The first parts you should check for jams are your printer's paper trays. Laser printers have two, check both. If it seems clear from there, go deeper into your printer, and open doors that allow you to see inside the printer and check for jams. These usually apply to medium-size business laser printers. If your printer says it's jammed but you can't locate it, it's possible that shreds of paper get stuck and trigger a printer jam.