Abstract: An image forming device includes a developing unit, which is removably inserted in the image forming device, and the developing unit includes an accumulating chamber, a developing member, and a storage medium. The accumulating chamber accumulates developer. The developing member moves the developer onto an image carrier and carries out an image forming process. The storage medium stores control information for determining a developing bias to be applied to the developing member, and usage performance information of the developing unit necessary for determining the developing bias.

Abstract: In an image forming device, when a replacement timing of a photoconductive drum unit has been reached, the image forming device determines whether or not a replacement timing of a developing unit is close, but not yet actually reached. When the replacement timing of the developing unit is close but not yet reached, the image forming device collectively displays a message to urge the user to replace both the photoconductive drum unit and the developing unit at the same time to avoid problems such as a foggy image.

Abstract: An image forming device includes a developing unit, which is removably inserted in the image forming device, and the developing unit includes an accumulating chamber, a developing member, and a storage medium. The accumulating chamber accumulates developer. The developing member moves the developer onto an image carrier and carries out an image forming process. The storage medium stores control information for determining a developing bias to be applied to the developing member, and usage performance information of the developing unit necessary for determining the developing bias.

Abstract: In an image forming device, when a replacement timing of a photoconductive drum unit has been reached, the image forming device determines whether or not a replacement timing of a developing unit is close, but not yet actually reached. When the replacement timing of the developing unit is close but not yet reached, the image forming device collectively displays a message to urge the user to replace both the photoconductive drum unit and the developing unit at the same time to avoid problems such as a foggy image.

Abstract: An image forming apparatus and an image forming method for preventing reducing of density of an image transferred to the recording paper due to dropping in a temperature, without providing a temperature sensor. The current detecting unit detects an electric current value generated at the time a test voltage is applied to a transferring member which is provided for transferring a developed image on a photoconductive drum to the paper. The detected current value is input and stored by a printer controller. The printer controller determines an exposure time, based on the stored current value, by reference to a table for determining an exposure time. The printer controller causes the exposure time to be long when the stored current value is small or large.

Abstract: An image forming apparatus and an image forming method for preventing reducing of density of an image transferred to the recording paper due to dropping in a temperature, without providing a temperature sensor. The current detecting unit detects an electric current value generated at the time a test voltage is applied to a transferring member which is provided for transferring a developed image on a photoconductive drum to the paper. The detected current value is input and stored by a printer controller. The printer controller determines an exposure time, based on the stored current value, by reference to a table for determining an exposure time. The printer controller causes the exposure time to be long when the stored current value is small or large.

Abstract: An image recording device for recording an image on a recording sheet including a transfer unit having a transfer roller and photosensitive body. The recording sheet is nipped between the transfer roller and photosensitive body when the image is recorded on the recording sheet. A first resistance value of the transfer unit of when no recording sheet is nipped between the transfer roller and photosensitive body is measured. Then, a second resistance value of the transfer unit of during recording sheet nipping is determined based on the first resistance value. A voltage adjusting mechanism determines a voltage to be applied to the transfer unit based on the second resistance value. A voltage generator generates the determined application voltage and applies it to the transfer roller such that a toner image on the photosensitive body is transferred onto the recording sheet.