Oki B721 Maintenance Manual

Also see for ES7131: User manual User manual User manual

Contents

Oki B721 Maintenance Manual Manual pdf 182 page image

Oki Data CONFIDENTIAL45487001TH Rev.1 6-49 /6. Troubleshooting procedureCheck item Check work Actions to be takenat NG(3-2-4) 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.(3-2-5) Clutch operation checkPaper feed clutch,registration clutchCheck to make sure that the paper feed clutchor registration clutch works normally by usingthe Motor & Clutch Test of the self-diagnosticmode.Open the front cover so that the rollers can beseen to check.Replace thePU/CU board,or replace thepaper feedsolenoid.(3-2-6) Check the system connectionClutch cable forpaper feedCheck the connection condition of the cable.Check if the connector is connected inthe half-way only or not, and check if theconnector is inserted in a slanted angle or not.Check also that cables are assembled withoutany abnormality.Replace thecable with thegood cablethat normalizesthe connectioncondition.Cable for paperfeed clutchCheck that any cable is not pinched duringassembling of the printer.Remove the HOPCLT connector of the PU/CUboard and check the following at the cable side.Short circuit between pin-1 – FGRemove the HOPCLT connector of the PU/CU board and check that approx. 240Ω can bemeasured between pin-1 and pin-2.Replace theclutch andassembly itagain correctly.6.5.2.(4) Feed jam (Error 380)(4-1) Jam occurs immediately after the power is turned on.Check item Check work Actions to be takenat NG(4-1-1) 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.(4-1-2) Check condition of the mechanical partsCheck the sensorlevers of the paperentrance sensor 1,that of the paperentrance sensor2 and that of theWR2 sensor.Check if shape and movement of the sensorlevers have any abnormality or not.Replace thesensor with thegood sensorlever.(4-1-3) 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 the outputsignal levels of thepaper entrancesensor 1, that ofthe paper entrancesensor 2 and thatof the WR2 sensor.Check for the following signals at the FSNSconnector of the PU/CU board.Pin-4: Paper entrance sensor 1Pin-3: Paper entrance sensor 2WR2SNS connectorPin-2:WR2 sensorConfirm 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.