Samsung RFG298HD Service Manual
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73TROUBlESHOOTING-TherefrigeratorofthismodelhasBLDCFANmotor.BLDCmotorisdrivenbyDC7~12V.-OnthenormalconditionofCOMPON,itoperatestogetherwithF-FANmotor.Ifdoorisopenedandclosedonceatahighambienttemperature,itwillbeoperatedafter1minutedelay.Therefore,youareadvisednottotakenitforanerror.-.Ifthereisatrouble,youshouldselecttheself-diagnosticfunctiontocheckthetroublebeforepoweroff.4-2-2.IfFANdoesnotoperateStartIsCOMPRESSORON?Door&MICOMStateDoorFFANpulsevoltageCN76“7”(Brown)Thevoltagemeasuredaround2~3Vwithmulti-meterthoughthevoltageisveryweakbecauseofpulsesignal☞Displayforcheckingtheself-diagnosticfunctionPCBTypicalGroundJ23JUMMPERFMICOM(#29)CloseOpen5V(High)0V(Low)0V(Low)5V(High)RMICOM(#28)RightandLeftExecutemanualoperationFANworknormallyRepairtheconnectionofDoorswitchReplaceMAINPCBGround1)F-FANPCBTypicalGroundJ23JUMMPERPowerONwith7minutes delayafterpowerOFF.Forpreventingtheoverloadofcompressor)•Expectedcauses① CheckthatifFAN-MOTORhasfailureitself.② Checkthatifwiringconnectionhasbadcontact.③Checktheinputofthefanmotorrotationpulsewhenmotorfanoperates.CN76-7(F),8(R),9(C)willgeneratethepulsesignalwhenmotorrotates.ThesesignalswillbeinputtedintoMICOM.Unlesssignalsarenotinputtedduringmotoroperating,willbeON10secondsafterfanOff.Butifsignalsarenotstillentered,theaboveoperationwillrestartfourtimesmore.Ifsignalsarenotenteredcontinuously,themotorwillberestartedafter10Minutes.Thisfunctioniseffectivewhenthenormaloperationofmotorwouldberestrainedbyforeignmatterssuchasice.ThevoltagebetweenPCBtypicalGroundJ23JUMMPERandFFAN;CN76”3”(yellow)shallbelessthanDC7~12V.RFAN;CN76”4”(Orange)shallbelessthanDC7~12V.CFAN;CN76”5”(Sky-blue)shallbelessthanDC7~12V.-Recheckifresistancevaluesaredifferentaftermeasuring.IsthevoltagebetweenMAINPCBGroundJ23JUMMPERandCN76”3”(yellow)aroundDC7~12V?IsthevoltagebetweenMAINPCBGroundJ23JUMMPERandCN76”5”(Sky-blue)aroundDC7~12V?IsthevoltagebetweenMAINPCBGroundJ23JUMMPERandCN76”4”(Orange)aroundDC7~12V?Istheexternaltemperatureabove66.2℉(19℃)?Recheckafter7minutes(Timecouldbedelayeddependingonthetemperatures.Ifthetemperatureislower,Itmaynotoperate:about59℉ (below 15℃)IsthevoltagebetweenMAINPCBGroundJ23JUMPERandCN76-"12"(Purple)around0V?IsthevoltagebetweenMAINPCBGroundJ23JUMMPERandCN76-"11"(White)around4.5~5V?DoesDC7~12ValternatewithbelowDC2VbetweenMAINPCBGroundJ23JUMMPERandCN76“3”(yellow)DoesDC7~12ValternatewithbelowDC2VbetweenMAINPCBGroundJ23JUMMPERandCN76”4”(Orange)DoesDC7~12ValternatewithbelowDC2VbetweenMAINPCBGroundJ23JUMMPERandCN76”5”(Sky-blue)Ininitialpowertoappliance,thecompressorandfansoffreshfood/freezer,compressorfanoperate.Iffreezertemperatureissensedof 41℉bymomentarypowerfailure,fanswilloperateafter7minutes.Reference2)R-FAN 3)C-FANRFANERROR(Option) FFANERROR CFANERROR |
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