Image forming apparatus

An image forming apparatus, comprising:

• an image forming section including a photoreceptor, a charging section that comes into contact with the photoreceptor to charge the photoreceptor, an exposure section that forms an electrostatic latent image on the photoreceptor, a developing section that supplies toner to the photoreceptor to form a toner image corresponding to the electrostatic latent image, a transfer section that transfers the toner image to a storage medium, a toner concentration sensor that detects a concentration of the toner image transferred to the transfer section, and a fixing section that thermally fixes the toner image to the storage medium;
• and
• one or more controllers that control the image forming section,
• wherein, at a time of start-up of the image forming section, the one or more controllers perform determination processing by which both a first contact state between the photoreceptor and the transfer section and a second contact state between the photoreceptor and the charging section are determined,
• when determining that the photoreceptor is in the first contact state with the transfer section and the photoreceptor is in the second contact state with the charging section, the one or more controllers determine normality and start up the image forming section, and then shift the image forming apparatus to a predetermined standby state,
• when determining that the photoreceptor is not in the first contact state with the transfer section or the photoreceptor is not in the second contact state with the charging section, the one or more controllers determine that an abnormality has occurred and limit an operation of the image forming section to a predetermined operation, and
• in the determination processing, the one or more controllers control the charging section, the exposure section, the developing section, and the transfer section to transfer a predetermined patch toner image to the transfer section, and then cause the toner concentration sensor to detect a concentration of the predetermined patch toner image, and determine, based on a detection result, the first contact state between the photoreceptor and the transfer section and the second contact state between the photoreceptor and the charging section.