I have two of these printers in use. I have noticed that every time I print, there is a slight whitish/greyish shadow (bar) on the left side of the printout. You can see it quite well when light falls on the sheet; otherwise you only see it at second glance. Nevertheless, it is disturbing. This "bar" is visible from top to bottom on every leaf. As if something is wrong with the roller. As I said, on both printers.... Does anyone have the same phenomenon?