I had a LJ 4350 that would pull an extra page after any print job over 2 or 3 pages but would never throw a jam code. I didn't find anything on here but did find the solution on an HP forum and thought I'd share it with everyone. On the front right side near the gear assy is a little solenoid. It's black with 2 black wires and an L arm plate with small spring. The pad on the solenoid under that plate will wear down and the adhesive resin will cause that L plate to stick and feed an extra sheet of paper that will jam up underneath the drum. So just a heads up if anyone comes across this. Just clean up the L plate and solenoid surface and place some electrical tape there. Also I don't know what it is with HP but why do the torque down the easiest to strip screws in their machines!
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