| 摘要 |
A dot-count calculation section counts the number of dots that are printed, and calculates an amount of toner consumed in a developing device (toner consumption amount). A toner supply amount calculation section calculates an amount of toner supplied to the developing device by the toner supply mechanism (toner supply amount). A cumulative toner supply amount holding section holds a cumulative toner supply amount. A correction toner supply amount calculation section calculates a used amount of the toner in the toner case (correction toner supply amount), based on the toner consumption amount and the toner supply amount. A cumulative toner supply amount updating section adds the correction toner supply amount and the cumulative toner supply amount, and stores a value resulting from the addition in the cumulative toner supply amount holding section, as a new cumulative toner supply amount. |
