IBM eServer BladeCenter HS20 Type 8832, Maintenance And Troubleshooting Manual

Page: 34 / 158

Small computer system interface messages
This information only applies if a storage expansion unit is available. If your receive
a SCSI error message when running the SCSI Select Utility program, see “SCSI
error codes” on page 87.
Note: If the server does not have a hard disk drive, ignore any message that
indicates that the BIOS is not installed.
Light path diagnostics
If the system-error LED on the system LED panel on the front or rear of the
BladeCenter unit is lit, one or more error LEDs on the BladeCenter unit components
also might be on. These LEDs help identify the cause of the problem.
This section provides the information to identify, using the light path diagnostics,
problems that might arise. To locate the actual component that caused the error,
you must locate the lit error LED on that component.
For example:
A blade server error has occurred and you have noted that the blade server
blade-error LED is lit on the blade server control panel. You then:
1. Remove the blade server from the BladeCenter unit.
2. Place the blade server on a flat, static-protective surface.
3. Remove the cover from the blade server.
4. Press and hold the light path diagnostics button to relight the LEDs that were lit
before you removed the blade server from the BladeCenter unit. The LEDs will
remain lit for as long as you press the button, to a maximum of 25 seconds.
DIMM 1 error
LED (CR3)
DIMM 2 error
LED (CR5)
DIMM 3 error
LED (CR4)
DIMM 4 error
LED (CR6)
Processor 1
error LED (CR12)
Processor 2
error LED (CR13)
Light path
diagnostics button
(SW4)
Temperature
error LED
(CR31)
NMI error
LED (CR17)
System board
error LED
(CR30)
IDE bus 1 error
LED (CR14)
IDE bus 2 error
LED (CR28)
Processor mismatch
error LED (CR110) Light path diagnostics
power present
LED (CR111)
Reserved (SW3)
Figure 5. System board: light path diagnostics
24
BladeCenter HS20 Type 8832: Hardware Maintenance Manual and Troubleshooting Guide