Epson PLQ-20 Reference Manual page 104

❏ Always close the printer cover before printing. The printer does not
print when the printer cover is open.
Follow these steps to print a hex dump:
1. Turn off the printer.
Caution:
c
Whenever you turn off the printer, wait at least five seconds
before turning it back on; otherwise you may damage the
printer.
2. Turn on the printer while holding the Offline button to enter
hex dump.
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.
Caution:
c
Do not turn off the printer while it is printing the hex dump.
Always press the Offline button to pause printing. Then
turn off the printer.
Chapter 6 Problem Solver 104