JP4715255B2 - Image forming apparatus and program - Google Patents

Description

  The present invention includes an image forming unit that forms an image according to image data on a recording sheet, and a print controller that controls the image forming unit, and the power of the image forming unit shifts from an off state to an on state. The present invention relates to an image forming apparatus that performs initialization processing for a plurality of predetermined items.

  In general, an image forming apparatus performs image forming processing and detects whether or not there is an error in each function of the hardware resources and software resources of the apparatus. Examples of the error include a recording sheet conveyance abnormality and a formed image density abnormality.

  Regardless of whether an error is detected, if the subsequent processing continues, troubles such as ejection of abnormal images and damage to hardware resources may occur. Therefore, when the occurrence of an error is detected, the subsequent image forming process is often prohibited.

  However, error detection may be a false detection, and in practice both hardware and software resources may be available.

  As a technique for determining whether or not an error is due to erroneous detection as described above, when an error is detected in the image forming apparatus, the image forming apparatus restarts once, and if the error is still not resolved, the image forming apparatus A proposal has been made to make it impossible to use the image forming apparatus for failure (see Patent Document 1).

By the way, the initialization process performed is often the same regardless of the situation. On the other hand, a technique for switching the mode between the normal initialization operation process when the power is turned on and the initialization operation process when returning from the energy saving mode has been proposed (see Patent Document 2).
Japanese Patent Laid-Open No. 2-105167 JP 2000-196789 A

  However, when the image forming apparatus is restarted because an error in the image forming apparatus is detected as in the technique described in Patent Document 1, the image forming apparatus is further damaged by the initialization process at the time of restarting. There was a case.

  In recent years, multi-function machines having FAX, copiers, scanners, and printer functions, which have become mainstream in recent years, send and receive data between an image forming unit that forms images on recording paper and the outside, and print data. It consists of a controller. In such a multifunction device, when an error is detected in the image forming unit and the use of the image forming unit must be disabled, the image including the print controller can be used regardless of whether the function of the print controller can be used. All functions of the forming device have been disabled.

In consideration of the above facts, the present invention minimizes the damage to the image forming apparatus due to the initialization process at the time of restart when an error occurs in the image forming apparatus and the recovery is measured by restarting. An object of the present invention is to obtain an image forming apparatus and a program that can extend the life and reduce so-called downtime such as interruption of processing.

According to a first aspect of the present invention, there is provided an image forming apparatus comprising: an image forming unit that forms an image according to image data on a recording sheet; and a print controller unit that controls the image forming unit. A developer remaining amount detection sensor for detecting the remaining amount of developer used for forming, and an error storage for storing error information indicating the error when an error occurs during activation or operation of the image forming unit Means, an initialization storage means storing initialization processing information indicating initialization processing that can be performed for each error information, and initialization processing of the image forming unit, and provided in the image forming unit, the error Notification means for notifying the error information to the print controller section when the error occurs, wherein the print controller section notifies the error information notified by the notification means. Determining means for determining whether or not the error indicated by the error information is resolved when the initialization process indicated by the corresponding initialization processing information is performed, and determining that the error is not resolved by the determining means The image forming unit is instructed to shut down, and the image forming unit is instructed to restart when the determination unit determines that the error is resolved. forming unit, shutdown means for executing a shutdown if the shutdown is instructed by said instruction means, and restart is instructed by said instructing means, the initialization information stored prior Symbol initialization storage means latest error information the stored in the error storage means out represents the detection incompetence of the developer remaining amount detecting sensor If there was an error information indicating the error, as the initialization processing shown by initialization information corresponding to the error information, so that the concentration adjusting process of the image despite the remaining amount of the developer is too small it is not performed And an initialization processing execution means for performing initialization other than the density adjustment processing at the time of subsequent restart .

  Thus, according to the first aspect of the present invention, when the restart is performed, the initialization process to be executed is selected according to the error that has occurred in the image forming unit that occurred before the restart. Depending on the error that has occurred, the image forming apparatus may be damaged by the execution of the initialization process of a specific item, but by not selecting the initialization process of a specific item as in the present invention, Damage to the image forming apparatus can be minimized.

According to the second aspect of the present invention, when an error occurs during activation or operation of an image forming unit that forms an image corresponding to image data on a recording sheet, error information indicating the error is stored in an error storage unit. Means for controlling the image forming unit, provided in the image forming unit, and a notification unit for notifying the error information to a print controller unit for controlling the image forming unit when the error occurs, initialization of the image forming unit The initialization processing information stored in the initialization storage means storing initialization processing information indicating initialization processing that can be performed for each error information, and the error notified by the notification means A determination method for determining whether or not the error indicated by the error information is resolved when the initialization process indicated by the initialization process information corresponding to the information is performed. When the determination unit determines that the error is not resolved, the image forming unit is instructed to shut down, and when the determination unit determines that the error is resolved, the image forming unit is re-executed. Instruction means for instructing activation,
Shutdown means for executing a shutdown if the shutdown is instructed by said instruction means, and said error of said restarted by instructing means is instructed, initializing process information stored prior Symbol initialization storage means The latest error information stored in the storage means is error information indicating an error indicating a lack of detection capability of a developer remaining amount detection sensor for detecting the remaining amount of developer used to form an image on the recording sheet. If there is, the initialization process indicated by the initialization process information corresponding to the error information is other than the density adjustment process so that the image density adjustment process is not performed even though the remaining amount of the developer is too small. This is a program for functioning as initialization processing execution means for executing the initialization processing at the time of subsequent restart .

  As described above, according to the present invention, when an error occurs in the image forming apparatus and recovery is measured by restarting, the damage to the image forming apparatus due to initialization processing at the time of restarting is minimized, and It has an excellent effect of obtaining an image forming apparatus that can extend the life and reduce so-called downtime such as interruption of processing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, an image forming apparatus 10 according to an embodiment of the present invention is connected to an external apparatus such as a client PC 90 that transmits an image forming job.

  The image forming apparatus 10 records an image corresponding to the input image data, and a print controller 12 that instructs execution of the printing process by using image data that has undergone various processes such as image processing based on image information such as a print job. It consists of an IOT 14 that prints on paper.

  The image forming apparatus 10 according to the present embodiment has a configuration in which the print controller 12 and the IOT 14 are integrated. However, the print controller 12 and the IOT 14 may be physically independent.

  FIG. 2 shows the internal configuration of the IOT 14. In the IOT 14, photoconductors 20Y, 20M, 20C, and 20K that rotate in the direction of arrow A for each color of yellow, magenta, cyan, and black are arranged in parallel facing the intermediate transfer belt 30, and the intermediate transfer belt 30 makes one round. This is a so-called tandem full color IOT in which toner images of four colors are superimposed. Note that when distinguishing each color of yellow, magenta, cyan, and black, Y, M, C, and K are added after the code. However, if there is no need to distinguish each color, Y, M, C, and K are omitted.

  A charging roll 22 that uniformly charges the surface of the photoconductor 20 is in contact with the surface of the photoconductor 20. A laser exposure device 24 for irradiating a light beam for writing an electrostatic latent image on the surface of the photoconductor 20 is disposed on the downstream side of the charging roller 22 in the rotation direction of the photoconductor 20. Further, a developing device 26 for developing the electrostatic latent image into a toner image is in contact with the downstream side of the laser exposure device 24.

  An intermediate transfer belt 30 is in contact with the developing device 26 on the downstream side in the rotation direction of the photoconductor 20.

  The intermediate transfer belt 30 is wound around belt conveyance rolls 32A, 32B, 32C, and 32D so as to come into contact with the surface of the photoreceptor 20, and is rotated in the arrow B direction. A primary transfer roll 28 is disposed at a portion where the intermediate transfer belt 30 and the photoconductor 20 abut. The primary transfer roll 28 has a polarity opposite to the charging polarity of the toner image formed on the photoconductor 20. A voltage is applied to the intermediate transfer belt 30, and a toner image is electrostatically attracted from the photoconductor 20 to the intermediate transfer belt 30 for primary transfer.

  The IOT 14 includes a paper feed tray 34 at the bottom. The recording paper P set in the paper feed tray 34 is fed one by one from the paper feed tray 34 to the downstream side in the transport direction in the direction of arrow C and transported to the transfer unit 36.

  The transfer unit 36 is provided with a belt conveyance roll 32B around which the intermediate transfer belt 30 is wound, and a secondary transfer roll 36B pressed against the belt conveyance roll 32B. The secondary transfer roll 36B rotates in the arrow D direction. The intermediate transfer belt 30 is sandwiched between the nip portion of the belt conveyance roll 32B and the secondary transfer roll 36B, and the toner image is transferred from the intermediate transfer belt 30 when the recording paper P passes through the nip portion. It is like that.

  A fixing unit 38 is disposed downstream of the transfer unit 36 in the transport direction. The fixing unit 38 is provided with a heat roll 38A that becomes high temperature and a backup roll 38B that is pressed against the heat roll 38A, and the recording paper P has a nip portion between the heat roll 38A and the backup roll 38B. When passing, the toner is melted and solidified to be fixed on the recording paper P. The recording paper P is discharged by a paper discharge roll (not shown) disposed on the downstream side in the transport direction of the fixing unit 38.

  A density sensor 42 for detecting the density of the toner image formed on the intermediate transfer belt 30 and a color register for each color toner image are provided on the downstream side of the photoconductor 20K and the upstream side of the transfer unit 36. A color registration detection sensor 40 for detection is provided.

  Further, the IOT 14 includes a toner tank 44 that stores toner of each color used by the developing device 26 of each color. The toner tank 44 for each color and the developing device 22 for each color corresponding to the toner tank 44 are connected by a toner feeding pipe (not shown). The toner tank 44 for each color supplies the toner for each color to the developing device 22 for each color. It is supposed to be.

  By the way, when the power of the IOT 14 is turned on, the above-described initialization processing of each device included in the IOT 14 is performed.

  The initialization processing includes a plurality of processing items such as determination of whether or not toner is supplied to the toner tank 44, color registration adjustment processing, and density adjustment processing. By such initialization processing, each function related to image formation is prepared to function normally.

  Next, the functional configuration of the image forming apparatus 10 according to the present embodiment will be described with reference to FIG.

  The print controller 12 is provided with a main power switch 50 for the user to instruct the power on or off of the image forming apparatus 10. The main power switch 50 is connected to a controller power on / off control unit 52. The controller power on / off control unit 52 receives a power on instruction or a power off instruction from the main power switch 50, and The power supply is turned on and off.

  The controller power on / off controller 52 is connected to a controller initialization controller 54. The controller power on / off controller 52 first transmits a start signal to the controller initialization controller 54 when the print controller 12 is turned on. When the controller initialization control unit 54 receives the start signal, the controller initialization control unit 54 executes an initialization process for enabling the functions of the print controller 12.

  In addition, the print controller 12 includes a print processing control unit 56 that controls the operation of the print controller 12 itself and instructs the operation of the IOT 14. The print processing control unit 56 transmits / receives data to / from an external device 90 such as a client PC via an interface (I / F) unit 58. Further, the instruction data from the print processing control unit 56 to the IOT 14 is transmitted to the IOT control unit 14C via the controller I / O unit 60 and the IOTI / O unit 62 provided in the IOT 14.

  By the way, the main power switch 50 is also connected to the controller I / O unit 60, and an instruction to the main power switch 50 is turned on / off of the IOT power via the controller I / O unit 60 and the IOTI / O unit 62. The data is transmitted to the control unit 64. The IOT power on / off control unit 64 controls the power on / off of the IOT 14. The IOT power on / off control unit 64 is connected to an IOT initialization control unit 66 that controls initialization processing that enables the functions of the IOT 14 to be executed. The IOT initialization control unit 66 starts to execute the initialization process when it receives the information on the transition to the on state from the IOT power on / off control unit 64.

  Incidentally, a fatal error in the processing operation of the IOT control unit 14C is detected by the IOT error detection unit 68. The IOT error detection unit 68 is connected to an error storage unit 70 that stores error information in the IOT 14, and the detected error is transmitted to the error storage unit 70. The error storage unit 70 stores the error occurrence date and time together with the received error information. The error storage unit 70 is a non-volatile memory, and the stored error information is not lost even when the power of the image forming apparatus 10 is turned off.

  On the other hand, the IOT error detection unit 68 is also connected to an error determination unit 72 provided in the print controller 12 via the IOTI / O unit 62 and the controller I / O unit 60. When receiving the error information, the error determination unit 72 instructs the IOT power on / off control unit 64 to restart via the controller I / O unit 60 and the IOTI / O unit 62.

  As an error recovered by restarting, for example, there is an error in detecting the remaining amount of toner in the toner tank 44. For example, when a large amount of solid black image is formed, the toner (K) in the toner tank 44K decreases rapidly. A toner remaining amount detection sensor (not shown) detects the remaining amount of toner (K) in the toner tank 44K, and prompts the supply of toner (K) to the toner tank 44K when the remaining amount becomes smaller than a predetermined remaining amount. However, if the toner (K) decreases too rapidly, the detection capability cannot catch up and a sensor error occurs. In such a case, the detection of the remaining toner detection sensor can be returned to normal by restarting the apparatus. The toner remaining amount detection sensor after the restart detects the remaining amount of toner (K) in the toner tank 44K that has decreased, and prompts the supply of toner (K) to the toner tank 44K.

  By the way, the IOT 14 includes an IOT power switch 76 for the user to instruct to turn on or off the power of only the IOT 14. Normally, the power on / off of the IOT 14 is controlled by an instruction to the main power switch 50. For example, when only the IOT 14 is restarted by a user's judgment instead of an instruction from the error judgment unit 72, etc. In addition, the operation to the IOT power switch 76 is performed.

  The IOT power switch 76 via the error determination unit 72, the main power switch 50, the controller I / O unit 60, and the IOTI / O unit 62 indicates whether the power on of the IOT 14 is a normal power on or a power on in a restart. Is also connected to the restart identification unit 74 for identifying Basically, when the restart identification unit 74 receives a restart instruction from the error determination unit 72, the restart identification unit 74 determines that the power is turned on in the restart, and turns on the power from the main power switch 50 or the IOT power switch 76. When the instruction is received, it is determined that the power is normally on. On the other hand, the restart identification unit 74 also receives a power-off instruction from the main power switch 50 or the IOT power switch 76, and measures the time from the power-off instruction to the power-on instruction. When the time is within the predetermined time, even if a power-on instruction is issued from the main power switch 50 or the IOT power switch 76, the power-on is identified as a restart.

  In addition, the error determination unit 72 transmits an instruction to prohibit all initialization processing to the restart identification unit 74 so that the IOT 14 cannot perform processing depending on the type of error information.

  For example, an error detected when a part of a part included in the IOT 14 is damaged can be recovered only by replacing the damaged part. If it is not possible to recover from an error even after such a restart and initialization process, the initialization process after the restart is not performed and the use of the IOT 14 is disabled. .

  Further, the restart identification unit 74 is connected to the IOT initialization control unit 66 via the controller I / O unit 60 and the IOTI / O unit 62. In synchronization with the IOT power on / off control unit 64 transmitting information indicating that the power has been turned on to the IOT initialization control unit 66, the restart identification unit 74 notifies the IOT initialization control unit 66 of the on state. Information on whether or not the transition to the restart is restarted and information on whether or not the initialization process can be executed are transmitted.

  The error determination unit 72 instructs the restart identification unit 74 to prohibit all initialization processing, and does not disable the IOT 14, but instructs the IOT power on / off control unit 64 to shut down and restart. It may be prohibited and the IOT 14 may be disabled.

  By the way, some initialization processes may cause problems such as damage to the apparatus when restarted when an error occurs.

  For example, when restarting after occurrence of the sensor error described above, density adjustment, which is one of the initialization processes, is performed regardless of whether the remaining amount of toner (K) is too small. Then, other functions such as exposure amount have been adjusted in order to obtain a normal density with a small amount of toner (K). Thus, there is a problem that unnecessary adjustment operation is performed and carrier outflow is promoted. As described above, when the above-described sensor error occurs, it is necessary not to perform density adjustment in the subsequent restart.

  On the other hand, the IOT initialization control unit 66 is connected to an initialization menu selection unit 78 for selecting an item for initialization processing. It prompts you for possible initialization choices.

  The initialization menu selection unit 78 is connected to the error storage unit 70 and the initialization menu storage unit 80. Error information is received from the error storage unit 70, and initialization menu information is received from the initialization menu storage unit 80. And an item of initialization processing that can be performed is selected based on the error information.

  For example, the initialization menu selection unit 78 may input / output between the print controller 12 and the IOT 14 in order to prohibit input / output processing between the print controller 12 and the IOT 14 depending on the type of error information stored in the error storage unit 70. Do not select items for initialization processing.

  As described above, the image forming apparatus 10 having the configuration of the present embodiment is initialized without any problem even if it is executed by excluding the initialization process that causes a problem or does not require initialization from the error information. Only the process can be performed, and the apparatus is not damaged by the initialization process.

  Next, the operation of this embodiment will be described with reference to the flowcharts shown in FIGS.

  FIG. 4 shows a processing flow of the IOT 14.

  First, in step 100, the IOT power source is turned on. Subsequently, the process proceeds to step 102. In step 102, an initialization process described later is performed.

  Subsequently, in step 104, it is determined whether or not the IOT power is turned off. (The IOT power-off here is not the power-off at the time of restart, but the power-off at the time of shutdown.) When the power is off, the processing of the ITO 14 ends.

  If the IOT power is not off in step 104, the process proceeds to step 106. In step 106, it is determined whether an error is detected by the IOT control unit 14C. If no error is detected, the process returns to step 104 again.

  If an error is detected in step 106, the process proceeds to step 108. In step 108, an error occurrence process described later is performed. After the error occurrence process, the process returns to step 104 again.

  FIG. 5 shows a flow of error determination processing.

  First, in step 110, error information is stored in the error storage unit 70. Subsequently, in step 112, error information is notified to the error determination unit 72. After the error information is notified to the error determination unit 72, the process proceeds to step 114 and waits for a determination instruction from the print controller 12.

  When a determination instruction is issued from the print controller 12, the process proceeds to step 116. In step 116, the IOT 14 is restarted by an instruction from the error determination unit 72. After the IOT 14 is turned on, the process proceeds to step 118. In step 118, initialization processing described later is performed.

  FIG. 6 shows a flow of initialization processing in the IOT 14.

  First, in step 120, information indicating whether or not the current transition to the ON state in the IOT 14 is due to restart is transmitted from the restart identification unit 74. If it is a restart, the process proceeds to step 122. In step 122, it is determined whether or not the initialization process is prohibited. If not prohibited, the process proceeds to step 124. In step 124, the error storage unit 70 is referred to and it is determined whether or not an error has occurred before restarting. If an error has occurred, the process proceeds to step 126. In step 126, the initialization menu selection unit 78 determines whether or not all of the initialization processes stored in the initialization menu storage unit 80 can be performed. If not feasible, the process proceeds to step 128. In step 128, the initialization menu selection unit 78 selects an executable initialization process. Subsequently, the process proceeds to step 140, and the selected initialization process is performed.

  By the way, when it is determined in step 120 that the current transition to the on state is a transition of the power on state in the normal IOT 14, or in step 124, it is determined that no error has occurred before the restart. If it is determined, or if it is determined in step 126 that all of the initialization processes stored in the initialization menu storage unit 80 can be performed, the process proceeds to step 132. In step 132, all of the initialization processes stored in the initialization menu storage unit 80 are performed.

  On the other hand, if it is determined in step 122 that the initialization process is prohibited, no initialization process is performed.

  FIG. 7 shows a processing flow of the print controller 12.

  First, at step 140, the print controller 12 is turned on. Subsequently, the process proceeds to step 142, and the initialization process of the print controller 12 is started. Subsequently, the process proceeds to step 144, where it is confirmed that the power source of the print controller 12 has not shifted to the off state. (The off state here is not the transition to the off state at the time of restart, but the off state at the time of shutdown.) In the off state, the processing of the print controller 12 ends.

  Subsequently, the process proceeds to step 146, where it is determined whether an error is detected during the process of the print controller 12 including the initialization process. When an error is detected in the print controller 12, restart is performed. First, the process proceeds to step 148, the print controller power is turned off, and the process returns to step 140 described above.

  In subsequent step 150, it is determined whether or not the error determination unit 72 has received error information in the ITO 14. If received, the process proceeds to step 152. In step 152, a determination process described later is performed. During the processing of step 152, the IOT 14 waits for a determination instruction from the print controller 12.

  When step 152 ends, the process proceeds to step 154. In step 154, it is determined whether or not the initialization process is being performed in the IOT 14. If it is determined that the operation is not in progress, the process returns to step 144 described above.

  FIG. 8 shows a flow in the print controller 12 when error information is received.

  First, in step 160, the error determination unit 72 determines whether or not to execute the initialization process after restarting the standby IOT 14. If not, the process proceeds to step 162. In step 162, the error determination unit 72 instructs the restart identification unit 74 to prohibit initialization processing. Subsequently, in step 164, the error determination unit 72 instructs the IOT power on / off control unit 64 to restart.

  In this embodiment, the IOT 14 notifies the print controller 12 of an error, the print controller 12 determines the error content, and instructs the IOT 14 to restart, but the IOT 14 determines the error content. The printer may be restarted and the print controller 12 may be notified of the restart.

  In this embodiment, the error storage unit 70 is provided in the IOT 14. However, the error storage unit is provided in the print controller 12, and the IOT 14 exchanges error contents with the print controller 12 when an error occurs and when it is restarted. It is good.

1 is an external view of an image forming apparatus according to an embodiment. It is the schematic which shows the internal structure of IOT of this Embodiment. 2 is a block diagram showing functional connections of the image forming apparatus according to the present embodiment. FIG. It is a flowchart of the process in IOT of this Embodiment. It is a flowchart of the process in IOT at the time of error occurrence. It is a flowchart of the initialization process in IOT. 6 is a flowchart of processing in the print controller of the present embodiment. 6 is a flowchart of processing in a print controller when an error occurs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Print controller (print controller part)
14 IOT (image forming unit)
50 Main power switch 60 Controller I / O unit 62 IOTI / O unit 64 IOT power on / off control unit 66 IOT initialization control unit 68 Error detection unit 70 Error storage unit (storage means)
72 Error determination unit 74 Restart identification unit (identification means)
76 IOT power switch (power switch)
78 Initialization menu selection section

Claims (2)

An image forming apparatus comprising: an image forming unit that forms an image according to image data on a recording sheet; and a print controller unit that controls the image forming unit.
A developer remaining amount detection sensor for detecting the remaining amount of developer used to form an image on the recording paper;
An error storage means for storing error information indicating the error when an error occurs during activation or operation of the image forming unit;
Initialization storage means for storing initialization processing information indicating initialization processing that can be performed for each error information as initialization processing of the image forming unit;
A notification unit provided in the image forming unit and notifying the error information to the print controller unit when the error occurs;
Whether or not the error indicated by the error information is resolved when the initialization process indicated by the initialization process information corresponding to the error information notified by the notification unit is performed by the print controller unit A determination unit that determines whether the error is not resolved by the determination unit, and instructs the image forming unit to shut down, and the image when the determination unit determines that the error is resolved Instructing means for instructing the forming unit to restart,
The image forming unit, said shutdown means for executing a shutdown if the shutdown is instructed by the instruction means, and the restarted by instructing means is instructed, before Symbol initialization stored in the initialized memory means If the latest error information stored in the error storage means of the information is error information indicating an error indicating a lack of detection capability of the developer remaining amount detection sensor, an initialization process corresponding to the error information As initialization processing indicated by the information , initialization processing other than the density adjustment processing is performed at the subsequent restart so that the image density adjustment processing is not performed even though the remaining amount of developer is too small. An image forming apparatus comprising an initialization processing execution unit.   Computer
  Means for controlling error information indicating the error to be stored in an error storage means when an error occurs during activation or operation of an image forming unit that forms an image according to image data on a recording sheet;
  A notifying unit provided in the image forming unit and notifying the error information to a print controller that controls the image forming unit when the error occurs;
  The initialization processing information stored in an initialization storage means storing initialization processing information indicating initialization processing that can be performed for each error information, which is initialization processing of the image forming unit, and the notification Determining means for determining whether or not the error indicated by the error information is resolved when the initialization process indicated by the initialization process information corresponding to the error information notified by the means is performed;
  When the determination unit determines that the error is not resolved, the image forming unit is instructed to shut down. When the determination unit determines that the error is resolved, the image forming unit is restarted. Instruction means for instructing,
  Shutdown execution means for performing shutdown when shutdown is instructed by the instruction means; and
  Reboot is instructed by the instruction unit, and the latest error information stored in the error storage unit among the initialization processing information stored in the initialization storage unit forms an image on the recording sheet. In the case of error information indicating an error indicating a lack of detection capability of the developer remaining amount detection sensor for detecting the remaining amount of developer used in the process, the initialization process indicated by the initialization process information corresponding to the error information Also, it functions as an initialization processing execution means for performing initialization processing other than the density adjustment processing at the subsequent restart so that the image density adjustment processing is not performed even though the remaining amount of developer is too small. Program to let you.

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