I recently acquired the Ricoh 5550 in trade for a defective 5050. I just noticed, after printing out a larger photo, that every 5/8" there is a dark line all the way thru the image. These are horizontal lines, hairline in thickness, and especially evident in the blues. However, it does show up in all the colors. Suspecting the cyan, I printed a sample of a color with 0% cyan and I could still see it. I first assumed it was due to the printer sitting for 2 weeks while moving. Nope. I pulled out a coffee mug I did before this and I can see the lines, every 5/8". This is extremely annoying. Head cleanings, not surprisingly, were a waste of time. Anyone else experience this problem?