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1、施乐XEROX1027复印机故障维修六例（XeroxXEROX1027copiertroubleshootingsixcases）Example1.Malfunction:themachinestopsworkinganddisplaysthestatuscodeof"L8".Faultanalysis:the"L8"statuscodemeansthattheglasstemperatureofthedrafttableistoohigh,thatis,theglassthermistorofthedrafttabledetectsthattheglasstemperatureofthed
2、rafttableishigherthan50degreescentigrade.Judgingfromthefaultphenomenon,thetemperaturemeasurementdeviceisgood,andtheglasstemperaturecontrolcircuitandtheopticalcoolingfancomponentandrelatedcircuitsshouldbeexamined.Troubleshooting:remindusersandmaintenancepersonnel,itisimportanttonotethatwhen"L8"appea
3、rswhenthemachinestopsworking,buttheopticalcoolingfanisstillrunning,theopticalsystemofcooling,untilthe"L8"methodisusedtoeliminate,notshutdowncooling,sothewaitingtimeislong.Whenthe"L8"statuscodeappears,themachinestopsworking,buttheopticalcoolingfandoesnotoperate,soitispreliminarilydecidedthattheoptic
4、alcoolingfanandtherelatedcircuitshaveproblems.Input10-1diagnosticcodesforopticalcoolingfantest,theopticalcoolingfanisstillnotrunning;pressstop/clear"button,cancelfunctioncode1,withamultimetermeasuringP57-10andP57-3100VACvoltage,theopticalcoolingfan100VACandthenenterthenormalpowersupply;functioncode
5、1andpresscopybutton,measuringP414voltagewithamultimeterfor24V+DC(normalshouldbe0VDC),themaincontrolboard,interfacecircuitofU6soweshouldcheckthemaincontrolboard(8255),U38(74LS04)andU41(7406N).Inthediagnostic/nondiagnosticstate,the12pinsoftheU38aretestedwithlogicalpens,respectively,andthelevelofthe13
6、pinsvaries,whiletheU38isnotdamagedbyanychangesinthefoot.TroubleshootingafterchangingU38.Exampletwo:malfunction:thepaperisstuckonthefeedconveyorandthemachinedisplaysthe"E3-3"statuscode.Faultanalysis:thecauseofthefaultphenomenongenerallytherearethreepossibilities,oneisthetransmissionbeltagingrelaxati
7、on,duringoperationoftheconveyorbeltdoesnotmoveorstop,shouldcheckwhetherthenormalfunctioningoftheconveyorbelt;twoisthevacuumfandoesnotturnorinlowspeed(vacuumfanisaDCmotor,inthecopyingprocessinthehigh-speedop
