Electrophotographic control in imaging devices, including sensing current between a developer roll and drum pertaining to current of a latent image and a paschen breakdown

In an imaging device having a photoconductive drum opposed by developer roll to provide toner to the drum to develop a latent image on the drum for transfer to media or an intermediate transfer member and later the media, further including a power supply in communication with a controller, a method comprising:

• with the power supply, setting a first voltage on a charge roll that creates a second voltage on a surface of the drum;
• based on the first and second voltages, transferring the toner from a developer roll to the drum;
• sensing a current between the developer roll and the drum;
• and
• providing a resistor through which the current is sensed and the sensed current having a corresponding voltage being amplified and provided to the controller.

In an imaging device having a supply of toner in communication with a toner adder roll for providing the toner to a developer roll opposing a photoconductive drum to develop with the toner a latent image on the drum for first transfer to an intermediate transfer member and second transfer to media, further including a high voltage power supply in communication with a controller, a method comprising:

• with the power supply, setting a first voltage on a charge roll that creates a second voltage on a surface of the drum;
• based on the first and second voltages, transferring the toner from a developer roll to the drum;
• sensing a current between the developer roll and the drum, including determining a first current of the latent image and a second current of a Paschen breakdown between the developer roll and the drum, further storing the first and second currents in a memory accessible by the controller, the controller subtracting from the current the first and second currents;
• and
• providing the current or corresponding voltage to the controller for determining a mass of the toner for setting with the power supply an operating voltage on the drum or developer roll.