Digital BW, The Print

hello everyone. i want to thank all that responded to my clog busting post.
i got several very helpful replies and am now in the process of trying them
out. hopefully one of them will work soon!

i have a new problem now. it's a banding problem on my Photo 870, printing
grayscale images with the black ink only. not the typical microbanding from
clogged nozzles or misaligned print heads (i've had enough of those to
recognize them). no, this one is one i've never seen before. it is wide
banding that occurs only in the 1/4 tones and runs perpendicular to the
direction the print heads print. i've posted a scanned print of a 1/4 tone
patch that shows this phenomenon quite clearly (after a curves adjustment to
increase contrast for viewing purposes).

can anyone take a look and tell me what might be causing this? the jpeg is
posted at:

http://www.frankvena.com/banding.jpg

much appreciated. and thanks again for the help with the clog that ate
Vancouver!

Frank Vena