When using thick paper (cardstock, photo paper, labels, etc), many times customers call in with jamming problems. Use of the bypass tray with the correct paper setting should remedy the jamming issues. Sometimes the problem is that the toner isn't sticking to page. The copier needs to be set to recognize thick paper because the fuser needs to get hotter to fuse the toner properly to the paper. Click on the link below to see how to set your copier/printer for the correct paper.
Lanier, Ricoh, Savin, Gestetner