- Verify that the terminal is properly connected (mains cable or battery for a portable terminal).
- Your terminal is on the initial screen « Bienvenue - EUR.... + OK ».
- Press « menu ».
- Press 2 times on the white button next to the 0 button.
- To reduce the contrast, press 4 several times until the required contrast is obtained.
- To increase the contrast, press 6 several times until the required contrast is obtained.
- When the required contrast has been obtained, press « ok » to confirm.