“Why do I get a black line (about 1/4 inch thick on the left side of the page on my copies? I am using a DCO-7040 Printer/ copier.”
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We are sorry to hear that you are experiencing print quality issues with your Brother DCP-7040 printer. Please make sure the corona wire tab of the drum unit is in the Home position (▲). We have many helpful resources in our support website which may help. If the issue persists, feel free to contact Brother Customer Service directly.
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