is this unit on a stand? large paper travels under tray 2 when duplexed , is there any thing interfering with its path?
yep its on stand with 2 lower drawers
first side is copied ok and then jam in both doors upper and lower
cuold not see anything interfering with paper...
it goes easily when i move it by hand
If it has drawers it is a DB not a stand. The DB is part of the paper path when duplexing. Longer paper actually feeds under the DB then back up. At the bottom of the DB there is a metal slot for the paper to feed into. There is a mylar glued to the slot entrance, if this mylar has been damage long paper will mis-feed while shorter paper feeds fine. Check the mylar if it is damaged just peel it off and clean the glue from the guide, I have found they will run fine without this mylar.
Like mrwho said, codes? How many copies? Had probs duplexing when the paper exit actuator(26NA53170) gets worn down. Same with the reversal actuator 26NA50071.
DESCRIPTION: J97-2 occurs when duplexing.
CAUSE: The actuator for PS4 (ADU PS) is binding.
SOLUTION: Check the actuator for PS4 (p/n 26NA50070) for binding. Replace as needed.
__________________________ ' "But the salesman said . . ." The salesman's an asshole!' Mascan42
KONICA 7135 jams when duplexing A3 size paper 
Linear Mode
