ZD620 and ZD420 Desktop Printers User Guide

Adjusting the Movable Sensor for Black Marks or Notches

Black mark sensing looks for non-reflective surfaces such as black marks, black lines, notches or holes on the back of the media which do not reflect the sensor’s near infrared light beam back to the sensor’s detector. The sensor light and its black mark detector are next to each other under the sensor cover.

Position the movable sensor’s alignment arrow to the middle of the black mark or notch in the underside of the media.

Verify that you have set the sensor alignment as far as possible from the edge of the media but where 100% of the sensor window is covered by the mark.

When printing, the media can move from side to side ±1mm (due to media variations and edge damage due to handling). Notches cut into the side of the media can also become damaged.