44072903TH Rev.1 187 /Oki Data CONFIDENTIAL 7. TROUBLESHOOTING PROCEFRURES7.5.2.(8) Duplex Print Jam(Error 370, 371, 372, 373, 383)(8-1) Duplex print jam occurs right after turning on the powerConfirmation Items Confirmation Tasks Action at NG(8-1-1) Check of state of running routePaper running routein duplex unitCheck to see if there is paper jammed on therunning route.Open the front cover and see if there is paperjammed in the middle of feeding through theDuplex. Open the rear cover and see if there ispaper jammed in the reversal path.Draw out the Duplex and see if there is paperjammed at the insertion inlet to the Duplex.Open the running path cover of the Duplex andsee if there is paper jammed inside.Remove thejammed paper.(8-1-2) Check of state of mechanical partsCheck the sensorlevers of the sensorsof Duplex.Check to see if the sensor levers demonstrateany abnormal shape or motion.Replace thesensor leverwith a normalone.(8-1-3) Check of electrical partsCheck the stateof sensor signaldetection.Use the SWITCH SCAN function of the self-diagnostic mode to check to see if the sensorsignals are detected normally.Check the state of signal detection in twocases: With a sheet of paper placed inside theduplex unit and with the paper removed.Replace theDuplex PCB(V7Y PCB),sensors or con-nection cord.(8-2) Duplex print jam occurs in the Duplex entryConfirmation Items Confirmation Tasks Action at NG(8-2-1) Check of operating state of solenoidDuplex solenoid Conduct the Motor and Clutch Test of the self-diagnostic mode, and check the operating stateof the Duplex solenoid.Replace theV7Y PCB or so-lenoid.Separator DUP(Delivery/ DUP-intake switchinggate located im-mediately after fuserunit)Conduct the Motor and Clutch Test of the self-diagnostic mode, and check visually the motionof the gate (EXIT SOLENOID). See if its motionis stiff, or its amount of opening/closing isabnormal.Replace theseparator DUP.On/off timing ofduplex solenoidConduct test print with the cover open, and seeif the separator DUP opens at the right timing.Replace the WRsensor lever orsolenoid.(8-2-2) Check of operating state of sensor leverDup-IN sensor lever Open the rear cover, touch the Dup-IN sensorlever by hand, and see if its motion is stiff.Replace theDup-IN sensorlever.Dup-IN sensor Use the SWITCH SCAN function of the self-diagnostic mode to check to see if the sensorsignals are detected normally.Replace theduplex PCB(V7Y PCB),sensors or co-nnection cord.(8-2-3) Check of state of running routeReversal transportpathCheck to see if there are paper chips, burrsor any other foreign matters in the reversaltransport path that obstruct the running ofpaper.Remove theforeign matters.
