Toshiba Tecra A2-S239 Maintenance Manual - Page 147

3.17 Sound/LAN/Modem /TV Test 3 Tests and Diagnostics Subtest 01 Microphoned recording & play This subtest checks the function of the CODEC A/D D/A converter. Both the microphone and headphone terminals can be checked at the same time. Before executing this subtest, connect an external microphone to the computer. If necessary, connect a headphone to the computer to check whether the headphone jack of the computer is working properly. When the subtest is selected, the following message appears. ....Press test number[1-3] ? pause Press any key to continue... Press any key, and the following message appear. Press test number[1-3] ? Call micrec Copyright (c) Tenberry Software, Inc. XXXX When the above message is displayed, the screen is fixed for a while. Then record the sound with the microphone. When the following message appears, make sure the recorded sound is replayed. STACWAVE Version X.XX Build data: XXX XX XXXX at XX:XX:XX Loading "mic.wav". Subtest 02 Sin Wave This subtest is executed by loading the COM file (ADSIN.COM). The program expands sin wave data table from 16KB to 64KB, and creates the play data. Then it transfers the data between the DMA and the CODEC to paly the sine wave. (It sounds like a continuous beep). By using wave measuring devices such as an oscilloscope, the data can be measured as a sine wave. When the subtest is executed, the following message appears. ....Press test number[1-4] ? pause Press any key to continue... Press any key, and the following message appears. Then sin wave is expanded from 16KB to 64KB data and is played. ....Press test number[1-4] ? call sin Satellite A50/TECRA A2 Maintenance Manual (960-478) 3-39