Image forming apparatus capable of determining whether communication between controller and storage medium of developing cartridge is established

An image forming apparatus comprising:

• a main frame;
• a developing cartridge attachable to the main frame, the developing cartridge comprising:
• a casing configured to accommodate developing agent therein;
• a storage medium having an electrical contact surface;
• and
• a developing roller movable together with the casing;
• a photosensitive drum contactable with the developing roller in a state where the developing cartridge is attached to the main frame;
• an electrical connector contactable with the electrical contact surface in the state where the developing cartridge is attached to the main frame;
• a separation mechanism configured to move the casing relative to the main frame in a separating direction in which the developing roller separates from the photosensitive drum;
• and
• a controller configured to control the separation mechanism, the controller configured to communicate with the storage medium via the electrical connector in the state where the developing cartridge is attached to the main frame,
• the controller being configured to perform:
• moving, by controlling the separation mechanism, the casing relative to the main frame in the separating direction;
• determining, in response to performing the moving, whether communication with the storage medium is established;
• and
• outputting, when determining in the determining that the communication with the storage medium is not established, an error.