IBM BladeCenter HS21 Series Problem Determination And Service Manual page 69

The following illustration shows the locations of the error LEDs and the light path
diagnostics panel on the optional IBM BladeCenter Memory and I/O Expansion
Blade.
The following illustration shows the light path diagnostics panel on the optional
Memory and I/O Expansion Blade.
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
When you press the light path diagnostics switch, note which LEDs are lit on the
system board, optional Memory and I/O Expansion Blade, and light path diagnostics
panels. Using this information and the information in "Light path diagnostics LEDs"
on page 54 can often provide enough information to diagnose the error.
Light path diagnostics
DIMM8 error LED
DIMM7 error LED
DIMM6 error LED
DIMM5 error LED
Chapter 2. Diagnostics
53