I have a Xerox Phaser 3117 Laser Black and White Printer. When print, half of the paper come out to the out-put tray. Other half still in the fuser unit. Stop printing and red light indicate. When I check the print out, all details have printed. But, first row of my details have moved very top of my A4 paper.( Whole document moved 2-3 inches above[to the top of the paper]. What is this and how to resolve this problems( Paper Jam and document move to top of the sheet)????