Epson LQ-300+ User Manual page 28

6. To end the self test, make sure the printer is not printing. Press
LF/FF to eject the sheet; then turn off the printer.
Here is part of a typical self-test printout:
Note:
If the self test did not print satisfactorily, see Chapter 4,
"Troubleshooting." If it prints correctly, proceed to the next section.
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Setting Up the Printer