Description: Developing screw rotation detection
Error in the difference between the maximum and the minimum of ATR Sensor (C) detection value.
Remedy: Possible cause: The screw is not rotating due to failure in the coupling between the main body and the Developing Assembly, or the value of ATR Sensor (C)(UN41) failed to be read due to an electrical trouble. 1. Remove the Drum Unit (C) and check no damage. (Replace the Drum Unit (C) if defective) 2. Lift the pressure lever after the Drum Unit (C) is pushed all the way in. 3.Check failure of the harness between the Drum Unit (C) and the DC Controller PCB (UN09/J25) (trapped cable, open circuit, connector disconnection) 4.Check the Drum Unit Relay PCB (C) (UN28) (Soil/ deformation/ damage) 5.Check the Drum Unit Memory PCB (C) (UN32) (Soil/ damage) 6.Replace the Drum Unit (C). 7. Replace the DC Controller PCB (UN09). 8. Replace the Main Drive Unit