Apparatus including and use of an enhanced toner area coverage sensor to monitor filming levels on a photoreceptor surface

A printing machine comprising

• a photoreceptor having an image forming surface;
• a charging station to provide a charge to the image forming surface of the photoreceptor;
• an exposure station to form a latent image on the charged image forming surface of the photoreceptor;
• a developing station to provide toner particles and develop the latent image on the image forming surface of the photoreceptor;
• a transfer station to transfer the developed latent image from the image forming surface of the photoreceptor;
• a cleaning station to remove residual toner particles remaining on the image forming surface of the photoreceptor following transfer;
• and
• at a point downstream from the cleaning station, an enhanced toner area coverage sensor mounted in a manner enabling movement of the sensor over the image forming surface of the photoreceptor.