Digital BW, The Print

Hello. I am getting banding when I print with my HP 9800. I am
printing B&W with the photo grey cartridge. The results are great,
except for the banding. When I do print color, it also shows banding. It
does not show banding in every print, but I would say it does on a
frequent basis. I have tried new cartridges and it still bands. Any
suggestions? Also, can anyone advise using this printer to print BO? 
Thank you.



Francis





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