Question about Brother MFC 7420 All-In-One Laser Printer

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Black line down the paper on copy mode. Ok in print mode.

There is a BOLD Black line down the paper on copy mode. Ok in print mode. Prints fine. Have replaced the drum and still get the black line. What's up?

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There is most likely something on your scan glass that is blocking the scanner. Clean of both pieces of glass that are there when you flip open the ADF, or top cover. Try to copy again. If it is still there then there is either something on the scanner piece that moves back and forth to scan or one of your scan LEDs is burnt out and the scanner will have to be replaced.

Posted on Dec 17, 2008

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Don't forget to 4 star this solution.

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is it a printer/copier?
yes....do both prints and copies off the glass come out black?
yes...probably a problem in the drum/ CRU area
No- prints OK but copies black lift the lid and watch the exposure lamp...does it light up? does it move? Both of these scenarios would usually bring up a fault code, so I would still be inclined towards the drum unit.Pull the unit out and make sure no paper has sneaked up between the drum and the exposure slot, or even into the drum unit. another cause could be a broken corotron wire (very thin wire close to the drum usually behind a grid (charge grid) If it is a customer replacement drum unit (CRU) the charge grid will be built into the unit and will require the whole thing replacing.......

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