Does it jam or does it not feed the paper twice, or does it feed it twice and not output the 2 sided job?
Does it print duplex?
The User manual from FujiXerox (It is not a Xerox product so we don't have them in North America) states it has an ADF and not a DADF (Duplex Automatic Document Feeder) so I know it would have to feed the paper twice..