IBM QS21 Service Guide - Page 73

Color, Board, location, Explanation, Comments, Status, Light

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Table 4. System board LEDs LED Status LEDs Heartbeat Alert Color Green Yellow Ethernet 1 activity Green Ethernet 0 activity Green BE0_PLL_LOCK Green BE1_PLL_LOCK Green MM_SELECT_A Green MM_SELECT_B Green Light path LEDs DIMM at JDIM11 error DIMM at JDIM10 error DIMM at JDIM01 error DIMM at JDIM00 error Yellow Yellow Yellow Yellow Light box LEDs Board location Explanation Comments The status LEDs are listed for D16 Indicates the BMC is functional. reasons of completeness since they are for use by IBM service D15 Indicates an error condition has only and are not normally visible. occurred on the system board. They are not activated by the light D12 Indicates Ethernet 1 is active and path diagnostics switch. sending or receiving packets. D11 Indicates Ethernet 0 is active and sending or receiving packets. D8 Indicates the phased lock loop of Cell/B.E.-0 is working. D13 Indicates the phased lock loop of Cell/B.E.-1 is working. D19 Indicates Advanced Management Module A is active. D18 Indicates Advanced Management Module B is active. D21 There has been a failure in the Either remove or replace the I/O DIMM module. DIMM and reboot. D20 See Figure 26 on page 54 for the location of each DIMM and its D10 associated LED. D7 Chapter 5. Diagnostics and troubleshooting 55

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Table
4.
System
board
LEDs
LED
Color
Board
location
Explanation
Comments
Status
LEDs
The
status
LEDs
are
listed
for
reasons
of
completeness
since
they
are
for
use
by
IBM
service
only
and
are
not
normally
visible.
They
are
not
activated
by
the
light
path
diagnostics
switch.
Heartbeat
Green
D16
Indicates
the
BMC
is
functional.
Alert
Yellow
D15
Indicates
an
error
condition
has
occurred
on
the
system
board.
Ethernet
1
activity
Green
D12
Indicates
Ethernet
1
is
active
and
sending
or
receiving
packets.
Ethernet
0
activity
Green
D11
Indicates
Ethernet
0
is
active
and
sending
or
receiving
packets.
BE0_PLL_LOCK
Green
D8
Indicates
the
phased
lock
loop
of
Cell/B.E.-0
is
working.
BE1_PLL_LOCK
Green
D13
Indicates
the
phased
lock
loop
of
Cell/B.E.-1
is
working.
MM_SELECT_A
Green
D19
Indicates
Advanced
Management
Module
A
is
active.
MM_SELECT_B
Green
D18
Indicates
Advanced
Management
Module
B
is
active.
Light
path
LEDs
DIMM
at
JDIM11
error
Yellow
D21
There
has
been
a
failure
in
the
I/O
DIMM
module.
See
Figure
26
on
page
54
for
the
location
of
each
DIMM
and
its
associated
LED.
Either
remove
or
replace
the
DIMM
and
reboot.
DIMM
at
JDIM10
error
Yellow
D20
DIMM
at
JDIM01
error
Yellow
D10
DIMM
at
JDIM00
error
Yellow
D7
Light
box
LEDs
Chapter
5.
Diagnostics
and
troubleshooting
55