Sun Microsystems SPARCstation 20, Service Manual

Page: 48 / 266

24 SPARCstation 20 Service Manual • July 1996
FIGURE 3-1
System LED Location
When POST fails at power-on, LED indicators on specific keyboard keys display a
particular LED pattern. See
FIGURE 3-2
and
TABLE 3-1
. Specific keyboard keys include:
■
Scroll Lock
■
Num Lock
■
Compose
Note –
During normal system operation, the keyboard key LEDs should not be
interpreted as diagnostic error indicators.
Note – The Caps Lock key LED is not used as a power-on test failure indicator, but
flashes on and off while POST is initialized.
LED
System unit front