Question about Brother DCP-7020 All-In-One Laser Printer

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The unit prints a heavy black coating on paper

The unit prints a heavy, rough looking, irregular, black coating on paper with different toner cartridges. What is the most likely cause of this?

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This is caused by corona arcing in the drum unit. When you install the toner cartridge into the drum unit there is a blueish colored plastic tab on top of the drum unit that you can slide back and forth to clean part of the corona. Slode this back and forth at least 5 to 10 times. I would try this first and see if the problem goes away. I have seen this many times and about 50% of the time the plastic slide will resolve the issue. If not you can either go ahead and replace your drum unit with a new one or the charge corona assembly will have to be removed and cleaned.
Good Luck and Thank You for using Fixya.

Posted on May 27, 2010

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