IBM BladeCenter HS21 Series Problem Determination And Service Manual page 26

The following illustration shows the light path diagnostics panel on the system
board.
The following illustration shows the LEDs on the optional IBM BladeCenter Memory
and I/O Expansion Blade. You must remove the blade server from the BladeCenter
unit, open the cover, and press the light path diagnostics switch to light any error
LEDs that were turned on during processing.
The following illustration shows the light path diagnostics panel on the optional
Memory and I/O Expansion Blade.
10
BladeCenter HS21 Types 1885 and 8853: Problem Determination and Service Guide
NMI
NMI error LED
MIS
Microprocessor mismatch error LED
SBRD
System-board error LED
TEMP
Over temperature error LED
LP 1
Light path diagnostics LED
Light path diagnostics switch
Memory and I/O expansion
blade system-board error LED
SBRD
System-board light path LED
LP 1
LP 2
Memory and I/O expansion
blade light path LED
Light path diagnostics switch
Light path diagnostics
DIMM8 error LED
DIMM7 error LED
DIMM6 error LED
DIMM5 error LED