Canon printers like iP1980 has it's common problem like the "ink low" prompt. Most of our customers didn't notice that this problems are having it's solution. Everytime that "ink low" message appears, the solution has been posted on the message prompt to get rid of it. But most of our customers or even you don't notice the solution.
Note: if you got prompted with "ink may run out", please consider of having your cartridge get refilled or buy a new one if you preferred to do so.
See image below:
Most of people who got this problem are confused how to solve this because they only noticed the button on the image; "Cancel Printing" and "About Ink" buttons.
The solution is to press and hold the RESUME button for 5 seconds and ignore the "LOW INK" prompt on it. The "RESUME" button is located at the lower side of the "POWER" button in your printer. For some older printer like Canon Pixma iP1200, iP1300 and other lower version, you will only need to press the resume button once and not 5 seconds.
WARNING:
Please consider of getting your ink cartridges refilled not for a very long period of time from the moment that you got prompted with low ink or ink run out message. You can cause damage on your cartridge if you will continue using it and may lead you to nonrefillable . The ink served as the cooler of the cartridge, it's like water in the engine that if you are not going to be aware, you'll likely damage the engine.
Hope this help.