Epson LQ-2550 User Manual page 29

Note: To clear a paper jam, it is recommended that you set the printer
off line and use the FORM FEED or LINE FEED button. If it is necessary
to use the platen knob to clear the jam, be sure to turn the printer off
first.
7. A list of your printer's settings is printed first, followed by a series of
characters. The self test continues until the paper runs out or you
press the ON LINE button.
If the self test results are satisfactory and you wish to stop the test,
press the ON LINE button.
If paper is still loaded, press the LOAD/EJECT button to eject it. Then
8.
turn off the printer.
WARNING: After you turn off the printer, always wait at
least five seconds before you turn it back on. Rapidly
switching the printer on and off can damage the printer.
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Setting Up the Printer