Canon PIXMA MP950 Service Manual page 32

2) Press each button on the operation panel.
The LCD is divided into segments, representing each button. The color of a segment corresponding to the pressed button changes to red.
3) When all the buttons are pressed, the entire LCD changes to a full red screen, and no further pressing of the buttons is accepted.
4) Open the scanning unit (printer cover) to display the color pattern. Only the ON/OFF button is enabled.
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