Oki Data CONFIDENTIAL43967002TH Rev. 1 330 /7. TroubleshootingCheck item Check work Action to be taken at NG(4-2-4) Check the system connectionPaper feed motordrive cableCheck the connection condition of thecables.Check if the connector is connected inthe half-way only or not, and check if theconnector is inserted in a slanted angle ornot. Check also that cables are assembledwithout any abnormality.Normalize theconnectioncondition.Replace the cablewith the normalcable.Paper feed motordrive cableCheck that any cable is not pinched duringassembling of the printer.Remove the HOPSIZE connector of thePU PCB and check the followings at thecable side.Short circuit between pin1 – FGShort circuit between pin2 – FGShort circuit between pin3 – FGShort circuit between pin4 – FGReplace the cablewith the good onethat normalizesthe connectioncondition.Paper feed motor Remove the HOPSIZE connector of thePU PCB and check that approx. 3.4 ohmscan be measured between pin1 -pin-2 atthe cable end, and that approx. 5 ohmscan be measured between pin3 -pin-4respectively.Replace the paperfeed motor.7.5.2.(5) Paper feed jam (error code 390: Multipurpose tray)(5-1) Jam occurs immediately after the power is turned on. (Multipurpose tray)Check item Check work Action to be taken at NG(5-1-1) Check the condition of the paper running pathPaper running pathof the multipurposetrayCheck if paper is jammed or not in thepaper running path.Remove thejammed paper.(5-1-2) Check condition of the mechanical partsCheck the sensorlevers of the paperentrance sensor 2and the WR sensor.Check if shape and movement of thesensor levers have any abnormality or not.Replace the sensorlever with the goodsensor lever.(5-1-3) Check condition of electrical partsCheck the detectioncondition of thesensor signal.Confirm that the sensor signals arenormally detected by using the SWITCHSCAN function of the self-diagnostic mode.Replace either thePU PCB or the frontsensor PCB (RSFPCB) or connectioncable.Check the sensoroutput signal level ofthe paper entrancesensor 2 and theWR sensor.Check for the following signals at the FSNSconnector of the PU PCB.pin2: WR sensorpin3: 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).pin1: 5V powerpin5: 0VLReplace theconnection cable.
