Printing Hex Dump - Epson FX-2190 Reference Manual

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2. To run the test using the Draft font, turn on the printer while
holding down the LF/FF button. To run the test using the
printer's near letter-quality fonts, hold down the Load/Eject
button while you turn on the printer. Either self test can help
you determine the source of your printing problem; however,
the draft self test prints faster than the near letter-quality test.
After a few seconds, the printer loads the paper automatically
and begins printing the self test. A series of characters is
printed.
Note:
To temporarily stop the self test, press the Pause button. To resume
the test, press the Pause button again.
3. To end the self test, press the Pause button to stop printing.
If paper remains in the printer, press the Load/Eject button
to eject the printed page. Then turn off the printer.
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Printing Hex Dump

If you are an experienced user or a programmer, you can print a
hexadecimal dump to isolate communication problems between
the printer and your software program. In hex dump mode, the
printer prints all data it receives from the computer as
hexadecimal values.
132 Problem Solver
Caution:
Whenever you turn off the printer, wait at least five seconds
before turning it back on; otherwise you may damage the
printer.
Caution:
Do not turn off the printer while it is printing the self test.
Always press the Pause button to stop printing and the
Load/Eject button to eject the printed page before you turn
off the printer.