Pages printed from the manual paper feed seems to come out "dirty". The entire length of the page seems to be printed with a bit of a "haze". I've calibrated and run the printer through the cleaning mode. What could be the problem? Seems to be worse when printing on heavier paper.
Upon closer inspection, it appears that printing from the paper tray on plain paper is a bit dirty too. So, not limited to manual feed, and not limited to heavier paper/cardstock, although it is certainly worse in those conditions.
The attachment is a scan of part of a page printed on cardstock, manual feed.