Sun Microsystems Sun Fire V440 Parts Installation And Removal Manual page 15

Front Panel LEDs
Several front panel LEDs provide general system status, alert you to system
problems, and help you to determine the location of system faults.
During system startup, the LEDs are toggled on and off to verify that each one is
working correctly. LEDs located on the front panel work in conjunction with specific
fault LEDs. For example, a fault in the power supply subsystem illuminates the
power supply Service Required LED on the affected power supply, as well as the
system Service Required LED. Since all front panel status LEDs are powered by the
system's standby power source, fault LEDs remain lit for any fault condition that
results in a system shutdown.
System Status LEDs
At the top left of the system as you look at its front are three system status LEDs.
The System Activity LED and the system Service Required LED provide a snapshot
of the overall system status. The Locator LED helps you to quickly locate a specific
system even though it may be one of numerous systems in a room. The Locator LED
is at the far left in the cluster, and is lit by command from the administrator.
Service Required LED
Locator LED
System Activity LED
Each system status LED has a corresponding LED on the back panel.
Chapter 1 Identifying Front Panel and Back Panel Features 3