I went out on a tech assist call yesterday on 5501 with intermittent black marks on copies (see attached pdf) pretty much in the same place. I originally thought this was a K transfer roller issue so I proceeded with installation of 200K pm kit...(only had 55 percent usage on belt) I seen this problem in the past, but all my tricks did not seem to resolve the issue... 63 percent on the black developer unit, all new transfer rollers, belt and clean blade, replaced K drum...check all bushings and bearings on the tension plate bracket... verified there tensions springs that hold the dv units in place were installed correctly, ran all color reg adjustments.... reviewed the knowledge base... checked bias voltages ete... The problem doesn't happen on every copy but does show up when duplexing... also replaced the K transfer power bushings and springs...
I've seen this before, but either I'm getting to old and loosing it, or breathing in all that fedron many years ago has caused pre-mature brain cell loss....
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