Toshiba PORTEGE M300 Maintenance Manual page 204

3.31 Sound Test program
Subtest02 English Narration
Selected this subtest, narration in English starts.
For more details on the procedure, refer to the subtest01.
Subtest03 Test Tone A
Caution: Before starting subtest03, be sure to set the sound at proper volume.
This subtest plays sine wave while changing its table from 100Hz to 20Hz.
Return to the CD Sound (Standard) menu after the test ends.
Subtest 04 Test Tone B
This subtest plays sine wave while changing its table from 400Hz to 3KHz
and also changing the channel from left speaker to right speaker.
Return to the CD Sound (Standard) menu after the test ends.
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3 Tests and Diagnostics
PORTEGE M300 Maintenance Manual (960-504)