Samsung CLX-8640ND - Engine System Failure: #S2-1211. Turn off then on

4.Troubleshooting
►ErrorCode
S2–1211
►Errormessage
EngineSystemFailure:#S2-1211.Turnoffthenon
►Symptom
CommunicationerrorbetweentheASIConmainboardandmicrocontrollerIChasoccurred.
►Troubleshootingmethod
1)Turnthemachineoffandon.
2)Iftheproblempersists,turnthemachineoffagain.
3)Removetherearcover.
(Referto3.3.2RearCover.
)
4)Replacethemainboard(JC92-02516A)
(Referto3.3.7MainBoard.)
5)Assembletherearcover.Turnthemachineon.
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