Canon MP490 series On-Screen Manual page 8

(6) Color button
Starts color printing, copying, or scanning.
(7) Alarm lamp
Lights or flashes orange when an error, such as paper-out or ink-out, occurs.
(8) Power lamp
Lights green after flashing when the power is turned on.
(9) Black button
Starts black & white copying or scanning, etc.
(10) Back button
Returns to the previous screen.
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