Sun Microsystems Ultra 1 140 Service Manual page 36

3
3.4 Additional Keyboard Control Commands
3.5 System and Keyboard LEDs
3-4
•
Stop Key
If the diag-switch? variable is set to true but you want to bypass POST
when the system is powered on, press and hold the Stop key on the
keyboard and turn on the system power. This causes POST to be bypassed.
•
Stop and N Keys
If you want to return the system's NVRAM parameters to their original
default settings, press and hold the Stop and N keys before powering on the
system. Continue to hold the Stop and N keys until the system banner
appears on the monitor.
The power LED at the front of the chassis remains lit when the system is
operating normally. Figure 3-1 shows the location of the power LED.
Figure 3-1 Power LED
This section describes the keyboard light emitting diode (LED) patterns as a
result of POST and their meaning. While POST is running and making
progress, the Caps Lock key LED blinks while the rest of the LEDs are off. If
POST finds an error, a pattern is encoded in the LEDs to indicate the defective
part. If POST completes with no errors, all LEDs will be turned off before
returning to the OpenBoot PROM(OBP).
Figure 3-2 shows the location of the LED keys on the Sun type 5-c keyboard.
Table 3-1 lists the meaning of the LED keys.
Sun Ultra 1 Series Service Manual—November 1995
LED