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Failure in detection about the changes of ON => OFF =>
ON with the sensor which detects a full rotation of the supply
screw within the specifed period of time.
Remedy
1. Check the damage of the Developing Coupling.
If it’s damaged, replace the Developing Assembly.
2. Check the damage of the coupling (with the Developing
Assembly) at the Host Machine side.
If it’s damaged, remove the Main Drive Unit to replace the
coupling.
3. Turn the motor as a single unit while the Drum/Developing
Assembly is removed to check rotation of the Main Drive
Unit.
If it does not rotate, replace the Motor.
If the above measures do not solve the problem, replace the
Drum Driver PCB (UN4).
If there still remains the problem, replace the Main Drive
Unit.
4. Remove the Hopper Unit and manually turn the Supply
Input Gear to check rotation.
If it’s results in NG, replace the Hopper Unit.
E025
0120
05
Title
Y Mismatched phase
Description
Set-on Unit detects opening of the Y Toner Container as well
as the Small Door.
Remedy
1. Check if the Small Door can be closed.
2. Close the Small Door and turn OFF and then ON the
power to check recovery.
3. Check the installation of the Open/Close Sensor of the
Small Door (to see if it’s installed at the correct position).
4. Check the Sensor Harness (to see if the harness is
caught, disconnected or physically removed).
5.(If the above measures do not solve the problem,) Replace
the Drum Driver PCB (UN4)
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