Oki Data CONFIDENTIAL45487001TH Rev.1 6-57 /6. Troubleshooting procedureCheck item Check work Actions to be takenat NG(8-2-3) Check condition of the paper running pathPaper invertingtransport pathCheck that any foreign materials such aspaper chip or blue do not exist that hampersthe smooth movement of paper in the paperinverting transport path.Removethe foreignmaterial.(8-3) Two-sided printing jam occurs during transporting paper inside the Duplex unit.Check item Check work Actions to be takenat NG(8-3-1) Sensor lever operation checkDup-F sensor lever Remove the Duplex unit and check movementof the Dup-F sensor lever.Replace theDup-F sensorlever.(8-3-2) Sensor checkCheck the detectioncondition of thesensor signalCheck the sensitivity of each sensor in thetwo conditions: one is the status in whichpaper remains in the duplex unit, and theother is the status in which no paper remainsin the duplex unit.Confirm that the sensor signals are normallydetected by using the SWITCH SCANfunction of the self-diagnostic mode.Replace thePU/CU boardor replacethe defectivesensor orconnectioncable.(8-4) Paper is not supplied from the Duplex unit to the regist roller.Check item Check work Actions to be takenat NG(8-4-1) Clutch operation checkDuplex clutch Confirm that the Duplex clutch works normallyby using the Motor & Clutch Test of the self-diagnostic mode.Confirm it by listening to thesound.Replace thePU/CU boardor clutch.6.5.2.(9) Paper size error (Errors 400 and 401)(9-1) Jam occurs when paper end is located near the IN1 sensor.Check item Check work Actions to be takenat NG(9-1-1) Check paper feed conditionMultifeed of papers Open the front cover and check if multifeed ofpapers occurs or not.If multi-feedoccurs againafter thejammed paperis removed,replace theretard roller ofthe tray in use.Paper size Does the paper size specified for print matchthe paper size of paper stuck in the tray.Change thespecified papersize or size ofpaper insidethe tray.Paper entrancesensor 1, paperentrance sensor 2Check if shape and movement of the sensorlevers have any abnormality or not.Replace thesensor leverwith the goodsensor lever.
