Image forming apparatus

An image forming apparatus, comprising:

• an image forming unit that can be replaced;
• an outer cover configured to become in an open status when the image forming unit is replaced;
• an inner cover configured to become in an open status with a manual operation after the outer cover becomes in an open status when the image forming unit is replaced, and the inner cover becoming in the open status with taking a predetermined time after the outer cover becomes in the open status;
• a cover open/close sensor configured to detect open and close statuses of the outer cover;
• and
• a controller;
• wherein the image forming unit comprises a non-volatile unit memory;
• and
• the controller (a) performs data communication with the unit memory, and (b) if data communication with the unit memory is ongoing when the cover open/close sensor detects that the outer cover becomes in an open status, completes the data communication and cuts off power supply to the image forming unit before the predetermined time elapses.