I just got finished changing out the black developer. Still having gray banding. I tried swapping the print cartridges around like you said and the problem pretty much went away. I am gussing it was a bad black print cartridge all along. One more question after I did changed the black developer...
I am having a problem with my phaser 7700 printer. It only seems to occur on about the 8th to 10 page and get worse the more pages that are printed. The first 6 or 7 pages are usually fine. I get horz. streeks, that vary from about and inch wide to maybe 2 1/2 inches, measure from top to bottom...
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