236Chapter 6 Operating the printing systemFinal tasks for installing the developer station9.[303]Close the photoconductor drumdoor.[304]CautionPrint problems possible.Clean the toner mark sensor before you begin to print.10.Cleaning the toner mark sensoron page278.11.Close the center door at the back of the printing system.12.Close the left and right door at the front of the printing system.13.Click on the 'Ready' button.Proceed as follows:
