Abstract: A method and apparatus for storing and verifying serial numbers using a smart label in an image production device is disclosed. The method for storing may include receiving a signal to query a smart label for serial number information, querying the smart label for serial number information, receiving the serial number information from the smart label, and storing the serial number information in a memory. The method for verifying may include receiving a signal to query a smart label for serial number information, querying the smart label for serial number information, receiving the serial number information from the smart label, determining if the serial number matches a serial number stored in the image production device, wherein if it is determined that the serial number matches the stored serial number performing requested image production device operations, otherwise sending an error signal.

Abstract: A method and apparatus for storing and verifying serial numbers using a smart label in an image production device is disclosed. The method for storing may include receiving a signal to query a smart label for serial number information, querying the smart label for serial number information, receiving the serial number information from the smart label, and storing the serial number information in a memory. The method for verifying may include receiving a signal to query a smart label for serial number information, querying the smart label for serial number information, receiving the serial number information from the smart label, determining if the serial number matches a serial number stored in the image production device, wherein if it is determined that the serial number matches the stored serial number performing requested image production device operations, otherwise sending an error signal.

Abstract: An interface circuit for an integrated injection logic circuit comprises a current mirror circuit having its input current value set by a first resistor and its input controlled by an output signal of the integrated injection logic circuit, a second resistor connected to a current path at the output side of the current mirror circuit, and output means connected to the current output terminal of the current mirror circuit.

Abstract: An I.sup.2 L logic circuit provided with a logic section which includes at least one I.sup.2 L unit circuit formed of a transistor for injector and a driving transistor.The I.sup.2 L logic circuit is further provided with a supply circuit for supplying the I.sup.2 L unit circuit with an injector current corresponding to a control signal. The supply circuit is formed of a first circuit for steadily supplying the I.sup.2 L unit circuit with a predetermined injector current, and a second circuit for supplying the I.sup.2 L unit circuit with another injector current in accordance with the control signal, the first and second circuits being connected in parallel with each other.

Abstract: The input stage of an amplifier circuit formed from first and second semiconductor differential amplifiers comprising a pair of transistors having emitter electrodes connected to each other, respectively. The respective collector electrodes of one pair of transistors in each of the first and second semiconductor differential amplifiers is connected to the respective collector electrodes of the other pair of transistors, the base electrode of one transistor of each pair of transistors respectively being connected to an input terminal of the amplifier circuit and the base electrode of the other transistor of each pair of transistors respectively being connected to first and second negative feedback circuits connected to the output stage of the amplification circuit. First and second electrical switches are respectively connected to the common emitter electrodes of each pair of transistors. One of the first and second electrical switches is controlled to be closed selectively.