Epson FX-2190 Reference Manual page 35

4. Slide the left sprocket approximately 12 mm (0.5 inch) from
the far left position and push the blue lever back to lock it in
place. Then slide the right sprocket to match the width of your
paper, but do not lock it.
approx. 12 mm (0.5 inch)
The triangle mark on top of the printer indicates the point furthest
to the left where printing can begin.
Paper Handling
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