Brother WL660 - Manual (Page 48)

USER’S GUIDE
5–10
English
ADJUSTING THE PRINT DENSITY
The print density dial is located near the power cord on the back of the
printer. You can use it to adjust the amount of toner applied to the paper.
When the toner cartridge and drum unit are replaced or if the operating
temperature and humidity are high or low, print conditions may change
causing darker or lighter printouts.
Use a screwdriver to turn the print density dial clockwise for darker
printouts and counterclockwise for lighter printouts. The dial has been set
to the middle position.
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Fig. 5-15 Adjusting the Print Density Dial