Printronix: Printing Darkness
If using wax ribbon, we recommend your darkness is set between 0 and 5.
If using resin ribbon, we recommend your darkness is set between 10 and 15.
Press the green Pause button on your printer to open the main menu.
Press the Enter key, and use the Up and Down arrow keys to adjust the value.
If you see the ENTER SWITCH LOCKED message, just press the Up and Down arrow keys at the same time, and you should then see ENTER SWITCH UNLOCKED.
Press Enter again to apply your settings, then press Pause and then Save Permanently in Active Config.