I've got a 2-year-old Minolta 2300 DL color laser printer which until the last month has run perfectly. Now, when I print out anything that uses black, I get some vertical black streaks on the page. It is not the full length of the page, and in fact often is some vertical streaks going across the page, but only for a small section - say 3/4 of an inch tall (as if there was a problem on only a section of a roller). I've cleaned any rollers/parts as per the owner's manual, but no change. All of the toner cartridges have adequate levels, and the drum is still relatively unused (only 18,000 printed pages on a drum with a "life" of 50,000 pages). Also of note - it is worse with pages that are only black and white. If it is a page with a mix of color and black printing, it seems to be less streaking and, in fact, often will print perfectly.
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Any chance you can post a scan of one of the faulty pages ? This will make it easier to assess the fault.
Print off about 10 pages of a page that is affected by the lines. Look at each page and see if you can detect a recurring pattern over any of the pages.
If there is a pattern, chances are it is probably the PCU that is marked.
Without actually seeing a print sample or the machine, my bet would be on the black print cartridge. Even though it reads a an acceptable level of toner, the cartridge itself sounds like it has developed a proble.
1. It's the most obvious
2. It't the cheapest place to start. If it does not correct the problem, you can still use it later.
3. It's the problem in about 80% of these types of cases.
4. I know it should be fine, but if things didn't go wrong, I wouldn't have a job!
Let me know. If not we'll investigate further.