having trouble with this machine getting j19s. Replaced actuator sensor above reg roller and ran 150 duplexed copies with no jams...hmmm..prob solved. Hour later get a call back saying it's doing it again. Replaced duplex clutch ran 75 with no jams. Hour later call saying it's doing it again. Had them use just letter-r tray and not getting any problems. Later in the day they used letter tray again for 2-2 (65 copies) with no problems. Looking for some suggestions! Thanks for reading..
Check the four screws on the underside of the fuser. If the front screw is the wrong one, it catches the duplex / transfer baffle. It is the one without the washer.
The registration sensor is below the reg roller. The code means its not making it from duplex 4 to the reg sensor. Check the pinch rolls and spring are still there.
LT-R always runs better it seems, especially on heavier stock.