New Printers, New Approach

The print engine's logic and control unit computer performs adjustments based, in part, on input from two monitoring devices. A vibrating reed electrostatic voltage potentiometer monitors the charge level on the photoconductive image loop, while an infrared logarithmic transmission densitometer measures the mass of the toner developed on the loop. System adjustments produce consistent density in solid areas, while maintaining sharpness in line edges and halftone dots.