I have another Kyocere fs-1800. This printer will take the paper from the bypass tray first if I have paper in the bypass tray. If not it will take it from the drawer. I have purchased a fs-4000dn. It will only take the paper from the drawer. I can not get it to take the paper from the bypass tray. Is there a setting somewhere that I need to set to make it take paper from the bypass tray first?

SOURCE: set up KYOCERA FS-1350DN printer

you need to scroll thru your menus...paper handling section...make sure mp tray is set to FIRST..that way it will pull from the mp tray untill it is empty than switch to your cassette

SOURCE: Kyocera FS-4000DN Laser Printer call for service

that's just a toner motor error..most likely the toner was not put in properly..remove the toner than reseat the toner making sure it snaps secure into place..you should than be fixed

SOURCE: how to i stop paper jams on kyocera ecosys

The first thing you need to do is open the device and clear any debris: leftover paper pieces, toner, etc. If this does not fix the jamming, the device could use a more thorough service. Inspect all of the moving parts and make sure that they are firmly attached. If it's possible to tighten down some components, a minor tweak with a screwdriver can work wonders.
Something a little unorthodox, but that has helped me in the past is lubrication. You could try lubricating the printer with mineral oil or paper shredder oil. There are two ways of doing this. You could open the machine up, locate rollers and then brush the oil onto the rollers. Or you could simply put a very then layer of mineral oil on a piece of paper and then run the paper through the machine. The first few pages out of the machine will have oil on them, but after a half dozen pieces or so, the parts should operate more smoothly and be less likely to jam.
I hope that helps.