JP6558295B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an electrophotographic image forming apparatus.

  Generally, when an image forming process is executed in an electrophotographic image forming apparatus, a plurality of images such as a charging voltage, a DC (Direct Current) developing bias voltage, an AC (Alternating Current) developing bias voltage, and a transfer voltage are formed. The parameter is set.

  Further, in the image forming apparatus, the difference between the surface potential of the photoconductor and the developing bias voltage is changed, so that the image forming process is performed in a situation where an image abnormality due to the charging unit is likely to occur. Is known (see, for example, Patent Document 1). The purpose of this is to prevent the occurrence of image abnormalities due to poor charging of the photoreceptor.

JP 2008-170549 A

  By the way, when any abnormality of the plurality of imaging parameters occurs, it is determined which of the plurality of imaging parameters is abnormal, and replacement or repair of a part corresponding to the abnormal imaging parameter is performed. It is necessary to do.

  However, it is difficult for a user without expertise to determine the abnormal imaging parameter. In addition, when a repairman operates the image forming apparatus to determine an abnormal image forming parameter, the repairman is required to identify parts to be prepared in advance and to replace or repair a failed part. Tends to cause inefficiencies that require multiple visits to the user.

  An object of the present invention is to provide an image forming apparatus that can easily determine which of the plurality of imaging parameters is abnormal when any of the plurality of imaging parameters is abnormal. It is in.

  An image forming apparatus according to one aspect of the present invention includes an image forming unit, a test mode setting unit, and an image forming control unit. The image forming unit executes an image forming process for forming an image on a sheet. The test mode setting unit can set a test mode different from the standard mode in the initial state as the mode of the image forming process. When the test mode is set, the image formation control unit causes the image forming unit to execute the image forming process of a test image determined in advance under a plurality of image forming conditions. The plurality of image forming conditions include standard image forming conditions and test image forming conditions. The standard imaging condition is a condition in which all of a plurality of predetermined imaging parameters are set to a standard state adopted in the standard mode. The plurality of test imaging conditions are a plurality of conditions in which some of the plurality of imaging parameters are set to a test state different from the standard state and all the remaining are set to the standard state. The plurality of image forming parameters include a part or all of a charging voltage, a DC developing bias voltage, an AC developing bias voltage, and a transfer voltage. The charging voltage is a voltage applied to a charging unit that charges a photoconductor on which an electrostatic latent image is written. The DC developing bias voltage is a DC voltage applied between the photosensitive member and a developing unit that develops the electrostatic latent image on the surface of the photosensitive member into a toner image. The AC developing bias voltage is an AC voltage applied between the photoconductor and the developing unit. The transfer voltage is a voltage applied to a transfer unit that transfers the toner image on the surface of the photoconductor to the sheet. The test states of the charging voltage, the DC developing bias voltage, the AC developing bias voltage, and the transfer voltage are states in which no voltage is applied.

  According to the present invention, it is possible to provide an image forming apparatus that can easily determine which of the plurality of imaging parameters is abnormal when any of the plurality of imaging parameters is abnormal. Is possible.

FIG. 1 is a configuration diagram of an image forming apparatus according to an embodiment. FIG. 2 is a configuration diagram of a scanner included in the image forming apparatus according to the embodiment. FIG. 3 is a block diagram of a control-related unit in the image forming apparatus according to the embodiment. FIG. 4 is a diagram illustrating an example of a test mode image formed on a sheet in the test mode by the image forming apparatus according to the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the following embodiment is an example which actualized this invention, Comprising: It does not have the character which limits the technical scope of this invention.

[Configuration of Image Forming Apparatus 10]
First, a schematic configuration of the image forming apparatus 10 according to the embodiment will be described with reference to FIGS.

  The image forming apparatus 10 includes an image forming unit 40 that executes an image forming process using an electrophotographic method. The image forming process is a process of forming an image on the sheet 9X. The sheet 9X is a sheet-like image forming medium such as paper and an OHP sheet.

  As shown in FIG. 1, the image forming apparatus 10 includes a main body unit 1 including an image forming unit 40 and a scanner 2. Further, the image forming apparatus 10 includes a sheet conveyance unit 3 and a control unit 8 in the main body unit 1. An operation display unit 80 is incorporated in the scanner 2. The image forming unit 40 includes an image forming unit 4.

  The image forming unit 40 shown in FIG. 1 is a tandem type color image forming apparatus capable of forming images of a plurality of colors on the sheet 9X. Therefore, the image forming unit 40 includes four image forming units 4 corresponding to four colors of cyan, magenta, yellow, and black, respectively. Further, the image forming apparatus 10 includes an intermediate transfer belt 47, a secondary transfer unit 48, and a secondary cleaning unit 470.

  The sheet conveying section 3 sends out the sheets 9X stored in the sheet cassette 3X one by one to the sheet conveying path 300, conveys the sheets 9X along the sheet conveying path 300, and discharges them to the sheet discharge tray 101.

  In each of the image forming units 4, the drum-shaped photoconductor 41 rotates, and the charging unit 42 uniformly charges the surface of the photoconductor 41. Further, the optical scanning unit 46 writes an electrostatic latent image on the surface of the photoreceptor 41, and the developing unit 43 develops the electrostatic latent image on the surface of the photoreceptor 41 into a toner image.

  Further, in each of the image forming units 4, the primary transfer unit 44 transfers the toner image from the surface of the photoreceptor 41 to the intermediate transfer belt 47. The primary cleaning unit 45 removes the toner remaining on the surface of the photoreceptor 41.

  The secondary transfer unit 48 transfers the toner image formed on the intermediate transfer belt 47 to the sheet 9 </ b> X that is moving through the sheet conveyance path 300. The secondary cleaning unit 470 removes the toner remaining on the intermediate transfer belt 47.

  The fixing unit 49 heats the toner image transferred to the sheet 9X in the sheet conveyance path 300, and fixes the toner image to the sheet 9X.

  The scanner 2 is an example of an image reading unit that executes an image reading process of reading an image from the document 9Y and outputting data of the document image Im00.

  As shown in FIG. 2, the scanner 2 includes a document scanning unit 11 and a document table cover 12. The document table cover 12 is supported so as to be rotatable with respect to the document scanning unit 11. The document scanning unit 11 includes a transparent document table 16 and a contact portion 160 that form the upper surface of the document scanning unit 11, and the document table cover 12 covers the upper surface of the document table 16.

  In the document scanning unit 11, the scanning mechanism 110 moves the image sensor 13 along the document table 16, and the image sensor 13 reads an image from the document 9Y on the document table 16 and outputs data of the document image Im00.

  An ADF (Automatic Document Feeder) 120 incorporated in the document table cover 12 conveys the documents 9Y set on the document supply tray 121 one by one along the document conveyance path 1200 and discharges them to the document discharge tray 122.

  The image sensor 13 reads an image from the document 9Y that is moving on the document conveyance path 1200 while being positioned at the fixed reading position P0 by the scanning mechanism 110, and outputs the data of the document image Im00.

  The control unit 8 is a processor that controls an electrical device included in the image forming apparatus 10. The operation display unit 80 is a man-machine interface device including a display unit including a panel display such as a liquid crystal panel and an operation unit including a touch panel and operation buttons.

  In the image forming apparatus 10, when the image forming process is executed, the control unit 8 sets a plurality of image forming parameters such as a charging voltage, a DC developing bias voltage, an AC developing bias voltage, and a transfer voltage.

  In the following description, the failure of the imaging parameter to be in the state set by the control unit 8 is referred to as an abnormality of the imaging parameter. That is, the state in which the imaging parameter is abnormal is a state in which the device that realizes the imaging parameter according to the setting by the control unit 8 is abnormal.

  By the way, when any abnormality of the plurality of imaging parameters occurs, it is determined which of the plurality of imaging parameters is abnormal, and replacement or repair of a part corresponding to the abnormal imaging parameter is performed. It is necessary to do.

  However, it is difficult for a user without expertise to determine the abnormal imaging parameter. In addition, when a repairman operates the image forming apparatus to determine an abnormal image forming parameter, the repairman returns the user several times to the user in order to replace a faulty part or prepare for repair. Inefficient situations that must be visited are likely to occur.

  The control unit 8 of the image forming apparatus 10 includes a test mode function for easily determining which of the plurality of image forming parameters is abnormal.

  In the present embodiment, the plurality of image forming parameters are the charging voltage, the DC developing bias voltage, the AC developing bias voltage, and the transfer voltage.

  The charging voltage is a DC voltage applied to the charging unit 42 that charges the photoreceptor 41. The DC developing bias voltage is a DC voltage applied between the photoconductor 41 and the developing unit 43. The AC developing bias voltage is an AC voltage applied between the photoconductor 41 and the developing unit 43.

  The transfer voltage includes a primary transfer voltage applied to the primary transfer unit 44 and a secondary transfer voltage applied to the secondary transfer unit 48. The primary transfer voltage and the secondary transfer voltage are DC voltages. In the present embodiment, the primary transfer unit 44 and the secondary transfer unit 48 are an example of a transfer unit that transfers the toner image on the surface of the photoreceptor 41 to the sheet 9 </ b> X via the intermediate transfer belt 47.

[Configuration of Control Unit 8]
As shown in FIG. 3, the control unit 8 includes a UI (User Interface) control unit 81 that controls the operation display unit 80, an image formation control unit 82 that controls the image forming unit 40, and a scanner control unit that controls the scanner 2. 83, an image processing unit 84, and the like.

  For example, the control unit 8 may be configured by an MPU (microprocessor unit), a DSP (digital signal processor), an ASIC (application specific integrated circuit), or the like.

  The UI control unit 81 includes a test mode setting unit 811 that sets a test mode different from the standard mode in the initial state as the mode of the image forming process in accordance with an operation on the operation unit of the operation display unit 80.

  For example, the test mode setting unit 811 sets the test mode as the mode of the image forming process when a predetermined test mode setting operation is performed on the operation unit, and the standard mode in other cases. Set the mode.

  The standard mode is an operation mode in which the image forming process is executed in response to the occurrence of an image forming job. The image forming job is a job in which target image data is designated each time, and is, for example, a print job or a copy job.

  The print job is a job that the control unit 8 receives from another apparatus through a communication medium (not shown). The copy job is a job for the image forming process based on the data of the document image Im00 output from the scanner 2. The test mode will be described later.

  The image forming apparatus 10 includes a charging voltage applying unit 42X that outputs the charging voltage, a DC developing bias applying unit 43X that outputs the DC developing bias voltage, and an AC developing bias applying unit 43Y that outputs the AC developing bias voltage. A primary transfer voltage application unit 44X that outputs the primary transfer voltage, and a secondary transfer voltage application unit 48X that outputs the secondary transfer voltage.

  In addition, the image forming apparatus 10 includes a drive unit 4X such as a motor and an actuator for driving a rotating body and other mechanisms in the image forming unit 40 and the sheet conveying unit 3. In the image forming process, the image forming control unit 82 controls the rotation of the rotating body such as the photoreceptor 41 and the conveyance of the sheet 9X by controlling the driving unit 4X.

  The image forming control unit 82 causes the image forming unit 40 to execute a test image forming process when the test mode is set. FIG. 4 shows an example of the test mode image Itm0 formed on the sheet 9X by the test image forming process.

  The test image forming process is a process for causing the image forming unit 40 to sequentially execute the image forming process of the test image It0 determined in advance under each of a plurality of image forming conditions. For example, it can be considered that the test image It0 is an image of a fill pattern. The plurality of image forming conditions include one standard image forming condition and a plurality of test image forming conditions.

  The standard imaging conditions are conditions under which all of the plurality of predetermined imaging parameters are set to a standard state. The standard state of each of the plurality of imaging parameters is a voltage and a frequency adopted in the standard mode.

  The standard state of the charging voltage, the DC developing bias voltage, the AC developing bias voltage, the primary transfer voltage, and the secondary transfer voltage are the charging voltage applying unit 42X, the DC developing bias applying unit 43X, and the AC developing bias applying unit. When all of 43Y, the primary transfer voltage application unit 44X, and the secondary transfer voltage application unit 48X are normal, the test image It0 having a predetermined target density is adjusted.

  The standard states of the charging voltage, the DC developing bias voltage, the AC developing bias voltage, and the primary transfer voltage are adjusted for each image forming unit 4, that is, for each of four colors.

  The plurality of test imaging conditions are conditions in which a part of the plurality of imaging parameters is set to a test state different from the standard state and all the rest are set to the standard state.

  In the present embodiment, the test states of the charging voltage, the DC developing bias voltage, the AC developing bias voltage, the primary transfer voltage, and the secondary transfer voltage are states in which no voltage is applied.

  The image forming control unit 82 controls the charging voltage applying unit 42X, the DC developing bias applying unit 43X, the AC developing bias applying unit 43Y, the primary transfer voltage applying unit 44X, and the secondary transfer voltage applying unit 48X, thereby Each imaging parameter is set to the standard state or the test state.

  In the test image forming process, the image forming control unit 82 executes the image forming process of the test mode image Itm0 including the test image It0 and the identification image It2 associated with the test image It0 on the image forming unit 40. Let

  The identification image It2 is an image representing each of the plurality of image forming conditions. In the example shown in FIG. 4, the identification image It2 is formed at a position aligned with the corresponding test image It0 in the main scanning direction D1. That is, the identification image It2 is associated with the test image It0 by the position where it is formed.

  The main scanning direction D1 is a direction along the rotation axis of the photoconductor 41 and is also a direction orthogonal to the moving direction of the sheet 9X in the sheet conveying path 300. Note that the direction perpendicular to the main scanning direction D1, that is, the direction along the moving direction of the sheet 9X in the sheet conveying path 300 is the sub-scanning direction D2.

  It is also conceivable that the test image It0 and the identification image It2 for each image forming condition are associated with each other by adding a common symbol or mark.

  Further, in the test image forming process, the image forming control unit 82 causes the image forming unit 40 to execute the image forming process for the test image It0 under the plurality of image forming conditions for each of the four colors.

  More specifically, in the test image forming process, test images It0 of all four colors are formed on the sheet 9X in a state of being aligned in the main scanning direction D1 for each image forming condition. In the example shown in FIG. 4, a plurality of unit test mode images It1 corresponding to the plurality of image forming conditions are formed on the sheet 9X in a state of being aligned in the sub-scanning direction D2. The plurality of unit test mode images It1 are images in which all four color test images It0 and their corresponding identification images It2 are arranged in the main scanning direction D1.

  In the plurality of unit test mode images It1, a plurality of test images It0 of the same color corresponding to the plurality of image forming conditions are formed side by side in the sub-scanning direction D2 at the same position in the main scanning direction D1.

  In the test image forming process, the image forming control unit 82 causes the image forming unit 40 to execute a process of forming the test mode image Itm0 on one side of one sheet 9X. The test mode image Itm0 is an image including all of the plurality of test images It0 corresponding to the plurality of image forming conditions.

  In the identification image It2 shown in FIG. 4, “NORMAL” (It21) represents the standard imaging condition. Also, “MCK = OFF” (It22), “MCM = OFF” (It23), “MCC = OFF” (It24) and “MCY = OFF” (It25) are black, magenta, cyan and The first test imaging condition in which the application of the charging voltage and the DC developing bias voltage in the yellow toner imaging unit 4 is set to OFF is represented.

  It is also conceivable that the test imaging condition in which the application of the charging voltage is set to OFF and the test imaging condition in which the application of the DC development bias voltage is set to OFF are individually adopted.

  Further, “D_AC K = OFF”, “D_AC M = OFF”, “D_AC C = OFF”, and “D_AC Y = OFF” indicate that the AC development in the image forming unit 4 for black, magenta, cyan, and yellow toners, respectively. The second test imaging condition in which the application of the bias voltage is set to OFF is represented.

  Further, “T1 K = OFF”, “T1 M = OFF”, “T1 C = OFF”, and “T2 Y = OFF” indicate the primary transfer in the image forming unit 4 of black, magenta, cyan, and yellow toners, respectively. A third test imaging condition in which voltage application is set to OFF is represented. Further, “T2 = OFF” represents the fifth test imaging condition in which the application of the secondary transfer voltage is set to OFF.

  In the following description, the test image It0 corresponding to the standard imaging condition, that is, the test image It0 formed by the image forming process under the standard imaging condition is referred to as a standard test image It0a. A test image It0 corresponding to each of the test imaging conditions, that is, a test image It0 formed by the image forming process under each of the standard imaging conditions is referred to as a comparative test image It0b.

  When the charging voltage application unit 42X or the DC development bias application unit 43X is abnormal, the standard test image It0a is an image that approximates the comparison test image It0b when the application of the charging voltage and the DC development bias voltage is OFF. become.

  When the AC development bias application unit 43Y is abnormal, the standard test image It0a is an image that approximates the comparison test image It0b when the application of the AC development bias voltage is OFF.

  When the primary transfer voltage application unit 44X is abnormal, the standard test image It0a is an image that approximates the comparison test image It0b when the application of the primary transfer voltage is OFF.

  Similarly, when the secondary transfer voltage application unit 48X is abnormal, the standard test image It0a is an image that approximates the comparison test image It0b when the application of the secondary transfer voltage is OFF.

  Therefore, it is possible to easily identify the failed component by determining which of the remaining plurality of comparison test images It0b is the standard test image It0a in the test mode image Itm0.

  When the user notices a defect in the image formed on the sheet 9X by the image forming apparatus 10 in the standard mode, the user performs the test mode setting operation for the operation on the operation display unit 80. As a result, the image forming apparatus 10 executes the test image forming process and forms a test mode image Itm0 as shown in FIG. 4 on the sheet 9X.

  The user can easily visually determine which of the plurality of remaining comparative test images It0b is the standard test image It0a in the output test mode image Itm0.

  In the following description, determining which standard test image It0a in the test mode image Itm0 is closest to among the remaining plurality of comparison test images It0b is referred to as approximate test image determination. The comparison test image It0b that is closest to the standard test image It0a is referred to as an approximate test image.

  In the present embodiment, a plurality of identification images It2 associated with a plurality of test images It0 are included in the test mode image Itm0. Therefore, the test imaging conditions corresponding to the approximate test image can be easily specified.

  Furthermore, if the user informs the service center of the image forming apparatus 10 of the result of the approximate test image determination, the parts to be replaced or repaired can be arranged before the repair person goes to the site.

  Therefore, it is possible to avoid an inefficient situation in which the repairman visits the user a plurality of times.

  It is also conceivable that the image forming apparatus 10 has a function of executing the approximate test image determination process. In the following description, when the sheet 9X on which the test mode image Itm0 including the test image It0 is formed is set on the document table 16 or the document supply tray 121 as the document 9Y, the document 9Y is referred to as a test document.

  In the present embodiment, the UI control unit 81 includes an abnormality determination mode setting unit 812 that sets an abnormality determination mode as a mode of the image forming process in accordance with an operation on the operation unit of the operation display unit 80. The abnormality determination mode is an operation mode in which the test document is an object of the image reading process.

  When the abnormality determination mode is set, the scanner control unit 83 causes the scanner 2 to execute the image reading process. Thereby, the data of the original image corresponding to the test original is obtained. The scanner control unit 83 is an example of an image reading control unit.

  Further, the image processing unit 84 performs an abnormal parameter determination process by performing image processing on the document image data corresponding to the test document. The document image corresponding to the test document is a test mode image Itm0 (see FIG. 4).

  The abnormal parameter determination process is a process of determining which of the plurality of imaging parameters is an abnormal parameter. The image processing unit 84 that executes the abnormal parameter determination process is an example of an abnormal parameter determination unit.

  In the abnormal parameter determination process, the image processing unit 84 selects the approximate test image that most closely approximates the standard test image It0a among the plurality of comparison test images It0b in the test mode image Itm0 read from the test document by the scanner 2. Identify.

  In the present embodiment, the positions on the sheet 9X where the plurality of test images It0 corresponding to the plurality of image forming conditions are formed are known to the image processing unit 84. Therefore, the image processing unit 84 can calculate the density of the test image It0 for each image forming condition for each toner color.

  Then, the image processing unit 84 determines that the imaging parameter set to the test state under the test imaging condition corresponding to the approximate test image is the abnormal parameter. As described above, the test state is a state where a voltage corresponding to the imaging parameter is not applied.

  For example, the image processing unit 84 may calculate a plurality of density deviations that are differences between the density of the standard test image It0a and the density of the plurality of comparison test images It0b for each toner color. In this case, the image processing unit 84 is within the predetermined allowable range, and the test imaging condition corresponding to the smallest density deviation and the imaging parameter corresponding to the toner color are the abnormal parameters. It is determined that

  Further, the image processing unit 84 outputs a determination error indicating that the abnormal parameter cannot be determined as the determination result of the abnormal parameter when the density deviation within the allowable range does not exist.

  Then, the image processing unit 84 displays the determination result of the abnormal parameter on the display unit of the operation display unit 80. Thereby, the user can know the result of the automatic determination of the abnormal parameter.

[Application example]
It is also conceivable that the control unit 8 includes a communication unit (not shown), and the communication unit executes an abnormal parameter notification process. The abnormal parameter notification process is a process of transmitting the determination result of the abnormal parameter determination process and the preset user information to a preset destination. The destination is the service center of the image forming apparatus 10 or the like.

  By executing the abnormal parameter notification process, it is possible to save the user from reporting the abnormal parameter information to the service center or the like.

  The image forming apparatus according to the present invention can be freely combined with the above-described embodiments and application examples, or can be appropriately modified within the scope of the invention described in each claim. Alternatively, it may be configured by omitting a part.

1: Main unit 2: Scanner 3: Sheet transport unit 3X: Sheet cassette 4: Image forming unit 4X: Drive unit 8: Control unit 9X: Sheet 9Y: Document 10: Image forming apparatus 11: Document scanning unit 12: Document table cover 13: Image sensor 16: Document table 40: Image forming unit 41: Photoconductor 42: Charging unit 42X: Charging voltage application unit 43: Development unit 43X: DC development bias application unit 43Y: AC development bias application unit 44: Primary transfer unit 44X: primary transfer voltage application unit 45: primary cleaning unit 46: optical scanning unit 47: intermediate transfer belt 48: secondary transfer unit 48X: secondary transfer voltage application unit 49: fixing unit 80: operation display unit 81: UI control unit 82: Image forming control unit 83: Scanner control unit 84: Image processing unit 101: Sheet discharge tray 110: Scanning mechanism 120: ADF
121: Document supply tray 122: Document discharge tray 160: Contact unit 300: Sheet conveyance path 470: Secondary cleaning unit 811: Test mode setting unit 812: Abnormality determination mode setting unit 1200: Document conveyance path D1: Main scanning direction D2: Sub-scanning direction Im00: Document image It0: Test image It0a: Standard test image It0b: Comparison test image It1: Unit test mode image It2: Identification image Itm0: Test mode image P0: Fixed reading position

Claims (3)

An image forming unit that executes an image forming process for forming an image on a sheet;
A test mode setting unit capable of setting a test mode different from the standard mode in the initial state as the mode of the image forming process;
An image forming control unit for causing the image forming unit to sequentially execute the image forming process of a predetermined test image under each of a plurality of image forming conditions when the test mode is set;
An image reading unit that performs an image reading process of reading an image from a document and outputting data of the document image;
An abnormality determination mode setting unit capable of setting an abnormality determination mode in which a test document that is the document on which the test image is formed is set as the image reading processing mode;
An image reading control unit that causes the image reading unit to execute the image reading process when the abnormality determination mode is set;
An abnormal parameter for determining which of the plurality of predetermined imaging parameters constituting each of the imaging conditions is an abnormal parameter by performing image processing on the data of the original image corresponding to the test original A determination unit;
The plurality of imaging parameters are:
A charging voltage applied to a charging unit that charges a photoreceptor on which an electrostatic latent image is written;
A developing bias voltage applied between the photosensitive member and a developing unit that develops the electrostatic latent image on the surface of the photosensitive member into a toner image;
A transfer voltage applied to a transfer portion that transfers the toner image on the surface of the photoconductor to the sheet, and
The plurality of imaging conditions are:
And the standard imaging condition where all are set to a normal state to be employed in the standard mode of the plurality of imaging parameters,
A plurality of test imaging conditions in which some of the plurality of imaging parameters are set to a test state different from the standard state and all the remaining are set to the standard state,
The test state of the charging voltage, the development bias voltage, and the transfer voltage is a state in which no voltage is applied,
The abnormal parameter determination unit, among a plurality of density differences that are differences between the density of the test image corresponding to the standard imaging conditions and the density of the plurality of test images corresponding to the plurality of test imaging conditions, An image forming apparatus that determines that the imaging parameter corresponding to the test imaging condition corresponding to the smallest density difference is within the predetermined allowable range and is the abnormal parameter.   When the test mode is set, the image forming control unit performs the image forming process of an image including the test image and an identification image that represents each of the plurality of image forming conditions and is associated with the test image. The image forming apparatus according to claim 1, wherein the image forming unit is executed by the image forming unit. The image forming unit can form an image of a plurality of colors on a sheet,
When the test mode is set, the image forming control unit causes the image forming unit to execute the image forming process of the test image under the plurality of image forming conditions for each of the plurality of colors. The image forming apparatus according to claim 1 or 2.

Images