Does line go down the 11" side or across the 81/2? does it happen when you use document feeder? try on the big glass. slit glass maybe dirty the small glass used by the document feeder. start a copy stop it by opening up the machine during the copy cycle at temp to catch the paper under the drum is the line there? or after it comes out it could either be the drum/image unit or the fuser.
SOURCE: Thick Black Line on my copies and faxes
Can't image it being anything but scan glass, if prints are fine, are you sure you cleaning scan glass(inside of where originals are fed)?
If so then scanner lamp faulty, but I've never come across it myself on this model.
SOURCE: Konica Minolta magicolor 2430DL
Open the top cover. Remove the drum (part with long green handle). Below the drum you will see a strip of glass about 4-5 inches long. Take a cloth and wipe across the glass.
This will normally clear up any white lines in your print.
All you need to do is clean the top feeder which opens into two parts. make sure you clean the black rollers as well as the small strip of glass you will find when you open the second part of the top feeder . don't be afraid to pull open the top feeder it won't break
SOURCE: Black vertical line (1 inch wide) appears while scanning/copying
For this kind of problem you need to call the tech support because the printer is already messed up and it is in need of replacement
Hope this help
Byron
SOURCE: i have a Minolta CS Pro EP 1031 Printer that makes streak marks
Drum cleaning blade has gone bad. Especially true if the streaks seem to get progressively worse as you run multiple copies. In other words run 10 copies. If the last one out is worse than the first one out it is the drum cleaning blade. Cheap part...around $25
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
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