1) On the selection wheel, press the “Menu" icon button
2) On the numeric keypad, enter "# 1 9 3 4"
3) Press the “Menu" icon button again. The printer displays "Tech Mode".
4) On the selection wheel, press the "OK" button
Your printer is now in Tech Mode. Within this menu you can reset the printer back to factory settings a/o reset counters, and access other printer default settings.