. OPERATION DETAILED CONTROLS AND GAUGES Back Switch select mode. 3 - 25 Press s witch brightness/contrast adjustment mode, o r select mode. The screen will return to th e previous screen on the monito r display. Up Switch, Down Switc Press up switc h (9) or down switch (10) when i n the maintenance mode, brightness/contras t a djustment mode, or select mode to move the curs are inverted) u or on the p, down monitor , left, or Input Confirmation Switch Press switch (11) to c onfirm brightness/contrast selected adjustment the mode, or