Epson TM-C3400A User Manual page 16

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Adjusting the guides
When the paper width does not need to be changed, skip this step.
1. Pull the release lever to open the roll paper cover.
2. Unlock the roll paper guide.
3. Push the roll paper guide on the left in the direction of the arrow,
and load the roll paper with the printable side up completely
inside the printer.
4. Lock the roll paper guide.
5. Unlock the paper ejection guide, using the tip of a tool, such as a
pen.
16 TM-C3400A User's Manual