Epson DFX-9000 - Manual (Page 112)

112 Problem Solver
1. Make sure paper is loaded and the printer is turned off.
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Caution:
Whenever you turn off the printer, wait at least five seconds
before turning it back on; otherwise you may damage the
printer.
2. To enter hex dump mode, turn on the printer while holding
down the Top of Form and LF/FF Load buttons.
3. Open a software program and send a print job to the printer.
Your printer prints all the codes it receives in hexadecimal
format.
By comparing the characters printed in the right column with
the printout of the hexadecimal codes, you can check the
codes the printer is receiving. If characters are printable, they
appear in the right column as ASCII characters. Nonprintable
codes, such as control codes, are represented by dots.
4. To turn off hex dump mode, press the Pause button, and then
turn off the printer.
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Caution:
Do not turn off the printer while it is printing the hex dump.
Always press the Pause button to stop printing and then turn
off the printer.