Ricoh 4016 Series - Manual (Page 139)

G ETTING S TARTED 1.12
Adjusting the Speaker Volume
1 Make sure that the display shows date and time (Fax
Standby mode). If not, press Mode/Enter to switch to the
Fax mode.
2 Press On Hook Dial. You’ll hear dial tone.
3 Press or repeatedly until you find the desired
loudness. The display shows the current volume level.
4 Press On Hook Dial to save the change and return to
Standby mode.