Container configuration matching system

An electrophotographic apparatus comprising:

• a process cartridge including a wall, an outside surface, and a chamber, the chamber for storing particles therein;
• and
• a developing unit including a spring member associated therewith, the spring member adapted to move from a first position when the process cartridge is operatively engaged and close an electrical circuit of a voltage line and adapted to move to a second position when the process cartridge is removed and open the electrical circuit;
• wherein in the second position the open electrical circuit on the voltage line eliminates the high voltage power supply to the electrophotographic apparatus.

A method of determining the configuration of a container in a printing or copying apparatus comprising:

• providing a plastic container adapted for use in a developer unit, the container defining a wall, an outside surface, and a chamber;
• associating a resistor member with the plastic container, the resistor member having a length, width, thickness, and selected resistance value, the resistor member being made of an electrically conductive material;
• providing a sensor system and an electrical circuit adapted to identify a resistance value of the resistor member on the container when the resistor member is functionally associated with the electrical circuit;
• contacting the resistor member with the electrical circuit in conjunction with the container being functionally associated with a developer unit;
• identifying the resistance of the resistor member;
• and
• communicating a fault signal when a container of incorrect configuration is associated with the developer unit, the signal being triggered based on the identified resistance of the resistor member being outside an allowed target range programmed in a window comparator circuit.