We recently replaced an HP Laserjet 4100 with an HP Laserjet P3015 that is on an AS400 / iSeries print writer. After installation, the staff was getting frustrated because the AS400 writer kept stopping saying that operator action was required, as if there was a jam, the paper was out, etc. However, there was nothing wrong with the printer.
The fix was to do a "wrkdevd writername" and choose option 2 to change, then change the "Printer error message" setting to "*INFO".
More info from IBM here: http://www-01.ibm.com/support/docview.wss?uid=nas8N1018688