On my Brother DCP-7040, when using flatbed or auto feeder to scan the copies come out with large black streak down middle. Any suggestions?
Hi
Open your scanner lid and make sure their is no dirty marks sitting on your scanner glass. Also does this happen on the scanner glass or when using the ADF? If its on the ADF its most likely that the glass is dirty and needs to be cleaned. 
Testimonial: "Thank you for getting back and for the pic (very helpful). It only happens when scanning both from ADF and Flatbed. When printing it is fine. So is it still probably the glass needs to be cleaned."
There are 3 possible issues here:
1. You may have to clean the glass, both sides maybe, & it requires a technician to do it. If you're not scanning or copying, just printing & it still has a black streak on printouts, you may;
2. have a bad drum, you need to replace it with brand new toner cartridge. If it has some burnt "film-like" debris;
3. you may have a damaged fuser-film. You may have to replace it.
Testimonial: "Does not do it when printing. Only does it when scanning from ADF and Flatbed. Do you think it is glass that needs to be cleaned?"
SOURCE: black line when scanning though auto feeder
pls clean the side glas of scnner with tissue paper ther is two type of glass is there one is a4 size and second is normal slim one so pls clean the slim one with wet tissue paper and see is ti clean .
bye
SOURCE: HP LaserJet 2840 Scanner problem
Yes, but I don't see any actual paper jams. I have a Vista O/S and I've been reading that that might be the problem; the 2840 scanner driver is not compatible with the Vista O/S and HP hasn't produced a solution yet. I appreciate your efforts, thanks.
SOURCE: HP Officejet 6300 All-in-one machine makes black streaks
The problem is that that there a small piece of glass that the doc feeder use's to scan the orginal. You will have to clean the small glass it's about a half of a inch piece and is normally under the doc feeder unit. It will either be to the right side of the main copy board glass or it is under the doc feed unit where the paper goes down through the feeder. It is mostly some white out on the glass, just clean with a dam cloth with water or windex..... Good Luck
SOURCE: Black line down the middle of scanned documents.
Try leaving the cover open and run a test scan, once with a fresh sheet as the item to be scanned and then a second time without anything on the table.
You may see what is blocking the light source or possibly a defect in it.
Scanning is done left-right, left-right across the width of the page and the vertical stripe indicates that the blockage is present during each scanned line.
In servicing copiers and multifunction machines, I have found a number of curious contaminents, one of the most annoying was a moth, still alive, that would randomly sit on the lamp, causing some pages to come out OK, others not.
If your copies and printouts are coming out fine, then only the scanner can be at fault.
SOURCE: vertical black line in scan document not in copies through document feeder
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.
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