To prevent early deterioration of the color drums, the image transfer belt unit has a contact/separation mechanism and, during monochrome printing, the image transfer belt separates from the color drums. Contact/separation of the image transfer belt unit is performed via a gear from the ITB contact and release motor (also used as the magenta toner supply motor). Separation or contact is detected by the ITB contact and release sensor.
[A]: Slider
[B]: Drum
[C]: Contact and release cam
[D]: ITB contact and release motor (also used as the magenta toner supply motor)
[E]: ITB contact and release sensor
[F]: Guide
[G]: Image Transfer Roller