Brother MFC 9840CDW - Manual (Page 41)

Printing
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Enhance Black Printing
If a black graphic cannot print correctly, choose this setting.
Halftone Screen Lock
Stops other applications from modifying the Halftone settings. The default setting is on.
High Quality Image Printing
You can get the high quality image printing. If you set High Quality Image Printing to On, the printing
speed will be slower.
BR-Script Level
You can change the BR-script emulation language level. Choose the level from the drop-down list.