MAIN Display Screen
The main display screen is your central control panel. If you want to make changes to your keyboard either before or as you play a song, you communicate what you want by using the controls that surround the MAIN display screen. Subsequent lessons will regularly refer to the control buttons around this screen so let's take a look at them right now.
The figure(s) below shows the MAIN display screen for the Tyros5, Tyros4, and Tyros3, the PSR-S940 and the PSR-S910, and the PSR-3000. You will note that the 10 primary control buttons, labeled [A] ... [E] on the left side of the screen and [F] ... [I] on the right side of the screen, are the same on all of the Yamaha keyboards. Similarly, at the bottom of the screen are 16 buttons, in two rows of 8, the top row with an upward facing arrow and the bottom row with a downward facing arrow.
Left and Right Buttons
In the center of the screen, all the models have a table with two columns and 5 rows. The column on the left is associated with the buttons [A] ... [E] and the column on the right with the buttons [F] ... [J].
Button [A] is next to the SONG cell, which is used when you want to play a midi song. On the top right, next to the [F] button is the cell for the first right-hand voice. The table below shows you, model by model, what each side button controls. The SONG cell is always next to the [A] button and the voices Right1, R2 are always next to the [F] and [G] buttons respectively. However, design changes over time have repositioned some of the other regular cells, particularly the STYLE cell. In various illustrations, we may refer to the display screen for the Tyros3 and particular buttons on the left or right. Your particular keyboard, however, may have the referenced cell positioned next to a different button. Bear this in mind as you work through the lessons.
Bottom Buttons (1-8)
Below the display screen are two rows of buttons numbered  ... . These buttons are used to select options shown in the bottom part of the screen below the main table cells. In the illustrations above, the sound BALANCE controls are displayed:
1-SONG, 2- STYLE, 3-MPAD, 4-MIC, 5-LEFT, 6-RIGHT1, 7-RIGHT2, 8-RIGHT3
You can control the relative sound value for these different parts by using the corresponding buttons on the bottom of the screen. There are 8 of these buttons. They depict a volume "slider" that you can move up (by pressing the upper numbered button) or down (by pressing the lower numbered button). For example, to change the sound of the STYLE relative to the right and left voices, you would push the lower and upper  button to move the slider in the desired direction.
On some screens, the bottom area may actually show two rows of information. In these cases, the bottom row is controlled by the bottom numbered buttons and the upper row by the upper numbered buttons. This will be clearer as we look at the different display screens you encounter as you work with your keyboard.
Some display screens may involve multiple major components that are indicated by folder-type tabs at the top of the screen. For example, your keyboard contains internal PRESET styles that are always available. But you may also have some styles stored in a separate USER area within the keyboard, on a USB flash drive, or, if you have a hard drive, on the hard drive itself (HD1). Each of these major storage areas would be represented by a separate tab and you would use the two "TAB" keys located at the top and to the right of the main display. These tab keys, sometimes labeled [PREV] and [NEXT] are used to move from one tab area to the next. Again, you will see many examples of this as you read through these lessons.
An [EXIT] button is located usually on the right and below the main display screen. When you choose options, a new display screen opens where you can make additional choices. Some of these choices may open yet another display screen. The [EXIT] button is used to close the current display screen and move you back to the previous screen. The top screen is the MAIN screen you see pictured above. Pressing [EXIT] repeatedly will always get you back, eventually, to the MAIN screen.
DIRECT ACCESS Button
Note also a button marked [DIRECT ACCESS], usually located on the lower left-hand portion of the controls. You can use this button together with other buttons on the keyboard to immediately jump to a particular option screen. You'll see examples of this in several of the lessons.
Now that you've had a good look at your keyboard top (and back) panels as well as the main screen, it's time to hear some of the sounds that your keyboard can produce. We'll do that in the next lesson when we try out some of the demos included in your keyboard. In working with the demos, you'll also get a good introduction to how those display screen controls work.