Audio Test Group; Why Run An Audio Test; Subtests; Other Test Group - Dell Latitude CP Reference And Troubleshooting Manual

A
udio Test Group
The subtests in the Audio test group check the functions
of the audio controller and the computer's recording and
playback features.

Why Run an Audio Test

If you do not hear sounds from your built-in speakers
when you expect to, it is possible that your operating sys-
tem or sound application uses resource settings different
from those of the audio controller in the computer. In the
absence of an expected sound, first check the documenta-
tion that accompanied your operating system or sound
application to see if the sound features are correctly con-
figured to work with the computer. The default resource
settings for the audio controller are:
•
DMA channel: 1
•
IRQ line: 5
•
Port address: 220h
If necessary, change the resource settings in your operat-
ing system or sound application to match these default
settings.
If you still do not hear sound when you expect to, run the

Audio test group.

NOTE: Before running the Audio test group, enable the
built-in speaker(s) to make sure that the speaker volume
has not been muted.

Subtests

The six subtests in the Audio test group confirm the fol-
lowing functions:
•
Software Reset Test
Checks for the presence of an active audio controller
in your system
•
Interrupt Test
Checks whether the audio controller is generating an
interrupt on the IRQ line configured for that
controller
4-22 Dell Latitude CP Reference and Troubleshooting Guide
•
DMA Test
Tests for the presence of a DMA channel on the sys-
tem chip set, and determines if the DMA controller
and the audio controller can exchange signals
•
FM Sound Playback Test
Tests whether the system can synthesize sounds and
play them through the built-in speakers
•
Analog Sound Playback Test
Tests whether the system can play sampled sounds
through the built-in speakers
•
Record and Playback Test
Checks the ability of the audio controller to generate
a sampled sound from signals received from the
built-in microphone
The last three Audio subtests are interactive. In both the
FM Sound Playback Test and the Analog Sound Play-
back test, a series of musical tones is played through the
computer's built-in speaker(s). A message on the display
asks if you hear the tones. Type y if you hear the tones;
otherwise, type n.
The third interactive test, the Record and Playback Test,
checks the computer's built-in microphone and speaker(s).
When prompted, press any key on the built-in keyboard
and say your name in a normal tone of voice.
NOTE: After you press the key, you have only a few sec-
onds to speak your name.
When prompted again, hit any key on the built-in key-
board to play back your voice through the built-in
speaker(s). Type y if you hear your voice; otherwise, type
n. If you press n, you are given another opportunity to
run the Record and Playback Test. When prompted, type
y if you want to try the test again (for instance, if you did
not speak quickly enough after pressing a key to begin
the test). Otherwise, press n.
O
ther Test Group
The Fan Control Test in the Other test group checks the
function of the fan. The fan works with the air intake on
the computer as part of the automatic thermal manage-
ment system.