Savin MP6002 with SC990, 330K, in a school admin office. Code would not reset. Checked firmware, all up to date. Bypassed surge protector, disconnected Ethernet cable and HDD, rebooted, tried to print out a counter sheet. Counter sheet printed, but as soon as it hit the output tray on the finisher, the machine coded. Tried printing an SMC, but coded after page 1. Tried each tray, same results, UNTIL I used the bypass tray. Hmmmmm. Ran through all the output checks with no issues, for the heck of it I went to the paper feed board and checked the connections - one seemed like it wasn't seated all the way. Buttoned it back up, printed SMC fine, countersheet fine. Reconnected everything and tested it, ran fine. Strange...... but I'll take it!