The Troubleshooting section of your Canon manual discusses printer operation with refilled cartridges. Canon advises that "Canon shall not be liable for any printer malfunction or damage caused by refilled ink tanks. If you want to continue printing with the refilled ink tank installed, press and hold the RESUME/CANCEL button for at least 5 seconds, and then release it. Using refilled ink tanks are memorized. * This operation will release the function of detecting the remaining ink level."
*Our iP4200 has been refilled 5 times with no stoppages.
*Installing a new OEM cartridge will reactivate the ink counter for use with the new cartridge.
Refill Instructions Canon
1.Scrape away the thin plastic on top of the cartridge to reveal the ball in the reservoir section.
2.Use our black tool and a small hammer or equivalent device to push the ball into the reservoir. It does not take much, just one sharp blow right on the plastic ball. (See step 9 for alternative.)