Samsung Xpress C480FN - Error: #U1-2320 Turn off then on

4.AlignmentandTroubleshooting
►ErrorCode
U1–2320
►Errormessage
Error:#U1-2320Turnoffthenon
►Symptom
Thetemperaturecontroloffuserunitisabnormal.(OpenHeatError)
►Troubleshootingmethod
1)Checktheharnessconnection.
•Checkiftherelatedharnesslikeathermistorharness,fusermotorharness,SMPSharnessisconnectedcorrectly
anddefective.Reconnectorreplacetheharness.
2)ChecktheSMPSTRIACShorttest.Iftestresultisabnormal,replacetheSMPSboard.
a)ChecktheSMPSTriacresistanceforeachterminalwithDVM.
•NormalV alue
-A-B:30MΩ~Open(Innite)
-A-C:10Ω~100Ω
-B-C:30MΩ~Open(Innite)
•AbnormalV alue
-A-B:0Ω~10Ω
3)Checkthemainboardopentest.
•ChecktheADCportoperationandH/Wprotectoperation.
-ThermistorOpentest:Afterunpluggingthefuserconnector,checkiftheU1–2320erroroccurs.Ifthe
erroroccurs,themainboardisnormal.Ifnot,replacethemainboard.
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