Sound Test - Toshiba 420CDT User Manual

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 six 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 and,
at the same time, tests the microphone terminals 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, and immediately play the sound. (It takes
three seconds.)
Subtest 02 FM Synthesizer
This subtest tests the OPL# (YMF262) functions. Connect the headphone and
check the scale of the right and left sides. Also, check the sound adjustment
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, use the oscilloscope to observe the sine
waveform.
Subtest 04 Joystick
To execute this subtest, the Enhanced Port Replicator and a joystick are
required. For minimum sampling data, turn the stick to the upper left and press
the A or B button. For maximum sampling data, turn the stick to lower right
and press the A or B button (it must be a different button than the one used for
minimum sampling data). If two sampling data are the same, an error occurs.
Subtest 05 Joystick/MIDI wraparound
Conduct a wraparound test on the joystick/MIDI port.
3-32 420 Series