Digital BW, The Print

I am quite new to inkjet printing and I am not sure whether my
problem is what you would call banding. 

Anyway, on all my prints, in the same position, I get a "white"
hair-thin line running virtical from top to bottom. Its position 
is the same regardless of the print (ie the same distance from 
the left edge of the paper) which leads me to  believe that 
something in the printer is scratching my prints as they move 
through the printer. I say scratch because there doesn't seem 
to be any ink on  this very fine line. It can only be seen if the 
light hits the print at a certain angle.

I did an alignment check, nozzle check and cleaning, cleaned the
rollers with  windex and air brushed them afterwards. This has 
had no effect. I have tried several adjustments of the paper 
thickness lever, no results either.

Is this a form of banding? I  would very much appreciate any help or
advice you could give me. I forgot to mention that I am printing on 
a 1290 with generation 4 color inks.

Thanks

Jeff Hargrove