“Why my Brother- HL- L2370DW has a 1/4 inch thick black line on every page that I print?”
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Have you pulled out the drum/toner cartridge combination and used the "corona wire cleaner" lever at the far end of the assembly? It is a rectangular green slider that you move a few times back and forth, and it cleans any debris clinging to the "charging" or "corona wire" inside the drum assembly. If toner clings to the wire you will find the kind of vertical line(s) you describe. If that doesn't solve the problem, it is likely that the drum has been damaged or was defective. Those are the only two explanations I can think of. Hope that helps!
Sorry, there was a problem. Please try again later.We are sorry to hear that you are experiencing print quality issues with your Brother HL-L2370DW printer and we'd like to help. We have many helpful resources on our support website which should help. Please make sure the corona wire tab of the drum unit is set to the Home position at the far left side of the drum unit. If the problem persist, feel free to contact Brother Customer Service directly.
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