An image forming apparatus includes a main unit, a main unit memory, a drum cartridge, a toner cartridge, and a controller. The main unit memory stores printer identification information. The drum cartridge includes a drum memory that stores drum identification information. The toner cartridge includes a toner memory that stores toner identification information. The controller is configured to store in the main unit memory the drum identification information stored in the drum memory and store in the drum memory the printer identification information stored in the main unit memory, if it determines that the drum cartridge installed in the main unit is new, and store in the main unit memory the toner identification information stored in the toner memory and store in the toner memory the drum identification information stored in the drum memory, if it determines that the toner cartridge installed in the main unit is new.

According to one embodiment, an image forming apparatus includes an image forming unit, a first temperature sensor, a second temperature sensor, a cooling mechanism, and a controller. The first temperature sensor detects the internal temperature of a machine body where the image forming unit is arranged. The second temperature sensor detects the environmental temperature of the environment where the machine body is placed. The cooling mechanism cools the image forming unit. The controller adjusts the cooling capacity of the cooling mechanism based on the result of comparing the internal temperature detected by the first temperature sensor with a first threshold, and the result of comparing the environmental temperature detected by the second temperature sensor with a second threshold lower than the first threshold.

According to one embodiment, an image forming apparatus includes an image carrier, a cleaning member, a determination unit, and a control unit. The image carrier carries a developer image. The cleaning member removes a developer adhering to a surface of the image carrier by a frictional force when the image carrier is rotated in a first direction. The determination unit determines an image forming amount in a plurality of continuous image forming jobs. The control unit rotates the image carrier in the first direction during the image forming period and in a second direction opposite to the first direction at reverse rotation timing, and changes a condition for rotation in the second direction according to the determination result.

In an example, a method includes printing a set of images by transferring print agent between a roller of a print agent source and an electrophotographic surface in a plurality of transfer operations, wherein the roller is controlled to have a first voltage profile during each of the transfer operations. A variation in optical density which is consistent across the set of printed images may be detected, and a second voltage profile correction may be determined based on the variation in optical density. The method may further comprise printing a subsequent image by transferring print agent between the print agent source roller and the electrophotographic surface in a subsequent transfer operation, wherein the roller is controlled to have the second voltage profile during the subsequent transfer operation.

An image forming apparatus including a print engine, a power supply device, a plurality of temperature sensors, and a processor. The print engine including a fuser. The power supply device to selectively provide power to the fuser. The plurality of temperature sensors including a first temperature sensor and a second temperature sensor to sense temperature of the fuser. The processor to control power supplied to the fuser based on a value measured by at least one temperature sensor from among the plurality of temperature sensors. The processor is to identify whether the at least one temperature sensor of the plurality of temperature sensors has an abnormality based on a first measured temperature value and a second measured temperature value of the plurality of temperature sensors.

An image forming apparatus includes: a developer carrier; a screw-shaped developer feeder that feeds developer to the developer carrier; an image carrier on which an image is imaged with toner of the developer; a developing current detector that detects developing current between the image carrier and the developer carrier during imaging; and a controller that detects image density failure that is periodic and oblique to a rotation direction of the image carrier. The controller causes a stripe image to be imaged on the image carrier and analyzes change of the developing current with time during imaging of the stripe image, thereby detecting the image density failure. The stripe image has a width in a length direction of the image carrier narrower than a period of a blade of the developer feeder and has a length in the rotation direction longer than a period of the image density failure.

An image forming apparatus includes a photosensitive member, a charging member configured to charge a surface of the photosensitive member, a power supply configured to apply the DC voltage to the charging member, a current detection unit configured to detect a current value flowing from the charging member to the photosensitive member, a calculation unit configured to calculate a first voltage value based on applied voltages with different voltage values and detected current values, a setting unit configured to set a second voltage value to be applied to the charging member during forming of the image. The setting unit sets the second voltage by adding the first voltage value, a target voltage value, and a correction value corresponding to a peripheral speed of the photosensitive member during forming of the image.

An image forming apparatus includes a photosensitive member, a charging member for charging the photosensitive member, a cleaning member that comes into contact with the charging member and moves relative to the charging member to clean the charging member, an opening/closing member for exposing an inside of the apparatus, and a driving mechanism that moves the charging member and the cleaning member relative to each other in association with opening/closing of the opening/closing member.

A shutter output portion is engaged with a shutter input portion of a developer container and supported to be displaced between an opening position and a closing position. The shutter output portion, when located at the opening position, opens a shutter of the developer container, and when located at the closing position, closes the shutter. A main interlocking mechanism causes the shutter output portion to move in conjunction with opening and closing operation of the cover portion such that the shutter output portion is displaced to the opening position when the cover portion is closed, and to the closing position when the cover portion is opened. The main interlocking mechanism includes a switch mechanism that releases an interlock between the shutter output portion and the closing operation of the cover portion in accordance with a release operation, and enables the interlock in accordance with an enabling operation.

An image forming apparatus includes an electric board extending to a first direction and a second direction, a board accommodating portion cover the electric board, a recording medium accommodating portion to cover a recording medium and a connecting portion. The recording medium accommodating portion is arranged side by side with the board accommodating portion in the first direction. The connecting portion is arranged to overlap with the board accommodating portion and the recording medium accommodating portion as seen in a third direction perpendicular to the first and second directions, and connects the board accommodating portion and the recording medium accommodating portion. The board accommodating portion and the recording medium accommodating portion are directly fixed to the connecting portion, respectively.