B052 (Gest. 232)

The shading plate and updated fw are the first things to try. As there are no clutches in the duplex unit, the code is telling you that the duplexed copy is late getting to the registration roller. And as I undrstand it, that time is measured from the on time of the duplex exit switch.
Also check that the lower rollers in the dup are clean and the transport plates are not broken at the top where they latch into place.
good luck

I guess you mean you aren'y getting any actual mechanical jams?? If so check out the mylars in the inverter unit. Do you have any image on the jammed sheets, and is the image in the correct place on the print.

What happens if you make one duplex print at a time?, jams?? Or does it just occur on multiple sheet runs?

Yes, there are no mechanical jams. The image on the simplex side is registered perfectly. The paper is then sent to the inverter with out any problem. However,the duplex image is either misregistered and exits the machine without a jam or the sheet lags so much ( and the duplex image is way off) that the paper ultimately causes a registration sensor off jam (i.e. code 63.) This happens on both single or mutliple page jobs.

Have you tried fresh paper. i.e. static.

I replaced the registration clutch and subsequently ran 500 duplex copies. The registration was 100% accurate. It seems counterintuitive to me that the clutch was only failing with duplex prints, but what the hey... it fixed the problem. Just thought I'd let you guys know. Thanks for the advice!