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

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Bad copies and prints after changing the drum and toner cartridge

We recently replaced the drum and toner cartridge and everything that prints has lines and blotches on it. I don't know what caused this. It didn't happen immediately after replacing the drum and cartridge, several weeks later. Any help would be appreciated. Thanks Jeff

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  • a_windisch Jan 05, 2009

    i have the same problem and yes I have cleaned the wire. I feel like I wasted as much as it would have cost to get a new all in one. Is there anything that can be done without buying another drum?

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Did you clean the corona wire when you replaced them? Even with the Drum being brand new, you still need to run the little piece of blue plastic back and forth across the wire that is called the corona wire. If you don't know where that is, and do not have the complete software for your printer - you can find that at the link I have provided below. The short version is that it is just in front of the toner cartridge on the drum housing. If you do have the software, open the user manual and look for the table of contents listing that refers to replacing toner and drum cartridges. This will show you a picture of where the corona wire is.
http://welcome.solutions.brother.com/BSC/Public/Templates/DownloadTop.aspx?NRMODE=Published&NRNODEGUID=%7b2C7B4D65-D5B3-47BF-958E-322BE5EFDCA8%7d&NRORIGINALURL=%2fbsc%2fpublic%2fus%2fus%2fen%2fdlf%2fdownload_top%2ehtml%3freg%3dus%26c%3dus%26lang%3den%26prod%3dmfc7420_all&NRCACHEHINT=NoModifyGuest&prod=mfc7420_all&reg=us&c=us&lang=en

Posted on Jun 18, 2008

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Hi there. There could be up to three things causing the the lines on your print outs.

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The one way to test this is to start a print out and as it starts going open the front cover to where your toner cartridge goes in. This will stop the print in its tracks. You might need to do this a couple times to catch the paper in the right area. Pull out the toner cartridge and see if the lines are showing up there. Remove the paper, but be careful though the toner has not been fused to the paper yet and you can get it on your or your clothes. If the lines are showing up then your best bet is to replace the toner cartridge. But if they don't show up then it could be the drum or fuser. Most laser printers have a drum built into the toner cartridge, but there are some with separate drums. The Toner cartridge is the most common cause. Its very rare for a fuser to cause lines but they can go bad and cause a build up on the fuser of toner.

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