Epson TM-300A Operator's Manual page 25

The adjusting screw which holds the roll paper near-end detector, may be
loosened and then set the top of "B" to the adjustment value found in
tighten the adjusting screw. (The adjusting screw can be turned with a coin.)
Be sure that the detecting lever operates smoothly after finishing the adjust-
ment.
NOTES:
Since the adjustment values in Table 3-1 are calculated from standard
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measurements, there may be some variations depending on the model.
If a roll paper with a red end mark at the paper end is used, this mark may
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cause the paper to stick together. If this occurs, the dimension A differs from
the table.
Be sure to that the detecting lever operates smoothly after finishing the
l
adjustment.
If the roll paper becomes loose due to poor paper quality, the detector may
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operate incorrectly.
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and