Originally Posted by
victoryprinting
I did replace the sub hopper unit and blew out the supply tube below the sub hopper unit, but it did not eliminate the problem with the black dropping out. I speculated that it could have something to do with the black developer unit. Upon digging down to the developers, I noticed that the black dev unit was somewhat hard to turn by hand - kind of like it was binding up. So I replaced that, and all is fine. The black is nice and solid now and not dropping out. Hope this helps someone in the future with similar issues.
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