| 摘要 |
An image forming apparatus including a main body having an image forming unit forming an image to a printing medium; and a plurality of mail box modules which are disposed to an output side of the printing medium in the main body, each mail box module respectively including a driving unit selectively outputting the printing medium from the main body, and a control circuit unit controlling the driving unit. The control circuit unit includes a shift register having channels corresponding to the total number of the plurality of mail box modules, and, if receiving an identifying ID information of the mail box module from the main body, turns on one channel of the channels corresponding to the identifying ID information; and a multiplexer which outputs an active signal to the driving unit if the channel turned on by the shift register corresponds to a predetermined identifying ID.
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