Lexmark CX725
Remove the motor cover. See Motor cover removal.
Remove the right cover. See Right cover removal.
Disconnect the cable (A).
Remove the four screws (B), and then remove the motor.
Lexmark CS/X72x and C/XC41xx: Print Quality Diagnosis ? Light Print on Printed Page Colors
Lexmark C/XC41xx and CS/X72x: 200.13 Paper Jam Error and/or Grinding Noise when Printing