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Steps to Put Canon Printers in Service Mode
1- Firstly you need to turn off the printer if the printer power on. Then remove the printer USB cable from your computer.
2- While the printer is OFF, press and hold the Start/Stop button. For sevetral canon printers models it is Resume/Cancel button (press and hold it).
3- While holding Start/Stop button or Resume/Cancel button, press and hold the POWER button in the same time.
4- When the POWER LED (green light) lit, release the Start/Stop or resume/cancel button (while still holding the POWER button).
5- Still holding the power button, Press the Start/Stop button or resume/cancel button TWICE then Release the POWER button. Wait until LCD printer to display 0 (zero) number.
6- Once it is 0, attach the printer USB cable to your computer, it will be detected new device installed (its normal).
You are now completely in Service Mode, so you can continue to make some adjustment, do maintenance, or even reset it using Canon resetter software.