Toshiba Portege R200 Maintenance Manual page 196

3 Tests and Diagnostics
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.
The test returns 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.
The test returns to the CD Sound (Standard) menu after the test ends.
3-88 [CONFIDENTIAL]
3.28 Sound Test program
PORTEGE R200 Maintenance Manual (960-519)