佳能传真机复杂故障维修(canon fax machine complex troubleshooting)

佳能传真机复杂故障维修(canon fax machine complex troubleshooting)

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时间:2018-07-19

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1、佳能传真机复杂故障维修(Canonfaxmachinecomplextroubleshooting)CanonfaxmachinecomplextroubleshootingCanonT-22faxmachinedoesnotwork

faultphenomenon:poweron,LCDdisplaywithoutanyindicationonthepowersupplyisnotlit.
analysisandoverhaul:disconnectthepowersupplyshel

2、l,checkthatthefusetubehasbeenburned.Afterchangingthe3Afusetube,the500typemultimeterisusedtomeasurethecharginganddischargingphenomenaatthetwoendsoftheACinput,indicatingthatthereisstillashort-circuitfaultinthecircuit.Removeswitch(2

3、ice.baoxiu.com/baoxiu/point_query.jspxbrandId=243outletswarranty?"Target=_blank>SK1081),tomeasuretheresistancebetweenthepolesarezero,whichindicatesthatthetransistorhasbrokendown,andtheinspectionfoundasmallholeinapulsewidthmodulationcontrolcrackplateTDA4605.Afterrepl

4、acing2SK1081andTDA4605withnewpartsonebyone,thereisobviouschargeanddischargeintheACinputofthemeasuringpowersupply,butafterthepowerswitchisswitchedon,thepowerindicatorflashesout,andthereisnooutput.Afterfurthercarefulexamination,foundthatthecapacitance22J/63Visconnectedwit

5、hTDA4605andfootafinecrack.ThecapacitanceisremovedandthecapacitanceismeasuredbyDT-902capacitance/inductancemetertoindicatethatthecapacitanceisinfinite,indicatingthatthecapacitorhasbeendamaged.

treatmentmethod:afterthereplacementofcapacitor22J/63testmachine,trou

6、bleshooting.


2,acopyofCanonFAX-T31faxcopyblackbars
faultphenomenon:copy.Thefirstcopyisnormal,butsecondcopiesrightabout40mmwideblackbars,acopyofthecopythenhaveblackbars.
Analysisandmaintenanceof
:thecauseoftheblackbarsare:

7、>

1)opticalpartnot;
2)thereisaproblemwiththethermalrecordinghead;
3)CCDrelatedcircuitdamage.
inaccordancewiththeprincipleof"easybeforedifficult"maintenanceprinciple

8、,thefirstobservationofLEDlight-emittingarrayofnormallighting,andnodirtshelter.Then,thethermalrecordingheadtest

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