For Canon MX330 I get a white vertical streak (one character wide) in the exact middle of the page, and character fragmentation. The problem is exactly reproducible, i.e., exactly the same bad page is printed each time. Did printer head alignment, cleaning, replaced cartridges. Characters are not lost on printing; the streak 'pushes' the rest of the line to the right.
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They are manny cause of black copy.
2.arching on main charger or dirt on main charger.
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you need to clean the rollers. consult the manual about cleaning the copier. if you don't have a manual, then get some methyl alcohol (any alcohol that evaporates completely will do). use a lint free cloth to rub a small amount of alcohol on all roller surfaces (accessible via pull-down compartments on front and back, usually).
They are not in the middle as shown in the manual. I still can't find them. God! this printer is only that big and I spent three days looking at every possible corners and gaps and still can't see where the ink cartridges are. Will not buy this Canon printer again.
You can pull out each cartridge and shake it gently
to redistribute the toner. Try a half page test to eliminate the
various stages of the image formation. The timing on this is not easy
but through trial and error it can be helpful.
Depending on the type and model of your printer this could be several things mostly related to the cartridge or drum if you have a separate toner/drum system.. Since you have stated you have shaken the toner, I am assuming you have a laser printer. New belt, has me confused. Green thing leads me to think you are talking about the drum. If so, did you purchase a new toner cartridge or new drum cartridge?
Several components inside the toner or drum cartridge will cause vertical streaks. It depends on where these streaks are occurring and how wide the streaks are. We call these repetitive defects and they can be measured to determine which part is at fault.
Also, if this is a multi-unit machine (print/copy/fax/scan) Check the platen glass or ADf feed unit for white out. That has been a major culprit of vertical streaks on the page.
More specifics about the model of machine and cartridges being used would be helpful in trying to solve this problem for you.