Oki Data CONFIDENTIAL45487001TH Rev.1 6-48 /6. Troubleshooting procedure6.5.2.(3) Paper feed jam (Error 391: 1st Tray).(3-1) Jam occurs immediately after the power is turned on. (1st tray)Check item Check work Actions to be takenat NG(3-1-1) Check condition of the paper running pathPaper running pathof the front unitOpen the front cover check if paper is notjammed in the paper running path.Remove thejammed paper.(3-1-2) Check condition of the mechanical partsCheck the sensorlevers of the paperentrance sensor1 and the paperentrance sensor 2.Check if shape and movement of the sensorlevers have any abnormality or not.Replace thesensor leverwith the goodsensor lever.(3-1-3) Check condition of electrical partsCheck the detectioncondition of thesensor signal.Confirm that the sensor signals are normallydetected by using the Maintenance MenuSWITCH SCAN function.Replace eitherthe PU/CUboard or thefront sensorboard (HSC-2 PCB) orconnectioncable.Check output signallevel of the paperentrance sensor1 and that of thepaper entrancesensor 2.Check for the following signals at the FSNSconnector of the PU/CU board.Pin-4: Paper entrance sensor 1Pin-3: Paper entrance sensor 2Confirm that the above signal levels changewhen the sensor lever is operated.Replace thefront sensorboard (HSC-2PCB)Check the powervoltages suppliedto the front sensorboard (HSC-2PCB)Check the 5V power at the FSNS connectorof the front sensor board (HSC-2 PCB).Pin-1: 5V power supplyPin-5: 0VLReplace theconnectioncable.(3-2) Jam occurs immediately after the paper feed is started. (1st tray)Check item Check work Actions to be takenat NG(3-2-1) Check condition of the paper running pathPaper running pathof the front unitCheck if paper is jammed or not in the paperrunning path.Remove thejammed paper.(3-2-2) Check condition of the mechanical partsCheck the sensorlevers of the paperentrance sensor1 and the paperentrance sensor 2.Check if shape and movement of the sensorlevers have any abnormality or not.Replace thesensor with thegood sensorlever.Check the feedroller, pickup rollerand the retard rollerassembly of thetray.Check if any foreign materials such as paperdust on the surface of the feed roller or of thepickup roller or not.Remove theforeign material.Check if the feed roller or the pickup roller hasworn out or not.Replace thefeed roller, thepickup roller andthe retard rollerassembly of thetray.(3-2-3) Motor operation checkPaper feed motor Confirm that the paper feed motor worksnormally by using the Motor & Clutch Test ofthe self-diagnostic mode.Replace the PU/CU board orthe paper feedmotor.
