Paper jams can occur once in awhile when printing; however, frequent problems may need further investigation. Listed below are a few things to consider before placing a service call.
Labels can cause many problems if one peels off inside the machine. When using labels, always make sure there are no label edges that have "turned up" slightly and exposed the adhesive surface.
Sometimes when removing a paper jam, a small piece is left behind. Make sure the entire page is there when you remove it.
Worn or dirty paper feed rollers can sometimes "slip" and cause a paper jam. If you believe this is your problem, TURN OFF THE MACHINE AND REMOVE THE POWER CORD. Remove the paper tray (if it is not attached) so you can easily access the feed roller(s). Lightly dampen a small cloth or Kleenex with water, then scrub the roller and let it air dry. If this does not help, you may need to have the feed roller replaced.
Odd noises prior to a paper jam may indicate a broken gear somewhere inside the machine. If your machine has another paper tray, try printing from it to better isolate the problem.
Heavy cardstock and certain types of slick or coated paper can cause frequent paper jams. To better isolate the cause of your problem (machine or paper), try a new ream of regular 20 lb copy or laser paper.