Samsung CLX-8640ND - Black Developer Unit Is Not Installed. Install It

4.Troubleshooting
►ErrorCode
C8–5410
►Errormessage
Blackdeveloperunitisnotinstalled.Installit
►Symptom
Theblackdeveloperunitisnotinstalled.
►Troubleshootingmethod
1)Openthefrontcover.
2)Checkifalldeveloperunitisinstalled.Removeandre-installthedeveloperunit.
(Referto3.2.2DeveloperUnit.
)
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