Epson TM-C3500 Series Developer's Manual page 10

3
Use an object with a sharp tip to operate the dip switches.
The dip switches are numbered in order from the left. Up is the ON state
and down is the OFF state. Turn on dip switch 1.
4
Attach the dip switch cover and close the ink cartridge cover.
1 2 3 4 5 6 7 8
10