IBM QS22 - BladeCenter - 0793 Service Manual page 77

Modular
flash drive
error LED
Light path
diagnosis
switch
Light path
diagnosis
LED
Temperature fault LED
Figure 27. Light box and system board LEDs
The location of each LED on the system board is shown in the table below.
Table 5. System board LEDs
LED
Status LEDs
Heartbeat
Alert
Ethernet 1 activity
Ethernet 0 activity
BE0_PLL_LOCK
BE1_PLL_LOCK
MM_SELECT_A
MM_SELECT_B
I/O buffer DIMM error LED
I/O buffer DIMM error LED
NMI error LED
CPU fail LED
System board LED
Board
Color location Explanation
Green D16
Yellow D15
Green D12
Green D11
Green D8
Green D13
Green D19
Green D18
System memory DIMM
error LEDs
Indicates the BMC is functional.
Indicates an error condition has
occurred on the system board.
Indicates on-board Ethernet 1 is
active and sending or receiving
packets.
Indicates on-board Ethernet 0 is
active and sending or receiving
packets.
Indicates the phased lock loop of
Cell BE-0 is working.
Indicates the phased lock loop of
Cell BE-1 is working.
Indicates Advanced Management
Module A is active.
Indicates Advanced Management
Module B is active.
Chapter 5. Diagnostics and troubleshooting
Comments
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.
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