Sound Test - Toshiba Libretto 100CT User Manual

File No. 960-140
3.15

Sound Test

To execute the sound test, select 12 from the DIAGNOSTICS TEST MENU, press Enter
and follow the directions on the screen. The sound test contains four subtests that test the
computer's sound functions.
NOTE: To execute this subtest, the internal microphone and internal headphone (or
internal speaker) are required. The system is capable of producing high volume sound, so
when you use the headphones be careful to set the volume low and adjust it as necessary.
Using the headphones at full volume could damage your ears.
Subtest 01 CODEC (REC/PLAY)
Test the functions of the Codec (AD1848) A/D, D/A converter. Test the
microphone terminals and headphone terminals at the same time. When you
execute this subtest the following message displays.
[Quick REC & PLAY for AD1848]
Press any key to *** REC ***
After pressing any key, start recording and immediately play the sound. (It
takes three seconds.)
Subtest 02 FM Synthesizer
Test the OPL3 (YMF262) functions. Connect the headphone and check the
scale on the right and left sides. Also check the sound adjustment volume.
Subtest 03 SIN Wave Playback
This subtest expands the sine wave data table to 64KB and creates sine wave
data. The play data is transferred between DMA and CODEC, and plays the
sound. (It is a long beep.) Also, using the oscilloscope, observe the sine
waveform.
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