Toshiba T2150 series Maintenance Manual page 83

Subtest 06 Codec line in/out (record sound/replay)
Load the ESS688L.COM file. Connect a sound source such as a CD player or
stereo to the line-in port. Next, connect an output device such as an amplifier
for the internal speaker, or a radio/cassette player to the line-out port.
After making the connections, a dialogue box will be displayed. Press Enter
to play a recorded sound. About three seconds after the recorded sound is
played, the dialogue box will be displayed again.
NOTE: A port replicator must be connected to conduct the line-out test.
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T2150 Series