Cleaning the Sensor – Lower Half of the ZD620/ZD420 Printers

Clean the window of the movable sensor by gently brushing away dust or using a can of compressed air. If necessary, use a dry swab to brush away dust.

If adhesives or other contaminants remain, use a swab moistened with 99% pure isopropyl alcohol to break them up. Discard the used swab(s).

Use a dry swab to remove any residue that may be left from the first cleaning.

Repeat the preceding steps as required until all residue and streaks are removed from the sensor.