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Black smudges on Brother MFC-L3770CDW : r/printers
Black or colored vertical lines or streaks on printed documents - Brother Canada
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Black Lines down the page – 4 causes & how to fix them - Toner Giant
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When I print documents that contain tables or images with lines, such as technical drawings, the lines are not straight or aligned. | Brother
Brother laser printer leaving black smudges all over pages. Any idea how to fix? I tried cleaning everything inside but still prints the same : r/ printers
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