A plurality of sub control circuits are connected to respective ones of a plurality of head units. One of the plurality of sub control circuits is connected to a main control circuit so as to perform communication. The plurality of sub control circuits include a first control circuit and a second control circuit. The second control circuit is connected to the first control circuit in series so as to perform communication. The first control circuit is configured to: receive first data, the first data including a first parameter and a second parameter, the first parameter corresponding to the first control circuit, the second parameter corresponding to the second control circuit; and transmit the first data to the second control circuit. The second control circuit is configured to: receive the first data from the first control circuit; and delete the first parameter from the first data.

An image forming apparatus includes a rotatable image bearer, a transfer rotator, a detector, and circuitry. The image bearer bears an image. The transfer rotator transfers the image from the image bearer onto a recording medium sandwiched and conveyed between the image bearer and the transfer rotator. The detector detects length information indicating a length, in a direction of conveyance of the recording medium, of the image on the recording medium. The circuitry corrects a correction value, based on the length information detected by the detector and a target value of the length information, to correct an image magnification, in the direction of conveyance of the recording medium, of the image to be formed on the recording medium. The circuitry controls an image forming operation of forming the image on the recording medium with the correction value.

An image forming apparatus includes an image forming unit having a photosensitive member, an exposure unit, and a developing unit having a developing sleeve; and a controller configured to acquire read data relating to a first test image, a second test image, and a third test image formed on a same sheet by the image forming unit, and adjust a density in a main scanning direction of an image to be formed by the image forming unit based on the read data. A first interval between the first test image and the second test image is different from a second interval between the second test image and the third test image. Each of the first interval and the second interval is different from an integral multiple of a circumferential length of the photosensitive member, and is different from an integral multiple of a circumferential length of the developing sleeve.

An image forming apparatus includes a display panel, a sheet conveying passage, a reading unit, a light source, a chassis, and a controller. The reading unit includes a light transmitting plate and a conveying image sensor. The conveying image sensor reads a conveyed sheet, which is a sheet to print on. The chassis has a cleaning hole in which to insert a cleaning rod for rubbing the light-transmitting plate. In a maintenance mode, the controller turns on the light source, and makes the display panel display a graph showing the pixel values of the pixels included in conveyed-and-read image data acquired by reading with the conveying image sensor.

An image forming apparatus includes an operation unit that receives an instruction for an operation and executes the operation, and an instruction unit that outputs the instruction to the operation unit. The operation unit includes a configuration storage unit that stores deployment configuration of one or more image forming apparatuses, and an instruction acceptance unit that accepts an instruction for an operation corresponding to the deployment configuration. The instruction unit includes an instruction output unit that receives a designation of an operation, and outputs an instruction for the designated operation to the operation unit, and a configuration reporting unit that, if the designated operation does not correspond to a first deployment configuration stored in the configuration storage unit, reports to the operation unit a second deployment configuration to which the designated operation corresponds, and stores the second deployment configuration in the configuration storage unit, before the instruction is output.

An image forming apparatus has a storage portion, a mechanism control portion, and a main control portion. The storage portion stores information as to the apparatus. The mechanism control portion controls the operation of a mechanical system in the apparatus. The main control portion performs a job related to a function of the apparatus by controlling the operation of individual constituent elements of the apparatus, and on detecting an error that prevents continuation of the operation of the mechanical system included in the job being performed, feeds the mechanism control portion with an instruction to interrupt the control of the operation of the mechanical system, stores in the storage portion uncompleted data of the job corresponding to the operation of the mechanism control portion left uncompleted as a result of the interruption, reboots itself, and restarts the job by using the uncompleted data.

The disclosure is directed towards a system and method for using a multicore processor to process a printer definition language (PDL). The system improves efficiency by supporting parallel processing of many commonly used PDLs, while also supporting serial processing of many legacy PDLs. When processing a PDL, the system relies on several stages, including a parsing stage, a printer drawings services stage, and a graphic services stage, which includes order generation. The system provides flexibility by permitting function calls of common PDLs to be either asynchronous requests or blocking synchronous requests. Because legacy PDLs are executed serially, legacy PDL requests are considered to be blocking synchronous requests. The system provides a level of abstraction at the PDL level by allowing multiple requests to be combined into a compound asynchronous request. The system also improves accuracy by notifying the original caller of a request about an error during error handling.

Provided is an image forming apparatus that enables use in a state even in a case where failure happens in a first storage device. The first storage device has a plurality of partitions that store data for each various function in connection with image formation. A second storage device stores an application program for executing the various function in about image formation. The second storage device has the same partition as the partition of the first storage device. A control part performs mounting process for each partition of the first storage device at the time of a start process. Next, the control part reads the application program in the second storage device. Also, control part performs mounting process for the same partition of the second storage device as the failed partition when the mounting process either of partitions fails.

An image forming apparatus includes an HDD, an HDD confirming unit, a system control unit, and a non-volatile semiconductor storage device. The HDD confirming unit detects a failure of the HDD and, in situations where a failure is detected, executes a confirmation process of detecting any operable portion of the HDD. The non-volatile semiconductor storage device stores system data used for operation of the system control unit. In a failure of the HDD, when the HDD confirming unit does not detect any operable portion, the system control unit separates the HDD from the image forming apparatus and sets the image forming apparatus into a restriction mode. In a failure of the HDD, when the HDD confirming unit detects an operable portion, the system control unit does not separate the HDD from the image forming apparatus and sets the image forming apparatus into a small-capacity mode.

Disclosed herein are a system, non-transitory readable medium, and method to manage license to use agreements. The maximum number of credits a device is allowed to consume is determined. An attacker resistant counter is increased using an atomic write.