Status Lights (Leds) And Indicators; Figure 3-5 Location Of System Power Led - Sun Microsystems SPARCstation 4 Service Manual

3.7

Status Lights (LEDs) and Indicators

The LED at the front of the chassis lights when the system is operating normally.
shows the location of the system LED. Chapter 4 shows flow diagrams of
FIGURE 3-5
actions to take when the system LED is not lit.
System Front
System power LED
Location of System Power LED
FIGURE 3-5
Section 3.1 "Power-On Self-Test (POST), describes the keyboard LED sequences
displayed at power up when the POST fails. If a failure occurs during the POST, the
keyboard displays a specific LED pattern. See through and
FIGURE 3-1 FIGURE 3-3
. During normal system operation, the LEDs should not be interpreted as
TABLE 3-1
diagnostic error indicators.
Following the system initialization, the operating system boots automatically, unless
the NVRAM configuration options specify not to do so.
Note – The Caps Lock key LED on some U.S. keyboards, located just above the left-
hand Shift key, is not used as a POST failure indicator, but blinks on and off while
POST is running.
If the Caps Lock key fails to flash on and off after you have pressed and held the
Stop-d keys when you power on the system, the POST failed. See Section 4.2.2
"System Board Test," for troubleshooting information.
Chapter 3 Power-On Self-Test (POST) 3-9