MAC2000 IntroductionInstruction 2072-0400 71.4 Using the Function KeysThe operation of each function key (F1–F5) depends on the serviceoperation and unit status. The display shows five labels along thebottom of the screen pointing to the function keys below. Each labelshows the action the key will activate. To make a selection, press thefunction key immediately below the arrow.The Next menu function key takes the technician to the next set ofmenu items. There will always be a menu item to take the technicianback to the main menu.1.5 Using the Up/Down, Increase, Decrease, andBack/Forward Arrow KeysPressing the Up/Down and Back/Forward keys moves the cursor onthe screen in that direction. In addition, when entering numeric data,pressing the Increase key will increase the number, while pressingthe Decrease key will decrease the number.