Sennheiser UI 770 Manual page 8

UI_770.book Seite 8 Mittwoch, 24. Oktober 2012 1:50 13
Putting the UI 770 into operation
Adjusting a clear dial tone
First make sure that the handset and the headset are con-
nected correctly. The handset must be activated, i.e. the
headset/handset button
position. Check if you can hear a dial tone in the handset.
Press the headset/handset button
Check if you can hear a dial tone in the headset.
Otherwise, set the ABC switch to the positions "A", "B" and "C"
one after the other. In each position, check if you can hear
a dial tone.
Adjusting the volume of the headset microphone
The microphone volume control on the UI 770 allows you to adjust
the volume of the headset microphone: a soft voice is slightly
amplified and a loud voice is attenuated.
Adjust the telephone to a medium volume level.
Turn the microphone volume control to position "1".
Make a call and speak into the microphone with a normal voice.
Slowly turn the microphone volume control until the other
party can hear you.
Limiting the speaker volume
The EU switch on the UI 770 allows you to limit the speaker volume
of the headset to comply with EU Directive 2003/10/EC.
To limit the speaker volume, move the EU switch from position
"square" to "triangle".
8 | UI 770
(see page 10) must be in "down"
to activate the headset.