In most cases there is still toner powder in a cartridge as soon as the electronic counter chip reports it as empty. This is because the chip doesn't really use the actual amount of powder used per printed sheet of paper as a basis for calculation, but in most cases only takes an average value (e.g. 5% coverage) and simply counts the number of printed pages down from a stored value. This means for you: If you exchange the old chip (with an empty page counter) for a new counter chip (with the full range again), you can continue to use the old supposedly empty cartridge until the last bit of toner powder has been printed. You can now continue to print until there is only so little toner powder left in the cartridge that the print quality deteriorates. The advantage for you is that you can de.
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