How do I perform a self test on my Zebra Thermal Printer?

With the printer power off, press and hold the feed button while you turn on the power.
Continue holding the feed button down until the printer begins flashing green (pause mode).
The printer will flash several different color and flashing combinations prior to flashing only green. Release the feed button. The printer prints out a listing of its current
configuration.
After printing the label, the printer will automatically enter a diagnostic mode in which the printer prints out a literal representation of all data subsequently received.
To exit the diagnostic mode and resume printing, turn off and then turn on the printer.