horizontal lines from printer

[rvolheim]

hi there. i have a brother HL-1440 laser printer, and i'm getting about 8 horizontal lines (about 1/16 inch thick) smearing across each printed page. three lines one inch apart, then an inch and a half to the next three lines one inch apart. i have cleaned the corona wire using the blue plastic slide cleaner, as recommended, and i have cleaned the scanner slot with a clean dry cloth as well. neither of these fixes had any impact. what do i try next? thanks, randy