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do the lines go off the edge of the paper?
if so either the black drum unit or the belt has gone bad.
if the lines stop before the edge of the paper it could be on the print job itself.
go through the menu and look for demo pages or the configuration pages to print and examine them.
Fuser hot belt has wear lines transfering to the page
Black pcu needs to be replaced
Transfer unit is not being cleaned properly and needs to be replaced.
Remove each of these assy and inspect them for wear or lines that corespond to the lines on your prints.
have a look at the scanner glass especially the thin strip glass this is the glass that is used when passing paper through the document feeder. if you do a copy from the main glass or print to it and no line apears there is probably dirt or tipex or a ink mark on the surfac, the other thing to look at os the drum charge unit as htese can sometimes fail to connesect correctly at the back and not sit tight in the slot this means the drum isnt charged on the edge.. good luck
remove the drum by opening the LHS of the printer & removing the toner waste bottle, then depress the grey button on the drum assembly & firmly pull the assembly out. Best done in a darkish room as the drum is light sensitive.
The black line couldn't be fixed as it is caused by a scratch less that 2mm long on the drum. Ether a new drun at £299 or a new printer ar £245..
Hi best way to check is to remove the black photoconductor and you should be able to see the little lines on it also check the the black dev/toner unit for the lines. most likely to be the black photoconductor unit though.