Hey, Im currently having same 016-910 error with all my recent prnting jobs, can you please explain to me how du you mean setting the tray to dedicated? Thank you very much :))
Here are the instruction on how to set the tray priorities, you can also take a look at an article for the error code 016-910.
To change the tray settings from the printer control panel:
To change the tray settings from the Embedded Web Server: