7.12.1 Error Indications
The system provides error indications via LEDs and error messages. Using the two
in combination, you can isolate a problem to a particular field-replaceableunit (FRU)
with a high degree of confidence.
The system provides fault LEDs in the following places:
Front panel
Keyboard
Power supplies
Disk drives
Error messages are logged in the /var/adm/messages file and are also displayed
on the system console by the diagnostic tools.

7.12.1.1 FrontPanel LEDs

Front panel LEDs provide your first indication if there is a problem with your
system. Usually,a front panel LED is not the sole indication of a problem. Error
messages and even other LEDs can help to isolate the problem further.
The front panel has a general fault indicator that lights whenever POST or OBDiag
detects any kind of fault ( including a fault reported by a power supply).

7.12.1.2 KeyboardLEDs

Four LEDs on the Sun Type-5keyboard are used to indicate the progress and results
of POST diagnostics. These LEDs are on the Caps Lock, Compose, Scroll Lock, and
Num Lock keys as shown below.
Note - A keyboard is not shipped with the system. To read keyboard LEDs you
must obtain a keyboard of the appropriate type (seethe following graphic)and
connect it to the keyboard/mouse port on the system’s back panel.
212 Sun Enterprise 220R Server Service Manual ♦January 2000, Revision A