A Lemur with Universal Paper Guide (UPG) uses two sensors to aid in positioning the media within the printer.


  • Load Opto – This is located on the front part of the UPG rail (media exits the printer) and has a yellow dot. This sensor is responsible for detecting if there is media loaded into the printer.
  • Cut/Tear Opto – This is located towards the rear (media is loaded into the printer) of the UPG rail and normally has no dot. This sensor is responsible for detecting the black timing mark on the back of the media.


Note: Image above shows the optos in the RADJ rail (right side looking from the rear of the printer).



The procedure below describes the change from RADJ to ADJ with bottom opto configuration. 

The steps for ADJ to RADJ as wel as top opto are similar.


  1. Make sure power is off and the AC cord is disconnected from the printer.

  2. To remove the sensors from the rail, you need to slide the sensor towards the larger takeout opening in the rail.

  3. Start with gently sliding the Load opto backwards. Once the sensor gets to the larger takeout opening, gently remove it from the rail.
    Note: Leave the wiring connected.
  4. Find the opening in the other rail.

  5. Insert the Load opto into the other rail and gently slide it forward until the end.

  6. Next, try to remember the approximate location of the sensor. Now gently slide the Cut/Tear opto forward. Once the sensor gets to the larger takeout opening, gently remove it from the rail.
    Note: Leave the wiring connected.
  7. Again, find the opening in the other rail.

  8. Insert the Cut/Tear opto into the other rail and gently slide it backwards to about the position it was on the other rail.

  9. Power the printer back on and insert tickets.

  10. You now need to adjust the Cut/Tear opto.
    In a printer with a cutter, you have to adjust the cut position to about 1-2mm behind the perforation.
    In a printer without a cutter, you have to adjust the tear-off position to align the perforation with the edge of the top cover of the cabinet.
    Note: When adjusting the sensor, always restart the printer.

  11. Your print is now ready for use.