
technical reference guide
4–7
Troubleshooting
diagnostic LEDs
The four diagnostic LEDs on the front bezel of the system are used for diagnosing the health of
the system. These LEDs warn of impending hardware failures and allow you to take preventive
action, such as making a system backup or replacing a component before it fails. These
diagnostic LEDs are labeled 1, 2, 3 and 4.
The location of red LEDs can be used to identify the category of the fault or warning. For
example, if LED one is red, there is a problem with memory. However, if LEDs one and two are
both red, there is a problem with the system processor.
If the diagnostic LEDs indicates an error, check the SEL (page D-4) for a more detailed
explanations of the failure.
The following symbols are used in the LED tables.
■
The
System LED
indicates the severity of the error:
Blinking orange
indicates a WARNING.
Blinking red
indicates a FAULT.
■
The
Diagnostic LEDs
provide details about the specific error that has occurred:
Solid red
indicates the failing part or sub-system.
Off or solid green
diagnostic LEDs provide additional details about the
failure.