System-Board Leds - IBM JS20 - BladeCenter - 8842 Installation And User Manual

System-board LEDs

The following illustration shows the location of the LEDs on the system board. You
might need to refer to this illustration when solving problems with the blade server.
You must remove the blade server from the BladeCenter unit, open the cover, and
press the light path diagnostics button (SW1) to light any error LEDs that were
turned on during processing.
Notes:
v Power is available to light the light path diagnostics LEDs for a short period of
v Error LED CR29 is not used.
v For the locations of the corresponding DIMM sockets and microprocessor
DIMM 1 error
LED (CR40)
16
BladeCenter JS20 Type 8842: Installation and User's Guide
time after the blade server is removed from the BladeCenter unit. During that
period of time, you can light the light path diagnostics LEDs for a maximum of 25
seconds (or less, depending on the number of LEDs that are lit and the length of
time the blade server is removed from the BladeCenter unit) by pressing the light
path diagnostics button (SW1).
connectors on the system board, see the illustration in "System-board internal
and option connectors" on page 15.
DIMM 3 error DIMM 2 error
LED (CR46) LED (CR45)
DIMM 4 error
LED (CR53)
Microprocessor 0
error LED (CR19)
Temperature
error LED (CR16)
Light Path Diagnostics
(SW1)
Microprocessor 1
error LED (CR58)
Service processor
error LED (CR27)
NMI error
LED (CR17)
System board
error LED (CR20)
Reserved (CR29)