Image forming apparatus to which cartridge is attachable and including controller capable of determining whether cartridge is attached to image forming apparatus

1. An image forming apparatus comprising:

a controller;

a main body frame;

a drum cartridge attachable to the main body frame, the drum cartridge comprising:

a memory storing information related to the drum cartridge;

a cartridge data terminal configured to communicate the information stored in the memory; and

one or more cartridge terminals including a cartridge detection terminal; and

a display,

wherein the controller includes:

a main body data terminal electrically connected to the cartridge data terminal in a case where the drum cartridge is attached to the main body frame; and

one or more main body terminals including a main body detection terminal, the main body detection terminal being electrically connected to the cartridge detection terminal in the case where the drum cartridge is attached to the main body frame, and wherein the controller is configured to perform:

determining whether the main body detection terminal and the cartridge detection terminal are electrically connected with each other;

determining a connection status of a toner cartridge to the drum cartridge based on a connection between a specific cartridge terminal included in the one or more cartridge terminals and a specific main body terminal included in the one or more main body terminals;

displaying a determination result of the determining whether the main body detection terminal and the cartridge detection terminal are electrically connected with each other on the display; and

displaying a message on the display indicating the connection status of the toner cartridge to the drum cartridge.

2. The image forming apparatus according to claim 1 , wherein the drum cartridge further comprises a circuit board, and

wherein the circuit board comprises the memory, the cartridge data terminal and the cartridge detection terminal, the cartridge data terminal being electrically connected to the memory.

3. The image forming apparatus according to claim 1 , wherein the controller is configured such that in a case where the controller determines that the main body detection terminal and the cartridge detection terminal are electrically connected with each other, the controller instructs the display to display a message indicating that the drum cartridge is attached to the main body frame when the controller determines whether the main body detection terminal and the cartridge detection terminal are electrically connected with each other.

4. The image forming apparatus according to claim 1 , wherein the controller is configured such that in a case where the controller determines that the main body detection terminal and the cartridge detection terminal are not electrically connected with each other, the controller instructs the display to display a message indicating that the drum cartridge is not attached to the main body frame when the controller determines whether the main body detection terminal and the cartridge detection terminal are electrically connected with each other.

5. The image forming apparatus according to claim 1 , wherein the controller is further configured to perform:

determining whether the controller is capable of communicating with the information stored in the memory through the main body data terminal in a case where the controller determines that the main body detection terminal and the cartridge detection terminal are electrically connected with each other; and

displaying a message indicating that the controller is unable to communicate with the information stored in the memory on the display in a case where the controller determines that the controller is unable to communicate with the information stored in the memory through the main body data terminal.

6. The image forming apparatus according to claim 1 , wherein the drum cartridge further comprises:

a cartridge voltage terminal electrically connected to the memory;

a cartridge ground terminal electrically connected to the memory; and

a resistor having one end and another end, the one end being electrically connected to the cartridge detection terminal, the another end being electrically connected to the cartridge ground terminal,

wherein the controller further includes:

a main body voltage terminal electrically connected to the controller and supplying a first voltage to the cartridge voltage terminal, the main body voltage terminal being electrically connected to the cartridge voltage terminal in the case where the drum cartridge is attached to the main body frame;

a main body ground terminal electrically connected to the cartridge ground terminal in the case where the drum cartridge is attached to the main body frame; and

a main body resistor having one end and another end, the one end of the main body resistor being connected to the main body detection terminal, the another end of the main body resistor being connected to the main body voltage terminal,

wherein the main body detection terminal and the main body voltage terminal are connected with each other through the main body resistor, thereby causing a voltage at the main body detection terminal to have the same potential as the first voltage at the main body voltage terminal in the case where the drum cartridge is not attached to the main body frame,

wherein, in the case where the drum cartridge is attached to the main body frame, current flows from the main body voltage terminal toward the main body ground terminal through the main body resistor, the main body detection terminal, cartridge detection terminal, cartridge resistor, and the cartridge ground terminal, so that the voltage at the main body detection terminal, which is positioned between the main body resistor and the cartridge resistor, becomes a second voltage that is lower than the first voltage and higher than the ground voltage, and

wherein, when the controller determines whether the main body detection terminal and the cartridge detection terminal are electrically connected with each other, the controller is configured to perform:

determining that the main body detection terminal and the cartridge detection terminal are not connected with each other in a case where the voltage of the main body detection terminal is the first voltage; and

determining that the main body detection terminal and the cartridge detection terminal are connected with each other in a case where the voltage of the main body detection terminal is the second voltage.

7. The image forming apparatus according to claim 1 , wherein the drum cartridge further comprises:

a cartridge voltage terminal electrically connected to the memory;

a cartridge ground terminal electrically connected to the memory; and

a resistor having one end and another end, the one end being electrically connected to the cartridge detection terminal, the another end being electrically connected to the cartridge voltage terminal,

wherein the controller further includes:

a main body voltage terminal electrically connected to the controller and supplying a first voltage to the cartridge voltage terminal, the main body voltage terminal being electrically connected to the cartridge voltage terminal in the case where the drum cartridge is attached to the main body frame;

a main body ground terminal electrically connected to the cartridge ground terminal in the case where the drum cartridge is attached to the main body frame; and

a main body resistor having one end and another end, the one end of the main body resistor being connected to the main body detection terminal, the another end of the main body resistor being connected to the main body ground terminal,

wherein the voltage at the main body detection terminal is a ground voltage having the same potential as the potential of the main body ground terminal in the case where the drum cartridge is not attached to the main body frame, the main body detection terminal and the main body ground terminal being connected with each other through the main body resistor,

wherein, in the case where the drum cartridge is attached to the main body frame, the current flows from the main body voltage terminal toward the main body ground terminal through the cartridge voltage terminal, cartridge resistor, cartridge detection terminal, the main body detection terminal and the main body resistor, so that the voltage at the main body detection terminal, which is positioned between the main body resistor and the cartridge resistor, becomes a second voltage that is lower than the first voltage and higher than the ground voltage, and

wherein, when the controller determines whether the main body detection terminal and the cartridge detection terminal are electrically connected with each other, the controller is configured to perform:

determining that main body detection terminal and the cartridge detection terminal are not connected with each other in a case where the voltage of the main body detection terminal is the ground voltage; and

determining that main body detection terminal and the cartridge detection terminal are connected with each other in a case where the voltage of the main body detection terminal is the second voltage.

8. The image forming apparatus according to claim 2 , wherein the drum cartridge includes a photosensitive drum, and

wherein the memory is a drum memory storing information related to the drum cartridge.

9. The image forming apparatus according to claim 8 , wherein the drum cartridge comprises a drum frame to which the toner cartridge is attachable, the toner cartridge having a toner memory serving as a storage medium, and

wherein the circuit board relays information stored in the toner memory to the controller.

10. The image forming apparatus according to claim 6 , wherein the cartridge resistor is a thermistor.

11. The image forming apparatus according to claim 7 , wherein the cartridge resistor is a thermistor.

12. The image forming apparatus according to claim 1 , wherein the drum cartridge includes a drum frame, to which the toner cartridge is attachable.

13. The image forming apparatus according to claim 1 , wherein the one or more cartridge terminals includes a second cartridge detection terminal, the one or more main body terminals includes a second main body detection terminal, and the toner cartridge includes a toner cartridge detection terminal, and

wherein determining a connection status of the toner cartridge to the drum cartridge is based on whether the second main body detection terminal and the toner cartridge detection terminal are electrically connected with each other via an electrical connection between the second main body detection terminal and the second cartridge detection terminal.

14. The image forming apparatus according to claim 1 , wherein the one or more cartridge terminals includes a cartridge interrupt terminal and the one or more main body terminals includes a main body interrupt terminal, and wherein determining a connection status of the toner cartridge to the drum cartridge is based on an interrupt signal communicated when the cartridge interrupt terminal and the main body interrupt terminal are electrically connected with each other.