Image forming apparatus

An image forming apparatus comprising:

• a first image forming unit including:
• a first photosensitive member;
• a first charging member configured to charge the first photosensitive member;
• a first exposure device configured to expose the first photosensitive member to form an electrostatic image;
• and
• a first developing device configured to develop the electrostatic image formed on the first photosensitive member;
• a second image forming unit including:
• a second photosensitive member;
• a second charging member configured to charge the second photosensitive member;
• a second exposure device configured to expose the second photosensitive member to form an electrostatic image;
• and
• a second developing device configured to develop the electrostatic image formed on the second photosensitive member;
• an endless intermediate transfer member, to which toner images formed on the first photosensitive member and the second photosensitive member are to be transferred;
• a cleaning blade brought into abutment against an outer peripheral surface of the endless intermediate transfer member to remove a toner on the endless intermediate transfer member;
• and
• a control unit configured to execute:
• a first image forming mode, in which the first photosensitive member and the second photosensitive member brings into abutment against the endless intermediate transfer member and an image formation executes;
• and
• a second image forming mode, in which the first photosensitive member separates from the endless intermediate transfer member and the first photosensitive member and the first developing device stop driving, and the second photosensitive member brings into abutment against the endless intermediate transfer member and an image formation executes,
• wherein the control unit is configured to set a potential difference, which is a difference between an absolute value of a dark point potential of the second photosensitive member charged by the second charging member and an absolute value of a direct current component of a developing bias to be applied to the second developing device, to have different values between the first image forming mode and the second image forming mode.