Issue / Question
How do you adjust the movable media sensor
ZD888 Thermal Transfer and ZD888 Direct Thermal printers
Resolution / Answer
Using the Movable Sensor
The movable sensor is a dual function sensor. It provides transmissive (sees through media) and reflective media sensing. The printer can use either sensing method, but not both at the same time.
The movable sensor has single sensor position for Web/Gap media, the Default position.
The movable sensor allows the printer to use media with black marks or notches (holes through the media) on the back side of the media (or media liner). The sensor aligns to the middle of black marks or notches not in the center of the media roll to avoid Web/Gap sensing array.
Adjusting the Movable Sensor for Black Marks or Notches
The 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. Sensor alignment should be set as far as possible from the edge of 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.