Sun Microsystems SPARCstation 2 Service Manual page 112

4
% cat /usr/demo/sound/sample.au > /dev/audioThe system plays back a spoken message
% cat /vmunix > /dev/audioThe system plays back garbage, which is louder
Press Control-C to abort the message
96
6. Measure the voltage on the LED pin of the speaker connector by using a
VOM
If the voltage measured is 0 V, the LED will not light. Replace the main
logic board. See "Removing the Main Logic Board" and "Replacing the
Main Logic Board" earlier in this chapter. If at least +5 V is measured on the
LED pin of the connector and the LED does not light, the LED is bad.
Replace the LED/speaker assembly as directed in the following procedures.
7. Test if sound is heard when sound is being sent to the speaker. Replace
the system unit's cover.
To do this see "Replacing the System Unit's Cover" later in this chapter.
8. Bring up the system and boot the SunOS Operating System.
To do this, see "Booting Your System" in Chapter 1 of the Sun System &
Network Manager's Guide.
9. Generate sound through the speaker by entering either of the following:
or
10. Replace the speaker assembly as directed in the following procedures, if
either of the sound tests fail.
If either of the sound tests pass, do not replace the speaker. Replace the
LED/speaker assembly or the main logic board only if the LED does not
light (see step 3).
SPARCstation 2 Field Service Manual—February 1991