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1、Secondtypicalelectromagneticovenoverhaulexercise-andnonnetwork（第2节典型电磁炉的检修演练--与非网）Generaltechnical
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9、romagneticovenoverhaulexercisesRecommendedforfriends,printadd,updateon2008-07-1820:54:214.2.1operationdisplaycircuitboardoverhaulFigure4-32showstheelectromagneticovenoperationdisplaycircuitboard,thecircuitboardbymicrocontrolswitch,capacitor,resistor,light-emittingdiode,crystal
10、triodeandoperationdisplayinterfacecircuit(shiftregister)andsoon.Figure4-32electromagneticovenoperationdisplaycircuitboardWhenusinganinductioncooker,manualinstructionsareinputbyoperatingthemicroswitchonthedisplaypanel.Thatiswhenthepressbutton,theoperationdisplayinterfacecircuit
11、(shiftregister)artificialinstructionsignalthroughthedatalineconnectedtotheotherendofthemicroprocessor.Atthesametime,theoperationdisplayinterfacecircuitcontrolsthedisplayoftheLEDunderthecooperationofthemicroprocessor,andrealizesvariousfunctionsoftheelectromagneticoven.Forexampl
12、e:theoperationofthepowerswitch,thepowerindicatorwilllight;fireoperationselectionkey,therewillbeacorrespondingdisplaylightemittingdiodethermalluminescence;operationtimingbutton,willhavethecorrespondingtimeofthelightemittingdisplaylightemittingdiode.Whendetectingthecomponentsont
13、hedisplaypanel,itcanberemovedtodetect.Ifthesignalontheoperationpanelisdetected,theenergizationtestisrequired.Theoperationdisplaycircuitisshowninfigure4-33.TheSW4toSW8inthedrawingisamicroswitchinanelectromagneticoven.Theelectromagneticovenusesamicroswitchwithcontacts.Duringoper
14、ation,thesignalsofeachinchingswitcharesenttotheintegratedcircuitIC1inseriesresistance.TheintegratedcircuitIC1isacircuitforgeneratingartificialcommandsignals,anditsmodelis74HC164.Theclocksignalinputfromthefoot,thefootandthefootistheinputendofthedrivingpulsesignal.Atwork,thekeys
15、trokecommandsarefedintotheIC1.IC1isactuallyashiftregister,the
