Setting the printer to Hex Dump Mode
(Communications Diagnostics Mode)

Turn off printer and have media loaded.

Hold feed button down, and turn printer back on while holding down the feed button.

When the light starts flashing, release the feed button.

Printer light will turn green and advance a few blanks and then print its internal information onto the label
ending with a statement indicating it is now in 'DUMP' mode as shown in figure 1.

figure 1

The printer in now in the 'DUMP' mode

Send a format to the printer and the raw hex code should start printing onto the labels as shown in figure 2.
If nothing prints at this point try pressing the FEED button to initiate the print.

figure 2

To get the printer out of 'DUMP' mode turn the printer off then back on.