Question about Brother MFC 7840W Printer
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Posted on Jan 02, 2017
Lift the lid and to the left of the main glass is a smaller glass; that is what scans during the feeding process. Make sure that it is completely clean; even a speck of dust can cause a line to appear. I took a lens wipe and cleaned mine and my line was gone.
Posted on Jun 01, 2009
Vertical lines mean it is being caused by one of the rollers within the printer. This is usually either the toner cartridge or the fuser assembly. I would try changing out the toner cartridge first even if it is new as sometimes they are DOA and they are much cheaper than the fuser assemblies. If that doesn't work, probably the fuser assembly.
Posted on Jun 05, 2009
If the black lines comes when using the ADF (top feeder), try to see if you get the same problem when using the scanner glass or receiving faxes. If you don't, you simply have to clean the glass strip to the left of the a4 sized scanner glass. Wipe it with a dry cloth piece, no paper and no water/alcohol. If you see some dirt there that you're unable to simply wipe off, try to use a cotton wool to "rub" it off.
Posted on Jun 14, 2009
First guess is you have a bit of dirt (often white-out from people scanning corrected paper that's not quite dry) stuck on the fax scan window. This should be described pretty well in your user manual (which you can download online from brother.com).
Its also possible that there is dirt (typically loose toner) on the laser scan window (there's a laser that shines through it to get the image pattern on the drum). That window is often along the bottom of the unit under the drum/cartridge (take the cartridge out and look). The Brother manual I've seen seems to ignore this possibility.
Print streaks DO NOT mean cartridge drum replacement in many cases !! On brother Intellifax or MFC or other laser copier/printer/fax, keep in mind that either the fax/copy scan window OR the laser scan window can get dirty. If the fax scan window is dirty, you see streaks on outgoing faxes and copies (but NOT incoming faxes). If the laser scan window is dirty, you see streaks on all prints (copies, faxes, print-from-computer).
Note also that when transporting/moving some laser copier with the toner cartridge inside, the toner can get out and make a big mess inside (including getting the laser scan window dirty). An air compressor can be usefull to blow it out. And sometimes using alcohol to clean is a BAD idea (maybe incompatible with plastic and rubber parts). A damp rag is probably fine.
Posted on Nov 21, 2009
Check out this page on our web site at:
http://www.ccl-la.com/dirty_scanner.htm This page shows you what to do to get rid of the lines on scans and copies.
I hope this helps, if so please rate our solution.
Posted on Jan 12, 2010
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