Lexmark CX725
Remove the transfer module. See Transfer module removal.
Open the front door.
Remove the sensor (media type). See Sensor (media type) removal.
Remove the screw (A).
Disconnect the sensor cable (B), and then remove the sensor.
Prevent paper feed and jam problems in your ADF from happening again. Replace the ADF input tray the fastest way with these steps.
Lexmark CS/X72x and C/XC41xx: Print Quality Diagnosis ? Light Print on Printed Page Colors