It keeps picking paper crooked from cassette(?) and damages right edge of paper and prints skewed image onto paper. I've swapped cassettes (from a copier that has no problems). I rotated paper feed tire on the hub (I didn't have any new tires with me) to make sure no bald spot on tire. I can run 800 blank pages without a single problem but every day it seems a few come out with edges damaged. I've tried different toner cartridges. Any thing else I'm missing? Thanks