IfFanDoesNotOperate; IfFanDoesNotOperate - Samsung RFG298HD Service Manual

TROUBlESHOOTING

4-2-2.IfFANdoesnotoperate

-TherefrigeratorofthismodelhasBLDCFANmotor.BLDCmotorisdrivenbyDC7~12V.
- O nthenormalconditionofCOMPON,itoperatestogetherwithF-FANmotor.
Ifdoorisopenedandclosedonceatahighambienttemperature,itwillbeoperatedafter1minute
delay.
Therefore,youareadvisednottotakenitforanerror.
-.Ifthereisatrouble,youshouldselecttheself-diagnosticfunctiontocheckthetroublebeforepoweroff.
IsthevoltagebetweenMAIN
PCBGroundJ23JUMMPERandCN
76"5"(Sky-blue)aroundDC7~12V?
Istheexternaltemperature
above66.2℉(19℃)?
Recheckafter7minutes
(Timecouldbedelayed
dependingonthe Door
temperatures.Ifthe
temperatureislower,It
Close
maynotoperate:about
Open
59℉ (below 15℃)
DoesDC7~12Valternatewith
belowDC2VbetweenMAINPCBGroundJ23
JUMMPERandCN76"5"(Sky-blue)
FFANpulsevoltage PCBTypicalGround
CN76"7"(Brown) J23JUMMPER
Thevoltagemeasuredaround2~3V
withmulti-meterthoughthevoltageis
veryweakbecauseofpulsesignal
☞  D isplayforcheckingtheself-diagnosticfunction
RFANERROR
FFANERROR CFANERROR
(Option)
IsthevoltagebetweenMAIN
PCBGroundJ23JUMMPERandCN
76"4"(Orange)aroundDC7~12V?
IsthevoltagebetweenMAIN
PCBGroundJ23JUMPERandCN
76-"12"(Purple)around0V?
Door&MICOMState
FMICOM RMICOM(#28)
(#29)
RightandLeft
0V(Low)
5V(High)
0V(Low) 5V(High)
DoesDC7~12Valternatewithbelow
DC2VbetweenMAINPCBGroundJ23
JUMMPERandCN76"4"(Orange)
Reference
CN76-7(F),8(R),9(C)willgeneratethepulsesignalwhenmotorrotates.
ThesesignalswillbeinputtedintoMICOM.
Unlesssignalsarenotinputtedduringmotoroperating,willbeON10
secondsafterfanOff.Butifsignalsarenotstillentered,theabove
operationwillrestartfourtimesmore.
Ifsignalsarenotenteredcontinuously,themotorwillberestartedafter10
Minutes.Thisfunctioniseffectivewhenthenormaloperationofmotor
wouldberestrainedbyforeignmatterssuchasice.
ThevoltagebetweenPCBtypicalGroundJ23JUMMPERand
FFAN;CN76"3"(yellow)shallbelessthanDC7~12V.
RFAN;CN76"4"(Orange)shallbelessthanDC7~12V.
CFAN;CN76"5"(Sky-blue)shallbelessthanDC7~12V.
-Recheckifresistancevaluesaredifferentaftermeasuring.
1)F-FAN
Start
IsCOMPRESSORON?
IsthevoltagebetweenMAIN
PCBGroundJ23JUMMPERandCN76
"3"(yellow)aroundDC7~12V?
IsthevoltagebetweenMAIN
PCBGroundJ23JUMMPERandCN76-
"11"(White)around4.5~5V?
PowerONwith7minutes delay
afterpowerOFF.
Forpreventingtheoverloadof
compressor)
DoesDC7~12Valternatewith
belowDC2VbetweenMAINPCBGround
J23JUMMPERandCN76"3"(yellow)
•Expectedcauses
CheckthatifFAN-MOTORhasfailureitself.
①
Checkthatifwiringconnectionhasbadcontact.
②
 C hecktheinputofthefanmotorrotationpulse
③
whenmotorfanoperates.
2)R-FAN
73
Executemanual
operation
FANworknormally
Repairtheconnection
ofDoorswitch
Ininitialpowertoappliance,thecompressor
andfansoffreshfood/freezer,compressor
fanoperate.Iffreezertemperatureissensed
of 41℉bymomentarypowerfailure,fanswill
operateafter7minutes.
ReplaceMAINPCBGround
PCBTypicalGround
J23JUMMPER
3)C-FAN