I hope someone can help! I have a Canon ix-6820 photo printer. Each time I print, I get a line of small black dots along the bottom edge of the paper. I've tried cleaning the rollers and bottom plates but to no avail. I also cleaned the print heads and when I print the nozzle check, it prints clean and clear (with the exception of the line of black dots.) I have brand new full ink cartridges. Any other suggestions?