Duplexer problem I just installed a used duplexer for my LJ 4 + printer. The printer works fine in simplex before the duplexer was installed. The duplexer seems to work, but not correctly! I have set up the printer in the Settings > Printers > LJ4+ > Properties > Device Settings > Installable Options > Duplex Unit "Installed" So it should function properly. In duplex mode, paper is supposed to feed into the printer and print the second page first, then it goes through the duplexer and is turned over and the first page is supposed to be printed and the paper exits into the upper finished page tray. What my unit does is to feed the paper into the duplexer first and then turn it over and then print the second page and feed the paper direct to the finished copy tray. Then it prints the first side on a SECOND sheet of paper, without ever sending a sheet through the duplexer. Does anyone know of a sensor or possibly a failed roller that might be the offending part that doesn't send the paper on the correct path through the printer/duplexer combo? Any other ideas?