When paper jam occurs in colour image reader C1 fitted to C5035 ,When customer removes a Jam the only way you can clear jam is to turn r/h side main machine switch off then back on. Reader works fine until jam occurs there is no pattern of jams all different codes over a six week period reader does not jam excessively considering it is heavily used. Have reloaded latest firmware, INT sensors in service mode all set up ok. Fault still occurs when reader paper jams. Any thoughts please could it be a control PCB issue.