Oracle X5-8 Service Manual page 67

Troubleshoot Hardware Faults
Feedback Flash
The indicator flashes on and off during periods of activity, commensurate with the activity, but
the flashing does not exceed the 2 Hz fast blink rate (see, "Fast Blink Rate" on page 64).
For example, this blink rate occurs during disk drive read and write activity and communication
port transmit and receive activity.
Data Blink Rate
For this blink rate, a normally on Indicator repeatedly turns off twice during a one-second
interval (2 Hz—see also, "Fast Blink Rate" on page 64) while data activity is taking place.
Sequential (Diagnostic) Blink Rate
This blink rate is a repeating sequence in which each indicator successively lights for 0.5 sec
to indicate that diagnostics are running. This blink rate is used only on systems or components
capable of running diagnostics.
Troubleshooting and Diagnostics 67