Light Path Diagnostics Leds - IBM BladeCenter HS21 Series Problem Determination And Service Manual

Light path diagnostics LEDs

The following table describes the LEDs on the light path diagnostics panels, on the
system board, and on the optional Memory and I/O Expansion Blade, and
suggested actions to correct the detected problems.
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, Types 1885 and 8853," on page 73 to determine which components are CRUs
and which components are FRUs.
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Lit light path
diagnostics LED Description
None An error has occurred and cannot be isolated,
or the service processor has failed.
DIMM x error A memory error occurred.
LP1 v LP1 LED on system board: system board
assembly light path LEDs have power.
v LP1 LED on Memory and I/O Expansion
Blade: check light path LEDs on the system
board.
LP2 Light path LEDs on the Memory and I/O
Expansion Blade have power.
(optional Memory
and I/O Expansion
Blade only)
Microprocessor x The microprocessor has failed, overheated or
error the start microprocessor is missing.
54
BladeCenter HS21 Types 1885 and 8853: Problem Determination and Service Guide
Action
1. Make sure that the light path diagnostics
LED is lit to ensure that there is enough
power in the blade server to light the rest
of the LEDs.
2. Check the BMC log for information about
an error that is not represented by a light
path diagnostics LED.
1. Make sure that the DIMM indicated by the
lit LED is supported.
2. Reseat the DIMM that is indicated by the lit
LED.
3. Replace the DIMM that is indicated by the
lit LED.
Note: Multiple DIMM LEDs do not necessarily
indicate multiple DIMM failures. If more than
one DIMM LED is lit, reseat or replace one
DIMM at a time until the error is corrected.
Check for error LEDs that are lit on the system
board assembly.
Check for error LEDs that are lit on the
Memory and I/O Expansion Blade.
1. Check the advanced management module
(AMM) log for more information. Perform
appropriate action.
2. If the log shows that a microprocessor is
disabled or that a microprocessor IERR
has occurred perform the following actions.
3. (Trained service technician only) Reseat
the microprocessor that is indicated by the
lit LED.
4. (Trained service technician only) Replace
the microprocessor that is indicated by the
lit LED.