There is no resetter for the ImagePrograf 300
After the printer declares the tank to be empty, Simply remove from the printer and refill as per the instruction to refill. When the tanks are replaced into the printer, you will receive a SUPPORT CODE 1699. At this point, you simply press the Lower Round button the right side of the printer for 5 seconds at which point the printer will display processing and continue to work. At this point you wll notice that the ink level for the color affected will be eliminated. Henceforth you will not get bothered about ink etc. for THAT color anymore. You simply continue using the printer and refill when necessary either by using a TALLY counter or by Calendar. This will occur one time for each color.

NOTE TABS BELOW TO ACCESS DIFFERENT SECTIONS
Grey is EMPTY with the RED X
After Refilling the Grey and replacing the tank you are presented with a SUPPORT CODE 1699. DO NOT PANIC!
The SOLUTION is below. PRESS THE LOWER BUTTON for 5 Seconds!
Printer will proceed!
Printing will begin