I am having an ongoing issue with this copier's ADF. The jam is usually SPPD3_N with SPPD2_S thrown in every 5th jam it seems.
The paper seems to get hung up right before the SPPD3 sensor. I think it sounds like the paper is hitting something between the top door guide and the lower guide.
I have replaced DF feed rollers and SPPD2 and SPPD3 sensors.
I have cleaned the transport rollers and they still seem to have treads.
I added one wrap to the spring for the SPPD 3 actuator and I placed some mylars from one guide to the next.
It seems seems to jam for me every 4 to 5 sheets.
Thanks for any help.