Dell 922 printer jam

Question

My 922 is jamming the paper as it loads. It looks like it is being fed okay on the right where the roller is but the left side of the paper is not moving into the printer area. I read your suggestion about checking that trays are aligned and paths are clear. I do not see any obvious paper stuck or trays out of alignment but don't know how to actually manipulate the printer. I cannot see much from the paper tray or from below the cover. Is there a way to clean the rollers etc? I do see lots of dust. Any suggestions would be appreciated. Thanks.