Star TSP2000 Série Mode D'emploi page 19

(4) Insert the paper roll, and check that the sensor correctly detects that the paper
roll is about to run out.
Error LED
Diameter of remaining paper A
Approx. ø22 mm
Approx. ø26 mm
Cautions
1) The factory setting is level 1.
2) Always use a paper roll with a core that has an inside diameter of 12 mm and
an outside diameter of 18 mm in order to ensure proper detection of the
remaining paper amount.
LED goes out when there is paper.
LED flashes when the paper is about to run out.
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Screw position
Level 1 (bottom)
Level 2 (top)