I have to concur with this. We were getting a faint bluish line down near the left edge of the printout. Tried cleaning everything I could. The cyan toner was getting fairly low so I replaced it, line was completely gone. Just wonder how many copies I missed out on with the old toner cartridge though.
You either have a defective black toner, a bad fuser or transfer belt. From my experence it is usually a bad toner cartridge. After you print a couple of pages, pull the black toner and see if there is anything on the drum. If there is try shaking the toner, sometimes toner does like dirt and clogs up. If you still have problem you will have to try another toner. I know that is not cheep, but I don't know any other way.
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