First off do you have the d model? If you go into the menu on the printer under the diagnostics menu there is a paper path test. One of the options when doing the test is to turn duplex on. Do a one page test with duplex on and see if it works. If the option is not there, then you do not have a duplex printer and I do not know how you did it before unless you may have used an earlier driver that allowed for manual duplex where you have to physically move the paper to tray 1 to print the second side in reverse order.
↧