Digital BW, The Print

Hi all... I'm noticing some banding in large black areas using the BO method on a 
2200.  These don't seem to be missing lines of ink, as it would be if a head were 
clogged.  The bands are about 1/4" wide and vary in tone from the deepest black to a 
dark gray, in a pattern of repeated 1/4 to 3/8" stripes.

Any ideas would be appreciated :-)

Ed Rudolph