Canon PIXMA iP6220D Service Manual page 28

<Button and LCD test procedures>
In the button and LCD test mode, perform the following to confirm the operation of the buttons and the LCD.
1) Press the Stop/Reset button. The LCD color changes and displays a full blue screen.
2) Press each button on the operation panel (except the Power and Stop/Reset buttons). The color of a portion
corresponding to the pressed button changes to red.
For each portion of the display and its corresponding button, see the diagram below. (The diagram is a sample
when the down cursor and print buttons are pressed.)
=== LCD ===
3) When all the buttons excluding the Power and Stop/Reset buttons are pressed, the entire LCD changes to a full
red screen.
4) Open the front cover to display the color pattern.
5) Press the Power button to return to the service mode menu selection.
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