I'm printine on 2 part carbon paper, lt leaves a faint line when printing, like where the print head travels on the roller. Don't notice it when ribbon is new, but at it wears it gets worse. I always use Okidata ribbons.
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It looks like you've managed to get some ink on the rollers. 3 Possible solutions:-
1) Check your printer maintenance menu, there may be a roller cleaning option.
2) Print a document which has printable data on almost all lines, but with empty cartridges. You'd be using a piece of paper more or less as a mop.
3) Final alternative, it getting right into your printer and cleaning it by hand. Printer ink is water soluble so damp cloths/cotton buds should be man enough for the job. The parts you need to concentrate on are the rollers and the small sponge wells underneath where the print cartridges rest.
that only means that the nozzles of your printer for the colored ink are clogged by dried inks but for black, its not, you can try printing a nozzle check to prove or check that. and if you found out that it has missing lines, do head cleaning
if older printer or well used printer (All laser printers if they have print quality issues - it is mostly either the toner or the fuser). the only way to tell is get (borrow) a toner and see if problem is the same or remove the fuser (the hot thing in the printer) and see if the "ironing" unit or fuser rollers are dirty or worn out or scratched
most likely you have a flat spot on the roller.
that is exactly what is going to happen, when the paper hits the flat spot or a low spot. the paper stops and skips. them the print is coming out smeared.
you can get a repair kit or replacement roller from HP.
1. Do you use refilled or genuine Canon cartridges?
2. Anyway, try to clean the printheads, because they seam to leak.
3. Verify if the cartridges are correct alignet (in maintenance software you have soewhere an "align cartridges" function
Doubt it be the fuser(100 000life), "just magenta dots".... fuser would be "all smudged" or "black marks" , "the print rubs off" , "paper is creasing or jamming"
Can prove it by stopping a print (open door) when paper is1/2 way threw machine, you need to stop it before it goes threw the hot bit, so you can tell if the hot bit (fuser) puts the marks on the paper.
Transfer roller one would expect to effect whole print Smudged/Faint,uneven density
It will be the imaging unit ( 30 000 pagelife Ouch$ ) or possible leaking toner (if aftermarket)
Remove imaging unit and inspect film you should find image of lines, dots are usually chips or sticky stuff on drum surface, carefull no oily human fingers on surface please.
When stopping machine mid print and perfecting your timing, pull out the imaging unit and look at replica of your print notice if marked and where.