This works for the 4100.
With the printer turned off -
1. Press and hold the Power button
2. When the Canon logo is displayed on the operation panel, while still holding the power button, press Area4 (lower left), Area2 (lower right,) Area3 (upper left,) and Area1 (upper right) and finally release the Power button within two seconds.
When it finishes initializing, there will be an extra menu item, "SERVICE" at the bottom.
I have been looking for the ability to reset maintenance carts but have not found it yet.