IBM BladeCenter HS20 Problem Determination And Service Manual page 55

The following illustration shows the locations of the system board error LEDs.
Light path diagnostics (SW4)
DIMM 3 Error LED
(CR5)
DIMM 4 Error LED
(CR6)
I/O expansion
connectors
SAS 1 hard
disk drive LED
(CR262)
The following illustration shows LEDs on the light path diagnostics panel on the
system board.
NMI
NMI error LED
MIS
Microprocessor mismatch error LED
SBRD
System-board error LED
TEMP
Over temperature error LED
Light path diagnostics LED
Light path diagnostics switch
When you press the light path diagnostics switch, note which LEDs are lit on the
system board and the light path diagnostics panel. Using this information and the
information in "Light path diagnostics LEDs" on page 40 can often provide enough
information to diagnose the error.
DIMM 1 error LED (CR201)
DIMM 2 error LED (CR4)
3V lithium battery
SAS 0 Hard disk drive LED (CR260)
SAS trays/connectors
Microprocessor 1 error LED (CR12)
Reserved
Control panel
connector
Microprocessor 2 error LED (CR13)
Chapter 2. Diagnostics
39