Epson Stylus Pro 11880 User Manual page 57

If the lights are off, the light emitter and light detector might not be
aligned correctly, or something might be blocking the signal. If
necessary, adjust the light emitter, then turn the dial to lock its position.
3. Press l to select
4. Align the edge of the paper with the horizontal line. If you're using the
automatic media tracking system, the barcode is scanned.
5. Press d to feed the paper.
6. Use three pieces of tape to attach the paper to the take-up reel core.
7. Press d to feed the paper and create some slack.
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Handling Paper and Other Media
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Dial
Sensor light