IBM QS21 - BladeCenter - 0792 Service Manual page 73

Table 4. System board LEDs
LED Color
Status LEDs
Heartbeat Green
Alert 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 Yellow
error
DIMM at JDIM10 Yellow
error
DIMM at JDIM01 Yellow
error
DIMM at JDIM00 Yellow
error
Light box LEDs
Board
location Explanation
D16 Indicates the BMC is functional.
D15 Indicates an error condition has
occurred on the system board.
D12 Indicates Ethernet 1 is active and
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
I/O DIMM module.
D20
See Figure 26 on page 54 for the
location of each DIMM and its
associated LED.
D10
D7
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.
Either remove or replace the
DIMM and reboot.
Chapter 5. Diagnostics and troubleshooting
55