Dell Latitude LM Reference And Troubleshooting Manual page 77

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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
•
FIFO RAM Test
Checks the read/write capabilities and status of the
audio controller
•
Initial Reset Status Test
Verifies the reset values of the extended registers on
the audio controller
•
Internal Register Test
Writes test patterns to the internal registers of the
audio controller, then reads other registers to confirm
that the patterns are correctly interpreted
•
Dual Channel Test
Confirms the presence of a second DMA channel on
the system chip set and determines if the DMA con-
troller and audio controller can exchange signals on
that second DMA channel
NOTE: The Dual Channel Test is performed only on
Dell Latitude XPi systems.
•
FM Sound Playback Test
Tests whether the system can synthesize sounds and
play them through the built-in speaker(s)
•
Analog Sound Playback Test
Tests whether the system can play sampled sounds
through the built-in speaker(s)
•
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.
Running the Dell Diagnostics 4-21