Patent ID: 7486906

Claim:
An electrophotographic printer comprising: a main frame to define an internal space of the electrophotographic printer; a photosensitive drum unit detachably installed at a drum operating position in the internal space of the main frame through an upper side of the main frame, and having a photosensitive drum on which an electrostatic latent image is formed; and an intermediate transfer unit detachably installed at a transfer unit operating position in the internal space of the main frame through the upper side of the main frame independently from the photosensitive drum unit after the photosensitive drum unit has been disposed in the drum operating position in the internal space of the main frame, and having a transfer belt to which a toner image is transferred from the photosensitive drum and with which the photosensitive drum comes in contact when the intermediate transfer unit is installed separately from the photosensitive drum unit in the internal space, wherein the photosensitive drum unit and the intermediate transfer unit are sequentially mounted and dismounted into and from the internal space through the upper side of the main frame, the photosensitive drum unit being firstly mounted, the intermediate transfer unit is installed above the photosensitive drum unit, and the photosensitive drum unit and the intermediate transfer unit operate in the drum operating position and the transfer unit operating position, respectively.