IBM 7870B4U Service Manual page 198

The following illustration shows the locations of the system-board error LEDs.
DIMM 7-
error LED
DIMM 8-
error LED
DIMM 9-
error LED
DIMM 10-
error LED
DIMM 11-
error LED
DIMM 12-
error LED
The following illustrations show the system-board light path diagnostics panel and
LEDs on the system-board light path diagnostics panel.
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BladeCenter HS22 Type 7870, 1936, and 1911: Problem Determination and Service Guide
SAS 0-
error LED
System board error LED
SYS BRD
NMI error LED
NMI
TEMP Over Temperature LED
MIS
Microprocessor
LP 1
mismatch LED
Light Path
diagnostic LED
Light Path
diagnostic switch
Microprocessor 2- Battery-
error LED error LED
SAS 1-
Microprocessor 1-
error LED
error LED
Switch block
Light path
diagnostics
DIMM 6-
error LED
DIMM 5-
error LED
DIMM 4-
error LED
DIMM 3-
error LED
DIMM 2-
error LED
DIMM 1-
error LED