Oki Data CONFIDENTIAL43967002TH Rev. 1 327 /7. Troubleshooting7.5.2.(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 Action to be taken at NG(3-1-1) Check the 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 thesensor levers have any abnormality or not.Replace the sensorlever with the goodsensor lever.(3-1-3) Check condition of electrical partsCheck the detectioncondition of thesensor signal.Confirm that the sensor signalsare normally detected by using theMaintenance Menu SWITCH SCANfunction.Replace either thePU PCB or the frontsensor PCB (RSFPCB) or connectioncable.Check output signallevel of the paperentrance sensor1 and that of thepaper entrancesensor 2.Check for the following signals at the FSNSconnector number 16 of the PU PCB.Pin-4: Entrance sensor 1Pin-3: Entrance sensor 2Confirm that the above signal levels changewhen the sensor lever is operated.Replace the frontsensor PCB (RSFPCB)Check the powervoltages suppliedto the front sensorPCB (RSF PCB)Check the 5V power at the FSNS connectorof the front sensor PCB (RSF PCB).Pin-7: 5VPin-5: 0VLReplace theconnection cable.(3-2) Jam occurs immediately after the paper feed is started. (1st tray)Check item Check work Action to be taken at NG(3-2-1) Check the condition of the paper running pathPaper running pathof the front unitCheck if paper is jammed or not in thepaper running 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 thesensor levers have any abnormality or not.Replace the sensorlever with the goodsensor lever.Check the separatorassemblies of thefeed roller, thepickup roller and thetray.Check if any foreign materials such aspaper dust on the surface of the feed rolleror of the pickup roller or not.Remove the foreignmaterial.Check if the feed roller or the pickup rollerhas worn out or not.Replace theseparatorassemblies of thefeed roller, pickuproller and tray.(3-2-3) Motor operation checkPaper feed motor Confirm that the paper feed motor worksnormally by using the Motor & Clutch Testof the self-diagnostic mode.Replace the PUPCB or paper feedmotor.38. Paper feedmotor driverPaper feed motordriverRemove the HOPSIZE connector no. 1 ofthe PU PCB and check the followings atthe connector side.Several MΩ between pin1 – FG.Several MΩ between pin1 – FG.Several MΩ between pin1 – FG.Several MΩ between pin1 – FG.PU PCBreplacement
