Image forming apparatus

An image forming apparatus comprising:

• a main assembly;
• a first process cartridge including a rotatable first photosensitive member, a first charging member configured to electrically charge a surface of the first photosensitive member, and a first developing member including a first accommodating portion for accommodating toner and configured to form a toner image by supplying the toner to the surface of the first photosensitive member;
• a memory configured to store information correlating with a charge amount of the toner accommodated in the first accommodating portion;
• a second process cartridge including a rotatable second photosensitive member, a second charging member configured to electrically charge a surface of the second photosensitive member, and a second developing member including a second accommodating portion for accommodating toner and configured to form a toner image by supplying the toner to the surface of the second photosensitive member;
• an exposure portion configured to form an image portion for forming the toner image on each of the surfaces of the first photosensitive member and the second photosensitive member by irradiating the charged surfaces of the first photosensitive member and the second photosensitive member with light;
• an applying portion configured to apply a common transfer voltage to each of transfer portions where the toner images are transferred from the first photosensitive member and the second photosensitive member onto a toner image receiving member;
• and
• a controller configured to control the applying portion and the exposure portion,
• wherein the first process cartridge is detachably mountable to the main assembly, and
• wherein in a case that the information on the toner accommodated in the first accommodating portion is changed from first information to second information by exchanging the first process cartridge accommodated in the main assembly with the second process cartridge different from the first process cartridge,
• the controller carries out control so that the transfer voltage is changed from a first transfer voltage to a second transfer voltage and so that a potential of the image portion formed on the second photosensitive member is changed from a first potential to a second potential.