44015503TH Rev. 1 194 /Oki Data CONFIDENTIAL 7. TROUBLESHOOTING PROCEDURE7.5.2.(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 takenat NG(5-1-1) Check condition of the paper running pathPaper running pathof the multipurposetrayCheck if paper is jammed or not in the paperrunning 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 the sensorlevers have any abnormality or not.Replace thesensor with thegood sensorlever.(5-1-3) Check condition of electrical partsCheck the detectioncondition of thesensor signal.Confirm that the sensor signals are normallydetected by using the SWITCH SCAN functionof the self-diagnostic mode.Replace eitherthe PU boardor the frontsensor board(RSF PCB)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 board.Pin-2: WR sensorPin-3: Paper entrance sensor 2Confirm that the above signal levels changewhen the sensor lever is operated.Replace thefront sensorboard (RSFPCB)Check the powervoltages suppliedto the front sensorboard (RSF PCB)Check the 5v power at the CN connector ofthe front sensor board (RSF PCB).Pin-1: 5v power supplyPin-5: 0vLReplace theconnectioncable.Check item Check work Action to be takenat NG(4-2-4) Check the system connectionPaper feed motordrive cableCheck the connection condition of the cable.Check if the connector is connected in the half-way only or not, and check if the connectoris inserted in a slanted angle or not. Checkalso that cables are assembled without anyabnormality.Replace thecable with thegood cablethat normalizesthe connectioncondition.Paper feed motordrive cableCheck that any cable is not pinched duringassembling of the printer.Remove the HOPSIZE connector no. 1 of thePU board and check the followings at the cableside.Short circuit between pin-1 – FGShort circuit between pin-2 – FGShort circuit between pin-3 – FGShort circuit between pin-4 – FGReplace thecable with thegood cablethat normalizesthe connectioncondition.Paper feed motor Remove the HOPSIZE connector of thePU board and check that approx. 3.4Ω can bemeasured between pin-1 -pin-2 at the cable end,and that approx. 5Ω can be measured betweenpin-3 -pin-4 respectively.Replace thepaper feed motor.
