Samsung Xpress C480FW - Error #U2-6120 Turn off then on; Error #U2-6140 Turn off then on

4.AlignmentandTroubleshooting
►ErrorCode
U2-6120
U2-6140
►Errormessage
Error#U2-6120Turnoffthenon
Error#U2-6140Turnoffthenon
►Symptom
LSUMotordoesnotworknormally./LSUHsyncsignalisabnormal.
►Troubleshootingmethod
1)CheckiftheLSUharnessonthemainboardisconnectedproperly.
2)IfitisOK,checkthattheLSUharnessonLSUboardisconnectedproperly.
3)CheckiftheLSUharnessisdefective.
4)Iftheproblempersists,replacetheLSU.
5)IftheproblempersistsafterreplacingLSU,replacethemainboard.
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