Question about Brother MFC-9840CDW Laser Printer
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Posted on Jan 02, 2017
If this only happens when you are copying.
1. Your scanner glass is dirty. Open the lid, use windex to clean the flatbed. Look on the left side. You should see a strip of glass, with the scanner sitting under it. This strip is used when the document feed is being used. Make sure it is clean. Most common problem is getting a little whiteout or the sticky residue from scotch tape on this glass, which causes lines down your copies.
Clean it with alcohol which will dissolve the sticky stuff and the whiteout.
If this does not solve the problem, the CCD scanner in your machine might be going bad.
Posted on Dec 30, 2007
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
This can happen if the ink dries out for a long time. Try to power flush the color that doesn't work.
Press the Menu/Set, *, 2, 8, 6 and 4 keys within two seconds. (if you fail to complete the correct key sequence within two seconds, press the Stop key to try again).
press 7 then 6 then 4 then start black copy. This will fill the tubes with ink.
press 7 then 6 then 3 then start black copy. You may use the right arrow to choose the color you want to flush before you press the black copy button.
Press 99 to exit maintenance mode
Press the ink button and do a test print for print quality and see if the color you flushed works. If not, try again.
This is the only way to fix the dried print head. Otherwise you have to replace the print head, in which case, you might as well buy a new printer.
Posted on Dec 10, 2010
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