How To fix error message "clean sensor" on Epson Aculaser C2600

Le message "Clean Sensor" ou "Détecteur Nettoyage" a plusieurs causes. 
Procedure 1:
The firts thing to do: open the cover (cover D):
Close it very slowly: it will clean the sensor.
Do it 2 or 3 times in succession:


Procedure 2:
Open the front cover (cover D)
Remove the waste ink box.
Clean the photoconductor wire: hold the cleaning knob and move it slowly in and out a few times (5-10 times):

Clean the exposure window: hold the knob (under the photoconductor cleaning knob) and move it slowly in and out a few times (5-10 times). 
Put back the waste ink box.
Close the cover
Power off the printer during 5 minutes

Procedure 3: When using remanufactured toner.
Verify each toner.

Procedure 4:
Look inside the transfert belt if a roller did not go out of its axis.