This worked a treat for Canon i560
Waste Ink Counter Reset.
(1) Turn off the printer.
(2) Press and hold the RESUME button, then press and hold the POWER button.
(3) Release the RESUME button, Next press and release the RESUME button two(2) more times in succession. Note: you are still holding the POWER button). The printer's carriage will “reset" or move momentarily.
If the above was properly performed the printer will enter the "Service Mode".
(4) Press the RESUME button 4 times, this will select the clear waste ink counter function. The lamp will alternate (change) color with each key press. Next press the POWER button to "set" the change, and return to the top of the function selection menu. Press the POWER button again to restart the printer.