Canon IP3680 
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 Service Mode  (Service mode operation procedures )

   Use the Service Tool on the connected computer.
* Start the printer in the service mode.
1. With the printer power turned off, while pressing the Resume/Cancel button, press and hold
     the Power button. (DO NOT release the buttons).
2. When the Power LED lights in green, while holding the Power button, release the
     Resume/Cancel button. (DO NOT release the Power button.)
3. While holding the Power button, press the Resume/Cancel button 2 times, and then release
     both the Power and Resume/Cancel buttons. (Each time the Resume/Cancel button is
    pressed, the Alarm and Power LEDs light alternately, Alarm in orange and Power in green,
    starting with Alarm LED.)
4. When the Power LED lights in greens, the printer is ready for the service mode operation:

**  Start the Service Tool on the connected computer, and click the button for a desired function.
1.  During operation of the selected function, all the buttons of the Service Tool are dimmed and
2. When the operation is completed, "A function was finished." is displayed, and another function
    can be selected.
3. If a non-supported function is selected, "Error!" is displayed. Click OK in the error message
    dialog box to exit the error.
get or download service tols files on the printer ip3680-tols