Epson LQ-300+II User Manual page 118

4. To end the self test, press the Pause button to stop printing.
If paper remains in the printer, press the LF/FF button to eject
the printed page. Then turn off the printer.
Caution:
c
Do not turn off the printer while it is printing the self test. Always
press the Pause button to stop printing and the LF/FF button to
eject the printed page before you turn off the printer.
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