Subtest 01; Sound Test - Toshiba Tecra 700CS Maintenance Manual

3.15 Sound Test

To execute the Sound Test, select 12 from the DIAGNOSTIC 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.
WARNING: 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)
This subtest tests the functions of the Codec (ES688) 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 ES488/688]
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 sides. Also check the sound adjust-
ment volume.
Subtest 03 SINE 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.
700 Series
3-33