HP Mopier 320

[wchill]

I am having 13.1 paper jam errors in our 320 Mopier when trying to print duplex. Single sided printing works fine. It recently had a maintenance kit, (fuser and rollers) installed and the trouble started shortly thereafter. I've substituted a known good duplexor with no results, and I've reinstalled the old rollers but to no avail. The old fuser was mechanically shot so I can't reinstall that to eliminate the new fuser as being the culprit. Same symptoms from all 3 paper drawers. It appears to me as a timing issue because the paper isn't jammed, it just stops. Sure would appreciate some help on this. Thanks in advance for your help.

Bill