[Scribus] printing with linescreen

[Scott A. Phipps]

How does one go about printing with a specific linescreen? I have used
the linescreen setting in scribus but am not doing something right,
because I cannot tell a difference when I print. I am trying to print a
xerox phaser 7750dn with a linescreen of 85. I am trying to get a high
school newspaper class set up so that they can send camera ready pages
to the local newspaper to be printed. Any guidance would be greatly
appreciated. 

Thanks

Scott