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I have worked on a same problem recently on several different machines. Tried replacing developer and adjusting doctor blade, with no result. Only replacing whole development unit solved the problem. I think the problem is faulty magnetic roller...
Try replacing the cleaning blade.I had 2 copiers ,the one with the problem on cyan and magenta dev.units,and spent a day replacing from one to the other.I saw an improvement by changing the cleaning blade.Maby you can change the lubricant bar also.I thing this is caused by vibrations,on the drum by the cleaning blade.Stil got some banding lines from time to time(that is why i am telling you to replace the lubricant bar also ,i did not) but not like the original problem wich was exactly like yours......
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