Image forming apparatus

1. An image forming apparatus, comprising:

a body housing having formed thereon an opening;

a door member moveable so as to selectively open and close the opening;

at least one developing cartridge detachably receivable in the body housing through the opening, the at least one developing cartridge including a cartridge status chip having stored therein an operational state information relating to the at least one developing cartridge;

at least one terminal member arranged on the door member so as to come into contact with at least one cartridge terminal provided on the cartridge status chip when the door member is closed; and

a controller electrically connected to the at least one terminal member, the controller being configured to make available an electrical power for, and to receive the operational state information from, the cartridge status chip through the contact between the at least one terminal member and the at least one cartridge terminal of the cartridge status chip, the controller being further configured to determines whether the door member is opened or closed based on whether the electrical power made available is being consumed.

2. The image forming apparatus according to claim 1 , wherein the controller determines that the door member is closed if it is determined that the electrical power is being consumed, and determines that the door member is opened if it is determined that the electrical power is not being consumed.

3. The image forming apparatus according to claim 2 , further comprising a power supplying unit received in the body housing, the power supplying unit being configured to output an operational electrical power with which to operate one or more components of the image forming apparatus,

wherein the controller is configured to prevent the power supplying unit from outputting the operational electrical power if it is determined that the door member is opened and to allow the power supplying unit to output the operational electrical power if it is determined that the door member is closed.

4. The image forming apparatus according to claims 1 , wherein the cartridge status chip includes a customer replaceable unit monitor (CRUM) memory storing therein the operational state information.

5. The image forming apparatus according to claim 1 , wherein the at least one cartridge terminal each includes:

a first cartridge terminal through which the operational sate information is transmitted;

a second cartridge terminal through which an operating supply power is received, with which operating supply power the cartridge status chip being operable to provide the operational state information to the controller; and

a third cartridge terminal configured to receive therethrough the electrical power made available by the controller,

wherein the controller determines that the door member is open based at least in part on determination that the electrical power is not being drawn by the third cartridge terminal.

6. The image forming apparatus according to claim 5 , wherein the at least one cartridge terminal further includes a fourth cartridge terminal connected to a common ground for the operating supply power and the electrical power.

7. The image forming apparatus according to claim 5 , wherein the at least one developing cartridge comprises a plurality of developing cartridges each containing developer of a color different from developer contained in other ones of the plurality of developing cartridges, and

wherein the at least one terminal member comprises a plurality of terminal members corresponding to the plurality of developing cartridges, the plurality of terminal members each being configured to come into contact with the at least one cartridge terminal of the cartridge status chip of respective corresponding one of the plurality of developing cartridges.

8. The image forming apparatus according to claim 7 , further comprising a power supplying unit configured to output a plurality of levels of voltages each for operating different one or more components of the image forming apparatus,

wherein the controller is configured to sequentially block ones of the plurality of levels of voltages from being applied to corresponding ones of the one or more components of the image forming apparatus based on an order in which the third cartridge terminal of ones of the plurality developing cartridges is released from corresponding ones of the plurality of terminal members.

9. An image forming apparatus having an access opening formed on a main housing thereof for providing mounting access therethrough of one or more removable components of the image forming apparatus, comprising:

a door coupled to the main housing in such a manner as to be moveable selectively to open and to close the access opening;

one or more electrical contact terminals arranged on a side of the door facing the access opening in such a manner the one or more electrical contact terminals come into an electrical contact with at least one of component contact terminals formed respectively on the one or more removable components received in the main housing when the door is closed; and

a controller configured to control operation of the image forming apparatus based at least in part on a determination of whether an electrical current flows through the one or more electrical contact terminals.

10. The image forming apparatus of claim 9 , wherein the one or more electrical contact terminals comprises a first electrical contact terminal and a second electrical contact terminal, and

wherein the controller is configured to interrupt supply of power to a first internal component of the image forming apparatus in response to determination that no electrical current is flowing through the first electrical contact terminal and to interrupt supply of power to a second internal component of the image forming apparatus in response to determination that no electrical current is flowing through the second electrical contact terminal.

11. The image forming apparatus of claim 10 , wherein an operating voltage of the first internal component of the image forming apparatus is higher than that of the second internal component of the image forming apparatus, and

wherein the door is rotatable about a rotational axis, the first electrical contact terminal being positioned further away from the rotational axis of the door than the second electrical contact terminal.

12. The image forming apparatus of claim 10 , wherein the first internal component of the image forming apparatus is configured to emit a light, and

wherein the door is rotatable about a rotational axis, the first electrical contact terminal being positioned furthest away from the rotational axis of the door among all of the one or more electrical contact terminals.

13. The image forming apparatus of claim 9 , wherein the one or more removable components comprises a developer cartridge in which a supply of developer of at least one color is stored.

14. A removable component unit of an image forming apparatus detachably receivable in a main housing of the image forming apparatus through an access opening formed on the main housing that includes a door for selectively closing the access opening, comprising:

a unit housing having housed therein a memory device in which information relating to the removable component unit is stored; and

at least one electrical contact terminal arranged on the unit housing so as to be engageable with an electrical terminal provided on the door, the at least one electrical contact terminal forming at least a part of an electrical current path between the at least one electrical contact terminal and an electrical ground to which a ground terminal of the memory device is connected.

15. The removable component unit of claim 14 , wherein the removable component unit comprises a developer cartridge in which a supply of developer of at least one color is stored, the memory device comprising a customer replaceable unit monitor (CRUM) memory for storing therein information relating to an amount of developer contained in the developer cartridge.

16. The removable component unit of claim 15 , wherein the developer cartridge contains yellow color developer.

17. The removable component unit of claim 15 , wherein the developer cartridge contains magenta color developer.

18. The removable component unit of claim 14 , wherein the at least one electrical contact terminal comprises a first electrical contact terminal for receiving therethrough an operating supply voltage for the memory device and a second electrical contact terminal different from the first electrical contact terminal.

19. The removable component unit of claim 18 , wherein the electrical current path between the at least one electrical contact terminal and the electrical ground comprises a resistive current path.

20. The removable component unit of claim 14 , wherein the at least one electrical contact terminal comprises at least two electrical contact terminals that are electrically connected with each other.