I am working on a IBM Network 12 laser printer model 4312. The printer works fine from the manual front feed. When the paper is fed from the tray the paper stops as it hits the first set of rollers and gives the error P1 paperjam. There does not seem to be anything wrong. The printer is about 6 years old. Is ths a common problem on these printers? Is ther a repair kit for this? Thanks Pete