Electrophotographic image forming apparatus comprising a main body control means using information stored and held in advance under a predetermined condition to make an image forming operation by a process cartridge possible when interference occurs to cartridge-apparatus communication or a controller for controlling an image forming operation on the basis of main body information stored in advance

An image forming apparatus to which a process unit is detachably mountable for forming an image on recording medium, said image forming apparatus comprising:

• a mounting portion for detachably mounting said process unit, said process unit having:
• an image bearing member;
• process means for acting on said image bearing member;
• a non-volatile memory for storing information necessary for an image forming operation, on the basis of which said process unit performs an image forming operation;
• and
• a radio communication member for transmitting said information stored in said non-volatile memory to a main body of said image forming apparatus;
• a detecting member for detecting that said process unit is mounted on said mounting portion;
• a controller for receiving said information stored in said non-volatile memory through said radio communication member before said image forming operation, and for controlling said image forming operation on the basis of said information stored in said non-volatile memory,
• wherein said controller determines whether a communication of said radio communication member is normal in a state in which said detecting member detects that said process unit is mounted on said mounting portion, and wherein if the communication is normal, said controller controls said image forming operation on the basis of said information stored in said non-volatile memory, and wherein if the communication is not normal, said controller stops said image forming operation;
• and
• releasing means for issuing an instruction for releasing the stopping of said image forming operation when the communication of said radio communication member is not normal,
• wherein when the stopping of said image forming operation is released by said releasing means, said controller enables said image forming operation on the basis of predetermined information stored in a memory portion provided in said image forming apparatus.