Samsung CLX-8640 series - Error Code S5-3111; UI System Failure #S5-3111:Turn off then on

4.Troubleshooting
►ErrorCode
S5–3111
►Errormessage
UISystemFailure#S5-3111:Turnoffthenon.
►Symptom
CommunicationerrorbetweenmainboardandOPEboardhasoccurred.
►Troubleshootingmethod
1)Removetherearcover.
(Referto3.3.2RearCover.
)
2)CheckiftheOPEcableisconnectedtothemainboardcorrectly.
3)RemoveanddisassembletheOPEunit.
(Referto3.3.20OPEunit.
)
4)CheckiftheOPEcableisconnectedtotheOPEboardcorrectly.
5)IftheconnectionisOK,replacethemainboard(JC92–02516A).
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