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There are several things that could be causing this I will TRY to address or suggest on all of them.
1.) If only appears when copying, double check the glass and make sure those areas are cleaned.
2.) If happens at all times, it could be the toner cartridge in the unit (especially if started when just changed). I would try another cartridge (later if you can stand the copies w/ the lines or if you have a spare).
3.) I have seen a lot of these machines do this putting vertical lines down the side of the paper because the fuser assembly has worn out and needs replaced.
I have seen #3 occur sometimes when paper gets jammed in a machine and someone pulls it out too rough, this can cause the slick cover over the fuser to crack, break, or bunch up, needing replaced.
inside the printer on the paper pulling roller there will be some powder got collected on it due to this a black line appears on the paper.the power faLLS FROM THE TONER WHEN THE WASTE POWDER COLLECTING SECTION IN THE TONER GETS FULL SO IT FALLS on the roller while printing and this happens.take a air blower .bolw in to all the parts of the printer.keep the printer off .remove the toner cartridge.and keep the toner assessing door opened.and then blow the air in the printer.and then check out.
It sounds like your having a fuser issue. Look at the lower rear side of the machine for the door. Remove the door by pressing in on the lower left tab. Remove the fuser to view the rollers. If the rollers have melted toner on them, that's your problem.