Toshiba portege 610ct 620ct Service Manual
610CT
3-33
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 three subtests that test the
610CT series Sound functions.
and follow the directions on the screen. The Sound test contains three subtests that test the
610CT series Sound functions.
Subtest 01
CODEC (REC/PLAY)
NOTE: To execute this subtest, the internal microphone and internal
headphone (or internal speaker) are required.
headphone (or internal speaker) are required.
Tests the functions of the Codec (ES688) A/D, D/A converter. At the same
time, tests the microphone and headphone terminals. When you execute this
subtest, the following message is displayed:
time, 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 ***
Press any key to *** REC ***
After pressing any key, start the recording and immediately play the sound. (It
takes three seconds.)
takes three seconds.)
Subtest 02
FM synthesizer
Tests the OPL# (YMF262) functions. Connect the headphone and check the
scale for the right and left sides. Also check the sound adjustment volume.
scale for 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, using the oscilloscope, observe the sine
waveform.
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.