Toshiba 50CT User Guide - Page 96

Sound Test, Tests and Diagnostics, WARNING

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3 Tests and Diagnostics 3.15 Sound Test 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 two subtests that test the sound functions. NOTE: To execute this subtest, the internal microphone and external headphone (or external 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 hearing. Subtest 01 FM synthesizer Load the COM file. Connect headphones or speakers, and execute the OPL3SA3 (YMF711) function test. The eight-note musical should play through both sides of the headphones or through both speakers. Subtest 02 SINE-wave playback Load the COM file. 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.) Use the oscilloscope to observe the sine-wave form. Libretto 50CT/70CT Maintenance Manual 3-31

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3 Tests and Diagnostics
3.15
Sound Test
Libretto 50CT/70CT Maintenance Manual
3-31
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 two subtests that test the sound
functions.
NOTE
:
To execute this subtest, the internal microphone and external headphone (or
external 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 hearing.
Subtest 01
FM synthesizer
Load the COM file. Connect headphones or speakers, and execute the OPL3-
SA3 (YMF711) function test. The eight-note musical should play through both
sides of the headphones or through both speakers.
Subtest 02
SINE-wave playback
Load the COM file. 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.) Use the oscilloscope to
observe the sine-wave form.