Sharp FO-IS115N Operation Manual page 34

Volume Adjustment
Ringer
1
Press
(Make sure
document is not loaded in the feeder.)
•
The ringer will ring once at the selected level.
2
If you selected "OFF OK ?" to turn off the ringer, press
30
or to select HIGH, MIDDLE, LOW or OFF.
SPEAKER
has not been pressed, the handset is not lifted, and a
START
.