Digital Game Technology DGT 2010 Manuale di riparazione - Pagina 6
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Foto 7 push the middle button
You will see a number that indicates the voltage that is set for "low battery" indication
Foto 8 the "low battery" voltage
Push all buttons one after another once and check if the number in the display changes.
Also switch the lever once or twice.
Put extra attention on the numbers when moving the lever.