Light Path Diagnostics Leds - IBM BladeCenter JS21 Types 8844 Service Manual

Light path diagnostics LEDs

The following table describes the LEDs on the system board, 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 7988 and 8844," on page 137 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.
Hard disk drive x A hard disk drive error occurred.
error
The following illustration shows the locations of the system board error LEDs.
DIMM 1 error LED (CR40)
DIMM 2 error LED (CR45)
DIMM 3 error LED (CR46)
DIMM 4 error LED (CR53)
I/O expansion option
error LED (CR34)
System-management processor error LED (CR27)
NMI error LED (CR17)
Temperature error LED (CR16)
System board error LED (CR20)
Microprocessor 1 error LED (CR19)
Hard disk drive 1 error LED (CR3)
Hard disk drive 0 error LED (CR4)
Action
An error has occurred that is not represented
by a light path diagnostics LED. Check the
management module event log for information
about the error.
1. Make sure that the DIMM indicated by the
lit LED is supported.
2. Reseat the DIMM indicated by the lit LED.
3. Replace the DIMM 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 goes away.
Refer to the Hardware Maintenance Manual
and Troubleshooting Guide or Problem
Determination and Service Guide for your
BladeCenter unit for further isolation.
1. Reseat the hard disk drive indicated by the
lit LED.
2. Replace the hard disk drive indicated by
the lit LED.
Microprocessor 0 error LED (CR58)
Light path diagnostics
switch (SW1)
125
Chapter 2. Diagnostics