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If the machine are telling you to change the DEVELOPER UNIT why did you change the toner and hoped to reset the massage?????????????
If the machine are telling you to change the developer unit you need to change the developer unit!!!!!
Do that and your problem is solved
This is an SC error related to the laser unit.
Switch off and on the printer. If the error still appears, the printer has a defective laser diode or a defective Laser unit.
Please call an engineer to repair your printer.
SC401: Transfer roller leak error 1 SC402: Transfer roller leak error 2 -Definition- [B] A transfer roller current leak signal is detected. The current feedback signal for the transfer roller is not detected. - Possible causes - · High voltage supply board defective · Poor connection of the PCU · Transfer/separation unit set incorrectly