Black line on print out - Konica Minolta Minolta Bizhub C253 Copier

Check out Transfer cleaning Blade or Cleaning unit

Black lines on copy come from toner cartridge, or drum unit, or fuser unit which is in the back. check drum and see if you can see line, back of machine with flash light you may be able to see line on fuser roller. Be carefull Fuser is hot.
A copy that is good and then starts to get lines usually the drum unit...

hello replace black ink cartridge

me bashed it good

Canon printers do not like non Canon inks. Maybe other printers have similar issues but it seems that Canon is particularly finnicky.

Push menu on your printer, then fin maintainance. Then go to clean printer and push the green button. It will clean the cartridges for you and that should help. 

I was getting a verticle black line and I had to clean the glass, the long white bar above the glass, and the white and black rollers before my problem was solved.

If you try the print head alignment or head cleaning wizard under the maintenance tab, they may help!

Not sure what you have tried but if there are no lines when printing but there when scanning there is something on the scanner. Could be something as small a single dot of dirt and it will put a line down the whole page. Try cleaning the glass.