power
is
available
to
relight
the
light
path
diagnostics
LEDs
for
a
short
period
of
time
after
the
blade
server
is
removed
from
the
BladeCenter
unit.
During
that
time,
you
can
relight
the
light
path
diagnostics
LEDs
for
a
maximum
of
25
seconds
(or
less,
depending
on
the
number
of
LEDs
that
are
lit
and
the
length
of
time
the
blade
server
is
removed
from
the
BladeCenter
unit)
by
pressing
the
light
path
diagnostics
button
(SW1).
b.
Error
LED
CR29
is
reserved.
5.
Use
the
table
at
“Light
path
diagnostics
LEDs”
on
page
145
to
help
determine
the
cause
of
the
error
and
the
action
that
should
be
taken.
Memory
errors
If
a
memory
problem
occurs,
complete
the
following
steps
before
replacing
a
DIMM:
1.
Reseat
both
DIMMs
in
the
bank.
2.
Turn
off
the
blade
server
and
wait
30
seconds;
then,
turn
on
the
blade
server.
3.
Check
for
a
memory
type
mismatch
in
the
bank.
For
more
information
about
memory,
see
“Installing
memory
modules”
on
page
77.
Chapter
7.
Diagnostics
47