japrim

asked Mar 20, 2017 at 4:38pm
Hp HP Color LaserJet 4650DN

jam in duplex

In an HP 4650

When I try to print both sides the paper comes out of the hopper then back down as it should and jams at the bottom of its travel... It seems to be about 2" inside the paper tray when it stops, I am not a tech but am handy at most DIY stuff, so I looked at the rollers as it said in the service manual and they look clean and unworn, nothing seems to be blocking the paper path so has anyone got any suggestions as to what it may be?