Telex Audiocom US-2002 User Instructions page 28

Operation
If you are using a speaker and microphone, or open-ear style headphones, adjust sidetone as follows:
Simultaneously press the ALL Talk and PA keys to activate the test tone.
1.
Tap the channel 1 Call key to send the test tone on channel 1.
2.
Increase the volume until you can hear the test tone. (If you are using a headset, adjust the volume control at
3.
the US2002. If you are using a speaker, adjust the volume control at the speaker.)
Using a small flat-bladed screwdriver, adjust the channel 1 sidetone through the access hole in the bottom
4.
of the US2002 (Figure 16) to minimize the tone volume.
Tap the channel 1 Call key to turn OFF the test tone on channel 1 when finished.
5.
Tap the channel 2 Call key, and repeat the adjustment for the channel 2 sidetone.
6.
Tap any other key, except a Call key, to turn OFF the test tone when finished.
7.
If you are using headphones that completely enclose the ears, adjust sidetone as follows:
Tap the Headset key to turn the headset microphone ON.
1.
Tap the channel 1 Talk key to turn it ON.
2.
While speaking into the microphone, use a small flat-bladed screwdriver to adjust the channel 1 sidetone
3.
so that you hear your voice at an acceptable level in the headphones.
Tap the channel 1 Talk key to turn it OFF when finished.
4.
Tap the channel 2 Talk key to turn it ON, and adjust the channel 2 sidetone as for channel 1.
5.
Tap the channel 2 Talk key to turn it OFF when finished.
6.
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US2002 Bottom View
FIGURE 16.