Sound Test - Toshiba 710CDT Maintenance Manual

3.15 Sound Test

To execute the Sound Test, select 12 from the DIAGNOSTICS TEST menu, press Enter and
follow the directions as they are displayed 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.
WARNING: The system is capable of producing high volume sound, so when
using 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)
This subtest tests the functions of the Codec (AD1848) A/D, D/A converter. At
the same time, it tests the microphone and headphone terminals. When you
execute this subtest, the following message is displayed:
[Quick REC & PLAY for AD1848]
Press any key to *** REC ***
After pressing a key, start recording, then immediately play the sound (it takes
three seconds.)
Subtest 02 FM Synthesizer
This subtest tests the OPL# (YMF262) functions. Connect the headphone, then
check the scale on the right and left side. Also, be sure to 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 wave-
form.
Subtest 04 Codec line in/out (record sound/replay)
Load the file AD1848L.COM. Connect a sound source such as a CD player or
stereo to the line-in port. Connect an output device such as an amplifier for the
internal speaker or a radio/cassette player to the line-out port.
710CDT/720CDT
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