Epson TM-U325D Operator's Manual page 38

A line of dots is missing in the printout.
The print head may be damaged. Stop printing and contact your
dealer or a qualified service person.
Removing jammed paper
Follow these steps to clear a paper jam:
CAUTION:
The print head becomes very hot during printing. Allow it to
cool before you reach into the printer.
1. Open the printer cover.
2. Pull up the paper and cut the paper at the dotted line shown in
the illustration below.
3. Remove the paper roll from the printer.
4. Remove the ribbon cassette.
Cut here
Troubleshooting 3-3