. OPERATION DETAILED CONTROLS AND GAUGES switch (9) or (The selected monitor is inverted to black.) 3 - 27 Adjusting contrast 2. Use t he b rightness/contras u down switch (10) to select t he contrast monitor. 3. When hanges to contras press up s witch (9) or down switch (10) to adjust the contrast. 4. After completing adjustment confirmation switch (11).