Epson TM-U200D series Operator's Manual page 14

3. Two spacers are included with the near-end detector. See the
illustration below and decide whether or not you want to use
them. Use them if you want the near-end detector to be
triggered when distance A is 3 to 4 mm; otherwise it will be
triggered when distance A is approximately 6 mm.
4. Secure the paper roll near-end detector (and spacers) with two
screws. When you insert the spacers, be sure you set the
spacers in the direction shown in the illustration.
distance A
Spacer
Setting Up the Printer 1–3