Brother HL-L8350CDWT - Manual (Page 117)

General Information
110
3
Quiet mode feature
3
The Quiet mode setting can reduce printing noise. When Quiet Mode is turned on, the print speed becomes
slower. The default setting is Off.
Turning Quiet mode on/off
3
a
Press a or b ( + or -) to choose General Setup. Press OK.
b Press a or b ( + or -) to choose Ecology. Press OK.
c Press a or b ( + or -) to choose Quiet Mode. Press OK.
d Press a or b ( + or -) to choose On or Off. Press OK or Go.
NOTE
If your machine has been set to Toner Save On, you cannot set Quiet mode to On.