Image forming apparatus and method for controlling image forming apparatus

An information processing apparatus connectable to a printer in a communicatable manner, the printer including a photosensitive member, a charging unit configured to charge the photosensitive member, an exposure unit configured to expose the photosensitive member to form an electrostatic latent image, and a developing unit configured to develop the electrostatic latent image on the photosensitive member, the information processing apparatus comprising:

• a controller configured to:
• acquire read data related to a test chart printed by the printer, wherein the read data is outputted from a reading device;
• determine whether a streak of a predetermined type has occurred in the test chart based on the read data;
• and
• detect an abnormality of the developing unit in a case in which it is determined that the streak of the predetermined type has occurred in the test chart,
• wherein the streak of the predetermined type includes a streak in which a density of an edge portion of the streak is higher than a density of a center portion of the streak.

A control method of a printer including a photosensitive member, a charging unit configured to charge the photosensitive member, an exposure unit configured to expose the photosensitive member to form an electrostatic latent image, and a developing unit configured to develop the electrostatic latent image on the photosensitive member, the method comprising:

• printing a test chart, wherein the test chart is used for detecting a part of the printer causing a streak that occurs when the printer forms an image;
• reading the test chart by a reading device;
• detecting a streak of a predetermined type from the test chart based on a read result of the test chart;
• and
• determining the developing unit as the part causing the streak in a case in which the streak of the predetermined type is detected,
• wherein the streak of the predetermined type includes a streak in which a density of an edge portion of the streak is higher than a density of a center portion of the streak.

An information processing apparatus that detects an abnormality of a printer, the printer including a photosensitive member, a charging unit configured to charge the photosensitive member, an exposure unit configured to exposure the photosensitive member charged by the charging unit to form an electrostatic latent image, and a developing unit configured to develop the electrostatic latent image on the photosensitive member, the information processing apparatus comprising:

• a controller configured to:
• acquire read data related to a test chart printed by the printer, wherein the read data is outputted from a reading device;
• determine whether a streak of a predetermined type occurs in the test chart based on the read data;
• and
• detect an abnormality of the developing unit in a case where the streak of the predetermined type occurs in the test chart,
• wherein the streak of the predetermined type is a streak extending in a conveyance direction in which the printer conveys a sheet,
• wherein a density of the streak of the predetermined type is lower than a reference density of an area in which no streak occurs in the test chart, and
• wherein a density of an area adjacent to the streak of the predetermined type is higher than the reference density.

A detection method that detects an abnormality of a printer, the printer including a photosensitive member, a charging unit configured to charge the photosensitive member, an exposure unit configured to expose the photosensitive member to form an electrostatic latent image, and a developing unit configured to develop the electrostatic latent image on the photosensitive member, the method comprising:

• printing a test chart, wherein the test chart is used for detecting a streak that occurs when the printer forms an image;
• reading the test chart with a reading device;
• detecting a streak of a predetermined type in the test chart based on a read result of the test chart;
• and
• detecting an abnormality of the developing unit in a case where the streak of the predetermined type is detected,
• wherein the streak of the predetermined type is a streak extending in a conveyance direction in which the printer conveys a sheet,
• wherein a density of the streak of the predetermined type is lower than a reference density of an area in which no streak occurs in the test chart, and
• wherein a density of an area adjacent to the streak of the predetermined type is higher than the reference density.