This problem is kicking my butt and causing me to pull what little is left of my hair out! Machine has only 160k on it. Only, but always, jams on duplex. Happens from all drawers. Always stops at reg. and kicks down B2 gate. Many times the rear side of the paper is folded over. Seems like should be obvious problem but damned if I can figure out.
Tried whole different duplex unit with exact results. Pulled reg. section out under dev. unit. Cleaned all sensors, removed, ck'd and cleaned guide plates and mylars. The bottom mylar gets pushed behind top Mylar. Don't know if this is what's catching paper or is result of the jam. If running multiple duplex copies there are usually two or three sheets stuck there, at B2 gate.
Also checked gate and plates that guide paper into duplex unit for burrs, all seem ok. Gotta go back again tomorrow(today) and try again. Not sure what's next. Any ideas much appreciated as I have three impatient women expecting me to fix this #%*@ machine!!!
yesterday i had the Exact same issue with 2060, 3 sheets stuck every time under registration in duplex mode after 10 or 15 copies,Machine is running @ 5 million,Mylar seal was worn out,cleaned the 2 sensors,gear with one sided bearing in at rear end of registration unit,also replaced upper Mylar seal, it's running like a dog,no more jams. as you mentioned copy volume is just 160K so it can't be Mylar either it's sensors because sometimes paper dust makes them blind or something stuck in paper path,Also take out the paper feed units and clean them,
Today I replaced the inverter unit and the entire unit under the dev unit which includes the registration rollers, mylars etc. No help. Another symptom that it is doing is the reg.rollers "lock up" after jamming at B2 gate. tried replacing the registration motor and driver board, no help. out of ideas, any more help much appreciated. thanks.